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Cheap flights from St. Louis to London from £196

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 17/7. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LON
8 Jul — 15 Jul1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Lambert-St Louis to London are usually found in October or January, booked 12 days in advance, depart on a Wednesday or Tuesday and return on a Thursday

Cheap flight deals from St. Louis to London

Enter your travel dates to find the best prices.

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 8 June 2026.

Sun 2/814:31
STL
-
LHR
1 stop11h 34m
British Airways
Sun 16/814:25
LHR
-
STL
1 stop14h 16m
British Airways
Deal found 5/6£798
Tue 4/814:32
STL
-
LHR
1 stop12h 33m
British Airways
Sat 15/812:55
LHR
-
STL
1 stop13h 31m
British Airways
Deal found 4/6£798
Sat 1/817:59
STL
-
LHR
1 stop33h 01m
United Airlines
Sat 15/817:40
LHR
-
STL
1 stop32h 42m
United Airlines
Deal found 5/6£799
Tue 11/821:35
STL
-
LHR
Nonstop8h 00m
British Airways
Fri 21/816:25
LHR
-
STL
Nonstop9h 05m
British Airways
Deal found 5/6£800
Fri 14/815:30
STL
-
LHR
1 stop17h 10m
Lufthansa
Sun 27/906:30
LHR
-
STL
2 stops20h 51m
Lufthansa
Deal found 7/6£801
Wed 23/915:30
STL
-
LCY
1 stop20h 25m
Lufthansa
Wed 30/909:15
LCY
-
STL
2 stops19h 44m
Lufthansa
Deal found 4/6£802
Tue 7/718:34
STL
-
LGW
2 stops33h 26m
Multiple Airlines
Tue 21/714:00
LGW
-
STL
1 stop15h 59m
Multiple Airlines
Deal found 4/6£802
Sat 29/816:50
STL
-
LHR
1 stop21h 50m
United Airlines
Mon 7/907:45
LHR
-
STL
1 stop14h 21m
United Airlines
Deal found 5/6£803
Wed 12/812:10
STL
-
LHR
1 stop12h 20m
Air Canada
Sun 16/809:30
LHR
-
STL
1 stop15h 12m
Air Canada
Deal found 6/6£804
Fri 4/908:55
STL
-
LHR
2 stops15h 35m
Multiple Airlines
Sat 12/912:40
LHR
-
STL
2 stops14h 50m
Multiple Airlines
Deal found 4/6£804
Mon 6/715:30
STL
-
LGW
2 stops18h 55m
Multiple Airlines
Sun 12/714:15
LGW
-
STL
2 stops29h 10m
Multiple Airlines
Deal found 3/6£804
Sun 30/815:30
STL
-
LHR
1 stop15h 10m
Lufthansa
Sun 6/908:30
LHR
-
STL
2 stops20h 29m
Lufthansa
Deal found 5/6£805

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 8 June 2026.

Round-trip from

£798

One-way from

£196

Popular in

June

Cheapest in

October

Average price

£1,034
British Airways
  • British Airways
  • 2/8-16/8
  • 2 total stops
  • 25h 50m total
  • St. Louis to London
Search Deals
17/7
  • 17/7
  • 2 total stops
  • 59h 03m total
  • St. Louis to London
Search Deals
Highest demand for flights based on searches. 27% potential increase in price (£182 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (£27 potential savings vs. average return price).
Search Deals
Average for round-trip flights in June 2026
Search Deals

Cheapflights Fare Finder

 
Customise 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 858,174 searches. Data last updated 8 June 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 return flight

St. LouisLondon

STL - SEN

STLSEN

Lambert-St Louis

Mon 6/7

08:55-11:20

3 stops20h 25m

London Southend

Tue 21/7

06:30-18:42

2 stops18h 12m

£813

St. LouisLondon

STL - LTN

STLLTN

Lambert-St Louis

Wed 1/7

08:55-14:00

3 stops23h 05m

London Luton

Mon 6/7

21:50-20:07

3 stops28h 17m

£822

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 7/8

15:39-13:15

1 stop15h 36m

London Heathrow

Sun 16/8

11:30-23:26

2 stops17h 56m

£832

St. LouisLondon

STL - LTN

STLLTN

Lambert-St Louis

Mon 6/7

15:30-22:50

2 stops25h 20m

London Luton

Mon 13/7

08:15-13:25

2 stops35h 10m

£852

St. LouisLondon

STL - LTN

STLLTN

Lambert-St Louis

Fri 17/7

08:55-18:05

3 stops27h 10m

London Luton

Wed 22/7

05:40-18:42

2 stops19h 02m

£853

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Wed 1/7

16:17-10:00

1 stop35h 43m

London Gatwick

Mon 13/7

14:00-23:59

1 stop15h 59m

£855

St. LouisLondon

STL - LTN

STLLTN

Lambert-St Louis

Mon 6/7

08:55-14:00

3 stops23h 05m

London Luton

Mon 20/7

21:50-18:42

2 stops26h 52m

£879

St. LouisLondon

STL - LTN

STLLTN

Lambert-St Louis

Fri 14/8

15:30-19:15

2 stops21h 45m

London Luton

Mon 24/8

08:30-21:17

3 stops18h 47m

£896

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Tue 21/7

13:54-09:25

2 stops13h 31m

London Gatwick

Wed 29/7

10:25-22:15

2 stops17h 50m

£917

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 28/7

06:01-10:25

1 stop22h 24m

London Heathrow

Tue 4/8

17:40-14:02

1 stop26h 22m

£919

Flights are sorted by cheapest return flights first.

Deals found on 3/6

Showing 1-10 of 60 resultsSorted by cheapest first
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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 return 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 £88). Flying from St. Louis to London in June is currently the most expensive (average of £603). 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 8 June 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from St. Louis to London as you normally would.

How much does it cost for a return flight from St. Louis to London?

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

Share of one-stop return flights from St. Louis to London chosen by Cheapflights users in the past 12 months, using the same stopover each way.

Atlanta (ATL) – chosen by Cheapflights users on 50% of one-stop itineraries from St. Louis to London on Cheapflights.

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

Average return fare for one-stop flights from St. Louis to London, chosen by Cheapflights users in the past 12 months, with the same stopover each way.

Montreal (YUL) is the most affordable one-stop option, with an average return flight price of £438.

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

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

Flights via Montreal (YUL) have the shortest average one-way travel time for one-stop routes: 11h 00m.

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

Average stopover duration for one-stop one-way flights from St. Louis to London, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Atlanta (ATL) offer the fastest connection on this route, with an average stopover time of 1h 41m.

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

About 27% of weekly flights between St. Louis and London have experienced delays in the past year, with the average delay time being 162 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 past year, British Airways have had the lowest number of delays on this route, with just 27% of flights being delayed.

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

Booking 5 days in advance of your planned departure date is, on average, the best time to get cheap flights from St. Louis to London. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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?

    Most people fly from Lambert-St Louis (STL) if they book a flight from St. Louis to London. On average, Lambert-St Louis has 2 outbound flights to London per day from 2 airlines. Lambert-St Louis is conveniently located just 12.7 mi 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 15h 36m. Delta provides one of the quickest options available for as low as £832. The distance between St. Louis and London is about 4186 mi. Both multi-stop and direct flights can be found to your destination and back.

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

    Virgin Atlantic, at £412, was found to be the cheapest airline from St. Louis to London. An alternate airline flying to your destination would be British Airways. Users have found that Virgin Atlantic is 37% cheaper than the other options available to this destination.

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

    While some choose either Lambert-St Louis - London Gatwick or Lambert-St Louis - London Stansted, Lambert-St Louis - London Heathrow is the most popular route from St. Louis to London.

  • What are the most reliable airlines from St. Louis to London?

    The top 3 most reliable airlines when flying from St. Louis to London are American Airlines (32%), Aer Lingus (32%) and Finnair (32%).

  • 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 holiday 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 £88). Flying from St. Louis to London in June is currently the most expensive (average of £603). 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

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Hounslow
Milton Keynes
Wembley
Luton
Gatwick
Croydon
Ilford
Slough
Hayes
Brentford
Colchester
Kingston upon Thames
Eastbourne
Watford
Ipswich
Romford
Guildford
Borehamwood
Folkestone
Southall

Browse thousands of different options on Cheapflights for your next trip

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Top 2 airlines flying from St. Louis to London

Discover the top 2 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 858,174 searches. Data last updated 8 June 2026.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£412Average£566FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£434Average£664FlexibilityNo cancel feeOn-time70%
Search British Airways flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from St. Louis to London?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from St. Louis to London. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from St. Louis to London?

Millions of users choose and trust Cheapflights to book the best flight deals from St. Louis to London for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from St. Louis to London with no change fees?

Yes! Cheapflights helps users easily find flights from St. Louis to London with no change fees.

Can Cheapflights notify me if prices for flights from St. Louis to London become cheaper?

Yes! Start tracking prices for St. Louis to London flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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