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Cheap flights from St. Louis to London from £193

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 31/1. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LON
8 Feb — 15 Feb1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from St. Louis to London

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to London (LON). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 9 January 2026.

Round-trip from

£486

One-way from

£193

Popular in

June

Cheapest in

November

Average price

£534
United Airlines
  • United Airlines
  • 5/2-12/2
  • 4 total stops
  • 29h 55m total
  • St. Louis to London
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31/1
  • 31/1
  • 3 total stops
  • 44h 49m total
  • St. Louis to London
Search Deals
Highest demand for flights based on searches. 26% potential increase in price (£169 potential increase over avg. return price).
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Cheapest flight prices on average. 5% potential price decrease (£24 potential savings vs. average return price).
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Average for round-trip flights in January 2026
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Find flight deals from St. Louis to London

Enter your travel dates to find the best prices.

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 9 January 2026.

Thu 5/209:57STL - LHR
2 stops14h 43mUnited Airlines
Thu 12/206:50LHR - STL
2 stops15h 12mUnited Airlines
Deal found 8/1£486
Sat 21/216:05STL - LHR
1 stop32h 25mMultiple Airlines
Sat 28/219:30LHR - STL
1 stop24h 25mMultiple Airlines
Deal found 7/1£487
Sat 25/416:05STL - LHR
2 stops22h 55mAir Canada
Mon 11/508:40LHR - STL
2 stops17h 25mAir Canada
Deal found 8/1£488
Thu 5/209:59STL - LHR
2 stops16h 46mDelta
Thu 12/206:20LHR - STL
2 stops16h 25mDelta
Deal found 6/1£489
Fri 6/311:25STL - LHR
1 stop14h 30mUnited Airlines
Fri 13/313:00LHR - STL
1 stop31h 29mUnited Airlines
Deal found 8/1£489
Mon 9/218:57STL - LHR
1 stop10h 43mDelta
Mon 23/210:45LHR - STL
1 stop12h 57mDelta
Deal found 7/1£490
Mon 17/808:55STL - LHR
2 stops15h 35mUnited Airlines
Tue 25/806:30LHR - STL
1 stop12h 55mUnited Airlines
Deal found 7/1£491
Fri 20/316:05STL - LHR
2 stops23h 30mUnited Airlines
Thu 26/318:00LHR - STL
1 stop26h 29mUnited Airlines
Deal found 8/1£492
Thu 23/407:05STL - LHR
1 stop17h 45mBritish Airways
Wed 6/512:15LHR - STL
1 stop12h 12mBritish Airways
Deal found 8/1£492
Sun 12/416:05STL - LHR
1 stop13h 45mMultiple Airlines
Sun 26/407:25LHR - STL
2 stops19h 43mMultiple Airlines
Deal found 8/1£493
Wed 25/211:25STL - LHR
1 stop14h 30mUnited Airlines
Sun 1/312:05LHR - STL
2 stops15h 00mUnited Airlines
Deal found 8/1£494
Sun 3/507:45STL - LHR
2 stops16h 50mUnited Airlines
Wed 13/506:30LHR - STL
1 stop12h 55mUnited Airlines
Deal found 7/1£495

Cheapflights Fare Finder

 
Customise your flight search to find flights from St. Louis to London that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 9 January 2026.
Use the filters below to find and compare flights from St. Louis to London that are best for you.

Fly from

St. Louis

Fly to

London

Route

Depart

Return

Price

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 6/3

06:35-07:05

2 stops18h 30m

London Heathrow

Fri 13/3

06:30-17:53

2 stops16h 23m

£489

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 6/3

11:25-07:55

1 stop14h 30m

London Heathrow

Fri 13/3

13:00-15:29

1 stop31h 29m

£489

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 7/5

07:05-06:50

1 stop17h 45m

London Heathrow

Tue 12/5

12:15-18:27

1 stop12h 12m

£492

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sat 7/3

16:05-20:35

2 stops22h 30m

London Heathrow

Sun 15/3

11:10-15:29

1 stop33h 19m

£492

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 7/5

07:05-06:50

1 stop17h 45m

London Heathrow

Thu 14/5

09:45-16:16

1 stop12h 31m

£492

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 20/3

16:05-20:35

2 stops23h 30m

London Heathrow

Fri 27/3

09:00-15:29

2 stops35h 29m

£492

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 23/4

07:05-06:50

1 stop17h 45m

London Heathrow

Wed 6/5

12:15-18:27

1 stop12h 12m

£492

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 4/2

11:23-08:45

2 stops15h 22m

London Heathrow

Sat 21/2

13:05-23:23

2 stops16h 18m

£493

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 1/2

10:19-06:50

2 stops14h 31m

London Heathrow

Sun 15/2

13:00-23:23

2 stops16h 23m

£493

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 12/3

07:41-06:30

2 stops17h 49m

London Heathrow

Thu 19/3

18:00-15:29

1 stop26h 29m

£495

Flights are sorted by cheapest return flights first.

Deals found on 6/1

Showing 1-10 of 60 results
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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?

Use this chart to determine the optimal time to book a return flight from St. Louis to London. Price data was last updated on 2 January 2026.

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, February is the cheapest month in which you can book a flight from St. Louis to London (average of £367). Flying from St. Louis to London in June is currently the most expensive (average of £744). 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.

How much does it cost for a return flight from St. Louis to London?

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.

Chicago (ORD) – chosen by Cheapflights users on 46% of one-stop itineraries from St. Louis to London on Cheapflights.

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.

Montreal (YUL) is the most affordable one-stop option, with an average return flight price of £549.

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.

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?

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.

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

Reviews of airlines servicing London

Get insights into the airlines that provide service to London. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to London. Reviews last updated 9 January 2026.
Read through reviews of airlines operating flights from St. Louis to London, such as British Airways. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
British Airways
6.7
Okay
7,659 reviews
Check prices

Crew

7.6

Overall

6.7

Food

6.4

Boarding

6.9

Entertainment

6.4

Comfort

6.7

Reviews

1 / 20
8.0
Excellent

Lakshmi,Dec 2025

SFO - LHR

I had a great time on the flight with good entertainment and food. The staff was awesome. The only thing was there was a delay in boarding and takeoff from London. However, I was pleasantly surprised when the airline sent an apology for the few later landing in Mumbai. They did not have WiFi on board on the leg from London to Mumbai but that was okay for me. On the first leg from SF to London, a couple of seats ahead of me had issues with their display so they could not watch anything on their screens although the stewardess gas be them an option to use the WiFi on their devices. This did not affect me, however, so that was cool. I would recommend British Airways. This was my first time flying with them and I had a lovely flight.
British Airways
6.7
Okay
7,659 reviews
British Airways
6.7
Okay
7,659 reviews
Check prices

Crew

7.6

Overall

6.7

Food

6.4

Boarding

6.9

Entertainment

6.4

Comfort

6.7

Reviews

1 / 20
8.0
Excellent

Lakshmi,Dec 2025

SFO - LHR

I had a great time on the flight with good entertainment and food. The staff was awesome. The only thing was there was a delay in boarding and takeoff from London. However, I was pleasantly surprised when the airline sent an apology for the few later landing in Mumbai. They did not have WiFi on board on the leg from London to Mumbai but that was okay for me. On the first leg from SF to London, a couple of seats ahead of me had issues with their display so they could not watch anything on their screens although the stewardess gas be them an option to use the WiFi on their devices. This did not affect me, however, so that was cool. I would recommend British Airways. This was my first time flying with them and I had a lovely flight.

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?

    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 3 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 14h 30m. Delta provides one of the quickest options available for as low as £489. 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?

    Virgin Atlantic, at £409, was found to be the cheapest airline from St. Louis to London.Alternate airlines flying return to your destination include British Airways and Air Canada. Users have found that Virgin Atlantic is 36% cheaper than the other options available to this destination.

  • 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 Stansted, 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, February is the cheapest month in which you can book a flight from St. Louis to London (average of £367). Flying from St. Louis to London in June is currently the most expensive (average of £744). 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

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
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Browse thousands of different options on Cheapflights for your next trip

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Top 3 airlines flying from St. Louis to London

Discover the top 3 airlines that operate flights from St. Louis to London. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 9 January 2026.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£409Average£580FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£431Average£659FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Air CanadaCheapest£435Average£659FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Fly with Cheapflights

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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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