$834+ 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 10/25. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YXU
Oct 11 — Oct 181
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 September 11, 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 September 11, 2026.
This Air Canada deal was found by Cheapflights users on 9/9. 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.
Sun 10/258:26 am -
2 stops10h 26m
Sun 11/13:25 pm -
2 stops8h 59m
Deal found 9/9![Air Canada logo]()
$834
This Air Canada deal was found by Cheapflights users on 9/6. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/222:40 pm -
1 stop4h 00m
Mon 10/263:25 pm -
2 stops7h 15m
Deal found 9/6![Air Canada logo]()
$951
This oojo deal was found by Cheapflights users on 9/7. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/226:47 am -
2 stops21h 33m
Thu 10/297:40 am -
2 stops26h 29m
Deal found 9/7![WestJet logo]()
$978
This Air Canada deal was found by Cheapflights users on 9/7. 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.
Thu 10/228:55 am -
1 stop4h 55m
Thu 10/299:15 am -
1 stop7h 08m
Deal found 9/7![Air Canada logo]()
$986
This Air Canada deal was found by Cheapflights users on 9/10. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/274:05 pm -
1 stop4h 42m
Sun 1/39:15 am -
1 stop7h 11m
Deal found 9/10![Air Canada logo]()
$1,008
This United Airlines deal was found by Cheapflights users on 9/10. 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.
Thu 10/2210:27 am -
2 stops10h 13m
Mon 10/263:25 pm -
2 stops7h 15m
Deal found 9/10![United Airlines logo]()
$1,010
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 September 11, 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 September 11, 2026.
This Air Canada deal was found by Cheapflights users on 9/9. 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.
Sun 10/258:26 am -
2 stops10h 26m
Sun 11/13:25 pm -
2 stops8h 59m
Deal found 9/9![Air Canada logo]()
$834
This oojo deal was found by Cheapflights users on 9/7. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/226:47 am -
2 stops21h 33m
Thu 10/297:40 am -
2 stops26h 29m
Deal found 9/7![WestJet logo]()
$978
This United Airlines deal was found by Cheapflights users on 9/10. 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.
Thu 10/2210:27 am -
2 stops10h 13m
Mon 10/263:25 pm -
2 stops7h 15m
Deal found 9/10![United Airlines logo]()
$1,010
This Air Canada deal was found by Cheapflights users on 9/6. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/222:40 pm -
1 stop4h 00m
Mon 10/263:25 pm -
2 stops7h 15m
Deal found 9/6![Air Canada logo]()
$951
This Air Canada deal was found by Cheapflights users on 9/7. 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.
Thu 10/228:55 am -
1 stop4h 55m
Thu 10/299:15 am -
1 stop7h 08m
Deal found 9/7![Air Canada logo]()
$986
This Air Canada deal was found by Cheapflights users on 9/10. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/274:05 pm -
1 stop4h 42m
Sun 1/39:15 am -
1 stop7h 11m
Deal found 9/10![Air Canada logo]()
$1,008
Last-minute flights from St. Louis to LondonDiscover last-minute flight deals from St. Louis to London. Data last updated September 11, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to London. Data last updated September 11, 2026 and is based on user searches.
This Air Canada deal was found by Cheapflights users on 9/6. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/222:40 pm -
1 stop4h 00m
Mon 10/263:25 pm -
2 stops7h 15m
Deal found 9/6![Air Canada logo]()
$951
This oojo deal was found by Cheapflights users on 9/7. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/226:47 am -
2 stops21h 33m
Thu 10/297:40 am -
2 stops26h 29m
Deal found 9/7![WestJet logo]()
$978
This Air Canada deal was found by Cheapflights users on 9/7. 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.
Thu 10/228:55 am -
1 stop4h 55m
Thu 10/299:15 am -
1 stop7h 08m
Deal found 9/7![Air Canada logo]()
$986
This United Airlines deal was found by Cheapflights users on 9/10. 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.
Thu 10/2210:27 am -
2 stops10h 13m
Mon 10/263:25 pm -
2 stops7h 15m
Deal found 9/10![United Airlines logo]()
$1,010
This Air Canada deal was found by Cheapflights users on 9/9. 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.
Sun 10/258:26 am -
2 stops10h 26m
Sun 11/13:25 pm -
2 stops8h 59m
Deal found 9/9![Air Canada logo]()
$834
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 September 11, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $834 (Air Canada) |
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 September 11, 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
Sun 10/25
8:26 am-7:52 pm
2 stops10h 26m
London
Sun 11/1
3:25 pm-11:24 pm
2 stops8h 59m
$834
Quickest round-trip
St. LouisLondon
STL Lambert-St Louis - YXU London
STLYXU
Lambert-St Louis
Thu 10/22
2:40 pm-7:40 pm
1 stop4h 00m
London
Mon 10/26
3:25 pm-9:40 pm
2 stops7h 15m
$951
St. LouisLondon
STL Lambert-St Louis - YXU London
STLYXU
Lambert-St Louis
Thu 10/22
6:47 am-5:20 am
2 stops21h 33m
London
Thu 10/29
7:40 am-9:09 am
2 stops26h 29m
$978
St. LouisLondon
STL Lambert-St Louis - YXU London
STLYXU
Lambert-St Louis
Thu 10/22
8:55 am-2:50 pm
1 stop4h 55m
London
Thu 10/29
9:15 am-3:23 pm
1 stop7h 08m
$986
St. LouisLondon
STL Lambert-St Louis - YXU London
STLYXU
Lambert-St Louis
Sun 12/27
4:05 pm-9:47 pm
1 stop4h 42m
London
Sun 1/3
9:15 am-3:26 pm
1 stop7h 11m
$1,008
St. LouisLondon
STL Lambert-St Louis - YXU London
STLYXU
Lambert-St Louis
Thu 10/22
10:27 am-9:40 pm
2 stops10h 13m
London
Mon 10/26
3:25 pm-9:40 pm
2 stops7h 15m
$1,010
Sorted by cheapest first
- 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
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.
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