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$226+ 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 7/14. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LON
Jul 19 — Jul 261
Sun 7/19
Sun 7/26
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to London are usually found in October or November, booked 47 days in advance, depart on a Thursday or Monday and return on a Wednesday

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 June 19, 2026.

This Mytrip deal was found by Cheapflights users on 6/15. 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.
Wed 7/228:55 am
STL
-
LGW
2 stops27h 00m
Multiple Airlines
Tue 7/284:50 pm
LGW
-
STL
2 stops26h 35m
Multiple Airlines
Deal found 6/15$1,071
This Mytrip deal was found by Cheapflights users on 6/16. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/213:30 pm
STL
-
STN
2 stops25h 20m
Multiple Airlines
Wed 9/306:15 am
STN
-
STL
2 stops19h 45m
Multiple Airlines
Deal found 6/16$1,071
This Air Canada deal was found by Cheapflights users on 6/16. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/48:55 am
STL
-
LHR
2 stops15h 35m
Multiple Airlines
Sat 9/1212:40 pm
LHR
-
STL
2 stops14h 50m
Multiple Airlines
Deal found 6/16$1,072
This Mytrip deal was found by Cheapflights users on 6/14. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/1912:10 pm
STL
-
LGW
2 stops26h 45m
Multiple Airlines
Wed 7/2910:00 pm
LGW
-
STL
2 stops26h 42m
Multiple Airlines
Deal found 6/14$1,072
This Cheapflightsfares deal was found by Cheapflights users on 6/14. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2112:20 pm
STL
-
LCY
2 stops23h 35m
Lufthansa
Wed 10/289:50 am
LCY
-
STL
2 stops19h 44m
Lufthansa
Deal found 6/14$1,073
This United Airlines deal was found by Cheapflights users on 6/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/286:54 pm
STL
-
LHR
1 stop11h 01m
United Airlines
Thu 9/311:05 am
LHR
-
STL
1 stop12h 01m
United Airlines
Deal found 6/14$1,073
This Kiwi.com deal was found by Cheapflights users on 6/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/196:34 pm
STL
-
LGW
2 stops33h 26m
Multiple Airlines
Sun 8/22:00 pm
LGW
-
STL
1 stop15h 59m
Multiple Airlines
Deal found 6/14$1,073
This Air Canada deal was found by Cheapflights users on 6/14. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/2812:10 pm
STL
-
LHR
1 stop12h 20m
Air Canada
Wed 9/29:30 am
LHR
-
STL
1 stop15h 12m
Air Canada
Deal found 6/14$1,074
This Mytrip deal was found by Cheapflights users on 6/14. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/2812:10 pm
STL
-
LTN
2 stops23h 15m
Multiple Airlines
Mon 9/78:15 am
LTN
-
STL
2 stops35h 10m
Multiple Airlines
Deal found 6/14$1,074
This Iberia deal was found by Cheapflights users on 6/15. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/289:35 pm
STL
-
LHR
Nonstop8h 00m
Iberia
Tue 9/81:45 pm
LHR
-
STL
1 stop15h 49m
Iberia
Deal found 6/15$1,075
This Kiwi.com deal was found by Cheapflights users on 6/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/14:17 pm
STL
-
LGW
1 stop35h 43m
Multiple Airlines
Thu 10/152:00 pm
LGW
-
STL
2 stops33h 46m
Multiple Airlines
Deal found 6/15$1,075
This Mytrip deal was found by Cheapflights users on 6/15. 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.
Sun 7/2612:10 pm
STL
-
LGW
3 stops25h 50m
Multiple Airlines
Tue 8/49:35 pm
LGW
-
STL
2 stops22h 27m
Multiple Airlines
Deal found 6/15$1,077

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 June 19, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,071
(Mytrip)

One-way from

$244
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$1,399

Good round-trip deal

$1,071 or less

Good one-way deal

$374 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. 28% potential increase in price ($344 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($48 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 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 June 19, 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 - LTN

STLLTN

Lambert-St Louis

Thu 7/16

8:55 am-7:55 pm

3 stops29h 00m

London Luton

Thu 7/23

3:40 pm-1:25 pm

2 stops27h 45m

$1,082

St. LouisLondon

STL - LTN

STLLTN

Lambert-St Louis

Wed 7/29

2:40 pm-12:50 pm

3 stops16h 10m

London Luton

Wed 8/5

6:00 am-6:42 pm

2 stops18h 42m

$1,088

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Mon 8/31

8:55 am-2:20 pm

3 stops23h 25m

London Gatwick

Mon 9/7

6:40 pm-1:25 pm

2 stops24h 45m

$1,110

St. LouisLondon

STL - LTN

STLLTN

Lambert-St Louis

Mon 7/20

2:40 pm-4:50 pm

2 stops20h 10m

London Luton

Tue 7/28

8:00 pm-2:02 pm

2 stops24h 02m

$1,128

St. LouisLondon

STL - LTN

STLLTN

Lambert-St Louis

Tue 9/1

2:40 pm-3:30 pm

2 stops18h 50m

London Luton

Fri 9/11

6:20 am-8:00 pm

2 stops19h 40m

$1,134

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 8/26

11:22 am-6:50 am

1 stop13h 28m

London Heathrow

Sun 9/6

4:25 pm-7:30 pm

Nonstop9h 05m

$1,140

St. LouisLondon

STL - SEN

STLSEN

Lambert-St Louis

Tue 8/18

12:10 pm-11:45 am

2 stops17h 35m

London Southend

Sun 8/30

7:35 am-2:02 pm

3 stops36h 27m

$1,153

St. LouisLondon

STL - STN

STLSTN

Lambert-St Louis

Wed 9/16

8:00 am-10:10 pm

2 stops32h 10m

London Stansted

Fri 9/25

10:50 am-9:21 pm

2 stops40h 31m

$1,167

St. LouisLondon

STL - LTN

STLLTN

Lambert-St Louis

Wed 7/29

12:10 pm-3:25 pm

2 stops21h 15m

London Luton

Fri 9/4

6:20 am-8:07 pm

2 stops19h 47m

$1,185

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Fri 7/3

1:39 pm-8:50 am

2 stops13h 11m

London City

Thu 10/15

10:00 am-8:37 pm

2 stops16h 37m

$1,196

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/13

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 June.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
Trip.comPrice Accuracy1 starTrust Score*3 stars
Justfly.comPrice Accuracy3 starsTrust Score*3 stars
GurufarePrice Accuracy3 starsTrust Score*3 stars
BusinessClassPrice Accuracy-Trust Score*3 stars
MytripPrice Accuracy2 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

What is the cheapest month to book a flight from St. Louis to London?

Currently, April is the cheapest month in which you can book a flight from St. Louis to London (average of $117). Flying from St. Louis to London in June is currently the most expensive (average of $804). 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 June 19, 2026.

When flying from St. Louis to London, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

How much does it cost to fly round-trip from St. Louis to London?

How often are flights from St. Louis to London delayed?

About 26% of weekly flights between St. Louis and London have experienced delays in the past year, with the average delay time being 129 minutes.

What is the most punctual flight time for St. Louis to London flights?

Historically, flights departing at night are less likely to be delayed, whereas flights leaving at night tend to experience delays more often.

What day of the week experiences the fewest flight delays on this route?

Wednesday tends to have the lowest number of delays on this route, whereas Sunday has historically faced a higher average of delays compared to other days of the week.

Which airline has the best punctuality record on St. Louis to London flights?

Over the last year, British Airways have had the lowest number of delays on this route, with just 26% of flights being delayed.

How far ahead should I book a flight from St. Louis to London?

The best time to book flights from St. Louis to London is 5 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.

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 June 19, 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
7.8
Good
8,414 reviews

Food

7.2

Comfort

7.8

Entertainment

7.8

Overall

7.8

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
Delta
7.8
Good
8,414 reviews
Delta
7.8
Good
8,414 reviews

Food

7.2

Comfort

7.8

Entertainment

7.8

Overall

7.8

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
United Airlines
7.4
Good
9,861 reviews
Delta
7.8
Good
8,414 reviews

Food

7.2

Comfort

7.8

Entertainment

7.8

Overall

7.8

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
American Airlines
7.1
Good
11,695 reviews
Delta
7.8
Good
8,414 reviews

Food

7.2

Comfort

7.8

Entertainment

7.8

Overall

7.8

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
Iberia
7.0
Good
3,238 reviews
Delta
7.8
Good
8,414 reviews

Food

7.2

Comfort

7.8

Entertainment

7.8

Overall

7.8

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
British Airways
6.7
Okay
8,055 reviews
Delta
7.8
Good
8,414 reviews

Food

7.2

Comfort

7.8

Entertainment

7.8

Overall

7.8

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional

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 2 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 13h 11m. British Airways provides one of the quickest options available for as low as $1,196. St. Louis and London are separated by a distance of 4205 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, Delta ($483), Iberia ($529), and KLM ($529) offers the cheapest pricing from St. Louis to London. These flights start at 44% 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 Iberia, with whom users have recently found tickets for as low as $317. However, be on the lookout for offers from British Airways and American Airlines, 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 most reliable airlines from St. Louis to London?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from St. Louis to London on time: American Airlines (36%), Aer Lingus (36%), Finnair (36%).

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

    The cheapest flight price from St. Louis to London is $324. On average you can expect to pay $1,057. The most popular route, (Lambert-St Louis - London Heathrow), can usually be booked for $865.

  • 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, April is the cheapest month in which you can book a flight from St. Louis to London (average of $117). Flying from St. Louis to London in June is currently the most expensive (average of $804). 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
Dorking
Hounslow
Winchester
Croydon
Gatwick
Southend-on-Sea
Wembley
Harrow
Eastleigh
Dartford
Dover
Orpington
Watford
Chipping Norton
Hayes
Kingston upon Thames
Eastbourne
Slough
Stansted

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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 June 19, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$483Average$852FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$529Average$800FlexibilityNo cancel feeOn-time77%
KLMCheapest$529Average$683FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$532Average$888FlexibilityNo cancel feeOn-time71%
Air CanadaCheapest$572Average$868FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$572Average$810FlexibilityNo cancel feeOn-time69%
British AirwaysCheapest$576Average$925FlexibilityNo cancel feeOn-time70%
LufthansaCheapest$635Average$962FlexibilityNo cancel feeOn-time76%

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