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Cheap flights from St. Louis to London from £236

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 18/8. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LON
26 May — 2 Jun1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Lambert-St Louis to London are usually found in January or October, 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 26 April 2026.

Thu 14/515:33
STL
-
LGW
2 stops36h 27m
Multiple Airlines
Thu 28/514:00
LGW
-
STL
1 stop15h 57m
Multiple Airlines
Deal found 20/4£582
Thu 14/516:19
STL
-
LGW
1 stop35h 41m
Multiple Airlines
Tue 26/514:00
LGW
-
STL
1 stop15h 57m
Multiple Airlines
Deal found 20/4£595
Mon 11/517:27
STL
-
LGW
2 stops30h 53m
Multiple Airlines
Wed 27/514:00
LGW
-
STL
1 stop15h 57m
Multiple Airlines
Deal found 20/4£604
Mon 11/517:27
STL
-
LGW
2 stops30h 53m
Multiple Airlines
Tue 26/514:00
LGW
-
STL
1 stop15h 57m
Multiple Airlines
Deal found 20/4£612
Wed 19/817:33
STL
-
LGW
2 stops30h 47m
Multiple Airlines
Wed 26/814:00
LGW
-
STL
1 stop16h 14m
Multiple Airlines
Deal found 21/4£613
Sun 16/818:33
STL
-
LGW
2 stops33h 27m
Multiple Airlines
Wed 26/814:00
LGW
-
STL
1 stop16h 14m
Multiple Airlines
Deal found 21/4£615
Mon 25/516:19
STL
-
LGW
1 stop35h 41m
Multiple Airlines
Mon 1/614:00
LGW
-
STL
2 stops33h 33m
Multiple Airlines
Deal found 24/4£618
Thu 14/520:08
STL
-
LGW
2 stops31h 52m
Multiple Airlines
Sat 30/514:00
LGW
-
STL
1 stop15h 57m
Multiple Airlines
Deal found 20/4£623
Wed 4/1115:42
STL
-
LHR
2 stops18h 18m
Scandinavian Airlines
Wed 18/1106:40
LHR
-
STL
2 stops22h 59m
Scandinavian Airlines
Deal found 21/4£627
Mon 5/1008:55
STL
-
LHR
2 stops30h 05m
Air Canada
Wed 7/1017:15
LHR
-
STL
2 stops31h 26m
Air Canada
Deal found 23/4£630
Tue 6/1019:05
STL
-
LHR
1 stop12h 10m
KLM
Tue 13/1011:45
LHR
-
STL
2 stops35h 21m
KLM
Deal found 21/4£634
Sun 16/816:10
STL
-
LGW
1 stop35h 50m
Multiple Airlines
Tue 25/814:00
LGW
-
STL
1 stop16h 14m
Multiple Airlines
Deal found 21/4£634

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 April 2026.

Round-trip from

£613

One-way from

£236

Popular in

June

Cheapest in

January

Average price

£549
19/8-26/8
  • 19/8-26/8
  • 3 total stops
  • 47h 01m total
  • St. Louis to London
Search Deals
British Airways
  • British Airways
  • 18/8
  • Nonstop
  • 8h 00m total
  • St. Louis to London
Search Deals
Highest demand for flights based on searches. 25% potential increase in price (£162 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (£24 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 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 April 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 - LHR

STLLHR

Lambert-St Louis

Tue 13/10

16:13-12:05

1 stop13h 52m

London Heathrow

Tue 20/10

06:30-16:50

2 stops16h 20m

£641

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 7/10

09:00-07:10

2 stops16h 10m

London Heathrow

Mon 12/10

06:30-16:50

2 stops16h 20m

£681

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 2/9

13:30-10:20

2 stops14h 50m

London Heathrow

Fri 11/9

06:30-16:55

2 stops16h 25m

£697

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Wed 2/9

10:45-07:55

2 stops15h 10m

London City

Fri 11/9

10:00-20:50

2 stops16h 50m

£715

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Sun 4/10

17:45-16:40

2 stops16h 55m

London City

Wed 14/10

09:20-23:18

2 stops19h 58m

£715

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Wed 26/8

12:10-07:15

2 stops13h 05m

London City

Wed 9/9

09:20-20:50

2 stops17h 30m

£716

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Sat 17/10

17:30-13:15

2 stops13h 45m

London City

Sat 24/10

10:00-20:49

2 stops16h 49m

£737

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sat 15/8

13:30-11:20

1 stop15h 50m

London Heathrow

Sat 29/8

06:30-16:45

2 stops16h 15m

£768

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Thu 27/8

14:18-09:30

2 stops13h 12m

London City

Mon 31/8

09:20-20:50

2 stops17h 30m

£789

St. LouisLondon

STL - LTN

STLLTN

Lambert-St Louis

Mon 25/5

07:05-12:45

2 stops23h 40m

London Luton

Thu 4/6

06:05-20:25

2 stops20h 20m

£792

Flights are sorted by cheapest return flights first.

Deals found on 24/4

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

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

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.

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 £86). Flying from St. Louis to London in June is currently the most expensive (average of £609). 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.

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 45% 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.

Chicago (ORD) is the most affordable one-stop option, with an average return flight price of £551.

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: 10h 56m.

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 Chicago (ORD) offer the fastest connection on this route, with an average stopover time of 1h 47m.

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 26 April 2026.
Read through reviews of airlines operating flights from St. Louis to London, such as British Airways. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
British Airways
6.7
Okay
7,917 reviews
Check prices

Comfort

6.8

Boarding

6.9

Crew

7.7

Entertainment

6.4

Food

6.4

Overall

6.7

Reviews

1 / 20
10.0
Excellent

Viorica,Mar 2026

PHX - LHR

The food lately is just from poor to very poor. I bealeave that you can serve less quantities for more quality food. Exemple : at breakfast : omlete and vegetarian omlete ....I beleave with less work less personel could be provide some hummus and carrots and some boiled egss plus whatever snacks or drinks you wish....... Thank you in advance
British Airways
6.7
Okay
7,917 reviews
British Airways
6.7
Okay
7,917 reviews
Check prices

Comfort

6.8

Boarding

6.9

Crew

7.7

Entertainment

6.4

Food

6.4

Overall

6.7

Reviews

1 / 20
10.0
Excellent

Viorica,Mar 2026

PHX - LHR

The food lately is just from poor to very poor. I bealeave that you can serve less quantities for more quality food. Exemple : at breakfast : omlete and vegetarian omlete ....I beleave with less work less personel could be provide some hummus and carrots and some boiled egss plus whatever snacks or drinks you wish....... Thank you in advance

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 13h 52m. Delta provides one of the quickest options available for as low as £641. 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 £406, 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 36% 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.

  • 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 £86). Flying from St. Louis to London in June is currently the most expensive (average of £609). 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
Milton Keynes
Wembley
Croydon
Hounslow
Luton
Gatwick
Ilford
Slough
Hayes
Brentford
Colchester
Watford
Kingston upon Thames
Romford
Eastbourne
Ipswich
Southend-on-Sea
Guildford
Bishop's Stortford
Chelmsford

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 April 2026.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£406Average£558FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£428Average£654FlexibilityNo 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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