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$292+ Cheap flights from St. Louis (STL) to London (LON)

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 4/19. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LON
Apr 16 — Apr 231
Thu 4/16
Thu 4/23
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to London are usually found in January or October, booked 12 days in advance, depart on a Monday or Thursday and return on a Monday

Cheap 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 March 17, 2026.

This Mytrip deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/144:05 pm
STL
-
STN
2 stops21h 30m
Multiple Airlines
Tue 4/2110:00 pm
STN
-
STL
2 stops23h 25m
Multiple Airlines
Deal found 3/15$708
This Mytrip deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/144:05 pm
STL
-
LGW
2 stops23h 10m
Multiple Airlines
Tue 4/218:35 pm
LGW
-
STL
2 stops24h 50m
Multiple Airlines
Deal found 3/15$714
This Gotogate deal was found by Cheapflights users on 3/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/31:00 pm
STL
-
LHR
1 stop15h 00m
Air Canada
Tue 5/126:50 am
LHR
-
STL
2 stops19h 35m
Air Canada
Deal found 3/16$720
This Gotogate deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/294:05 pm
STL
-
LHR
1 stop13h 45m
Air Canada
Wed 5/68:40 am
LHR
-
STL
2 stops17h 45m
Air Canada
Deal found 3/15$738
This Gotogate deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/284:05 pm
STL
-
LHR
1 stop13h 45m
Air Canada
Tue 5/55:15 pm
LHR
-
STL
2 stops33h 10m
Air Canada
Deal found 3/14$739
This Cheapflightsfares deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/56:49 pm
STL
-
LHR
2 stops17h 36m
Lufthansa
Fri 10/166:30 am
LHR
-
STL
1 stop12h 55m
Lufthansa
Deal found 3/15$740
This FlightHub deal was found by Cheapflights users on 3/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/53:42 pm
STL
-
LHR
2 stops18h 18m
Scandinavian Airlines
Fri 10/166:40 am
LHR
-
STL
2 stops22h 59m
Scandinavian Airlines
Deal found 3/17$742
This Gotogate deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/284:05 pm
STL
-
LHR
1 stop10h 30m
Multiple Airlines
Wed 5/208:40 am
LHR
-
STL
2 stops17h 45m
Multiple Airlines
Deal found 3/14$743
This FlightHub deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/53:42 pm
STL
-
LHR
2 stops19h 58m
Scandinavian Airlines
Sat 10/246:40 am
LHR
-
STL
2 stops22h 59m
Scandinavian Airlines
Deal found 3/15$744
This Kiwi.com deal was found by Cheapflights users on 3/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/194:59 pm
STL
-
LGW
1 stop35h 01m
Multiple Airlines
Wed 4/292:00 pm
LGW
-
STL
2 stops26h 26m
Multiple Airlines
Deal found 3/16$744
This Cheapflightsfares deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/63:30 pm
STL
-
LHR
1 stop17h 10m
Lufthansa
Fri 10/166:30 am
LHR
-
STL
1 stop12h 55m
Lufthansa
Deal found 3/15$746
This Cheapflightsfares deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/83:30 pm
STL
-
LHR
1 stop13h 10m
Lufthansa
Wed 9/166:30 am
LHR
-
STL
1 stop12h 55m
Lufthansa
Deal found 3/13$747

Find 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 March 17, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$708
(Mytrip)

One-way from

$292
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$753

Good round-trip deal

$864 or less

Good one-way deal

$535 or less
Provider with most accurate pricing for Lambert-St Louis-London (LON) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-London (LON) flights.
Search Deals
From Lambert-St Louis to London (LON)
Search Deals
One-way flight from Lambert-St Louis to London (LON)
Search Deals
Highest demand for flights based on searches. 26% potential increase in price ($299 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($43 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals
Price to beat on a round-trip flight from Lambert-St Louis to London (LON).
Search Deals
Price to beat on a one-way flight from Lambert-St Louis to London (LON).
Search Deals

Cheapflights Fare Finder

 
Customize 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 2,558,603 searches. Data last updated March 17, 2026.
Use the filters below to find and compare flights from St. Louis to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 3/30

12:04 pm-1:15 pm

1 stop19h 11m

London Heathrow

Tue 4/14

11:45 am-11:36 pm

2 stops17h 51m

$774

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 4/13

6:05 pm-9:40 am

1 stop33h 35m

London Heathrow

Tue 4/28

5:40 pm-3:25 pm

1 stop27h 45m

$788

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 3/30

6:05 pm-9:40 am

1 stop33h 35m

London Heathrow

Tue 4/14

5:40 pm-3:25 pm

1 stop27h 45m

$788

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Wed 8/19

2:18 pm-9:30 am

2 stops13h 12m

London City

Fri 8/28

10:00 am-8:50 pm

2 stops16h 50m

$807

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Wed 4/22

1:46 pm-8:50 am

2 stops37h 04m

London City

Wed 4/29

9:20 am-11:13 pm

2 stops19h 53m

$807

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Wed 4/22

1:46 pm-8:50 am

2 stops37h 04m

London City

Fri 5/1

10:00 am-11:13 pm

2 stops19h 13m

$807

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Wed 4/22

5:59 pm-8:50 am

2 stops32h 51m

London City

Mon 4/27

8:25 am-2:29 pm

2 stops36h 04m

$807

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Wed 4/22

10:50 am-8:50 am

2 stops40h 00m

London City

Tue 4/28

10:00 am-5:44 pm

2 stops37h 44m

$807

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 4/13

10:50 am-8:50 am

2 stops16h 00m

London Heathrow

Tue 4/28

11:45 am-11:36 pm

2 stops17h 51m

$826

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Mon 3/30

6:35 pm-5:55 pm

2 stops17h 20m

London City

Fri 4/10

9:15 am-11:11 pm

2 stops19h 56m

$835

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/14

Showing 1-10 of 60 resultsSorted by cheapest first
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Compare providers for flights from St. Louis to London

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to London in March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
oojoPrice Accuracy3 starsTrust Score*3 stars
Trip.comPrice Accuracy1 starTrust Score*3 stars
Justfly.comPrice Accuracy3 starsTrust Score*3 stars
GurufarePrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on St. Louis-London flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-London flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-London flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-London flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-London flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 round-trip 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 round-trip flight from St. Louis to London. Price data was last updated on March 13, 2026.

The best time to book flights from St. Louis to London is 12 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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 $526). Flying from St. Louis to London in June is currently the most expensive (average of $1,021). 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 to fly round-trip from St. Louis to London?

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

Share of 1-stop round-trip flights from St. Louis to London chosen by Cheapflights users in the past 12 months, using the same layover each way.

Montreal (YUL) – chosen by Cheapflights users on 67% of 1-stop itineraries from St. Louis to London on Cheapflights.

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

Average round-trip fare for 1-stop flights from St. Louis to London, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Chicago (ORD) is the most affordable 1-stop option, with an average round-trip price of $808.

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

Shortest average travel time for 1-stop one-way flights from St. Louis to London, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Chicago (ORD) have the shortest average one-way travel time for 1-stop routes: 9h 43m.

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

Average layover duration for 1-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 layover time of 1h 16m.

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 March 17, 2026.
Read reviews from past customers who have flown Delta,United Airlines, andAmerican Airlines from St. Louis to London. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,288 reviews

Crew

8.5

Food

7.2

Entertainment

7.8

Comfort

7.9

Overall

7.9

Boarding

8.1

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,288 reviews
Delta
7.9
Good
8,288 reviews

Crew

8.5

Food

7.2

Entertainment

7.8

Comfort

7.9

Overall

7.9

Boarding

8.1

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
United Airlines
7.4
Good
9,432 reviews
Delta
7.9
Good
8,288 reviews

Crew

8.5

Food

7.2

Entertainment

7.8

Comfort

7.9

Overall

7.9

Boarding

8.1

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
American Airlines
7.1
Good
11,467 reviews
Delta
7.9
Good
8,288 reviews

Crew

8.5

Food

7.2

Entertainment

7.8

Comfort

7.9

Overall

7.9

Boarding

8.1

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Air Canada
7.1
Good
10,811 reviews
Delta
7.9
Good
8,288 reviews

Crew

8.5

Food

7.2

Entertainment

7.8

Comfort

7.9

Overall

7.9

Boarding

8.1

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
British Airways
6.7
Okay
7,799 reviews
Delta
7.9
Good
8,288 reviews

Crew

8.5

Food

7.2

Entertainment

7.8

Comfort

7.9

Overall

7.9

Boarding

8.1

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

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?

    Lambert-St Louis (STL) is the airport you will fly out of if you book a flight from St. Louis to London. You should not have trouble finding flights to London from Lambert-St Louis; the airport handles an average of 0 outbound flights to London per day. You should also have plenty of airline options to choose from since 8 airlines have flights from the St. Louis airport to London. It is only a 12.7 mi journey to Lambert-St Louis (STL) 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 19h 11m. Delta provides one of the quickest options available for as low as $774. St. Louis and London are separated by a distance of 4186 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    According to our current data, KLM ($529), British Airways ($538), and American Airlines ($563) offers the cheapest pricing from St. Louis to London. These flights start at 38% lower than the current average price 3 months from now.

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

    The cheapest airline one-way is British Airways, with whom users have recently found tickets for as low as $397. However, be on the lookout for offers from Iberia and Delta, as they are both options that can get you from St. Louis to London for a low price.

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

    The most popular flight routes from St. Louis to London are Lambert-St Louis - London Heathrow, Lambert-St Louis - London Gatwick and Lambert-St Louis - London Stansted.

  • What are the cheapest flights from St. Louis to London?

    The cheapest flight price from St. Louis to London is $287. On average you can expect to pay $1,562. The most popular route, (Lambert-St Louis - London Heathrow), can usually be booked for $740.

  • 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 vacation 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 $526). Flying from St. Louis to London in June is currently the most expensive (average of $1,021). 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

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Ilford
Hounslow
Croydon
Gatwick
Southend-on-Sea
Harrow
Eastleigh
Dartford
Dover
Winchester
Orpington
Watford
Borehamwood
Aylesbury
Chipping Norton
Hayes
Kingston upon Thames
Eastbourne
Sutton
Slough

Browse thousands of different options on Cheapflights for your next trip

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Top 8 airlines flying from St. Louis to London

Discover the top 8 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 2,558,603 searches. Data last updated March 17, 2026.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$529Average$643FlexibilityNo cancel feeOn-time75%
British AirwaysCheapest$538Average$800FlexibilityNo cancel feeOn-time70%
American AirlinesCheapest$563Average$873FlexibilityNo cancel feeOn-time71%
Air CanadaCheapest$572Average$932FlexibilityNo cancel feeOn-time67%
DeltaCheapest$577Average$852FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$580Average$898FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$580Average$844FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$635Average$888FlexibilityNo cancel feeOn-time76%

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