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Cheap flights from St. Louis to London from £214

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 11/12. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LON
19 Dec — 26 Dec1
1 adult
1 adult, Economy, 0 bags

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

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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 19 November 2025.

Tue 25/1111:05STL - LHR
2 stops15h 25mMultiple Airlines
Tue 2/1219:30LHR - STL
2 stops27h 33mMultiple Airlines
Deal found 18/11£498
Mon 24/1110:45STL - LHR
2 stops15h 20mVirgin Atlantic
Tue 2/1209:40LHR - STL
2 stops18h 17mVirgin Atlantic
Deal found 16/11£502
Wed 19/1112:31STL - LHR
1 stop11h 24mLufthansa
Sun 23/1106:30LHR - STL
1 stop13h 25mLufthansa
Deal found 17/11£503
Wed 19/1112:49STL - LCY
2 stops14h 01mDelta
Wed 26/1110:00LCY - STL
2 stops16h 46mDelta
Deal found 18/11£503
Thu 11/1211:25STL - LHR
1 stop12h 30mUnited Airlines
Fri 19/1206:30LHR - STL
1 stop13h 25mUnited Airlines
Deal found 18/11£511
Wed 19/1112:31STL - LHR
1 stop11h 24mUnited Airlines
Sun 23/1106:50LHR - STL
2 stops16h 49mUnited Airlines
Deal found 18/11£515
Mon 17/1117:31STL - LHR
1 stop11h 34mUnited Airlines
Sun 23/1106:30LHR - STL
1 stop13h 25mUnited Airlines
Deal found 17/11£515
Sun 23/1116:05STL - LHR
2 stops22h 30mUnited Airlines
Sun 7/1206:50LHR - STL
2 stops14h 50mUnited Airlines
Deal found 18/11£516
Mon 24/1118:43STL - LCY
2 stops15h 57mLufthansa
Tue 2/1217:15LCY - STL
2 stops29h 48mLufthansa
Deal found 16/11£519
Tue 25/1113:10STL - LCY
2 stops21h 30mLufthansa
Tue 2/1217:15LCY - STL
2 stops29h 48mLufthansa
Deal found 18/11£519
Wed 19/1109:33STL - LHR
2 stops16h 32mDelta
Sun 23/1106:30LHR - STL
2 stops18h 05mDelta
Deal found 18/11£519
Sun 30/1106:00STL - LHR
1 stop18h 25mDelta
Sun 7/1211:30LHR - STL
2 stops18h 12mDelta
Deal found 18/11£520

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 19 November 2025.

Round-trip from

£492

One-way from

£214

Popular in

June

Cheapest in

November

Average price

£539

Good round-trip deal

£453 or less
Air Canada
  • Air Canada
  • 31/3-9/4
  • 4 total stops
  • 27h 39m total
  • St. Louis to London
Search Deals
11/12
  • 11/12
  • 3 total stops
  • 34h 23m total
  • St. Louis to London
Search Deals
Highest demand for flights based on searches. 23% potential increase in price (£157 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£24 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2025
Search Deals
Price to beat on a round-trip flight from Lambert-St Louis to London (LON).
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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 19 November 2025.
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

Wed 3/12

14:38-11:25

2 stops14h 47m

London Heathrow

Tue 16/12

13:05-23:29

2 stops16h 24m

£503

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 30/11

06:00-06:25

1 stop18h 25m

London Heathrow

Sun 7/12

06:30-16:06

2 stops15h 36m

£515

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Wed 1/4

15:30-18:35

1 stop21h 05m

London City

Tue 7/4

09:15-22:59

2 stops19h 44m

£519

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Fri 16/1

19:27-10:05

2 stops32h 38m

London Gatwick

Mon 19/1

14:00-22:34

1 stop14h 34m

£519

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Wed 8/4

15:30-18:35

1 stop21h 05m

London City

Wed 15/4

09:15-22:59

2 stops19h 44m

£519

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Wed 8/4

08:50-08:50

2 stops18h 00m

London City

Wed 15/4

10:00-23:01

2 stops19h 01m

£520

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Tue 7/4

15:50-16:40

2 stops18h 50m

London City

Wed 15/4

07:45-23:01

2 stops21h 16m

£520

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 12/3

06:30-07:05

1 stop19h 35m

London Heathrow

Tue 17/3

06:30-20:39

2 stops19h 09m

£522

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Wed 3/12

16:05-16:40

2 stops18h 35m

London City

Wed 10/12

09:50-15:29

2 stops35h 39m

£525

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Tue 21/4

11:14-10:55

2 stops17h 41m

London Gatwick

Thu 30/4

11:35-23:24

2 stops41h 49m

£530

Flights are sorted by cheapest return flights first.

Deals found on 16/11

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 14 November 2025.

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, September is the cheapest month in which you can book a flight from St. Louis to London (average of £403). Flying from St. Louis to London in June is currently the most expensive (average of £761). 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?

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 19 November 2025.

It’s optimal to fly from St. Louis to London in the evening. By choosing this option you can save up to 50% on the cost of your flight, compared to a flight in the afternoon.

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 45% 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 £656.

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 19 November 2025.
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
7.7
Good
1,411 reviews
Check prices

Comfort

7.7

Entertainment

7.1

Overall

7.7

Boarding

7.8

Food

7.3

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
KLM
7.7
Good
1,411 reviews
KLM
7.7
Good
1,411 reviews
Check prices

Comfort

7.7

Entertainment

7.1

Overall

7.7

Boarding

7.8

Food

7.3

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
Virgin Atlantic
7.5
Good
673 reviews
KLM
7.7
Good
1,411 reviews
Check prices

Comfort

7.7

Entertainment

7.1

Overall

7.7

Boarding

7.8

Food

7.3

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
British Airways
6.7
Okay
7,528 reviews
KLM
7.7
Good
1,411 reviews
Check prices

Comfort

7.7

Entertainment

7.1

Overall

7.7

Boarding

7.8

Food

7.3

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

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 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 14h 47m. Virgin Atlantic provides one of the quickest options available for as low as £503. 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?

    British Airways, at £440, was found to be the cheapest airline from St. Louis to London.Alternate airlines flying return to your destination include Air Canada and Virgin Atlantic. Users have found that British Airways is 36% 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 Lufthansa (£249), Air Canada (£295), and United Airlines (£379).

  • 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 cheapest flights from St. Louis to London?

    While on average a flight from St. Louis to London is generally £454, our data shows the cheapest flight currently is £440. When looking at the most popular route, (Lambert-St Louis - London Heathrow), you can expect to pay £441 for that flight.

  • 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, September is the cheapest month in which you can book a flight from St. Louis to London (average of £403). Flying from St. Louis to London in June is currently the most expensive (average of £761). 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?

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Top 4 airlines flying from St. Louis to London

Discover the top 4 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 19 November 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£440Average£687FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Air CanadaCheapest£445Average£674FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Virgin AtlanticCheapest£480Average£718FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
KLMCheapest£514Average£815FlexibilityNo cancel feeOn-time75%
Search KLM flights

Fly with Cheapflights

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

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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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