$641+ Cheap flights from St. Louis (STL) to London, ON (YXU)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/25. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YXU
Dec 10 — Dec 171
Round-trip
1 adult, Economy
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Find cheap flights from St. Louis to London with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from St. Louis to London
Cheapest
Best
Last-minute
Cheapest flights from St. Louis to LondonExplore 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 November 10, 2026.
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 November 10, 2026.
This Kiwi.com deal was found by Cheapflights users on 11/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/256:20 pm -
1 stop18h 45m
Fri 1/16:15 am -
2 stops29h 38m
Deal found 11/10![Multiple Airlines logo]()
$641
This United Airlines deal was found by Cheapflights users on 11/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/254:05 pm -
1 stop4h 47m
Fri 1/15:30 am -
2 stops13h 48m
Deal found 11/10![United Airlines logo]()
$1,137
This Air Canada deal was found by Cheapflights users on 11/7. 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.
Mon 12/74:05 pm -
1 stop4h 47m
Wed 12/99:15 am -
1 stop7h 11m
Deal found 11/7![Air Canada logo]()
$1,200
This United Airlines deal was found by Cheapflights users on 11/7. 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.
Mon 12/74:05 pm -
1 stop4h 47m
Wed 12/93:20 pm -
2 stops8h 39m
Deal found 11/7![United Airlines logo]()
$1,299
This United Airlines deal was found by Cheapflights users on 11/8. 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.
Wed 12/234:05 pm -
1 stop4h 47m
Wed 12/305:30 am -
1 stop10h 56m
Deal found 11/8![United Airlines logo]()
$1,308
Best flights from St. Louis to LondonDiscover carefully curated flight deals from St. Louis to London that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated November 10, 2026.
Discover carefully curated flight deals from St. Louis to London that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated November 10, 2026.
This Kiwi.com deal was found by Cheapflights users on 11/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/256:20 pm -
1 stop18h 45m
Fri 1/16:15 am -
2 stops29h 38m
Deal found 11/10![Multiple Airlines logo]()
$641
This United Airlines deal was found by Cheapflights users on 11/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/254:05 pm -
1 stop4h 47m
Fri 1/15:30 am -
2 stops13h 48m
Deal found 11/10![United Airlines logo]()
$1,137
This Air Canada deal was found by Cheapflights users on 11/5. 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.
Mon 12/74:05 pm -
1 stop4h 47m
Wed 12/99:15 am -
1 stop7h 11m
Deal found 11/5![Air Canada logo]()
$1,200
This United Airlines deal was found by Cheapflights users on 11/6. 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.
Mon 12/74:05 pm -
1 stop4h 47m
Wed 12/93:20 pm -
2 stops8h 39m
Deal found 11/6![United Airlines logo]()
$1,299
This United Airlines deal was found by Cheapflights users on 11/8. 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.
Wed 12/234:05 pm -
1 stop4h 47m
Wed 12/305:30 am -
1 stop10h 56m
Deal found 11/8![United Airlines logo]()
$1,308
Last-minute flights from St. Louis to LondonDiscover last-minute flight deals from St. Louis to London. Data last updated November 10, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to London. Data last updated November 10, 2026 and is based on user searches.
This Air Canada deal was found by Cheapflights users on 11/7. 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.
Mon 12/74:05 pm -
1 stop4h 47m
Wed 12/99:15 am -
1 stop7h 11m
Deal found 11/7![Air Canada logo]()
$1,200
This United Airlines deal was found by Cheapflights users on 11/7. 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.
Mon 12/74:05 pm -
1 stop4h 47m
Wed 12/93:20 pm -
2 stops8h 39m
Deal found 11/7![United Airlines logo]()
$1,299
This United Airlines deal was found by Cheapflights users on 11/8. 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.
Wed 12/234:05 pm -
1 stop4h 47m
Wed 12/305:30 am -
1 stop10h 56m
Deal found 11/8![United Airlines logo]()
$1,308
This Kiwi.com deal was found by Cheapflights users on 11/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/256:20 pm -
1 stop18h 45m
Fri 1/16:15 am -
2 stops29h 38m
Deal found 11/10![Multiple Airlines logo]()
$641
This United Airlines deal was found by Cheapflights users on 11/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/254:05 pm -
1 stop4h 47m
Fri 1/15:30 am -
2 stops13h 48m
Deal found 11/10![United Airlines logo]()
$1,137
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 (YXU). 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 November 10, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $641 (Kiwi.com) |
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 7,457,451 searches. Data last updated November 10, 2026.
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
Cheapest round-trip
St. LouisLondon
STL Lambert-St Louis - YXU London
STLYXU
Lambert-St Louis
Fri 12/25
6:20 pm-2:05 pm
1 stop18h 45m
London
Fri 1/1
6:15 am-10:53 am
2 stops29h 38m
$641
St. LouisLondon
STL Lambert-St Louis - YXU London
STLYXU
Lambert-St Louis
Fri 12/25
4:05 pm-9:52 pm
1 stop4h 47m
London
Fri 1/1
5:30 am-6:18 pm
2 stops13h 48m
$1,137
Quickest round-trip
St. LouisLondon
STL Lambert-St Louis - YXU London
STLYXU
Lambert-St Louis
Mon 12/7
4:05 pm-9:52 pm
1 stop4h 47m
London
Wed 12/9
9:15 am-3:26 pm
1 stop7h 11m
$1,200
St. LouisLondon
STL Lambert-St Louis - YXU London
STLYXU
Lambert-St Louis
Mon 12/7
4:05 pm-9:52 pm
1 stop4h 47m
London
Wed 12/9
3:20 pm-10:59 pm
2 stops8h 39m
$1,299
St. LouisLondon
STL Lambert-St Louis - YXU London
STLYXU
Lambert-St Louis
Wed 12/23
4:05 pm-9:52 pm
1 stop4h 47m
London
Wed 12/30
5:30 am-3:26 pm
1 stop10h 56m
$1,308
Sorted by cheapest first
Compare providers for flights from St. Louis to London
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to London in November.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on St. Louis-London, Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-London, Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-London, Ontario flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on St. Louis-London, Ontario flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-London, Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
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.
STL-YXU
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.
Related info for your journey
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