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Cheap flights from London to St. Louis from £289

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 21/8. Fares are subject to change and may not be available on all flights or dates of travel.
LON — STL
16 Jul — 23 Jul1
1 adult

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 Wednesday or Monday and return on a Wednesday

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 11 July 2025.

Round-trip from

£630

One-way from

£289

Popular in

December

Cheapest in

March

Average price

£861
United Airlines
  • United Airlines
  • 14/9-17/9
  • 4 total stops
  • 54h 59m total
  • London to St. Louis
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21/8
  • 21/8
  • 1 total stop
  • 30h 21m total
  • London to St. Louis
Search Deals
Highest demand for flights based on searches. 3% potential increase in price (£16 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£20 potential savings vs. average return price).
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Average for round-trip flights in July 2025
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Find flight deals from London to St. Louis

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 11 July 2025.

Sun 14/907:45LHR - STL
2 stops21h 59mUnited Airlines
Wed 17/906:00STL - LHR
2 stops33h 00mUnited Airlines
Deal found 9/7£630
Mon 11/814:00LGW - STL
1 stop15h 47mMultiple Airlines
Tue 19/808:00STL - LGW
1 stop20h 00mMultiple Airlines
Deal found 9/7£630
Sat 6/1217:00LHR - STL
2 stops36h 39mScandinavian Airlines
Thu 15/111:51STL - LHR
2 stops27h 49mScandinavian Airlines
Deal found 9/7£639
Wed 3/1212:15LHR - STL
2 stops17h 30mMultiple Airlines
Thu 15/112:24STL - LHR
2 stops16h 26mMultiple Airlines
Deal found 9/7£641
Tue 9/906:50LHR - STL
2 stops14h 28mAir Canada
Wed 8/1013:30STL - LHR
1 stop11h 00mAir Canada
Deal found 11/7£695
Tue 25/1106:00LHR - STL
2 stops23h 44mAustrian Airlines
Mon 1/1212:31STL - LHR
2 stops40h 19mAustrian Airlines
Deal found 10/7£697
Sat 6/1213:30LHR - STL
1 stop30h 25mLufthansa
Thu 15/112:24STL - LHR
1 stop16h 01mLufthansa
Deal found 9/7£705
Tue 25/1112:35LHR - STL
1 stop13h 25mBritish Airways
Mon 1/1217:57STL - LHR
1 stop11h 43mBritish Airways
Deal found 9/7£706
Mon 1/912:20LGW - STL
2 stops17h 27mAmerican Airlines
Mon 15/908:23STL - LGW
2 stops17h 47mAmerican Airlines
Deal found 9/7£718
Thu 4/1209:40LCY - STL
2 stops20h 05mLufthansa
Mon 8/1218:45STL - LCY
2 stops16h 55mLufthansa
Deal found 9/7£723
Thu 4/1208:40LCY - STL
2 stops17h 55mDelta
Mon 8/1214:18STL - LCY
2 stops13h 12mDelta
Deal found 8/7£789
Wed 6/812:00LGW - STL
2 stops17h 20mDelta
Wed 13/810:45STL - LGW
2 stops17h 15mDelta
Deal found 9/7£790

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 11 July 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

Sun 14/9

07:45-23:44

2 stops21h 59m

Lambert-St Louis

Wed 17/9

06:00-21:00

2 stops33h 00m

£630

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Mon 11/8

14:00-23:47

1 stop15h 47m

Lambert-St Louis

Tue 19/8

08:00-10:00

1 stop20h 00m

£630

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sat 6/12

17:00-23:39

2 stops36h 39m

Lambert-St Louis

Thu 15/1

11:51-21:40

2 stops27h 49m

£639

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 3/12

12:15-23:45

2 stops17h 30m

Lambert-St Louis

Thu 15/1

12:24-10:50

2 stops16h 26m

£641

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 9/9

06:50-15:18

2 stops14h 28m

Lambert-St Louis

Wed 8/10

13:30-06:30

1 stop11h 00m

£695

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 25/11

06:00-23:44

2 stops23h 44m

Lambert-St Louis

Mon 1/12

12:31-10:50

2 stops40h 19m

£697

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sat 6/12

13:30-13:55

1 stop30h 25m

Lambert-St Louis

Thu 15/1

12:24-10:25

1 stop16h 01m

£705

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 25/11

12:35-20:00

1 stop13h 25m

Lambert-St Louis

Mon 1/12

17:57-11:40

1 stop11h 43m

£706

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Mon 1/9

12:20-23:47

2 stops17h 27m

Lambert-St Louis

Mon 15/9

08:23-08:10

2 stops17h 47m

£718

LondonSt. Louis

LCY - STL

LCYSTL

London City

Thu 4/12

09:40-23:45

2 stops20h 05m

Lambert-St Louis

Mon 8/12

18:45-17:40

2 stops16h 55m

£723

Flights are sorted by cheapest return flights first.

Deals found on 9/7

Showing 1-10 of 36 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 27 June 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, February is the cheapest month in which you can book a flight from London to St. Louis (average of £722). Flying from London to St. Louis in December is currently the most expensive (average of £1,033). 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 11 July 2025.

It’s typically best to fly out from London to St. Louis in the evening. Doing so could potentially save you 16% on the flight price compared to flying in the morning, 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 30 June 2024.

Travellers seeking maximum savings on their London to St. Louis flight should consider departing on Tuesday evenings when fares are most often at their lowest. Sunday at midday 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?

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 11 July 2025.
See what other customers who have flown with Delta, KLM, andAustrian Airlines 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.
Delta
8.0
Very Good
7,951 reviews
Check prices

Boarding

8.2

Food

7.3

Comfort

7.9

Crew

8.5

Overall

8.0

Entertainment

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Delta
8.0
Very Good
7,951 reviews
Delta
8.0
Very Good
7,951 reviews
Check prices

Boarding

8.2

Food

7.3

Comfort

7.9

Crew

8.5

Overall

8.0

Entertainment

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
KLM
7.8
Good
1,372 reviews
Delta
8.0
Very Good
7,951 reviews
Check prices

Boarding

8.2

Food

7.3

Comfort

7.9

Crew

8.5

Overall

8.0

Entertainment

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Austrian Airlines
7.6
Good
811 reviews
Delta
8.0
Very Good
7,951 reviews
Check prices

Boarding

8.2

Food

7.3

Comfort

7.9

Crew

8.5

Overall

8.0

Entertainment

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
United Airlines
7.4
Good
8,846 reviews
Delta
8.0
Very Good
7,951 reviews
Check prices

Boarding

8.2

Food

7.3

Comfort

7.9

Crew

8.5

Overall

8.0

Entertainment

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Virgin Atlantic
7.4
Good
654 reviews
Delta
8.0
Very Good
7,951 reviews
Check prices

Boarding

8.2

Food

7.3

Comfort

7.9

Crew

8.5

Overall

8.0

Entertainment

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.

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.

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

    Our cheapest airline available from London to St. Louis is United Airlines. Our recent data shows that you can find tickets from as low as £630 on this airline. Additional options worth looking into are Scandinavian Airlines and Air Canada, starting at £639 and £695 round-trip. These flights start at 10% 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 WestJet, which is currently one of the cheapest options available, starting at £542. Lufthansa flights start at £693 while deals on Aer Lingus start at £768 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.

  • 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?

    Grant Park, Magnificent Mile, and North Pier Apartments are currently the most popular points of interest in Chicago at the moment. Grant Park, Magnificent Mile, and North Pier Apartments are located about 16.2 mi, 15.5 mi, and 16.1 mi, respectively from Chicago O'Hare Intl. Travellers in need of a car in Chicago can hire one for about £33 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, February is the cheapest month in which you can book a flight from London to St. Louis (average of £722). Flying from London to St. Louis in December is currently the most expensive (average of £1,033). 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

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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 11 July 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 11 July 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest£171Average£756FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Scandinavian AirlinesCheapest£473Average£612FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
FinnairCheapest£504Average£632FlexibilityNo cancel feeOn-time76%
Search Finnair flights
United AirlinesCheapest£617Average£843FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
IberiaCheapest£618Average£711FlexibilityNo cancel feeOn-time77%
Search Iberia flights
British AirwaysCheapest£621Average£793FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£627Average£842FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
LufthansaCheapest£668Average£813FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
KLMCheapest£708Average£870FlexibilityNo cancel feeOn-time75%
Search KLM flights
Air CanadaCheapest£715Average£839FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Fly with Cheapflights

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

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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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