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$199+ Cheap flights from St. Louis (STL) to London (LON)

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 7/16. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LON
jun. 17 — jun. 241
mar. 6/17
mar. 6/24
1 adult, Economy
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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 Thursday 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 junio 12, 2025.

Round-trip from

$738
(Air Canada)

One-way from

$199
(Norse)

Popular in

June

Cheapest in

April

Average price

$1,317
From Lambert-St Louis to London (LON)
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One-way flight from Lambert-St Louis to London (LON)
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Highest demand for flights based on searches. 19% potential increase in price ($223 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($35 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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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 junio 12, 2025.

This Air Canada deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 8/199:15 amSTL - LHR
2 stops15h 15mAir Canada
jue. 8/286:50 amLHR - STL
2 stops14h 31mAir Canada
Deal found 6/9$738
This Delta deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 8/201:26 pmSTL - LHR
1 stop18h 04mDelta
mié. 8/276:15 amLHR - STL
2 stops16h 30mDelta
Deal found 6/10$742
This United Airlines deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/2111:39 amSTL - LHR
1 stop12h 16mUnited Airlines
mar. 10/281:30 pmLHR - STL
1 stop30h 25mUnited Airlines
Deal found 6/12$746
This Mytrip deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/128:44 amSTL - LGW
3 stops28h 46mMultiple Airlines
dom. 9/211:05 pmLGW - STL
2 stops24h 44mMultiple Airlines
Deal found 6/11$747
This Iberia deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/231:53 pmSTL - LHR
2 stops24h 52mIberia
mié. 10/85:10 pmLHR - STL
2 stops36h 39mIberia
Deal found 6/11$748
This Cheapflightsfares deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 7/145:27 pmSTL - LHR
1 stop13h 18mBritish Airways
lun. 7/2112:30 pmLHR - STL
1 stop13h 54mBritish Airways
Deal found 6/11$749
This Mytrip deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 8/59:15 amSTL - STN
3 stops21h 25mMultiple Airlines
mar. 8/192:50 pmSTN - STL
2 stops35h 10mMultiple Airlines
Deal found 6/12$750
This Gotogate deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 9/79:15 amSTL - LHR
2 stops15h 15mMultiple Airlines
dom. 9/146:50 amLHR - STL
2 stops19h 07mMultiple Airlines
Deal found 6/11$752
This Delta deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 7/2310:30 amSTL - LGW
2 stops17h 30mDelta
sáb. 8/212:00 pmLGW - STL
2 stops17h 20mDelta
Deal found 6/10$754
This Scandinavian Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/143:42 pmSTL - LHR
2 stops18h 18mScandinavian Airlines
mié. 8/207:05 amLHR - STL
3 stops20h 57mScandinavian Airlines
Deal found 6/10$771
This Lufthansa deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 9/103:30 pmSTL - LHR
1 stop13h 10mLufthansa
lun. 9/226:30 pmLHR - STL
2 stops27h 14mLufthansa
Deal found 6/10$778
This Virgin Atlantic deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 7/257:11 pmSTL - LHR
1 stop12h 19mVirgin Atlantic
vie. 8/19:40 amLHR - STL
2 stops18h 02mVirgin Atlantic
Deal found 6/11$787

Cheapflights Fare Finder

Customize 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 2,558,603 searches. Data last updated junio 12, 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

mar. 8/19

9:15 am-6:30 am

2 stops15h 15m

London Heathrow

jue. 8/28

6:50 am-3:21 pm

2 stops14h 31m

$738

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

mié. 8/20

1:26 pm-1:30 pm

1 stop18h 04m

London Heathrow

mié. 8/27

6:15 am-4:45 pm

2 stops16h 30m

$742

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

lun. 7/14

5:27 pm-12:45 pm

1 stop13h 18m

London Heathrow

lun. 7/21

12:30 pm-8:24 pm

1 stop13h 54m

$748

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

mié. 9/3

4:05 pm-10:00 am

1 stop11h 55m

London Heathrow

dom. 9/7

6:50 am-7:57 pm

2 stops19h 07m

$750

St. LouisLondon

STL - STN

STLSTN

Lambert-St Louis

mar. 8/5

9:15 am-12:40 pm

3 stops21h 25m

London Stansted

mar. 8/19

2:50 pm-8:00 pm

2 stops35h 10m

$750

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

mié. 7/23

10:30 am-10:00 am

2 stops17h 30m

London Gatwick

sáb. 8/2

12:00 pm-11:20 pm

2 stops17h 20m

$754

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

vie. 8/29

5:32 pm-2:25 pm

1 stop14h 53m

London Heathrow

jue. 9/4

10:50 am-11:48 pm

2 stops18h 58m

$770

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

jue. 8/14

3:42 pm-4:00 pm

2 stops18h 18m

London Heathrow

mié. 8/20

7:05 am-10:02 pm

3 stops20h 57m

$771

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

lun. 7/14

9:15 am-6:30 am

2 stops15h 15m

London Heathrow

lun. 7/21

8:30 am-6:07 pm

1 stop15h 37m

$774

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

mié. 9/10

3:30 pm-10:40 am

1 stop13h 10m

London Heathrow

lun. 9/22

6:30 pm-3:44 pm

2 stops27h 14m

$778

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

Showing 1-10 of 41 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 round-trip 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 round-trip flight from St. Louis to London. Price data was last updated on June 9, 2025.

The best time to book flights from St. Louis to London is 51 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, November is the cheapest month in which you can book a flight from St. Louis to London (average of $661). Flying from St. Louis to London in June is currently the most expensive (average of $1,108). 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 junio 12, 2025.

It’s optimal to fly from St. Louis to London in the morning. By choosing this option you can save up to 5% on the cost of your flight, compared to a flight at noon.

Rainfall in London by month

Plan your trip to London by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in London ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit London when rainfall is around 1.6 in.

Temperature in London by month

Plan your trip to London by taking into account the average temperature totals by month.

If weather is an important factor for your trip to London, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

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 junio 12, 2025.
Read reviews from past customers who have flown Delta, KLM and Austrian Airlines from St. Louis to London. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,946 reviews

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Overall

8.0

Food

7.3

Crew

8.5

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!
Delta
8.0
Very good
7,946 reviews
Delta
8.0
Very good
7,946 reviews

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Overall

8.0

Food

7.3

Crew

8.5

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!
KLM
7.8
Good
1,358 reviews
Delta
8.0
Very good
7,946 reviews

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Overall

8.0

Food

7.3

Crew

8.5

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!
Austrian Airlines
7.6
Good
802 reviews
Delta
8.0
Very good
7,946 reviews

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Overall

8.0

Food

7.3

Crew

8.5

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!
Air France
7.5
Good
1,463 reviews
Delta
8.0
Very good
7,946 reviews

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Overall

8.0

Food

7.3

Crew

8.5

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!
United Airlines
7.4
Good
8,790 reviews
Delta
8.0
Very good
7,946 reviews

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Overall

8.0

Food

7.3

Crew

8.5

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?

    Lambert-St Louis (STL) is the airport you will fly out of if you book a flight from St. Louis to London. You should not have trouble finding flights to London from Lambert-St Louis; the airport handles an average of 0 outbound flights to London per day. You should also have plenty of airline options to choose from since 10 airlines have flights from the St. Louis airport to London. It is only a 12.7 mi journey to Lambert-St Louis (STL) from St. Louis’s city center.

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

    According to our current data, Air Canada ($738), Delta ($742), and British Airways ($748) offers the cheapest pricing from St. Louis to London. These flights start at 21% lower than the current average price 3 months from now.

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

    The cheapest airline one-way is Air Canada, with whom users have recently found tickets for as low as $424. However, be on the lookout for offers from United Airlines and Delta, as they are both options that can get you from St. Louis to London for a low price.

  • What are the most popular routes from St. Louis to London?

    The most popular flight routes from St. Louis to London are Lambert-St Louis - London Heathrow, Lambert-St Louis - London Gatwick and Lambert-St Louis - London City.

  • 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 vacation 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, November is the cheapest month in which you can book a flight from St. Louis to London (average of $661). Flying from St. Louis to London in June is currently the most expensive (average of $1,108). 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

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Hayes
Hounslow
Thornton Heath
Luton
Canterbury
Harrow
Dover
Gatwick
Orpington
Watford
Croydon
Folkestone
Borehamwood
Sutton
Aylesbury
Chelmsford
Brentwood
Chichester
Wembley
Arundel

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Alternative routes for St. Louis to London

See prices for flight routes from nearby airports that may be better suited for you.
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Top 10 airlines flying from St. Louis to London

Discover the top 10 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 2,558,603 searches. Data last updated junio 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$651Average$915FlexibilityNo cancel feeOn-time71%
Scandinavian AirlinesCheapest$669Average$1,102FlexibilityNo cancel feeOn-time77%
IberiaCheapest$671Average$981FlexibilityNo cancel feeOn-time77%
Air CanadaCheapest$691Average$1,001FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$702Average$973FlexibilityNo cancel feeOn-time69%
Virgin AtlanticCheapest$703Average$913FlexibilityNo cancel feeOn-time72%
British AirwaysCheapest$704Average$975FlexibilityNo cancel feeOn-time70%
DeltaCheapest$713Average$992FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$725Average$1,085FlexibilityNo cancel feeOn-time76%
KLMCheapest$726Average$896FlexibilityNo cancel feeOn-time75%

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