$137 Cheap Flights from St. Louis (STL) to Toronto (YYZ)

View $137 flight on Sat, Sep 20, 2025Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Toronto Pearson Intl. Airport (YYZ)

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Cheap Flights from St. Louis to Toronto (STL-YYZ)

Prices were available within the past 7 days and start at $137 for one-way flights and $332 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Thu, Aug 7 - Thu, Aug 14
STL
St. Louis
YYZ
Toronto
$332 Roundtrip, found 6 days ago
$332
Roundtrip
found 6 days ago
Select American Airlines flight, departing Thu, Aug 7 from St. Louis to Toronto, returning Thu, Aug 14, priced at $332 found 6 days ago
American Airlines
Wed, Aug 6 - Tue, Aug 12
STL
St. Louis
YYZ
Toronto
$334 Roundtrip, found 6 days ago
$334
Roundtrip
found 6 days ago
Select American Airlines flight, departing Wed, Aug 6 from St. Louis to Toronto, returning Tue, Aug 12, priced at $334 found 6 days ago
American Airlines
Thu, Nov 6 - Wed, Nov 12
STL
St. Louis
YYZ
Toronto
$336 Roundtrip, found 6 days ago
$336
Roundtrip
found 6 days ago
Select American Airlines flight, departing Thu, Nov 6 from St. Louis to Toronto, returning Wed, Nov 12, priced at $336 found 6 days ago
American Airlines
Tue, Aug 26 - Thu, Aug 28
STL
St. Louis
YYZ
Toronto
$338 Roundtrip, found 15 hours ago
$338
Roundtrip
found 15 hours ago
Select American Airlines flight, departing Tue, Aug 26 from St. Louis to Toronto, returning Thu, Aug 28, priced at $338 found 15 hours ago
American Airlines
Thu, Aug 14 - Thu, Sep 4
STL
St. Louis
YYZ
Toronto
$339 Roundtrip, found 2 days ago
$339
Roundtrip
found 2 days ago
Select American Airlines flight, departing Thu, Aug 14 from St. Louis to Toronto, returning Thu, Sep 4, priced at $339 found 2 days ago
American Airlines
Sat, Nov 8 - Fri, Nov 14
STL
St. Louis
YYZ
Toronto
$341 Roundtrip, found 6 days ago
$341
Roundtrip
found 6 days ago
Select American Airlines flight, departing Sat, Nov 8 from St. Louis to Toronto, returning Fri, Nov 14, priced at $341 found 6 days ago
Delta
Wed, Aug 6 - Tue, Aug 12
STL
St. Louis
YYZ
Toronto
$355 Roundtrip, found 6 days ago
$355
Roundtrip
found 6 days ago
Select Delta flight, departing Wed, Aug 6 from St. Louis to Toronto, returning Tue, Aug 12, priced at $355 found 6 days ago
Air Canada
Tue, Jul 29 - Thu, Aug 28
STL
St. Louis
YYZ
Toronto
$362 Roundtrip, found 2 days ago
$362
Roundtrip
found 2 days ago
Select Air Canada flight, departing Tue, Jul 29 from St. Louis to Toronto, returning Thu, Aug 28, priced at $362 found 2 days ago
United
Sun, Jul 20 - Tue, Jul 22
STL
St. Louis
YYZ
Toronto
$416 Roundtrip, found 1 day ago
$416
Roundtrip
found 1 day ago
Select United flight, departing Sun, Jul 20 from St. Louis to Toronto, returning Tue, Jul 22, priced at $416 found 1 day ago
Alaska Airlines
Sun, Oct 19 - Sun, Oct 26
STL
St. Louis
YYZ
Toronto
$549 Roundtrip, found 6 hours ago
$549
Roundtrip
found 6 hours ago
Select Alaska Airlines flight, departing Sun, Oct 19 from St. Louis to Toronto, returning Sun, Oct 26, priced at $549 found 6 hours ago

Find the cheapest month to fly from St. Louis (STL) to Toronto (YYZ)

June is typically the cheapest month to fly

From $357 - $590 per traveler.

Graph displaying average flight prices per month

Alternative airports near Toronto

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Billy Bishop Toronto City YTZ. Cheapest and Closest option available. Average driving time to city center is 4 minutes. Flights from $429
YTZ
Billy Bishop Toronto City
CheapestClosest
Average driving time to city center4 min
Flights from $429
0
Flights from St. Louis (STL) to Toronto (YYZ)
Origin airport
Lambert-St. Louis Intl.
Destination airport
Pearson Intl.
Airlines serving
Air Canada, American Airlines, Delta, United, WestJet
Roundtrip price
$332
Distance
654 mi

St. Louis to Toronto Flights

The cheapest times to fly from St. Louis to Toronto

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from St. Louis to Toronto are during the month of August. You can find some of the cheapest flights from St. Louis to Toronto with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from St. Louis to Toronto

Sunday is one of the best days to book for cheap flights from St. Louis to Toronto: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from St. Louis to Toronto

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from St. Louis to Toronto in 2025. You can also book with separate airlines for your outbound and return journeys, from $137 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap St. Louis to Toronto flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your St. Louis to Toronto airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Pearson Intl. Airport (YYZ) cost?
Cheap round-trip flights from Lambert-St. Louis Intl. Airport (STL) to Pearson Intl. Airport (YYZ) start at $392. This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a Air Canada flight leaving STL on August 6 2025 and touching down at YYZ. The price was last updated on July 10 2025 and has not changed since.
What is the cheapest month to fly from STL to YYZ?
The cheapest flights from STL to YYZ are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Lambert-St. Louis Intl. Airport (STL) to Pearson Intl. Airport (YYZ)?
Take a direct flight with Air Canada and fly straight from Lambert-St. Louis Intl. Airport (STL) to Pearson Intl. Airport (YYZ).
What is the cheapest airline that flies from STL to YYZ?
At the moment, the cheapest carrier offering one-way flights from STL to YYZ is Air Canada. You can take off on this route from $205. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from STL on October 1 2025. Prices were last updated on July 10 2025 and have not changed since.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Pearson Intl. Airport (YYZ)?
On average, just 1 direct flight departs each day from Lambert-St. Louis Intl. Airport (STL) to Pearson Intl. Airport (YYZ). Want additional options? Use our filter tool to discover flights with layovers and explore a new city along the way.
What are the most popular departure times for flights from Lambert-St. Louis Intl. Airport (STL) to Pearson Intl. Airport (YYZ)?
More travelers fly between STL and YYZ at 3 PM than at any other point in the day. Prefer a quieter experience? Pick a flight outside the busiest times and there's a chance you'll save on your fare as well.
What day of the week has the most flights from STL to YYZ?
If you jet off on a Friday, you'll get the biggest range of options for flights from Lambert-St. Louis Intl. Airport (STL) to Pearson Intl. Airport (YYZ).
What is the earliest flight from Lambert-St. Louis Intl. Airport (STL) to Pearson Intl. Airport (YYZ)?
Take the earliest flight at around 3:50PM UTC-6, departing from Lambert-St. Louis Intl. Airport (STL). You'll be flying for roughly 1h 55m, arriving at Pearson Intl. Airport (YYZ) at approximately 6:45PM UTC-5.
How long does it take to fly from Lambert-St. Louis Intl. Airport (STL) to Pearson Intl. Airport (YYZ)?
It takes around 1 hour and 55 minutes to travel the 650 mi from STL to YYZ.
What airline has the least delays from STL to YYZ?
Air Canada has the best performance for on-time direct flights from Lambert-St. Louis Intl. Airport (STL) to Pearson Intl. Airport (YYZ), with an on-time score of 85%. Use the Expedia App to look up your flight status before you take off and get notified of any trip changes.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to Pearson Intl. Airport (YYZ)?
To avoid potential delays on the Lambert-St. Louis Intl. Airport (STL) to Pearson Intl. Airport (YYZ) route, aim to fly before 3 PM. Flights after this time are 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for Toronto from Lambert-St. Louis Intl. Airport (STL)?
Explore your flight options from Lambert-St. Louis Intl. Airport (STL) to Pearson Intl. Airport (YYZ). This is the only Toronto airport you can land at if you're taking a direct flight.
Is it cheaper to buy a plane ticket from Lambert-St. Louis Intl. Airport (STL) to Pearson Intl. Airport (YYZ) last-minute?
Booking your ticket from STL to YYZ shortly before your trip is usually more expensive. But if you're flexible with your departure times and dates, you could snag a cheap last-minute fare.
Is it cheaper to book a STL to YYZ flight and hotel package?
Compared with arranging flights and hotels separately, booking a STL to YYZ flight and hotel package with Expedia could result in significant savings. Better still, having everything in one easy place will take the stress out of planning your trip. Just pick your flights and choose from our wide range of stays, then tailor your trip with extras like activities, tours and car rentals.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Pearson Intl. Airport (YYZ)?
Typically, you can cancel or reschedule your STL to YYZ flight. However, additional fees may apply, especially if your booking was made over 24 hours ago. Double-check your itinerary for the airline's fees and rules on flight changes, or if you'd like more information, go to our Customer Service portal.

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