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Cheap flights from St. Louis to London from £172

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 26/3. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LON
29 Mar — 5 Apr1
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 81 days in advance, depart on a Monday 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 27 February 2026.

Sun 1/311:55
STL
-
LHR
1 stop12h 30m
Delta
Fri 13/306:30
LHR
-
STL
2 stops19h 36m
Delta
Deal found 25/2£481
Wed 8/412:25
STL
-
LGW
2 stops16h 25m
Iberia
Wed 15/420:40
LGW
-
STL
2 stops31h 37m
Iberia
Deal found 24/2£481
Mon 17/818:49
STL
-
LHR
2 stops17h 36m
Lufthansa
Mon 24/819:30
LHR
-
STL
1 stop23h 55m
Lufthansa
Deal found 24/2£482
Wed 19/818:49
STL
-
LHR
2 stops16h 51m
Lufthansa
Fri 28/806:30
LHR
-
STL
2 stops15h 08m
Lufthansa
Deal found 24/2£483
Sat 25/416:05
STL
-
LHR
2 stops22h 55m
Air Canada
Wed 6/508:40
LHR
-
STL
2 stops17h 45m
Air Canada
Deal found 23/2£484
Mon 30/306:00
STL
-
LHR
1 stop19h 15m
Delta
Tue 14/406:30
LHR
-
STL
2 stops16h 12m
Delta
Deal found 24/2£485
Wed 16/908:55
STL
-
LHR
2 stops15h 35m
Air Canada
Wed 23/908:40
LHR
-
STL
2 stops16h 01m
Air Canada
Deal found 24/2£486
Sun 1/318:57
STL
-
LHR
1 stop11h 03m
British Airways
Fri 13/311:45
LHR
-
STL
1 stop12h 45m
British Airways
Deal found 25/2£486
Mon 30/309:45
STL
-
LHR
2 stops15h 25m
Delta
Tue 7/409:55
LHR
-
STL
2 stops19h 30m
Delta
Deal found 24/2£488
Mon 30/317:59
STL
-
LHR
2 stops13h 46m
Delta
Wed 8/406:30
LHR
-
STL
2 stops15h 46m
Delta
Deal found 24/2£489
Tue 5/518:54
STL
-
LHR
2 stops15h 46m
Lufthansa
Tue 19/519:30
LHR
-
STL
1 stop23h 55m
Lufthansa
Deal found 26/2£489
Wed 2/913:30
STL
-
LHR
1 stop11h 45m
Delta
Fri 11/906:15
LHR
-
STL
2 stops16h 40m
Delta
Deal found 24/2£490

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 27 February 2026.

Round-trip from

£481

One-way from

£172

Popular in

June

Cheapest in

January

Average price

£592

Good round-trip deal

£471 or less
Iberia
  • Iberia
  • 26/4-6/5
  • 3 total stops
  • 33h 11m total
  • St. Louis to London
Search Deals
26/3
  • 26/3
  • 2 total stops
  • 41h 39m total
  • St. Louis to London
Search Deals
Highest demand for flights based on searches. 26% potential increase in price (£167 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£22 potential savings vs. average return price).
Search Deals
Average for round-trip flights in February 2026
Search Deals
Price to beat on a round-trip flight from Lambert-St Louis to London (LON).
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 27 February 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

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 11/8

18:00-11:35

1 stop35h 35m

London Heathrow

Fri 21/8

14:10-14:02

1 stop29h 52m

£495

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 19/4

09:10-06:55

2 stops15h 45m

London Heathrow

Wed 29/4

12:15-21:08

2 stops14h 53m

£509

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 19/4

16:49-11:35

1 stop12h 46m

London Heathrow

Tue 28/4

08:30-15:24

1 stop12h 54m

£520

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 3/4

06:30-06:45

1 stop18h 15m

London Heathrow

Thu 9/4

06:50-15:48

2 stops14h 58m

£521

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 2/4

20:15-06:45

1 stop28h 30m

London Heathrow

Wed 8/4

12:05-15:24

1 stop33h 19m

£532

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sat 15/8

18:00-07:40

1 stop31h 40m

London Heathrow

Sat 29/8

17:40-14:02

1 stop26h 22m

£532

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 26/3

06:00-07:30

1 stop20h 30m

London Heathrow

Thu 2/4

08:30-15:24

1 stop12h 54m

£557

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 3/4

17:25-13:50

2 stops14h 25m

London Heathrow

Thu 9/4

09:55-21:06

2 stops17h 11m

£580

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Fri 3/4

12:28-09:25

2 stops14h 57m

London Gatwick

Wed 8/4

10:25-21:06

2 stops16h 41m

£597

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 19/5

08:30-11:10

1 stop20h 40m

London Heathrow

Tue 26/5

07:25-17:23

2 stops15h 58m

£603

Flights are sorted by cheapest return flights first.

Deals found on 26/2

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

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

Use this chart to determine the optimal time to book a return flight from St. Louis to London. Price data was last updated on 20 February 2026.

Booking 25 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, February is the cheapest month in which you can book a flight from St. Louis to London (average of £391). Flying from St. Louis to London in June is currently the most expensive (average of £739). 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.

Chicago (ORD) – chosen by Cheapflights users on 41% 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 £541.

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 23m.

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 42m.

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 27 February 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
7,772 reviews
Check prices

Crew

7.6

Food

6.4

Overall

6.7

Entertainment

6.4

Boarding

6.9

Comfort

6.8

Reviews

1 / 20
2.0
Mediocre

Natasha,Feb 2026

SEA - LHR

I already said the thing about the list luggage, which actually this flight.
British Airways
6.7
Okay
7,772 reviews
British Airways
6.7
Okay
7,772 reviews
Check prices

Crew

7.6

Food

6.4

Overall

6.7

Entertainment

6.4

Boarding

6.9

Comfort

6.8

Reviews

1 / 20
2.0
Mediocre

Natasha,Feb 2026

SEA - LHR

I already said the thing about the list luggage, which actually this flight.

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 0 outbound flights to London per day from 3 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 57m. United Airlines provides one of the quickest options available for as low as £597. The distance between St. Louis and London is about 4207 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.Alternate airlines flying return to your destination include British Airways and United Airlines. Users have found that Virgin Atlantic 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 cheapest flights from St. Louis to London?

    While on average a flight from St. Louis to London is generally £579, our data shows the cheapest flight currently is £435. When looking at the most popular route, (Lambert-St Louis - London Heathrow), you can expect to pay £472 for that flight.

  • 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, February is the cheapest month in which you can book a flight from St. Louis to London (average of £391). Flying from St. Louis to London in June is currently the most expensive (average of £739). 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
Croydon
Wembley
Luton
Gatwick
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Hounslow
Ilford
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Romford
Folkestone

Browse thousands of different options on Cheapflights for your next trip

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Top 3 airlines flying from St. Louis to London

Discover the top 3 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 27 February 2026.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£406Average£577FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£428Average£655FlexibilityNo cancel feeOn-time70%
Search British Airways flights
United AirlinesCheapest£501Average£672FlexibilityNo cancel feeOn-time69%
Search United Airlines 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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