London

$198+ 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 1/18. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LON
Dec 13 — Dec 201
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1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

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3. Compare prices and book

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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 Monday or Thursday and return on a Wednesday

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 November 13, 2025.

This SmartFares deal was found by Cheapflights users on 11/11. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/811:40 amSTL - LHR
2 stops22h 20mScandinavian Airlines
Mon 12/156:40 amLHR - STL
2 stops31h 44mScandinavian Airlines
Deal found 11/11$586
This Kiwi.com deal was found by Cheapflights users on 11/12. 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.
Thu 12/1112:04 pmSTL - LGW
2 stops15h 56mMultiple Airlines
Sun 1/112:10 pmLGW - STL
1 stop23h 40mMultiple Airlines
Deal found 11/12$587
This Kiwi.com deal was found by Cheapflights users on 11/11. 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.
Mon 12/83:30 pmSTL - LGW
1 stop12h 30mMultiple Airlines
Fri 1/92:00 pmLGW - STL
1 stop14h 33mMultiple Airlines
Deal found 11/11$590
This Flightnetwork deal was found by Cheapflights users on 11/12. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/174:05 pmSTL - LHR
2 stops18h 15mMultiple Airlines
Wed 12/36:30 amLHR - STL
1 stop13h 25mMultiple Airlines
Deal found 11/12$602
This Kiwi.com deal was found by Cheapflights users on 11/11. 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.
Fri 12/123:30 pmSTL - LGW
1 stop12h 30mMultiple Airlines
Fri 1/92:00 pmLGW - STL
1 stop14h 33mMultiple Airlines
Deal found 11/11$603
This Kiwi.com deal was found by Cheapflights users on 11/11. 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 12/710:42 amSTL - LGW
2 stops37h 18mMultiple Airlines
Sat 1/102:00 pmLGW - STL
1 stop23h 50mMultiple Airlines
Deal found 11/11$605
This Kiwi.com deal was found by Cheapflights users on 11/11. 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.
Wed 12/107:43 pmSTL - LGW
2 stops32h 17mMultiple Airlines
Sat 1/102:00 pmLGW - STL
1 stop23h 50mMultiple Airlines
Deal found 11/11$609
This Kiwi.com deal was found by Cheapflights users on 11/12. 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 12/710:42 amSTL - LGW
2 stops37h 18mMultiple Airlines
Fri 1/92:00 pmLGW - STL
1 stop14h 33mMultiple Airlines
Deal found 11/12$611
This Kiwi.com deal was found by Cheapflights users on 11/11. 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.
Wed 12/107:43 pmSTL - LGW
2 stops32h 17mMultiple Airlines
Sun 1/112:10 pmLGW - STL
1 stop23h 40mMultiple Airlines
Deal found 11/11$612
This Kiwi.com deal was found by Cheapflights users on 11/12. 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.
Sat 12/133:30 pmSTL - LGW
1 stop12h 35mMultiple Airlines
Sun 1/112:10 pmLGW - STL
1 stop23h 40mMultiple Airlines
Deal found 11/12$613
This Cheapflightsfares deal was found by Cheapflights users on 11/12. 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 11/246:43 pmSTL - LHR
2 stops15h 07mLufthansa
Wed 12/311:10 amLHR - STL
2 stops16h 30mLufthansa
Deal found 11/12$614
This Gotogate deal was found by Cheapflights users on 11/10. 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 11/194:05 pmSTL - LHR
1 stop13h 15mMultiple Airlines
Wed 12/36:30 amLHR - STL
1 stop13h 25mMultiple Airlines
Deal found 11/10$615

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 November 13, 2025.

Most accurate provider

Gotogate
3 stars

Most trusted provider

Gotogate
3 stars

Round-trip from

$586
(SmartFares)

One-way from

$198
(Kiwi.com)

Popular in

June

Cheapest in

November

Average price

$709

Good round-trip deal

$598 or less

Good one-way deal

$418 or less
Provider with most accurate pricing for Lambert-St Louis-London (LON) flight deals.
Provider most trusted by Cheapflights users for Lambert-St Louis-London (LON) flights.
From Lambert-St Louis to London (LON)
One-way flight from Lambert-St Louis to London (LON)
Highest demand for flights based on searches. 22% potential increase in price ($267 potential increase over avg. RT price).
Cheapest flight prices on average. 4% potential price decrease ($40 potential savings vs. average RT price).
Average for round-trip flights in November 2025
Price to beat on a round-trip flight from Lambert-St Louis to London (LON).
Price to beat on a one-way flight from Lambert-St Louis to London (LON).

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 November 13, 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 - LGW

STLLGW

Lambert-St Louis

Thu 12/11

12:04 pm-10:00 am

2 stops15h 56m

London Gatwick

Sun 1/11

2:10 pm-7:50 am

1 stop23h 40m

$587

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Mon 12/8

10:47 am-10:00 am

2 stops17h 13m

London Gatwick

Fri 1/9

2:00 pm-10:33 pm

1 stop14h 33m

$591

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Wed 12/10

7:43 pm-10:00 am

2 stops32h 17m

London Gatwick

Thu 1/8

2:00 pm-10:33 pm

1 stop14h 33m

$623

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 11/24

3:14 pm-7:55 am

1 stop10h 41m

London Heathrow

Wed 12/3

6:30 am-1:55 pm

1 stop13h 25m

$626

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Thu 12/11

12:04 pm-10:00 am

2 stops15h 56m

London Gatwick

Fri 1/9

2:00 pm-10:33 pm

1 stop14h 33m

$626

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Thu 1/15

5:11 pm-6:00 am

2 stops30h 49m

London Gatwick

Thu 1/22

2:00 pm-10:23 am

1 stop26h 23m

$626

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 12/2

11:25 am-5:55 am

1 stop12h 30m

London Heathrow

Tue 12/9

6:50 am-3:40 pm

2 stops14h 50m

$627

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Sun 11/23

3:14 pm-6:00 am

2 stops32h 46m

London Gatwick

Thu 11/27

2:00 pm-11:57 pm

1 stop15h 57m

$628

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 2/11

9:57 am-7:10 am

2 stops15h 13m

London Heathrow

Fri 2/20

6:35 am-5:44 pm

2 stops17h 09m

$634

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 1/7

6:00 am-6:25 am

1 stop18h 25m

London Heathrow

Wed 1/14

6:30 am-4:39 pm

2 stops16h 09m

$635

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/10

Showing 1-10 of 60 results
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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 November.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*3 stars
oojoPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
Thrive TravelPrice Accuracy3 starsTrust Score*1 star
GotogatePrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*2 stars
JustAirTicketPrice Accuracy-Trust Score*1 star

*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 Gotogate to be most consistent on Cheapflights vs. Gotogate Users can find the same prices on St. Louis-London flight deals on Cheapflights vs. Gotogate >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 Gotogate the most. Gotogate 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 November 7, 2025.

The best time to book flights from St. Louis to London is 25 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, September is the cheapest month in which you can book a flight from St. Louis to London (average of $530). Flying from St. Louis to London in June is currently the most expensive (average of $1,001). 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 November 13, 2025.

It’s optimal to fly from St. Louis to London in the evening. By choosing this option you can save up to 30% on the cost of your flight, compared to a flight at noon.

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

Use this chart to determine the cheapest time to fly round-trip from St. Louis to London. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their St. Louis to London flight should consider departing on Friday mornings 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.

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.

Chicago (ORD) – chosen by Cheapflights users on 55% 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 $782.

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 55m.

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 November 13, 2025.
Read reviews from past customers who have flown United Airlines, American Airlines, and Air Canada 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.

Entertainment

7.1

Crew

8.1

Food

6.6

Boarding

7.7

Comfort

7.3

Overall

7.4

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000

Entertainment

7.1

Crew

8.1

Food

6.6

Boarding

7.7

Comfort

7.3

Overall

7.4

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000

Entertainment

7.1

Crew

8.1

Food

6.6

Boarding

7.7

Comfort

7.3

Overall

7.4

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000

Entertainment

7.1

Crew

8.1

Food

6.6

Boarding

7.7

Comfort

7.3

Overall

7.4

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000

Entertainment

7.1

Crew

8.1

Food

6.6

Boarding

7.7

Comfort

7.3

Overall

7.4

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000

Entertainment

7.1

Crew

8.1

Food

6.6

Boarding

7.7

Comfort

7.3

Overall

7.4

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000

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 10 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 10h 41m. United Airlines provides one of the quickest options available for as low as $626. 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), Air Canada ($573), and Delta ($580) offers the cheapest pricing from St. Louis to London. These flights start at 41% lower than the current average price 3 months from now.

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

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

    The cheapest flight price from St. Louis to London is $403. On average you can expect to pay $1,174. The most popular route, (Lambert-St Louis - London Heathrow), can usually be booked for $599.

  • 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, September is the cheapest month in which you can book a flight from St. Louis to London (average of $530). Flying from St. Louis to London in June is currently the most expensive (average of $1,001). 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?

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Top 10 airlines flying from St. Louis to London

Discover the top 10 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 November 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$529Average$745FlexibilityNo cancel feeOn-time75%
Air CanadaCheapest$573Average$929FlexibilityNo cancel feeOn-time67%
DeltaCheapest$580Average$925FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$580Average$886FlexibilityNo cancel feeOn-time69%
British AirwaysCheapest$581Average$886FlexibilityNo cancel feeOn-time70%
IberiaCheapest$597Average$960FlexibilityNo cancel feeOn-time77%
Scandinavian AirlinesCheapest$602Average$1,102FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$636Average$880FlexibilityNo cancel feeOn-time71%
LufthansaCheapest$670Average$888FlexibilityNo cancel feeOn-time76%
Virgin AtlanticCheapest$747Average$947FlexibilityNo cancel feeOn-time72%

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