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$277+ 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 9/14. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LON
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to London are usually found in October or April, booked 73 days in advance, depart on a Wednesday or Thursday and return on a Wednesday

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 July 29, 2025.

Round-trip from

$552
(oojo)

One-way from

$277
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$1,210
From Lambert-St Louis to London (LON)
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One-way flight from Lambert-St Louis to London (LON)
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Highest demand for flights based on searches. 20% potential increase in price ($246 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($38 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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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 July 29, 2025.

This oojo deal was found by Cheapflights users on 7/28. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/241:15 pmSTL - LHR
2 stops17h 00mBritish Airways
Fri 9/57:00 amLHR - STL
2 stops20h 06mBritish Airways
Deal found 7/28$552
This Mytrip deal was found by Cheapflights users on 7/28. 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.
Mon 8/251:30 pmSTL - LTN
2 stops20h 30mMultiple Airlines
Mon 9/19:55 pmLTN - STL
3 stops27h 43mMultiple Airlines
Deal found 7/28$554
This Gotogate deal was found by Cheapflights users on 7/28. 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 9/94:05 pmSTL - LHR
1 stop13h 45mMultiple Airlines
Mon 9/227:30 pmLHR - STL
2 stops26h 14mMultiple Airlines
Deal found 7/28$557
This Iberia deal was found by Cheapflights users on 7/26. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/242:15 pmSTL - LHR
1 stop11h 05mIberia
Fri 10/3111:25 amLHR - STL
2 stops26h 39mIberia
Deal found 7/26$561
This Mytrip deal was found by Cheapflights users on 7/28. 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.
Mon 8/254:00 pmSTL - STN
2 stops18h 05mMultiple Airlines
Mon 9/110:00 pmSTN - STL
3 stops27h 38mMultiple Airlines
Deal found 7/28$562
This United Airlines deal was found by Cheapflights users on 7/29. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/105:15 amSTL - LHR
1 stop25h 05mUnited Airlines
Mon 9/223:50 pmLHR - STL
1 stop29h 28mUnited Airlines
Deal found 7/29$565
This oojo deal was found by Cheapflights users on 7/27. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/1012:28 pmSTL - LCY
2 stops22h 02mBritish Airways
Wed 9/177:00 amLCY - STL
2 stops20h 06mBritish Airways
Deal found 7/27$572
This Air Canada deal was found by Cheapflights users on 7/29. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/201:30 pmSTL - LHR
1 stop11h 00mAir Canada
Sat 8/309:30 amLHR - STL
2 stops16h 15mAir Canada
Deal found 7/29$572
This Delta deal was found by Cheapflights users on 7/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/91:26 pmSTL - LHR
1 stop11h 19mDelta
Mon 9/226:15 amLHR - STL
2 stops16h 22mDelta
Deal found 7/29$574
This Mytrip deal was found by Cheapflights users on 7/28. 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.
Mon 8/254:00 pmSTL - LGW
2 stops14h 45mMultiple Airlines
Mon 9/18:40 pmLGW - STL
2 stops29h 17mMultiple Airlines
Deal found 7/28$601
This Cheapflightsfares deal was found by Cheapflights users on 7/26. 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 10/145:28 pmSTL - LCY
2 stops16h 57mLufthansa
Wed 10/228:45 amLCY - STL
2 stops21h 12mLufthansa
Deal found 7/26$622
This Expedia deal was found by Cheapflights users on 7/27. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/48:01 pmSTL - LGW
2 stops32h 49mIberia
Tue 9/28:40 pmLGW - STL
2 stops29h 52mIberia
Deal found 7/27$631

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 July 29, 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

Sun 8/24

1:15 pm-12:15 pm

2 stops17h 00m

London Heathrow

Fri 9/5

7:00 am-9:06 pm

2 stops20h 06m

$552

St. LouisLondon

STL - LTN

STLLTN

Lambert-St Louis

Mon 8/25

1:30 pm-4:00 pm

2 stops20h 30m

London Luton

Mon 9/1

9:55 pm-7:38 pm

3 stops27h 43m

$554

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 9/9

4:05 pm-11:50 am

1 stop13h 45m

London Heathrow

Mon 9/22

7:30 pm-3:44 pm

2 stops26h 14m

$557

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 10/24

2:15 pm-7:20 am

1 stop11h 05m

London Heathrow

Fri 10/31

11:25 am-9:04 am

2 stops26h 39m

$561

St. LouisLondon

STL - STN

STLSTN

Lambert-St Louis

Mon 8/25

4:00 pm-4:05 pm

2 stops18h 05m

London Stansted

Mon 9/1

10:00 pm-7:38 pm

3 stops27h 38m

$562

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 9/10

5:15 am-12:20 pm

1 stop25h 05m

London Heathrow

Mon 9/22

3:50 pm-3:18 pm

1 stop29h 28m

$565

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 8/20

1:30 pm-6:30 am

1 stop11h 00m

London Heathrow

Sat 8/30

9:30 am-7:45 pm

2 stops16h 15m

$572

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Wed 9/10

12:28 pm-4:30 pm

2 stops22h 02m

London City

Wed 9/17

7:00 am-9:06 pm

2 stops20h 06m

$572

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 9/9

1:26 pm-6:45 am

1 stop11h 19m

London Heathrow

Mon 9/22

6:15 am-4:37 pm

2 stops16h 22m

$574

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 8/19

5:30 pm-8:40 pm

2 stops21h 10m

London Heathrow

Wed 8/27

6:30 am-3:44 pm

2 stops15h 14m

$599

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Showing 1-10 of 33 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 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 July 25, 2025.

The best time to book flights from St. Louis to London is 73 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, November is the cheapest month in which you can book a flight from St. Louis to London (average of $661). Flying from St. Louis to London in June is currently the most expensive (average of $1,097). 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 July 29, 2025.

It’s optimal to fly from St. Louis to London in the morning. By choosing this option you can save up to 5% on the cost of your flight, compared to a flight at noon.

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 62% 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 $730.

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 Frankfurt am Main (FRA) have the shortest average one-way travel time for 1-stop routes: 3h 15m.

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 31m.

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 July 29, 2025.
Read reviews from past customers who have flown Delta, United Airlines, and Turkish 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
8.0
Very good
7,979 reviews

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.3

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,979 reviews
Delta
8.0
Very good
7,979 reviews

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.3

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,896 reviews
Delta
8.0
Very good
7,979 reviews

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.3

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Turkish Airlines
7.3
Good
3,925 reviews
Delta
8.0
Very good
7,979 reviews

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.3

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,979 reviews

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.3

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Air Canada
7.1
Good
9,826 reviews
Delta
8.0
Very good
7,979 reviews

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.3

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection 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?

    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.

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

    According to our current data, British Airways ($552), Iberia ($561), and United Airlines ($565) offers the cheapest pricing from St. Louis to London. These flights start at 40% 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 United Airlines, with whom users have recently found tickets for as low as $394. However, be on the lookout for offers from Air Canada and Lufthansa, 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 City.

  • 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, November is the cheapest month in which you can book a flight from St. Louis to London (average of $661). Flying from St. Louis to London in June is currently the most expensive (average of $1,097). 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
Hounslow
Hayes
Thornton Heath
Harrow
Canterbury
Dover
Orpington
Watford
Gatwick
Borehamwood
Dartford
Aylesbury
Chelmsford
Folkestone
Southend-on-Sea
Chichester
Arundel
Milton Keynes
Bishop's Stortford
Eastbourne

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Alternative routes for St. Louis to London

See prices for flight routes from nearby airports that may be better suited for you.
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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 July 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$529Average$745FlexibilityNo cancel feeOn-time75%
British AirwaysCheapest$664Average$937FlexibilityNo cancel feeOn-time70%
Scandinavian AirlinesCheapest$669Average$1,102FlexibilityNo cancel feeOn-time77%
IberiaCheapest$669Average$972FlexibilityNo cancel feeOn-time77%
Air CanadaCheapest$678Average$952FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$686Average$915FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$692Average$947FlexibilityNo cancel feeOn-time69%
DeltaCheapest$692Average$976FlexibilityNo cancel feeOn-timeN/A
Virgin AtlanticCheapest$703Average$913FlexibilityNo cancel feeOn-time72%
LufthansaCheapest$725Average$1,085FlexibilityNo cancel feeOn-time76%

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