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Cheap flights from St. Louis to London from £182

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 21/1. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LON
9 Jan — 16 Jan1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from Lambert-St Louis to London are usually found in November or October, booked 81 days in advance, depart on a Thursday or Tuesday and return on a Saturday

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 10 December 2025.

Mon 8/1211:50STL - LHR
2 stops14h 35mIberia
Mon 15/1219:05LHR - STL
2 stops31h 19mIberia
Deal found 7/12£497
Mon 8/1213:00STL - LHR
1 stop10h 55mMultiple Airlines
Mon 15/1210:25LHR - STL
1 stop12h 38mMultiple Airlines
Deal found 7/12£514
Thu 11/1206:30STL - LHR
2 stops18h 40mMultiple Airlines
Tue 16/1207:25LHR - STL
1 stop15h 38mMultiple Airlines
Deal found 6/12£528
Thu 11/1218:42STL - LHR
1 stop10h 33mLufthansa
Tue 16/1210:25LHR - STL
1 stop12h 38mLufthansa
Deal found 6/12£529
Thu 11/1210:45STL - LHR
2 stops14h 05mVirgin Atlantic
Tue 16/1209:40LHR - STL
2 stops17h 07mVirgin Atlantic
Deal found 6/12£535
Fri 12/1213:35STL - LHR
1 stop14h 05mUnited Airlines
Sun 14/1218:00LHR - STL
2 stops29h 03mUnited Airlines
Deal found 8/12£557
Fri 12/1216:05STL - LHR
1 stop13h 15mMultiple Airlines
Sun 14/1218:00LHR - STL
1 stop27h 29mMultiple Airlines
Deal found 8/12£561
Tue 16/1213:00STL - LHR
1 stop12h 55mLufthansa
Tue 23/1207:25LHR - STL
1 stop15h 02mLufthansa
Deal found 8/12£613
Tue 16/1216:05STL - LHR
1 stop10h 25mAir Canada
Tue 23/1213:25LHR - STL
2 stops32h 04mAir Canada
Deal found 8/12£631
Thu 11/1210:56STL - LCY
2 stops21h 09mBritish Airways
Thu 18/1207:15LCY - STL
2 stops19h 36mBritish Airways
Deal found 9/12£634
Tue 16/1211:25STL - LHR
2 stops13h 05mMultiple Airlines
Tue 23/1213:25LHR - STL
2 stops32h 04mMultiple Airlines
Deal found 8/12£635
Mon 8/1211:50STL - LGW
2 stops17h 00mIberia
Mon 15/1219:40LGW - STL
2 stops30h 44mIberia
Deal found 7/12£648

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 10 December 2025.

Round-trip from

£492

One-way from

£182

Popular in

June

Cheapest in

November

Average price

£788
United Airlines
  • United Airlines
  • 20/4-1/5
  • 4 total stops
  • 37h 26m total
  • St. Louis to London
Search Deals
21/1
  • 21/1
  • 1 total stop
  • 34h 18m total
  • St. Louis to London
Search Deals
Highest demand for flights based on searches. 24% potential increase in price (£160 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£23 potential savings vs. average return price).
Search Deals
Average for round-trip flights in December 2025
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 10 December 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 - LCY

STLLCY

Lambert-St Louis

Mon 16/3

18:34-17:40

2 stops18h 06m

London City

Wed 25/3

09:50-23:51

2 stops19h 01m

£492

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 18/1

09:57-07:10

2 stops15h 13m

London Heathrow

Wed 1/4

06:30-13:30

1 stop13h 00m

£493

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 27/3

16:05-20:00

2 stops46h 55m

London Heathrow

Tue 7/4

09:30-16:40

2 stops37h 10m

£498

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Wed 1/4

15:30-18:35

1 stop21h 05m

London City

Fri 10/4

09:15-22:59

2 stops19h 44m

£500

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 22/4

22:00-12:05

Nonstop8h 05m

London Heathrow

Wed 29/4

16:25-19:30

Nonstop9h 05m

£501

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Tue 31/3

18:35-18:35

2 stops18h 00m

London City

Wed 8/4

09:15-22:59

2 stops19h 44m

£503

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Wed 11/3

11:22-09:00

2 stops16h 38m

London Gatwick

Fri 20/3

11:20-08:35

2 stops26h 15m

£516

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Wed 11/3

12:15-17:40

2 stops24h 25m

London City

Wed 18/3

09:50-23:51

2 stops19h 01m

£519

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 28/1

13:00-08:45

2 stops13h 45m

London Heathrow

Mon 2/2

11:45-20:43

2 stops14h 58m

£520

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 23/1

10:19-08:05

2 stops15h 46m

London Heathrow

Fri 30/1

10:00-20:43

2 stops16h 43m

£520

Flights are sorted by cheapest return flights first.

Deals found on 7/12

Showing 1-10 of 60 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 5 December 2025.

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, September is the cheapest month in which you can book a flight from St. Louis to London (average of £398). Flying from St. Louis to London in June is currently the most expensive (average of £752). 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 10 December 2025.

It’s optimal to fly from St. Louis to London in the morning. By choosing this option you can save up to 26% on the cost of your flight, compared to a flight in the afternoon.

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 44% 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 £555.

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 10m.

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 Minneapolis (MSP) offer the fastest connection on this route, with an average stopover time of 1h 29m.

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 10 December 2025.
Read through reviews of airlines operating flights from St. Louis to London, such as KLM and British Airways. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.7
Good
1,431 reviews
Check prices

Comfort

7.6

Food

7.2

Crew

8.3

Entertainment

7.1

Boarding

7.8

Overall

7.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
KLM
7.7
Good
1,431 reviews
KLM
7.7
Good
1,431 reviews
Check prices

Comfort

7.6

Food

7.2

Crew

8.3

Entertainment

7.1

Boarding

7.8

Overall

7.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
British Airways
6.7
Okay
7,573 reviews
KLM
7.7
Good
1,431 reviews
Check prices

Comfort

7.6

Food

7.2

Crew

8.3

Entertainment

7.1

Boarding

7.8

Overall

7.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle

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 4 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 8h 05m. Lufthansa provides one of the quickest options available for as low as £501. 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?

    KLM, at £369, was found to be the cheapest airline from St. Louis to London.Alternate airlines flying return to your destination include Virgin Atlantic and British Airways. Users have found that KLM is 44% 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 City, 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, September is the cheapest month in which you can book a flight from St. Louis to London (average of £398). Flying from St. Louis to London in June is currently the most expensive (average of £752). 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
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Browse thousands of different options on Cheapflights for your next trip

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Top 4 airlines flying from St. Louis to London

Discover the top 4 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 10 December 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest£369Average£552FlexibilityNo cancel feeOn-time75%
Search KLM flights
Virgin AtlanticCheapest£412Average£586FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£435Average£665FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Air CanadaCheapest£439Average£665FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Fly with Cheapflights

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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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