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Cheap flights from St. Louis to London from £164

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 19/10. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LON
25 Aug — 1 Sep1
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 Friday

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 26 July 2026.

Thu 10/1216:05
STL
-
LHR
1 stop10h 25m
Air Canada
Mon 14/1218:00
LHR
-
STL
1 stop27h 26m
Air Canada
Deal found 21/7£723
Sun 27/912:00
STL
-
LCY
2 stops13h 55m
Delta
Tue 6/1009:20
LCY
-
STL
2 stops17h 21m
Delta
Deal found 22/7£724
Sun 11/1012:10
STL
-
LHR
1 stop12h 20m
United Airlines
Tue 3/1113:35
LHR
-
STL
1 stop13h 38m
United Airlines
Deal found 22/7£724
Sun 23/821:40
STL
-
LHR
Nonstop8h 00m
Aer Lingus
Tue 1/911:10
LHR
-
STL
1 stop14h 17m
Aer Lingus
Deal found 21/7£725
Wed 19/808:40
STL
-
LCY
2 stops18h 00m
Lufthansa
Fri 28/809:15
LCY
-
STL
2 stops19h 44m
Lufthansa
Deal found 21/7£726
Wed 7/1013:29
STL
-
LHR
2 stops17h 11m
Lufthansa
Mon 12/1019:30
LHR
-
STL
2 stops31h 51m
Lufthansa
Deal found 21/7£726
Sun 23/808:55
STL
-
LHR
1 stop20h 55m
Multiple Airlines
Sun 6/906:30
LHR
-
STL
1 stop12h 55m
Multiple Airlines
Deal found 24/7£726
Tue 15/912:59
STL
-
LHR
2 stops15h 41m
Lufthansa
Wed 23/911:30
LHR
-
STL
2 stops17h 29m
Lufthansa
Deal found 25/7£727
Tue 13/1015:30
STL
-
LTN
2 stops26h 15m
Multiple Airlines
Tue 20/1019:55
LTN
-
STL
3 stops28h 46m
Multiple Airlines
Deal found 24/7£727
Sun 15/1116:26
STL
-
LHR
1 stop10h 49m
Multiple Airlines
Sat 28/1111:10
LHR
-
STL
2 stops16h 03m
Multiple Airlines
Deal found 22/7£728
Sun 16/818:34
STL
-
LGW
2 stops33h 26m
Multiple Airlines
Sat 22/814:00
LGW
-
STL
1 stop32h 11m
Multiple Airlines
Deal found 25/7£728
Tue 13/1013:29
STL
-
LHR
2 stops21h 11m
Lufthansa
Mon 2/1119:15
LHR
-
STL
2 stops31h 58m
Lufthansa
Deal found 22/7£729

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 26 July 2026.

Round-trip from

£723

One-way from

£164

Popular in

June

Cheapest in

October

Average price

£998
Air Canada
  • Air Canada
  • 10/12-14/12
  • 2 total stops
  • 37h 51m total
  • St. Louis to London
Search Deals
19/10
  • 19/10
  • 2 total stops
  • 17h 25m total
  • St. Louis to London
Search Deals
Highest demand for flights based on searches. 27% potential increase in price (£189 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (£25 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 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 26 July 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 - LCY

STLLCY

Lambert-St Louis

Sun 27/9

11:21-07:55

2 stops14h 34m

London City

Tue 6/10

08:25-20:41

2 stops18h 16m

£724

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 1/9

06:00-07:15

1 stop19h 15m

London Heathrow

Sun 6/9

06:30-14:47

2 stops14h 17m

£739

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 4/9

06:15-07:55

1 stop19h 40m

London Heathrow

Fri 11/9

06:50-15:38

2 stops14h 48m

£740

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 20/8

08:55-06:30

2 stops15h 35m

London Heathrow

Thu 27/8

06:50-14:57

2 stops14h 07m

£742

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 17/9

10:29-06:45

2 stops14h 16m

London Heathrow

Fri 2/10

08:40-19:58

2 stops17h 18m

£743

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 26/8

09:15-07:10

2 stops15h 55m

London Heathrow

Sun 6/9

06:30-14:47

2 stops14h 17m

£744

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 17/9

10:29-06:45

2 stops14h 16m

London Heathrow

Tue 22/9

06:30-17:40

2 stops17h 10m

£744

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 17/9

06:00-11:55

1 stop23h 55m

London Heathrow

Fri 2/10

12:05-14:00

1 stop31h 55m

£750

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sat 17/10

17:36-09:00

1 stop33h 24m

London Heathrow

Sat 31/10

15:00-16:26

1 stop30h 26m

£750

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 7/10

08:30-11:55

3 stops21h 25m

London Heathrow

Thu 15/10

21:25-23:45

2 stops32h 20m

£759

Flights are sorted by cheapest return flights first.

Deals found on 23/7

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, October is the cheapest month in which you can book a flight from St. Louis to London (average of £497). Flying from St. Louis to London in June is currently the most expensive (average of £1,053). 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 26 July 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?

Airfare is typical for this route at the moment.
St. Louis to London flights typically cost between £656 and £933 in December.
The cheapest return price found within the last 5 days was £723 on Air Canada (10 Dec–14 Dec).

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 56% 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.

Atlanta (ATL) is the most affordable one-stop option, with an average return flight price of £480.

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 Chicago (ORD) have the shortest average one-way travel time for one-stop routes: 11h 17m.

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 26% of weekly flights between St. Louis and London have experienced delays in the past year, with the average delay time being 131 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 Wednesday 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 26% of flights being delayed.

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

Booking 11 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 14h 34m. Delta provides one of the quickest options available for as low as £724. The distance between St. Louis and London is about 4205 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?

    British Airways, at £435, was found to be the cheapest airline from St. Louis to London. An alternate airline flying to your destination would be Virgin Atlantic. Users have found that British Airways is 35% 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 (65%), Aer Lingus (65%) and Finnair (65%).

  • 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, October is the cheapest month in which you can book a flight from St. Louis to London (average of £497). Flying from St. Louis to London in June is currently the most expensive (average of £1,053). 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
Luton
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Gatwick
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Ilford
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Croydon
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Brentford
Eastbourne
Watford
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Southall
Aylesbury
Dover
Romford
Enfield

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 26 July 2026.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£435Average£569FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£474Average£586FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights

Fly with Cheapflights

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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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