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Cheap flights from St. Louis to London from £257

STL — LON
4 Nov — 11 Nov1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Lambert-St Louis to London are usually found in January or February, booked 73 days in advance, depart on a Wednesday or Tuesday and return on a Friday

Cheap flight deals from St. Louis to London

Enter your travel dates to find the best prices.

Cheapest flights from St. Louis to London

Wed 18/1115:40 -
2 stops23h 45m
Tue 24/1118:20 -
2 stops25h 25m
Deal found 4/10£669
Wed 18/1116:05 -
1 stop10h 25m
Wed 25/1118:00 -
1 stop27h 26m
Deal found 4/10£693
Wed 18/1116:05 -
1 stop13h 15m
Wed 25/1109:00 -
2 stops36h 26m
Deal found 4/10£714
Sat 14/1116:26 -
2 stops23h 09m
Sat 21/1106:00 -
2 stops23h 59m
Deal found 30/9£717
Wed 2/1212:53 -
1 stop15h 07m
Wed 9/1207:35 -
2 stops17h 18m
Deal found 1/10£718
Wed 18/1112:29 -
1 stop13h 21m
Wed 25/1111:45 -
2 stops18h 11m
Deal found 30/9£721
Wed 2/1216:05 -
1 stop10h 25m
Wed 9/1206:30 -
1 stop13h 15m
Deal found 1/10£723
Mon 30/1112:29 -
2 stops21h 31m
Fri 11/1206:40 -
2 stops23h 25m
Deal found 1/10£728
Mon 7/1216:05 -
1 stop10h 25m
Mon 14/1218:00 -
1 stop27h 26m
Deal found 3/10£730
Tue 13/1014:40 -
2 stops20h 55m
Tue 20/1022:00 -
2 stops21h 25m
Deal found 1/10£783
Fri 27/1113:14 -
2 stops21h 51m
Fri 4/1206:45 -
2 stops15h 58m
Deal found 2/10£827
Wed 4/1116:05 -
2 stops17h 15m
Sun 8/1120:00 -
3 stops33h 16m
Deal found 2/10£843

Find flight deals from St. Louis to London

Round-trip from

£550

One-way from

£257

Popular in

June

Cheapest in

January

Average price

£706
Air Canada
  • Air Canada
  • 11/1-14/1
  • 4 total stops
  • 104h 16m total
  • St. Louis to London
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British Airways
  • British Airways
  • 30/3-31/12
  • Nonstop
  • 8h 00m total
  • St. Louis to London
Search Deals
Highest demand for flights based on searches. 22% potential increase in price (£159 potential increase over avg. return price).
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Cheapest flight prices on average. 4% potential price decrease (£23 potential savings vs. average return price).
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Average for round-trip flights in October 2026
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Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

St. LouisLondon

STL Lambert-St Louis - LHR London Heathrow

STLLHR

Lambert-St Louis

Mon 1/3

10:30-07:45

2 stops15h 15m

London Heathrow

Wed 31/12

00:00-17:00

Nonstop0h 00m

£267

St. LouisLondon

STL Lambert-St Louis - LHR London Heathrow

STLLHR

Lambert-St Louis

Tue 5/1

15:07-10:15

1 stop13h 08m

London Heathrow

Wed 31/12

00:00-17:00

Nonstop0h 00m

£267

St. LouisLondon

STL Lambert-St Louis - LHR London Heathrow

STLLHR

Lambert-St Louis

Sun 3/1

06:00-07:20

2 stops19h 20m

London Heathrow

Wed 31/12

00:00-17:00

Nonstop0h 00m

£267

St. LouisLondon

STL Lambert-St Louis - LHR London Heathrow

STLLHR

Lambert-St Louis

Mon 1/3

11:25-06:40

2 stops13h 15m

London Heathrow

Wed 31/12

00:00-17:00

Nonstop0h 00m

£267

St. LouisLondon

STL Lambert-St Louis - STN London Stansted

STLSTN

Lambert-St Louis

Sun 7/2

15:40-20:05

2 stops22h 25m

London Stansted

Wed 31/12

00:00-17:00

Nonstop0h 00m

£289
Fastest return journey

St. LouisLondon

STL Lambert-St Louis - LHR London Heathrow

STLLHR

Lambert-St Louis

Fri 2/4

21:35-11:35

Nonstop8h 00m

London Heathrow

Wed 31/12

00:00-17:00

Nonstop0h 00m

£302

St. LouisLondon

STL Lambert-St Louis - LHR London Heathrow

STLLHR

Lambert-St Louis

Fri 2/4

06:30-10:00

2 stops21h 30m

London Heathrow

Wed 31/12

00:00-17:00

Nonstop0h 00m

£304

St. LouisLondon

STL Lambert-St Louis - LHR London Heathrow

STLLHR

Lambert-St Louis

Fri 1/1

07:18-06:40

2 stops17h 22m

London Heathrow

Wed 31/12

00:00-17:00

Nonstop0h 00m

£305

St. LouisLondon

STL Lambert-St Louis - STN London Stansted

STLSTN

Lambert-St Louis

Wed 11/11

18:34-08:05

3 stops31h 31m

London Stansted

Wed 31/12

00:00-17:00

Nonstop0h 00m

£319

St. LouisLondon

STL Lambert-St Louis - STN London Stansted

STLSTN

Lambert-St Louis

Mon 9/11

18:34-08:15

3 stops31h 41m

London Stansted

Wed 31/12

00:00-17:00

Nonstop0h 00m

£319

Flights are sorted by cheapest return flights first.

Deals found on 2/10

Showing 1-10 of 36 resultsSorted by cheapest first
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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

Cheapflights Insights

Everything you need to know about your flight from St. Louis to London

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

Currently, April is the cheapest month in which you can book a flight from St. Louis to London (average of £588). Flying from St. Louis to London in June is currently the most expensive (average of £1,089). 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?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from St. Louis to London as you normally would.

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

Airfare is below average for this route at the moment.
St. Louis to London flights typically cost between £586 and £807 in January.
The cheapest return price found within the last 5 days was £550 on Air Canada (11 Jan–14 Jan).

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

Chicago (ORD) – chosen by Cheapflights users on 80% of one-stop itineraries from St. Louis to London on Cheapflights.

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

Chicago (ORD) is the most affordable one-stop option, with an average return flight price of £623.

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

Flights via Atlanta (ATL) have the shortest average one-way travel time for one-stop routes: 10h 23m.

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

Flights via Atlanta (ATL) offer the fastest connection on this route, with an average stopover time of 1h 22m.

How often are flights from St. Louis to London delayed?

About 18% of weekly flights between St. Louis and London have experienced delays in the past year, with the average delay time being 114 minutes.

What is the most punctual flight time for St. Louis to London flights?

Historically, flights departing in the evening are less likely to be delayed, whereas flights leaving at night tend to experience delays more often.

What day of the week experiences the fewest flight delays on this route?

Monday tends to have the lowest number of delays on this route, whereas Wednesday has historically faced a higher average of delays compared to other days of the week.

Which airline has the best punctuality record on St. Louis to London flights?

Over the past year, British Airways have had the lowest number of delays on this route, with just 18% of flights being delayed.

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

Booking 1 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.

Related info for your journey

  • 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 2 outbound flights to London per day from 0 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 11h 15m. United Airlines provides one of the quickest options available for as low as £720. 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 most popular routes from St. Louis to London?

    While some choose either Lambert-St Louis - London Gatwick or Lambert-St Louis - London Stansted, Lambert-St Louis - London Heathrow is the most popular route from St. Louis to London.

  • What are the most reliable airlines from St. Louis to London?

    The top 3 most reliable airlines when flying from St. Louis to London are American Airlines (71%), Aer Lingus (71%) and Finnair (71%).

  • 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, April is the cheapest month in which you can book a flight from St. Louis to London (average of £588). Flying from St. Louis to London in June is currently the most expensive (average of £1,089). 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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