HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
London

$207+ 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 7/28. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LON
Aug 6 — Aug 131
Thu 8/6
Thu 8/13
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from St. Louis to London with Cheapflights

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

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.
Cheapflights Tip: The best prices from Lambert-St Louis to London are usually found in October or January, booked 47 days in advance, depart on a Thursday or Monday 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 July 7, 2026.

This Air Canada deal was found by Cheapflights users on 7/6. 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 7/6$1,071
This Air Canada deal was found by Cheapflights users on 7/7. 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.
Thu 10/112:10 pm
STL
-
LHR
2 stops14h 25m
Air Canada
Sun 10/119:30 am
LHR
-
STL
2 stops16h 30m
Air Canada
Deal found 7/7$1,072
This Trip.com deal was found by Cheapflights users on 7/3. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/303:30 pm
STL
-
LCY
1 stop20h 25m
Lufthansa
Mon 9/76:30 pm
LCY
-
STL
1 stop24h 55m
Lufthansa
Deal found 7/3$1,073
This Mytrip deal was found by Cheapflights users on 7/4. 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 9/1512:10 pm
STL
-
STN
2 stops22h 30m
Multiple Airlines
Mon 9/216:30 am
STN
-
STL
2 stops19h 50m
Multiple Airlines
Deal found 7/4$1,073
This KAYAK deal was found by Cheapflights users on 7/5. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/161:29 pm
STL
-
LHR
2 stops23h 11m
Austrian Airlines
Thu 10/296:00 am
LHR
-
STL
2 stops17h 06m
Austrian Airlines
Deal found 7/5$1,074
This Mytrip deal was found by Cheapflights users on 7/5. 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 8/412:10 pm
STL
-
LGW
3 stops22h 15m
Multiple Airlines
Tue 8/116:00 am
LGW
-
STL
2 stops20h 24m
Multiple Airlines
Deal found 7/5$1,074
This FlightHub deal was found by Cheapflights users on 7/2. 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.
Fri 9/45:30 pm
STL
-
LHR
2 stops31h 00m
Air Canada
Sun 9/1312:40 pm
LHR
-
STL
2 stops31h 20m
Air Canada
Deal found 7/2$1,075
This Cheapflightsfares deal was found by Cheapflights users on 7/5. 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.
Sat 9/195:18 pm
STL
-
LHR
2 stops14h 37m
Aer Lingus
Wed 9/239:50 am
LHR
-
STL
2 stops20h 37m
Aer Lingus
Deal found 7/5$1,077
This Icelandair deal was found by Cheapflights users on 7/3. 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 Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/51:05 pm
STL
-
LGW
2 stops19h 35m
Multiple Airlines
Sun 10/113:40 pm
LGW
-
STL
2 stops37h 35m
Multiple Airlines
Deal found 7/3$1,077
This oojo deal was found by Cheapflights users on 7/6. 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 8/59:35 pm
STL
-
LHR
Nonstop8h 00m
British Airways
Fri 8/1412:00 pm
LHR
-
STL
1 stop12h 59m
British Airways
Deal found 7/6$1,078
This Icelandair deal was found by Cheapflights users on 7/6. 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 Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/1210:35 am
STL
-
LGW
2 stops18h 20m
Multiple Airlines
Fri 12/1811:55 am
LGW
-
STL
2 stops18h 00m
Multiple Airlines
Deal found 7/6$1,078
This Delta deal was found by Cheapflights users on 7/5. 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.
Fri 8/2812:52 pm
STL
-
LHR
1 stop11h 33m
Delta
Thu 9/39:20 am
LHR
-
STL
1 stop12h 57m
Delta
Deal found 7/5$1,079

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 July 7, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,071
(Air Canada)

One-way from

$207
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$1,297

Good round-trip deal

$1,077 or less

Good one-way deal

$678 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 ($349 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($46 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 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 July 7, 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 - LGW

STLLGW

Lambert-St Louis

Mon 10/5

1:05 pm-2:40 pm

2 stops19h 35m

London Gatwick

Sun 10/11

3:40 pm-11:15 pm

2 stops37h 35m

$1,077

St. LouisLondon

STL - LTN

STLLTN

Lambert-St Louis

Wed 9/9

12:10 pm-9:25 am

2 stops15h 15m

London Luton

Wed 9/16

9:40 am-2:00 pm

3 stops34h 20m

$1,080
Quickest round-trip

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 10/7

9:35 pm-11:35 am

Nonstop8h 00m

London Heathrow

Tue 10/13

4:25 pm-7:30 pm

Nonstop9h 05m

$1,081

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 9/8

4:50 pm-10:30 am

1 stop11h 40m

London Heathrow

Wed 9/16

4:25 pm-7:30 pm

Nonstop9h 05m

$1,089

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Sat 9/5

10:33 am-9:20 am

2 stops16h 47m

London Gatwick

Sun 9/13

10:25 am-11:16 pm

2 stops18h 51m

$1,095

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 9/27

12:00 pm-9:40 pm

2 stops27h 40m

London Heathrow

Fri 10/9

6:40 am-9:16 pm

3 stops20h 36m

$1,105

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 10/9

9:35 pm-11:35 am

Nonstop8h 00m

London Heathrow

Sun 10/18

4:25 pm-7:30 pm

Nonstop9h 05m

$1,112

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sat 10/3

3:40 pm-11:55 am

2 stops14h 15m

London Heathrow

Thu 10/8

9:25 pm-11:15 pm

2 stops31h 50m

$1,116

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Tue 8/11

4:05 pm-2:40 pm

2 stops16h 35m

London Gatwick

Fri 8/21

3:40 pm-9:35 pm

2 stops35h 55m

$1,116

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Mon 7/27

7:08 am-7:15 am

2 stops18h 07m

London City

Wed 8/12

7:45 am-8:42 pm

2 stops18h 57m

$1,134

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/3

Showing 1-10 of 60 resultsSorted by cheapest first
1
2
3
...
6

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 July.
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 July 7, 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 31% of weekly flights between St. Louis and London have experienced delays in the past year, with the average delay time being 139 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?

Friday 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 31% 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 July 7, 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
8,452 reviews

Boarding

8.1

Crew

8.5

Entertainment

7.8

Comfort

7.8

Food

7.2

Overall

7.8

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
8,452 reviews
Delta
7.8
Good
8,452 reviews

Boarding

8.1

Crew

8.5

Entertainment

7.8

Comfort

7.8

Food

7.2

Overall

7.8

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
9,945 reviews
Delta
7.8
Good
8,452 reviews

Boarding

8.1

Crew

8.5

Entertainment

7.8

Comfort

7.8

Food

7.2

Overall

7.8

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
11,785 reviews
Delta
7.8
Good
8,452 reviews

Boarding

8.1

Crew

8.5

Entertainment

7.8

Comfort

7.8

Food

7.2

Overall

7.8

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
3,249 reviews
Delta
7.8
Good
8,452 reviews

Boarding

8.1

Crew

8.5

Entertainment

7.8

Comfort

7.8

Food

7.2

Overall

7.8

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
8,103 reviews
Delta
7.8
Good
8,452 reviews

Boarding

8.1

Crew

8.5

Entertainment

7.8

Comfort

7.8

Food

7.2

Overall

7.8

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 9 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 8h. British Airways provides one of the quickest options available for as low as $1,081. 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, 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 American Airlines and British Airways, 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 (50%), Aer Lingus (50%), Finnair (50%).

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

    The cheapest flight price from St. Louis to London is $490. On average you can expect to pay $2,157. The most popular route, (Lambert-St Louis - London Heathrow), can usually be booked for $837.

  • 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
Watford
Chipping Norton
Kingston upon Thames
Eastbourne
Slough
Stansted
Sutton
Luton
Harlow

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 9 airlines flying from St. Louis to London

Discover the top 9 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 7, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$483Average$898FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$529Average$800FlexibilityNo cancel feeOn-time77%
KLMCheapest$529Average$683FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$532Average$898FlexibilityNo cancel feeOn-time71%
Air CanadaCheapest$572Average$962FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$572Average$812FlexibilityNo cancel feeOn-time69%
British AirwaysCheapest$576Average$991FlexibilityNo cancel feeOn-time70%
Virgin AtlanticCheapest$615Average$967FlexibilityNo cancel feeOn-time72%
LufthansaCheapest$635Average$962FlexibilityNo cancel feeOn-time76%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.