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Cheap flights from St. Louis to London from £220

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 9/1. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LON
5 Dec — 12 Dec1
1 adult
1 adult, Economy, 0 bags

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

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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 5 November 2025.

Fri 12/1215:30STL - LGW
1 stop12h 30mMultiple Airlines
Sat 10/114:00LGW - STL
1 stop23h 50mMultiple Airlines
Deal found 4/11£440
Thu 11/1215:30STL - LGW
1 stop12h 30mMultiple Airlines
Thu 8/114:00LGW - STL
1 stop23h 50mMultiple Airlines
Deal found 3/11£441
Mon 8/1210:47STL - LGW
2 stops37h 13mMultiple Airlines
Sat 10/114:00LGW - STL
1 stop23h 50mMultiple Airlines
Deal found 4/11£443
Sat 13/1215:30STL - LGW
1 stop12h 35mMultiple Airlines
Sat 10/114:00LGW - STL
1 stop23h 50mMultiple Airlines
Deal found 3/11£444
Thu 11/1212:04STL - LGW
2 stops15h 56mMultiple Airlines
Sat 10/114:00LGW - STL
1 stop23h 50mMultiple Airlines
Deal found 4/11£448
Sat 6/1215:30STL - LGW
1 stop12h 35mMultiple Airlines
Thu 8/114:00LGW - STL
1 stop14h 33mMultiple Airlines
Deal found 4/11£451
Wed 12/1115:50STL - STN
2 stops20h 00mMultiple Airlines
Tue 18/1108:30STN - STL
2 stops35h 25mMultiple Airlines
Deal found 2/11£451
Fri 12/1215:30STL - LGW
1 stop12h 30mMultiple Airlines
Thu 8/114:00LGW - STL
1 stop23h 50mMultiple Airlines
Deal found 3/11£454
Sat 6/1215:30STL - LGW
1 stop12h 35mMultiple Airlines
Fri 9/114:00LGW - STL
2 stops26h 02mMultiple Airlines
Deal found 4/11£454
Thu 11/1215:30STL - LGW
1 stop12h 30mMultiple Airlines
Fri 9/114:00LGW - STL
2 stops26h 02mMultiple Airlines
Deal found 3/11£455
Mon 8/1210:47STL - LGW
2 stops37h 13mMultiple Airlines
Thu 8/114:00LGW - STL
1 stop14h 33mMultiple Airlines
Deal found 3/11£456
Wed 12/1115:50STL - LTN
2 stops25h 15mMultiple Airlines
Tue 18/1109:00LTN - STL
2 stops34h 55mMultiple Airlines
Deal found 2/11£465

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 5 November 2025.

Round-trip from

£440

One-way from

£220

Popular in

June

Cheapest in

October

Average price

£594

Good round-trip deal

£456 or less
12/12-10/1
  • 12/12-10/1
  • 2 total stops
  • 36h 20m total
  • St. Louis to London
Search Deals
9/1
  • 9/1
  • 3 total stops
  • 51h 58m total
  • St. Louis to London
Search Deals
Highest demand for flights based on searches. 21% potential increase in price (£150 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 November 2025
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 5 November 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 - LGW

STLLGW

Lambert-St Louis

Fri 12/12

15:30-10:00

1 stop12h 30m

London Gatwick

Sat 10/1

14:00-07:50

1 stop23h 50m

£441

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Thu 11/12

15:30-10:00

1 stop12h 30m

London Gatwick

Fri 9/1

14:00-10:02

2 stops26h 02m

£451

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Thu 11/12

15:30-10:00

1 stop12h 30m

London Gatwick

Thu 8/1

14:00-07:50

1 stop23h 50m

£454

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Mon 8/12

15:30-10:00

1 stop12h 30m

London Gatwick

Sat 10/1

14:00-07:50

1 stop23h 50m

£459

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Fri 12/12

15:30-10:00

1 stop12h 30m

London Gatwick

Fri 9/1

14:00-22:33

1 stop14h 33m

£461

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Sat 6/12

15:30-10:05

1 stop12h 35m

London Gatwick

Fri 9/1

14:00-22:33

1 stop14h 33m

£466

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Mon 8/12

15:30-10:00

1 stop12h 30m

London Gatwick

Fri 9/1

14:00-10:02

2 stops26h 02m

£468

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Sun 14/12

09:54-10:00

1 stop18h 06m

London Gatwick

Sat 10/1

14:00-07:50

1 stop23h 50m

£470

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Fri 12/12

10:42-10:00

2 stops17h 18m

London Gatwick

Thu 8/1

14:00-22:33

1 stop14h 33m

£475

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Sun 14/12

09:54-10:00

1 stop18h 06m

London Gatwick

Fri 9/1

14:00-10:02

2 stops26h 02m

£478

Flights are sorted by cheapest return flights first.

Deals found on 3/11

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 31 October 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 £405). Flying from St. Louis to London in June is currently the most expensive (average of £766). 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 5 November 2025.

It’s optimal to fly from St. Louis to London in the evening. By choosing this option you can save up to 50% on the cost of your flight, compared to a flight in the afternoon.

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 45% 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 £660.

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 Chicago (ORD) offer the fastest connection on this route, with an average stopover time of 1h 30m.

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 5 November 2025.
Read through reviews of airlines operating flights from St. Louis to London, such as KLM, Virgin Atlantic, andBritish Airways. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.7
Good
1,405 reviews
Check prices

Comfort

7.7

Boarding

7.8

Food

7.3

Entertainment

7.1

Crew

8.4

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
KLM
7.7
Good
1,405 reviews
KLM
7.7
Good
1,405 reviews
Check prices

Comfort

7.7

Boarding

7.8

Food

7.3

Entertainment

7.1

Crew

8.4

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
Virgin Atlantic
7.5
Good
671 reviews
KLM
7.7
Good
1,405 reviews
Check prices

Comfort

7.7

Boarding

7.8

Food

7.3

Entertainment

7.1

Crew

8.4

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
British Airways
6.7
Okay
7,495 reviews
KLM
7.7
Good
1,405 reviews
Check prices

Comfort

7.7

Boarding

7.8

Food

7.3

Entertainment

7.1

Crew

8.4

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

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 14h 30m. United Airlines provides one of the quickest options available for as low as £506. The distance between St. Louis and London is about 4205 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?

    British Airways, at £443, was found to be the cheapest airline from St. Louis to London.Alternate airlines flying return to your destination include Air Canada and Virgin Atlantic. Users have found that British Airways is 36% 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.

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

    While on average a flight from St. Louis to London is generally £457, our data shows the cheapest flight currently is £443. When looking at the most popular route, (Lambert-St Louis - London Heathrow), you can expect to pay £470 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, September is the cheapest month in which you can book a flight from St. Louis to London (average of £405). Flying from St. Louis to London in June is currently the most expensive (average of £766). 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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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 5 November 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£443Average£691FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Air CanadaCheapest£447Average£678FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Virgin AtlanticCheapest£483Average£723FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
KLMCheapest£518Average£820FlexibilityNo cancel feeOn-time75%
Search KLM flights

Fly with Cheapflights

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

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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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