How long is the flight from St. Louis to London?

A quick flight from St. Louis to London can take about 15h 40m. Delta provides one of the quickest options available for as low as £388. The distance between St. Louis and London is about 4186 mi. Both multi-stop and direct flights can be found to your destination and back.

What are the cheapest airlines flying from St. Louis to London round-trip?

Air Canada, at £428, was found to be the cheapest airline from St. Louis to London.Alternate airlines flying return to your destination include Virgin Atlantic and British Airways. Users have found that Air Canada is 37% cheaper than the other options available to this destination.

What are the cheapest airlines to fly from St. Louis to London one-way?

The cheapet airlines for a one-way flight from St. Louis to London are Scandinavian Airlines (£254), United Airlines (£319), and Lufthansa (£321).

What is the cheapest day to fly from St. Louis to London?

Travellers seeking maximum savings on their St. Louis to London flight should consider departing on Wednesday afternoons when fares are most often at their lowest. Friday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

In terms of precipitation, rainfall in London ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London when rainfall is around 40.0 mm.

If weather is an important factor for your trip to London, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

What are the most popular routes from St. Louis to London?

While some choose either Lambert-St Louis - London Gatwick or Lambert-St Louis - London City, Lambert-St Louis - London Heathrow is the most popular route from St. Louis to London.

What are the most popular airlines that fly from St. Louis to London?

Air Canada, British Airways and KLM are the most popular airlines when flying from St. Louis to London.

What airport do you fly from for flights from St. Louis to London?

Most people fly from Lambert-St Louis (STL) if they book a flight from St. Louis to London. On average, Lambert-St Louis has 0 outbound flights to London per day from 4 airlines. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.

Can I find deals for flights from St. Louis to London that include hotel bookings?

Yes. In addition to deals on St. Louis to London flights, Cheapflights offers holiday packages that include both flights and hotel.

How can I find direct flights from St. Louis to London?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to London.

Can I find deals for business class flights from St. Louis to London?

Yes. Cheapflights offers flight deals from St. Louis to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

£169+ Cheap Flights from St. Louis to London

Cheapflights Tip: The best prices from Lambert-St Louis to London are usually found in October or April, booked 81 days in advance, depart on a Wednesday or Saturday and return on a Wednesday

Cheap flight deals from St. Louis to London

Round-trip from	£388
One-way from	£169
Popular in	June
Cheapest in	October
Average price	£596

Delta
14/10-22/10
4 total stops
32h 21m total
St. Louis to London

Search Deals

4/10
2 total stops
32h 15m total
St. Louis to London

Search Deals

Highest demand for flights based on searches. 21% potential increase in price (£134 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease (£21 potential savings vs. average return price).

Search Deals

Average for round-trip flights in September 2025

Search Deals

Find flight deals from St. Louis to London

Cheapest flights from St. Louis to London
Explore the most affordable flight options available from St. Louis to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 18 septiembre 2025.

mar. 14/1010:45STL - LHR

2 stops16h 05mDelta

mié. 22/1006:30LHR - STL

2 stops16h 16mDelta

Deal found 16/9£388

mar. 14/1013:30STL - LHR

1 stop14h 05mUnited Airlines

lun. 20/1017:50LHR - STL

2 stops27h 54mUnited Airlines

Deal found 17/9£389

dom. 28/909:15STL - LHR

2 stops15h 15mAir Canada

mar. 14/1009:30LHR - STL

2 stops16h 13mAir Canada

Deal found 17/9£390

lun. 8/1215:19STL - LHR

2 stops14h 01mUnited Airlines

mar. 16/1208:00LHR - STL

2 stops17h 48mUnited Airlines

Deal found 16/9£398

mar. 11/1116:05STL - LHR

2 stops14h 55mAir Canada

mar. 18/1113:25LHR - STL

2 stops32h 04mAir Canada

Deal found 17/9£404

mié. 19/1112:49STL - LHR

2 stops14h 11mDelta

vie. 5/1206:30LHR - STL

2 stops17h 27mDelta

Deal found 17/9£409

vie. 26/908:05STL - LHR

1 stop16h 50mUnited Airlines

vie. 3/1014:05LHR - STL

2 stops26h 44mUnited Airlines

Deal found 17/9£410

sáb. 11/1013:30STL - LHR

1 stop14h 05mAir Canada

mar. 21/1006:50LHR - STL

2 stops14h 28mAir Canada

Deal found 16/9£413

sáb. 11/1013:30STL - LHR

1 stop14h 05mMultiple Airlines

mar. 21/1006:50LHR - STL

2 stops14h 28mMultiple Airlines

Deal found 17/9£413

sáb. 22/1116:05STL - LHR

1 stop32h 25mUnited Airlines

sáb. 6/1209:00LHR - STL

2 stops18h 40mUnited Airlines

Deal found 16/9£415

mié. 8/1010:45STL - LCY

2 stops14h 30mDelta

mié. 15/1007:45LCY - STL

2 stops15h 01mDelta

Deal found 16/9£427

dom. 14/1209:45STL - LGW

1 stop18h 15mMultiple Airlines

sáb. 10/114:00LGW - STL

1 stop14h 33mMultiple Airlines

Deal found 17/9£459

Best flights from St. Louis to London
Discover carefully curated flight deals from St. Louis to London that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 18 septiembre 2025.

mar. 14/1010:45STL - LHR

2 stops16h 05mDelta

mié. 22/1006:30LHR - STL

2 stops16h 16mDelta

Deal found 16/9£388

mar. 17/310:30STL - LHR

2 stops15h 40mAir Canada

mar. 24/318:00LHR - STL

2 stops25h 18mAir Canada

Deal found 16/9£388

dom. 1/307:41STL - LHR

1 stop16h 14mUnited Airlines

vie. 13/306:30LHR - STL

1 stop13h 25mUnited Airlines

Deal found 18/9£389

mar. 17/316:05STL - LCY

2 stops15h 45mMultiple Airlines

mar. 24/309:50LCY - STL

2 stops34h 39mMultiple Airlines

Deal found 16/9£427

mié. 4/310:45STL - LCY

2 stops16h 05mVirgin Atlantic

dom. 8/317:50LCY - STL

2 stops34h 20mVirgin Atlantic

Deal found 16/9£470

mié. 21/116:05STL - LHR

1 stop10h 25mAir Canada

mar. 27/118:00LHR - STL

1 stop27h 29mAir Canada

Deal found 16/9£389

mar. 14/1013:30STL - LHR

1 stop14h 05mUnited Airlines

lun. 20/1017:50LHR - STL

2 stops27h 54mUnited Airlines

Deal found 17/9£389

lun. 19/111:51STL - LHR

1 stop15h 09mDelta

mié. 28/111:45LHR - STL

2 stops14h 54mDelta

Deal found 16/9£391

mié. 21/116:05STL - LHR

1 stop10h 25mAir Canada

jue. 29/118:00LHR - STL

1 stop27h 29mAir Canada

Deal found 16/9£389

lun. 8/1213:00STL - LHR

1 stop10h 55mUnited Airlines

mar. 16/1210:25LHR - STL

1 stop12h 38mUnited Airlines

Deal found 16/9£390

mié. 21/110:45STL - LHR

1 stop16h 00mDelta

mar. 27/111:45LHR - STL

2 stops14h 54mDelta

Deal found 16/9£391

dom. 14/1209:45STL - LGW

1 stop18h 15mMultiple Airlines

dom. 11/114:10LGW - STL

1 stop23h 40mMultiple Airlines

Deal found 17/9£471

lun. 19/110:00STL - LHR

1 stop15h 50mDelta

mar. 27/111:45LHR - STL

2 stops14h 54mDelta

Deal found 16/9£391

dom. 14/1209:45STL - LGW

1 stop18h 15mMultiple Airlines

lun. 12/114:00LGW - STL

1 stop14h 33mMultiple Airlines

Deal found 17/9£475

mié. 8/1010:45STL - LCY

2 stops14h 30mDelta

mié. 15/1007:45LCY - STL

2 stops15h 01mDelta

Deal found 16/9£427

lun. 15/1209:45STL - LGW

1 stop18h 15mMultiple Airlines

dom. 11/114:10LGW - STL

1 stop23h 40mMultiple Airlines

Deal found 17/9£495

lun. 15/1209:45STL - LGW

1 stop18h 15mMultiple Airlines

lun. 12/114:00LGW - STL

1 stop14h 33mMultiple Airlines

Deal found 17/9£498

jue. 30/1013:30STL - LCY

2 stops12h 45mDelta

lun. 3/1107:45LCY - STL

2 stops16h 17mDelta

Deal found 16/9£500

dom. 14/1209:45STL - LGW

1 stop18h 15mMultiple Airlines

vie. 9/114:00LGW - STL

2 stops29h 53mMultiple Airlines

Deal found 17/9£500

dom. 14/1209:45STL - LGW

1 stop18h 15mMultiple Airlines

jue. 8/114:00LGW - STL

1 stop14h 33mMultiple Airlines

Deal found 17/9£506

mié. 15/1011:10STL - LCY

2 stops15h 00mMultiple Airlines

mar. 21/1008:45LCY - STL

2 stops15h 33mMultiple Airlines

Deal found 16/9£507

lun. 10/1111:49STL - LCY

2 stops19h 01mMultiple Airlines

lun. 24/1117:15LCY - STL

2 stops27h 10mMultiple Airlines

Deal found 16/9£517

dom. 9/1113:10STL - LCY

2 stops17h 40mMultiple Airlines

lun. 24/1117:15LCY - STL

2 stops28h 31mMultiple Airlines

Deal found 16/9£517

vie. 27/207:41STL - LCY

2 stops21h 59mMultiple Airlines

vie. 6/309:55LCY - STL

2 stops18h 11mMultiple Airlines

Deal found 17/9£522

lun. 15/1209:45STL - LGW

1 stop18h 15mMultiple Airlines

jue. 8/114:00LGW - STL

1 stop14h 33mMultiple Airlines

Deal found 17/9£530

dom. 28/913:52STL - LGW

1 stop14h 18mMultiple Airlines

mar. 14/1014:00LGW - STL

2 stops50h 37mMultiple Airlines

Deal found 18/9£534

mié. 10/1217:11STL - LGW

1 stop34h 49mMultiple Airlines

dom. 14/1214:10LGW - STL

1 stop24h 35mMultiple Airlines

Deal found 16/9£535

dom. 9/1114:12STL - LGW

2 stops57h 48mMultiple Airlines

lun. 24/1114:00LGW - STL

1 stop15h 57mMultiple Airlines

Deal found 16/9£539

mié. 15/1013:30STL - STN

3 stops24h 15mMultiple Airlines

mar. 21/1020:00STN - STL

3 stops25h 18mMultiple Airlines

Deal found 16/9£565

dom. 2/1116:05STL - LTN

2 stops17h 00mMultiple Airlines

sáb. 8/1117:55LTN - STL

2 stops26h 00mMultiple Airlines

Deal found 18/9£640

Last-minute flights from St. Louis to London
Discover last-minute flight deals from St. Louis to London. Data last updated 18 septiembre 2025 and is based on user searches.

vie. 26/908:05STL - LHR

1 stop16h 50mUnited Airlines

vie. 3/1014:05LHR - STL

2 stops26h 44mUnited Airlines

Deal found 17/9£410

vie. 26/905:15STL - LHR

1 stop25h 05mMultiple Airlines

vie. 3/1017:40LHR - STL

1 stop27h 38mMultiple Airlines

Deal found 17/9£416

dom. 28/909:15STL - LHR

2 stops15h 15mAir Canada

mar. 14/1009:30LHR - STL

2 stops16h 13mAir Canada

Deal found 17/9£390

dom. 5/1012:25STL - LHR

2 stops16h 15mLufthansa

lun. 13/1020:25LHR - STL

2 stops25h 19mLufthansa

Deal found 17/9£415

mié. 8/1010:45STL - LCY

2 stops14h 30mDelta

mié. 15/1007:45LCY - STL

2 stops15h 01mDelta

Deal found 16/9£427

sáb. 11/1013:30STL - LHR

1 stop14h 05mAir Canada

mar. 21/1006:50LHR - STL

2 stops14h 28mAir Canada

Deal found 16/9£413

sáb. 11/1013:30STL - LHR

1 stop14h 05mMultiple Airlines

mar. 21/1006:50LHR - STL

2 stops14h 28mMultiple Airlines

Deal found 17/9£413

mar. 14/1010:45STL - LHR

2 stops16h 05mDelta

mié. 22/1006:30LHR - STL

2 stops16h 16mDelta

Deal found 16/9£388

mar. 14/1013:30STL - LHR

1 stop14h 05mUnited Airlines

lun. 20/1017:50LHR - STL

2 stops27h 54mUnited Airlines

Deal found 17/9£389

vie. 17/1009:15STL - LHR

1 stop15h 20mMultiple Airlines

mar. 21/1006:50LHR - STL

2 stops14h 28mMultiple Airlines

Deal found 16/9£418

jue. 30/1013:30STL - LCY

2 stops12h 45mDelta

lun. 3/1107:45LCY - STL

2 stops16h 17mDelta

Deal found 16/9£500

vie. 31/1008:20STL - LHR

1 stop18h 10mUnited Airlines

vie. 7/1106:50LHR - STL

2 stops14h 56mUnited Airlines

Deal found 15/9£418

One-way flights from St. Louis to London
Search for one-way flight options from St. Louis to London. Find affordable one-way fares based on user searches. Data last updated 18 septiembre 2025.

sáb. 4/1019:55STL - LGW

2 stops32h 15mMultiple Airlines

Deal found 17/9£169

lun. 8/1209:45STL - LGW

1 stop18h 15mMultiple Airlines

Deal found 16/9£185

lun. 29/921:29STL - LGW

2 stops54h 31mMultiple Airlines

Deal found 17/9£199

lun. 29/919:55STL - LHR

3 stops40h 55mMultiple Airlines

Deal found 17/9£207

mar. 23/919:55STL - LHR

3 stops38h 45mMultiple Airlines

Deal found 16/9£245

jue. 22/112:20STL - LHR

3 stops42h 30mMultiple Airlines

Deal found 16/9£253

lun. 8/1211:40STL - LHR

2 stops24h 50mScandinavian Airlines

Deal found 16/9£254

sáb. 24/114:48STL - LHR

3 stops40h 02mMultiple Airlines

Deal found 16/9£259

mar. 20/117:11STL - LHR

3 stops37h 39mMultiple Airlines

Deal found 16/9£264

vie. 23/119:43STL - LHR

3 stops35h 07mMultiple Airlines

Deal found 16/9£269

mar. 9/1207:00STL - LHR

2 stops23h 50mMultiple Airlines

Deal found 16/9£270

mié. 21/114:55STL - LHR

2 stops39h 55mMultiple Airlines

Deal found 16/9£270

Fly from

Fly to

Route

Depart

Return

Price

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

mar. 14/10

10:45-08:50

2 stops16h 05m

London Heathrow

mié. 22/10

06:30-16:46

2 stops16h 16m

£388

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

mar. 17/3

10:30-07:10

2 stops15h 40m

London Heathrow

mar. 24/3

18:00-14:18

2 stops25h 18m

£388

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

dom. 1/3

07:41-05:55

1 stop16h 14m

London Heathrow

vie. 13/3

06:30-14:55

1 stop13h 25m

£389

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

mié. 21/1

16:05-08:30

1 stop10h 25m

London Heathrow

mar. 27/1

18:00-15:29

1 stop27h 29m

£389

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

mar. 14/10

13:30-09:35

1 stop14h 05m

London Heathrow

lun. 20/10

17:50-15:44

2 stops27h 54m

£389

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

mié. 21/1

16:05-08:30

1 stop10h 25m

London Heathrow

jue. 29/1

18:00-15:29

1 stop27h 29m

£389

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

lun. 8/12

13:00-05:55

1 stop10h 55m

London Heathrow

mar. 16/12

10:25-17:03

1 stop12h 38m

£390

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

lun. 19/1

11:51-09:00

1 stop15h 09m

London Heathrow

mié. 28/1

11:45-20:39

2 stops14h 54m

£391

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

mié. 21/1

10:45-08:45

1 stop16h 00m

London Heathrow

mar. 27/1

11:45-20:39

2 stops14h 54m

£391

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

lun. 19/1

10:00-07:50

1 stop15h 50m

London Heathrow

mar. 27/1

11:45-20:39

2 stops14h 54m

£391

Flights are sorted by cheapest return flights first.

Deals found on 17/9

Showing 1-10 of 60 results

...

Best time to book a flight from St. Louis to London

Have a flexible travel schedule? Discover the best time to fly to London from St. Louis with our price prediction graph.

Estimated return price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to London

How far ahead should I book a flight from St. Louis to London?

Booking 25 days in advance of your planned departure date is, on average, the best time to get cheap flights from St. Louis to London. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from St. Louis to London?

Currently, January is the cheapest month in which you can book a flight from St. Louis to London (average of £112). Flying from St. Louis to London in August is currently the most expensive (average of £164). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from STL to LON?

It’s optimal to fly from St. Louis to London in the morning. By choosing this option you can save up to 45% on the cost of your flight, compared to a flight in the evening.

What’s the top stopover airport for flights from St. Louis to London?

Chicago (ORD) – chosen by Cheapflights users on 42% of one-stop itineraries from St. Louis to London on Cheapflights.

What’s the cheapest stopover airport for flights from St. Louis to London?

Montreal (YUL) is the most affordable one-stop option, with an average return flight price of £633.

What’s the fastest stopover option from St. Louis to London?

Flights via Chicago (ORD) have the shortest average one-way travel time for one-stop routes: 10h 10m.

Which airport typically offers the quickest stopover for flights from St. Louis to London?

Flights via Chicago (ORD) offer the fastest connection on this route, with an average stopover time of 1h 30m.

Reviews of airlines servicing London

Read through reviews of airlines operating flights from St. Louis to London, such as KLM, Virgin Atlantic, andBritish Airways. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

KLM

7.8

Good

1,386 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mark,Sept 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

KLM

7.8

Good

1,386 reviews

KLM

7.8

Good

1,386 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mark,Sept 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

Virgin Atlantic

7.4

Good

664 reviews

KLM

7.8

Good

1,386 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mark,Sept 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

British Airways

6.7

Okay

7,367 reviews

KLM

7.8

Good

1,386 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mark,Sept 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

Related info for your journey

What airport do you fly from for flights from St. Louis to London?
Most people fly from Lambert-St Louis (STL) if they book a flight from St. Louis to London. On average, Lambert-St Louis has 0 outbound flights to London per day from 4 airlines. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.
How long is the flight from St. Louis to London?
A quick flight from St. Louis to London can take about 15h 40m. Delta provides one of the quickest options available for as low as £388. The distance between St. Louis and London is about 4186 mi. Both multi-stop and direct flights can be found to your destination and back.
What are the cheapest airlines flying from St. Louis to London round-trip?
Air Canada, at £428, was found to be the cheapest airline from St. Louis to London.Alternate airlines flying return to your destination include Virgin Atlantic and British Airways. Users have found that Air Canada is 37% cheaper than the other options available to this destination.
What are the cheapest airlines to fly from St. Louis to London one-way?
The cheapet airlines for a one-way flight from St. Louis to London are Scandinavian Airlines (£254), United Airlines (£319), and Lufthansa (£321).
What are the most popular routes from St. Louis to London?
While some choose either Lambert-St Louis - London Gatwick or Lambert-St Louis - London City, Lambert-St Louis - London Heathrow is the most popular route from St. Louis to London.
Can I find deals for flights from St. Louis to London that include hotel bookings?
Yes. In addition to deals on St. Louis to London flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from St. Louis to London?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to London.
Can I find deals for business class flights from St. Louis to London?
Yes. Cheapflights offers flight deals from St. Louis to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from St. Louis to London?
Currently, January is the cheapest month in which you can book a flight from St. Louis to London (average of £112). Flying from St. Louis to London in August is currently the most expensive (average of £164). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Milton Keynes

Croydon

Hounslow

Slough

Gatwick

Luton

Deal

Wembley

Ilford

Crawley

Hayes

Watford

Winchester

Chichester

Ipswich

Dartford

Guildford

Brentford

Bishop's Stortford

Romford

Browse thousands of different options on Cheapflights for your next trip

Top 4 airlines flying from St. Louis to London

Airline	Cheapest	Average	Flexibility	On-time
Air Canada	Cheapest£428	Average£638	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
Virgin Atlantic	Cheapest£462	Average£747	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
British Airways	Cheapest£483	Average£689	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
KLM	Cheapest£521	Average£785	FlexibilityNo cancel fee	On-time75%	Search KLM flights

Fly with Cheapflights

How does Cheapflights help users find flights from St. Louis to London?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from St. Louis to London. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from St. Louis to London?

Millions of users choose and trust Cheapflights to book the best flight deals from St. Louis to London for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from St. Louis to London with no change fees?

Yes! Cheapflights helps users easily find flights from St. Louis to London with no change fees.

Can Cheapflights notify me if prices for flights from St. Louis to London become cheaper?

Yes! Start tracking prices for St. Louis to London flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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Cheap flights from St. Louis to London from £169

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/10. Fares are subject to change and may not be available on all flights or dates of travel.

Cheapflights Tip: The best prices from Lambert-St Louis to London are usually found in October or April, booked 81 days in advance, depart on a Wednesday or Saturday and return on a Wednesday

Cheap flight deals from St. Louis to London

Round-trip from

One-way from

Popular in

Cheapest in

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Cheapest flights from St. Louis to LondonExplore the most affordable flight options available from St. Louis to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 18 septiembre 2025.

Explore the most affordable flight options available from St. Louis to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 18 septiembre 2025.

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Best time to book a flight from St. Louis to London

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Everything you need to know about your flight from St. Louis to London

How far ahead should I book a flight from St. Louis to London?

Use this chart to determine the optimal time to book a return flight from St. Louis to London. Price data was last updated on 12 September 2025.

What is the cheapest month to book a flight from St. Louis to London?

What is the cheapest time of day to fly from STL to LON?

Find hourly flight availability from St. Louis to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 18 septiembre 2025.

What’s the top stopover airport for flights from St. Louis to London?

Share of one-stop return flights from St. Louis to London chosen by Cheapflights users in the past 12 months, using the same stopover each way.

What’s the cheapest stopover airport for flights from St. Louis to London?

Average return fare for one-stop flights from St. Louis to London, chosen by Cheapflights users in the past 12 months, with the same stopover each way.

What’s the fastest stopover option from St. Louis to London?

Shortest average travel time for one-stop one-way flights from St. Louis to London, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.

Which airport typically offers the quickest stopover for flights from St. Louis to London?

Average stopover duration for one-stop one-way flights from St. Louis to London, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Reviews of airlines servicing London

Read through reviews of airlines operating flights from St. Louis to London, such as KLM, Virgin Atlantic, andBritish Airways. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to London. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What airport do you fly from for flights from St. Louis to London?

How long is the flight from St. Louis to London?

What are the cheapest airlines flying from St. Louis to London round-trip?

What are the cheapest airlines to fly from St. Louis to London one-way?

What are the most popular routes from St. Louis to London?

Can I find deals for flights from St. Louis to London that include hotel bookings?

How can I find direct flights from St. Louis to London?

Can I find deals for business class flights from St. Louis to London?

What is the cheapest month to book a flight from St. Louis to London?

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Alternative routes for St. Louis to London

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Top 4 airlines flying from St. Louis to London

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Cheapest flights from St. Louis to London
Explore the most affordable flight options available from St. Louis to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 18 septiembre 2025.