$260+ Cheap flights from Pierre Elliott Trudeau Intl (YUL) to St. Louis (STL)
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 10/8. Fares are subject to change and may not be available on all flights or dates of travel.
YUL — STL
Oct 9 — Oct 161
Round-trip
1 adult, Economy
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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
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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 Pierre Elliott Trudeau Intl to St. Louis
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Cheapest flights from Pierre Elliott Trudeau Intl to St. LouisExplore the most affordable flight options available from Pierre Elliott Trudeau Intl to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 9, 2026.
Explore the most affordable flight options available from Pierre Elliott Trudeau Intl to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 9, 2026.
This Air Canada deal was found by Cheapflights users on 9/8. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/154:55 pm -
Nonstop2h 46m
Tue 10/2012:10 pm -
Nonstop2h 31m
Deal found 9/8![Air Canada logo]()
$477
This Air Canada deal was found by Cheapflights users on 9/8. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/74:10 pm -
1 stop5h 10m
Wed 10/1412:10 pm -
Nonstop2h 31m
Deal found 9/8![Air Canada logo]()
$478
This Air Canada deal was found by Cheapflights users on 9/8. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/2510:10 am -
1 stop4h 50m
Mon 9/2812:10 pm -
Nonstop2h 31m
Deal found 9/8![Air Canada logo]()
$479
This American Airlines deal was found by Cheapflights users on 9/3. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/2310:32 am -
1 stop11h 20m
Tue 11/38:15 pm -
1 stop14h 10m
Deal found 9/3![American Airlines logo]()
$494
This lol.travel deal was found by Cheapflights users on 9/5. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/14:55 pm -
Nonstop2h 46m
Sun 10/412:10 pm -
Nonstop2h 31m
Deal found 9/5![Air Canada logo]()
$498
This Air Canada deal was found by Cheapflights users on 9/8. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/84:55 pm -
Nonstop2h 46m
Tue 10/138:55 am -
1 stop5h 26m
Deal found 9/8![Air Canada logo]()
$530
Best flights from Pierre Elliott Trudeau Intl to St. LouisDiscover carefully curated flight deals from Pierre Elliott Trudeau Intl to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 9, 2026.
Discover carefully curated flight deals from Pierre Elliott Trudeau Intl to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 9, 2026.
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/29:25 am -
1 stop8h 28m
Wed 2/37:30 am -
1 stop8h 37m
Deal found 9/7![United Airlines logo]()
$535
This LATAM Airlines 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 LATAM Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/810:10 am -
1 stop4h 50m
Tue 10/139:30 am -
1 stop11h 36m
Deal found 9/6![Multiple Airlines logo]()
$546
This Delta deal was found by Cheapflights users on 9/4. 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.
Thu 11/197:10 am -
1 stop10h 21m
Sat 11/215:30 pm -
1 stop5h 26m
Deal found 9/4![Delta logo]()
$556
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/286:00 am -
1 stop10h 43m
Sat 10/313:15 pm -
1 stop5h 02m
Deal found 9/6![United Airlines logo]()
$547
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/87:00 am -
2 stops9h 43m
Tue 11/109:40 am -
2 stops11h 02m
Deal found 9/6![United Airlines logo]()
$547
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/206:00 am -
1 stop7h 10m
Sun 11/226:00 am -
1 stop6h 28m
Deal found 9/6![United Airlines logo]()
$547
This United Airlines deal was found by Cheapflights users on 9/5. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/226:00 am -
1 stop5h 32m
Fri 11/276:00 am -
1 stop7h 00m
Deal found 9/5![United Airlines logo]()
$548
This United Airlines deal was found by Cheapflights users on 9/5. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/217:00 am -
2 stops8h 34m
Sat 11/287:30 am -
1 stop12h 47m
Deal found 9/5![United Airlines logo]()
$548
This United Airlines deal was found by Cheapflights users on 9/5. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/207:00 am -
2 stops8h 34m
Sun 11/296:00 am -
1 stop7h 00m
Deal found 9/5![United Airlines logo]()
$548
Last-minute flights from Pierre Elliott Trudeau Intl to St. LouisDiscover last-minute flight deals from Pierre Elliott Trudeau Intl to St. Louis. Data last updated September 9, 2026 and is based on user searches.
Discover last-minute flight deals from Pierre Elliott Trudeau Intl to St. Louis. Data last updated September 9, 2026 and is based on user searches.
This Air Canada deal was found by Cheapflights users on 9/8. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/2510:10 am -
1 stop4h 50m
Mon 9/2812:10 pm -
Nonstop2h 31m
Deal found 9/8![Air Canada logo]()
$479
This lol.travel deal was found by Cheapflights users on 9/5. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/14:55 pm -
Nonstop2h 46m
Sun 10/412:10 pm -
Nonstop2h 31m
Deal found 9/5![Air Canada logo]()
$498
This Air Canada deal was found by Cheapflights users on 9/8. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/74:10 pm -
1 stop5h 10m
Wed 10/1412:10 pm -
Nonstop2h 31m
Deal found 9/8![Air Canada logo]()
$478
This Air Canada deal was found by Cheapflights users on 9/8. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/84:55 pm -
Nonstop2h 46m
Tue 10/138:55 am -
1 stop5h 26m
Deal found 9/8![Air Canada logo]()
$530
This Air Canada deal was found by Cheapflights users on 9/8. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/154:55 pm -
Nonstop2h 46m
Tue 10/2012:10 pm -
Nonstop2h 31m
Deal found 9/8![Air Canada logo]()
$477
This American Airlines deal was found by Cheapflights users on 9/3. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/2310:32 am -
1 stop11h 20m
Tue 11/38:15 pm -
1 stop14h 10m
Deal found 9/3![American Airlines logo]()
$494
One-way flights from Pierre Elliott Trudeau Intl to St. LouisSearch for one-way flight options from Pierre Elliott Trudeau Intl to St. Louis. Find affordable one-way fares based on user searches. Data last updated September 9, 2026.
Search for one-way flight options from Pierre Elliott Trudeau Intl to St. Louis. Find affordable one-way fares based on user searches. Data last updated September 9, 2026.
This Air Canada deal was found by Cheapflights users on 9/8. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/84:55 pm -
Nonstop2h 46m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![Air Canada logo]()
$260
This American Airlines deal was found by Cheapflights users on 9/4. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2212:30 pm -
1 stop12h 49m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/4![American Airlines logo]()
$268
This Air Canada deal was found by Cheapflights users on 9/8. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/224:55 pm -
Nonstop2h 46m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![Air Canada logo]()
$284
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/2411:23 am -
2 stops10h 58m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/6![United Airlines logo]()
$303
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/155:45 pm -
3 stops44h 36m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/6![Multiple Airlines logo]()
$308
Find flight deals from Pierre Elliott Trudeau Intl to St. Louis
Discover tips and strategies to find the most affordable flight options for your journey from Pierre Elliott Trudeau Intl (YUL) to St. Louis (STL). 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 9, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $477 (Air Canada) |
One-way from | $260 (Air Canada) |
Popular in | January |
Cheapest in | August |
Average price | $598 |
Good round-trip deal | $550 or less |
Good one-way deal | $311 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Pierre Elliott Trudeau Intl to St. Louis 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 9, 2026.
Use the filters below to find and compare flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
MontrealSt. Louis
YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis
YULSTL
Montreal Pierre Elliott Trudeau Intl
Thu 10/8
4:55 pm-6:41 pm
Nonstop2h 46m
Lambert-St Louis
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$260
MontrealSt. Louis
YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis
YULSTL
Montreal Pierre Elliott Trudeau Intl
Thu 10/22
4:55 pm-6:41 pm
Nonstop2h 46m
Lambert-St Louis
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$284
MontrealSt. Louis
YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis
YULSTL
Montreal Pierre Elliott Trudeau Intl
Sat 10/24
6:10 am-9:21 pm
1 stop16h 11m
Lambert-St Louis
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$303
MontrealSt. Louis
YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis
YULSTL
Montreal Pierre Elliott Trudeau Intl
Tue 2/2
9:25 am-4:53 pm
1 stop8h 28m
Lambert-St Louis
Wed 2/3
7:30 am-5:07 pm
1 stop8h 37m
$535
MontrealSt. Louis
YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis
YULSTL
Montreal Pierre Elliott Trudeau Intl
Thu 10/8
10:10 am-2:00 pm
1 stop4h 50m
Lambert-St Louis
Tue 10/13
9:30 am-10:06 pm
1 stop11h 36m
$546
MontrealSt. Louis
YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis
YULSTL
Montreal Pierre Elliott Trudeau Intl
Wed 10/28
6:00 am-3:43 pm
1 stop10h 43m
Lambert-St Louis
Sat 10/31
3:15 pm-9:17 pm
1 stop5h 02m
$547
MontrealSt. Louis
YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis
YULSTL
Montreal Pierre Elliott Trudeau Intl
Sun 11/8
7:00 am-3:43 pm
2 stops9h 43m
Lambert-St Louis
Tue 11/10
9:40 am-9:42 pm
2 stops11h 02m
$547
MontrealSt. Louis
YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis
YULSTL
Montreal Pierre Elliott Trudeau Intl
Fri 11/20
6:00 am-12:10 pm
1 stop7h 10m
Lambert-St Louis
Sun 11/22
6:00 am-1:28 pm
1 stop6h 28m
$547
MontrealSt. Louis
YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis
YULSTL
Montreal Pierre Elliott Trudeau Intl
Sun 11/22
6:00 am-10:32 am
1 stop5h 32m
Lambert-St Louis
Fri 11/27
6:00 am-2:00 pm
1 stop7h 00m
$548
MontrealSt. Louis
YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis
YULSTL
Montreal Pierre Elliott Trudeau Intl
Sat 11/21
7:00 am-2:34 pm
2 stops8h 34m
Lambert-St Louis
Sat 11/28
7:30 am-9:17 pm
1 stop12h 47m
$548
Showing 1-10 of 12 resultsSorted by cheapest first
- Most accurate provider: When it comes to deals on Montreal Pierre Elliott Trudeau Intl Airport-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Montreal Pierre Elliott Trudeau Intl Airport-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Montreal Pierre Elliott Trudeau Intl Airport-St. Louis flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Montreal Pierre Elliott Trudeau Intl Airport-St. Louis 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 Montreal Pierre Elliott Trudeau Intl Airport-St. Louis 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 Pierre Elliott Trudeau Intl to St. Louis
Have a flexible travel schedule? Discover the best time to fly to St. Louis from Pierre Elliott Trudeau Intl with our price prediction graph.
YUL-STL
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 Montreal Pierre Elliott Trudeau Intl Airport to St. Louis
What is the cheapest month to book a flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis?
Currently, August is the cheapest month in which you can book a flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis (average of $442). Flying from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis in January is currently the most expensive (average of $889). 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 YUL to STL?
Find hourly flight availability from Pierre Elliott Trudeau Intl to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 9, 2026.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis as you normally would.
The best insider tips for Montreal Pierre Elliott Trudeau Intl Airport to St. Louis flights
AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Montreal Pierre Elliott Trudeau Intl Airport to St. Louis trip
Our travel experts
Reviews of airlines servicing St. Louis
Get insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated September 9, 2026.
Peruse reviews from past customers who have flown with Air Canada from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
7.8
Overall
7.1
Boarding
7.3
Entertainment
6.8
Comfort
7.1
Food
6.3
Reviews
1 / 20
8.0
ExcellentMicheline,Aug 2026
YUL - LAX
Crew
7.8
Overall
7.1
Boarding
7.3
Entertainment
6.8
Comfort
7.1
Food
6.3
Reviews
1 / 20
8.0
ExcellentMicheline,Aug 2026
YUL - LAX
Related info for your journey
Find useful and relevant information for your journey from Pierre Elliott Trudeau Intl to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near St. Louis?
Book flights to St. Louis if you plan to visit one of these locationsFairview Heights
O'Fallon
Fenton
Swansea
Eureka
Maryland Heights
Collinsville
Wentzville
Edwardsville
Glencoe
Chesterfield
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Pierre Elliott Trudeau Intl and St. Louis flights
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Top airline flying from Pierre Elliott Trudeau Intl to St. Louis
Discover the top airline that operate flights from Pierre Elliott Trudeau Intl to St. Louis. 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 7,457,451 searches. Data last updated September 9, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$498 | Average$567 | FlexibilityNo cancel fee | On-time67% |