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Cheap flights from London to St. Louis from £333

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 3/3. Fares are subject to change and may not be available on all flights or dates of travel.
LON — STL
6 Dec — 13 Dec1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from London to Lambert-St Louis are usually found in March or January, booked 13 days in advance, depart on a Saturday or Monday and return on a Wednesday

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Cheapest flights from London to St. Louis
Explore the most affordable flight options available from London to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 6 November 2025.

Thu 13/1114:00LGW - STL
2 stops25h 07mMultiple Airlines
Sun 14/1209:54STL - LGW
1 stop18h 06mMultiple Airlines
Deal found 4/11£541
Tue 2/1208:40LHR - STL
2 stops19h 17mVirgin Atlantic
Tue 9/1210:45STL - LHR
2 stops14h 55mVirgin Atlantic
Deal found 4/11£545
Mon 8/1212:35LHR - STL
1 stop12h 30mMultiple Airlines
Tue 23/1211:41STL - LHR
1 stop16h 19mMultiple Airlines
Deal found 4/11£549
Tue 2/1206:30LHR - STL
2 stops16h 40mDelta
Tue 9/1210:45STL - LHR
2 stops15h 20mDelta
Deal found 4/11£551
Fri 5/1208:20LHR - STL
1 stop14h 14mBritish Airways
Thu 11/1214:09STL - LHR
1 stop11h 11mBritish Airways
Deal found 5/11£558
Fri 5/1206:30LHR - STL
2 stops15h 36mVirgin Atlantic
Thu 11/1209:00STL - LHR
1 stop16h 05mVirgin Atlantic
Deal found 4/11£559
Tue 2/1209:20LCY - STL
2 stops18h 37mVirgin Atlantic
Tue 9/1214:38STL - LCY
2 stops19h 57mVirgin Atlantic
Deal found 4/11£563
Wed 3/1210:00LCY - STL
2 stops16h 47mVirgin Atlantic
Wed 10/1214:38STL - LCY
2 stops20h 42mVirgin Atlantic
Deal found 3/11£564
Fri 5/1217:00LHR - STL
2 stops27h 24mFinnair
Thu 11/1216:36STL - LHR
1 stop13h 29mFinnair
Deal found 5/11£565
Thu 4/1215:35LHR - STL
2 stops23h 48mFinnair
Thu 11/1214:09STL - LHR
1 stop11h 11mFinnair
Deal found 3/11£567
Mon 24/1114:45LHR - STL
1 stop14h 22mBritish Airways
Mon 1/1215:43STL - LHR
1 stop10h 32mBritish Airways
Deal found 5/11£572
Fri 14/1114:00LGW - STL
2 stops25h 07mMultiple Airlines
Sat 13/1215:30STL - LGW
1 stop12h 35mMultiple Airlines
Deal found 4/11£572

Cheap flight deals from London to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from London (LON) to St. Louis (STL). 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 6 November 2025.

Round-trip from

£542

One-way from

£333

Popular in

December

Cheapest in

March

Average price

£723

Good round-trip deal

£469 or less
British Airways
  • British Airways
  • 22/4-28/4
  • 2 total stops
  • 23h 44m total
  • London to St. Louis
Search Deals
British Airways
  • British Airways
  • 3/3
  • 2 total stops
  • 16h 41m total
  • London to St. Louis
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (£30 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£24 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2025
Search Deals
Price to beat on a round-trip flight from London (LON) to Lambert-St Louis.
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from London to St. Louis 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 6 November 2025.
Use the filters below to find and compare flights from London to St. Louis that are best for you.

Fly from

London

Fly to

St. Louis

Route

Depart

Return

Price

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 22/4

07:30-21:48

2 stops20h 18m

Lambert-St Louis

Tue 28/4

12:06-14:25

1 stop20h 19m

£547

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Thu 5/3

11:20-19:30

2 stops38h 10m

Lambert-St Louis

Mon 9/3

09:39-09:00

2 stops18h 21m

£548

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 2/12

06:30-17:10

2 stops16h 40m

Lambert-St Louis

Tue 9/12

10:45-08:05

2 stops15h 20m

£551

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 14/1

09:55-18:34

1 stop14h 39m

Lambert-St Louis

Wed 11/2

15:54-09:15

1 stop11h 21m

£553

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 14/1

11:45-20:45

2 stops15h 00m

Lambert-St Louis

Wed 11/2

13:00-11:40

1 stop16h 40m

£555

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 7/1

14:45-23:12

1 stop14h 27m

Lambert-St Louis

Wed 14/1

10:00-12:20

1 stop20h 20m

£558

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 22/4

16:25-19:30

Nonstop9h 05m

Lambert-St Louis

Tue 28/4

22:00-12:05

Nonstop8h 05m

£558

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 7/1

06:45-22:44

2 stops21h 59m

Lambert-St Louis

Wed 14/1

18:44-11:35

1 stop10h 51m

£558

LondonSt. Louis

LCY - STL

LCYSTL

London City

Tue 2/12

09:20-21:57

2 stops18h 37m

Lambert-St Louis

Tue 9/12

14:38-16:35

2 stops19h 57m

£563

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Mon 1/12

14:00-23:57

1 stop15h 57m

Lambert-St Louis

Fri 5/12

15:30-10:00

1 stop12h 30m

£591

Flights are sorted by cheapest return flights first.

Deals found on 6/11

Showing 1-10 of 60 results
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Best time to book a flight from London to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from London 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 London to St. Louis

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

Use this chart to determine the optimal time to book a return flight from London to St. Louis. Price data was last updated on 31 October 2025.

To ensure you get the cheapest price possible for a flight from London to St. Louis, you should look to book at least 13 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from London to St. Louis?

Currently, September is the cheapest month in which you can book a flight from London to St. Louis (average of £418). Flying from London to St. Louis in July is currently the most expensive (average of £635). 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 LON to STL?

Find hourly flight availability from London to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 6 November 2025.

It’s typically best to fly out from London to St. Louis in the evening. Doing so could potentially save you 37% on the flight price compared to flying in the afternoon, which is usually more expensive.

What is the cheapest day to fly from London to St. Louis?

Use this chart to determine the cheapest time to fly return from London to St. Louis. Price data was last updated on 16 December 2024.

Travellers seeking maximum savings on their London to St. Louis flight should consider departing on Wednesday at midday when fares are most often at their lowest. Saturday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

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

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

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

Chicago (ORD) – chosen by Cheapflights users on 60% of one-stop itineraries from London to St. Louis on Cheapflights.

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

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

Reykjavik (KEF) is the most affordable one-stop option, with an average return flight price of £385.

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

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

Flights via Reykjavik (KEF) have the shortest average one-way travel time for one-stop routes: 11h 05m.

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

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

Flights via Reykjavik (KEF) offer the fastest connection on this route, with an average stopover time of 0h 55m.

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated 6 November 2025.
See what other customers who have flown with Finnair, Air Canada, andIberia from London to St. Louis have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Finnair
7.6
Good
1,335 reviews
Check prices

Entertainment

6.9

Comfort

7.4

Crew

8.1

Boarding

7.6

Overall

7.6

Food

6.7

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
Finnair
7.6
Good
1,335 reviews
Finnair
7.6
Good
1,335 reviews
Check prices

Entertainment

6.9

Comfort

7.4

Crew

8.1

Boarding

7.6

Overall

7.6

Food

6.7

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
Air Canada
7.1
Good
10,412 reviews
Finnair
7.6
Good
1,335 reviews
Check prices

Entertainment

6.9

Comfort

7.4

Crew

8.1

Boarding

7.6

Overall

7.6

Food

6.7

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
Iberia
7.0
Good
3,007 reviews
Finnair
7.6
Good
1,335 reviews
Check prices

Entertainment

6.9

Comfort

7.4

Crew

8.1

Boarding

7.6

Overall

7.6

Food

6.7

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
Lufthansa
6.8
Okay
7,555 reviews
Finnair
7.6
Good
1,335 reviews
Check prices

Entertainment

6.9

Comfort

7.4

Crew

8.1

Boarding

7.6

Overall

7.6

Food

6.7

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
British Airways
6.7
Okay
7,499 reviews
Finnair
7.6
Good
1,335 reviews
Check prices

Entertainment

6.9

Comfort

7.4

Crew

8.1

Boarding

7.6

Overall

7.6

Food

6.7

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.

Related info for your journey

Find useful and relevant information for your journey from London to St. Louis. 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 into for flights to St. Louis from London?

    Lambert-St Louis (STL) is the airport you will fly into if you book a flight from London to St. Louis. You should not have trouble finding flights to Lambert-St Louis from London; the airport handles an average of 0 inbound flights from London per day. You should also have plenty of airline options to choose from since 10 airlines have flights to the St. Louis airport from London. It is only a 12.7 mi journey from Lambert-St Louis (STL) to St. Louis’s city center.

  • How long is the flight from London to St. Louis?

    For as low as £551, Finnair can have you in St. Louis from London in 16h 40m. Airlines will cover a distance of 4186 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

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

    Our cheapest airline available from London to St. Louis is American Airlines. Our recent data shows that you can find tickets from as low as £90 on this airline. Additional options worth looking into are Scandinavian Airlines and KLM, starting at £493 and £518 round-trip. These flights start at 88% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from London to St. Louis one-way?

    To fly one-way, consider booking your trip with British Airways, which is currently one of the cheapest options available, starting at £333. Air Canada flights start at £351 while deals on Austrian Airlines start at £374 one-way.

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

    When deciding which route to take from London to St. Louis consider London Heathrow - Lambert-St Louis, London Gatwick - Lambert-St Louis or London City - Lambert-St Louis as they are the most popular.

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

    The cheapest flight price from London to St. Louis is £467. On average you can expect to pay £689. The most popular route, (London Heathrow - Lambert-St Louis), can usually be booked for £524.

  • Where are the most common stopover locations when flying from London to St. Louis?

    The most popular stopover on flights from London to St. Louis is Chicago.

  • What are some popular things to do or see while on a stopover in Chicago?

    Magnificent Mile, Grant Park, and River North are currently the most popular points of interest in Chicago at the moment. Magnificent Mile, Grant Park, and River North are located about 15.5 mi, 16.2 mi, and 15.0 mi, respectively from Chicago O'Hare Intl. Travellers in need of a car in Chicago can hire one for about £38 per day.

  • Where are the least popular stopover locations for London to St. Louis flights?

    London to St. Louis flights have a stopover in Philadelphia the least frequently.

  • Can I find deals for flights from London to St. Louis that include hotel bookings?

    Yes. In addition to deals on London to St. Louis flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from London to St. Louis?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to St. Louis.

  • Can I find deals for business class flights from London to St. Louis?

    Yes. Cheapflights offers flight deals from London to St. Louis 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 London to St. Louis?

    Currently, September is the cheapest month in which you can book a flight from London to St. Louis (average of £418). Flying from London to St. Louis in July is currently the most expensive (average of £635). 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

Browse thousands of different options on Cheapflights for your next trip

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Fly from London to St. Louis on these airlines

Choose from the following airlines for your flight from London to St. Louis. Flights are based on user searches made on Cheapflights and were last updated on 6 November 2025.
Finnair flights from London to Lambert-St Louis
British Airways flights from London to Lambert-St Louis
Virgin Atlantic flights from London to Lambert-St Louis

Top 10 airlines flying from London to St. Louis

Discover the top 10 airlines that operate flights from London to St. Louis. 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 6 November 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest£90Average£788FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Scandinavian AirlinesCheapest£493Average£638FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
KLMCheapest£518Average£866FlexibilityNo cancel feeOn-time75%
Search KLM flights
FinnairCheapest£524Average£720FlexibilityNo cancel feeOn-time76%
Search Finnair flights
Air CanadaCheapest£622Average£776FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
British AirwaysCheapest£624Average£833FlexibilityNo cancel feeOn-time70%
Search British Airways flights
United AirlinesCheapest£644Average£783FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
IberiaCheapest£644Average£741FlexibilityNo cancel feeOn-time77%
Search Iberia flights
LufthansaCheapest£712Average£833FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Virgin AtlanticCheapest£714Average£876FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic 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 London to St. Louis?

Cheapflights helps you search for flights from London to St. Louis via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

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

Millions of users choose and trust Cheapflights to book the best flight deals from London to St. Louis 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 London to St. Louis with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from London to St. Louis flexibly with Cheapflights today.

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

Not ready to book yet? You can track prices for flights from London to St. Louis on Cheapflights with our Price Alert feature and get notified when better prices are available.

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