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Cheap flights from St. Louis to London from £199

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 27/7. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LON
9 Jul — 16 Jul1
1 adult

Cheapflights Tip: The best prices from Lambert-St Louis to London are usually found in April or October, booked 51 days in advance, depart on a Wednesday or Saturday and return on a Wednesday

Cheap 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 4 July 2025.

Round-trip from

£531

One-way from

£199

Popular in

June

Cheapest in

April

Average price

£864
United Airlines
  • United Airlines
  • 16/9-27/9
  • 3 total stops
  • 35h 52m total
  • St. Louis to London
27/7
  • 27/7
  • 2 total stops
  • 41h 13m total
  • St. Louis to London
Highest demand for flights based on searches. 20% potential increase in price (£126 potential increase over avg. return price).
Cheapest flight prices on average. 4% potential price decrease (£20 potential savings vs. average return price).
Average for round-trip flights in July 2025

Find flight deals from St. Louis to London

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 4 July 2025.

Tue 16/908:10STL - LHR
2 stops19h 25mUnited Airlines
Sat 27/909:30LHR - STL
1 stop16h 27mUnited Airlines
Deal found 3/7£531
Wed 17/913:30STL - LHR
2 stops13h 05mAir Canada
Sat 27/909:30LHR - STL
2 stops16h 08mAir Canada
Deal found 3/7£533
Tue 16/911:04STL - LHR
2 stops15h 46mDelta
Wed 14/111:30LHR - STL
2 stops18h 10mDelta
Deal found 3/7£536
Fri 1/819:38STL - LHR
1 stop12h 47mBritish Airways
Fri 8/815:10LHR - STL
1 stop14h 04mBritish Airways
Deal found 2/7£538
Thu 31/717:23STL - LHR
1 stop14h 07mVirgin Atlantic
Thu 7/811:45LHR - STL
2 stops15h 49mVirgin Atlantic
Deal found 3/7£541
Thu 2/1009:15STL - LGW
3 stops29h 25mMultiple Airlines
Mon 6/1021:20LGW - STL
3 stops23h 58mMultiple Airlines
Deal found 3/7£543
Sun 9/1118:43STL - LHR
2 stops17h 52mLufthansa
Sat 15/1108:45LHR - STL
2 stops35h 10mLufthansa
Deal found 2/7£547
Sun 10/809:15STL - STN
3 stops28h 40mMultiple Airlines
Tue 26/807:05STN - STL
2 stops18h 55mMultiple Airlines
Deal found 2/7£552
Thu 4/913:21STL - LHR
2 stops26h 19mScandinavian Airlines
Tue 16/907:05LHR - STL
3 stops20h 55mScandinavian Airlines
Deal found 3/7£560
Fri 11/717:14STL - LHR
1 stop11h 16mAmerican Airlines
Fri 25/713:10LHR - STL
1 stop13h 09mAmerican Airlines
Deal found 3/7£568
Wed 27/811:29STL - LCY
2 stops14h 41mDelta
Mon 8/907:45LCY - STL
2 stops17h 16mDelta
Deal found 2/7£572
Mon 25/814:30STL - LTN
3 stops24h 05mMultiple Airlines
Sat 30/806:05LTN - STL
3 stops37h 27mMultiple Airlines
Deal found 3/7£578

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 4 July 2025.
Use the filters below to find and compare flights from St. Louis to London that are best for you.

Fly from

St. Louis

Fly to

London

Route

Depart

Return

Price

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 16/9

08:10-09:35

2 stops19h 25m

London Heathrow

Sat 27/9

09:30-19:57

1 stop16h 27m

£531

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 17/9

13:30-08:35

2 stops13h 05m

London Heathrow

Sat 27/9

09:30-19:38

2 stops16h 08m

£533

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 16/9

11:04-08:50

2 stops15h 46m

London Heathrow

Wed 14/1

11:30-23:40

2 stops18h 10m

£536

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 1/8

19:38-14:25

1 stop12h 47m

London Heathrow

Fri 8/8

15:10-23:14

1 stop14h 04m

£538

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 31/7

15:41-11:25

2 stops13h 44m

London Heathrow

Thu 7/8

09:40-21:34

2 stops17h 54m

£541

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Thu 2/10

09:15-20:40

3 stops29h 25m

London Gatwick

Mon 6/10

21:20-15:18

3 stops23h 58m

£543

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 9/11

18:43-15:50

2 stops15h 07m

London Heathrow

Sat 15/11

08:45-13:55

2 stops35h 10m

£547

St. LouisLondon

STL - STN

STLSTN

Lambert-St Louis

Sun 10/8

09:15-19:55

3 stops28h 40m

London Stansted

Tue 26/8

07:05-20:00

2 stops18h 55m

£552

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 4/9

13:21-21:40

2 stops26h 19m

London Heathrow

Tue 16/9

07:05-22:00

3 stops20h 55m

£560

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Wed 27/8

11:29-08:10

2 stops14h 41m

London City

Mon 8/9

07:45-19:01

2 stops17h 16m

£572

Flights are sorted by cheapest return flights first.

Deals found on 3/7

Showing 1-10 of 37 results
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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 27 June 2025.

Booking 51 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, January is the cheapest month in which you can book a flight from St. Louis to London (average of £112). Flying from St. Louis to London in August is currently the most expensive (average of £164). 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 4 July 2025.

It’s optimal to fly from St. Louis to London in the morning. By choosing this option you can save up to 45% on the cost of your flight, compared to a flight in the evening.

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 4 July 2025.
Read through reviews of airlines operating flights from St. Louis to London, such as Delta, KLM, andMalaysia Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Entertainment

7.9

Overall

8.0

Comfort

7.9

Crew

8.5

Boarding

8.2

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
8.0
Very Good

Entertainment

7.9

Overall

8.0

Comfort

7.9

Crew

8.5

Boarding

8.2

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Entertainment

7.9

Overall

8.0

Comfort

7.9

Crew

8.5

Boarding

8.2

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Entertainment

7.9

Overall

8.0

Comfort

7.9

Crew

8.5

Boarding

8.2

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Entertainment

7.9

Overall

8.0

Comfort

7.9

Crew

8.5

Boarding

8.2

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Entertainment

7.9

Overall

8.0

Comfort

7.9

Crew

8.5

Boarding

8.2

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection 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 5 airlines. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.

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

    United Airlines, at £531, was found to be the cheapest airline from St. Louis to London.Alternate airlines flying return to your destination include Air Canada and Delta. Users have found that United Airlines is 22% cheaper than the other options available to this destination.

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

    The cheapet airlines for a one-way flight from St. Louis to London are Air Canada (£289), United Airlines (£292), and Delta (£306).

  • What are the most popular routes 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, January is the cheapest month in which you can book a flight from St. Louis to London (average of £112). Flying from St. Louis to London in August is currently the most expensive (average of £164). 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 St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Hounslow
Croydon
Milton Keynes
Deal
Gatwick
Luton
Slough
Wembley
Crawley
Eastbourne
Ilford
Hayes
Folkestone
Southend-on-Sea
Watford
Ipswich
Winchester
Maidstone
Guildford
Chichester

Browse thousands of different options on Cheapflights for your next trip

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Top 5 airlines flying from St. Louis to London

Discover the top 5 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 4 July 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest£490Average£680FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
British AirwaysCheapest£491Average£749FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£515Average£794FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
KLMCheapest£521Average£785FlexibilityNo cancel feeOn-time75%
Search KLM flights
American AirlinesCheapest£574Average£980FlexibilityNo cancel feeOn-time71%
Search American 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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