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Cheap flights from Toronto to St. Louis from C$ 237

YTO — STL
7 Oct — 14 Oct1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Toronto to St. Louis

Enter your travel dates to find the best prices.

Cheapest flights from Toronto to St. Louis

Wed 14/107:29 a.m. -
1 stop10h 24m
Mon 19/105:00 a.m. -
1 stop8h 33m
Deal found 2/9C$ 430
Tue 20/107:29 a.m. -
1 stop10h 24m
Tue 27/107:28 a.m. -
1 stop9h 16m
Deal found 2/9C$ 441
Thu 22/101:15 p.m. -
1 stop8h 42m
Mon 26/105:00 a.m. -
1 stop8h 33m
Deal found 3/9C$ 445
Thu 1/106:30 a.m. -
1 stop7h 46m
Thu 8/105:00 a.m. -
1 stop8h 33m
Deal found 3/9C$ 448
Wed 7/107:29 a.m. -
1 stop10h 24m
Fri 16/107:29 a.m. -
1 stop9h 15m
Deal found 3/9C$ 455
Wed 7/107:29 a.m. -
1 stop10h 24m
Fri 9/107:29 a.m. -
1 stop9h 15m
Deal found 2/9C$ 466
Fri 2/106:30 a.m. -
1 stop7h 46m
Wed 7/105:00 a.m. -
1 stop8h 33m
Deal found 2/9C$ 469
Wed 30/96:30 a.m. -
1 stop7h 46m
Fri 2/105:00 a.m. -
1 stop8h 32m
Deal found 2/9C$ 480
Fri 2/106:30 a.m. -
1 stop7h 46m
Fri 9/105:00 a.m. -
1 stop8h 33m
Deal found 2/9C$ 493
Mon 19/107:45 a.m. -
1 stop16h 28m
Mon 26/106:35 p.m. -
2 stops52h 20m
Deal found 3/9C$ 499
Sat 17/104:50 p.m. -
1 stop7h 23m
Sat 24/104:30 p.m. -
1 stop20h 40m
Deal found 5/9C$ 522

Find flight deals from Toronto to St. Louis

Round-trip from

C$ 430

One-way from

C$ 237

Popular in

March

Cheapest in

October

Average price

C$ 926

Good round-trip deal

C$ 642 or less
American Airlines
  • American Airlines
  • 14/10-19/10
  • 2 total stops
  • 18h 57m total
  • Toronto to St. Louis
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27/10-31/12
  • 27/10-31/12
  • 2 total stops
  • 33h 05m total
  • Toronto to St. Louis
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Highest demand for flights based on searches. 18% potential increase in price (C$ 221 potential increase over avg. RT price).
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Cheapest flight prices on average. 7% potential price decrease (C$ 71 potential savings vs. average RT price).
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Average for round-trip flights in September 2026
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Price to beat on a round-trip flight from Toronto (YTO) to Lambert-St Louis.
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Cheapflights Fare Finder

 
Use the filters below to find and compare flights from Toronto to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

TorontoSt. Louis

YYZ Toronto Pearson Intl - STL Lambert-St Louis

YYZSTL

Toronto Pearson Intl

Tue 20/10

9:50 a.m.-5:40 p.m.

2 stops32h 50m

Lambert-St Louis

Wed 31/12

12:00 a.m.-1:00 a.m.

Nonstop0h 00m

C$ 248

TorontoSt. Louis

YYZ Toronto Pearson Intl - STL Lambert-St Louis

YYZSTL

Toronto Pearson Intl

Thu 5/11

11:36 a.m.-7:22 p.m.

1 stop8h 46m

Lambert-St Louis

Wed 31/12

12:00 a.m.-1:00 a.m.

Nonstop0h 00m

C$ 261

TorontoSt. Louis

YYZ Toronto Pearson Intl - STL Lambert-St Louis

YYZSTL

Toronto Pearson Intl

Tue 20/10

11:40 a.m.-6:16 p.m.

1 stop7h 36m

Lambert-St Louis

Wed 31/12

12:00 a.m.-1:00 a.m.

Nonstop0h 00m

C$ 270

TorontoSt. Louis

YYZ Toronto Pearson Intl - STL Lambert-St Louis

YYZSTL

Toronto Pearson Intl

Wed 16/9

4:45 p.m.-1:21 p.m.

2 stops21h 36m

Lambert-St Louis

Wed 31/12

12:00 a.m.-1:00 a.m.

Nonstop0h 00m

C$ 281

TorontoSt. Louis

YYZ Toronto Pearson Intl - STL Lambert-St Louis

YYZSTL

Toronto Pearson Intl

Fri 2/10

1:15 p.m.-8:44 p.m.

1 stop8h 29m

Lambert-St Louis

Wed 31/12

12:00 a.m.-1:00 a.m.

Nonstop0h 00m

C$ 286

TorontoSt. Louis

YYZ Toronto Pearson Intl - STL Lambert-St Louis

YYZSTL

Toronto Pearson Intl

Mon 7/12

2:25 p.m.-7:09 a.m.

2 stops41h 44m

Lambert-St Louis

Wed 31/12

12:00 a.m.-1:00 a.m.

Nonstop0h 00m

C$ 344

TorontoSt. Louis

YYZ Toronto Pearson Intl - STL Lambert-St Louis

YYZSTL

Toronto Pearson Intl

Wed 7/10

11:09 a.m.-8:32 p.m.

1 stop10h 23m

Lambert-St Louis

Wed 31/12

12:00 a.m.-1:00 a.m.

Nonstop0h 00m

C$ 353

TorontoSt. Louis

YYZ Toronto Pearson Intl - STL Lambert-St Louis

YYZSTL

Toronto Pearson Intl

Sun 27/9

6:30 a.m.-1:10 p.m.

2 stops31h 40m

Lambert-St Louis

Wed 31/12

12:00 a.m.-1:00 a.m.

Nonstop0h 00m

C$ 362

TorontoSt. Louis

YYZ Toronto Pearson Intl - STL Lambert-St Louis

YYZSTL

Toronto Pearson Intl

Tue 27/10

11:40 a.m.-6:16 p.m.

1 stop7h 36m

Lambert-St Louis

Wed 31/12

12:00 a.m.-1:00 a.m.

Nonstop0h 00m

C$ 369
Quickest round-trip

TorontoSt. Louis

YYZ Toronto Pearson Intl - STL Lambert-St Louis

YYZSTL

Toronto Pearson Intl

Thu 5/11

2:10 p.m.-3:26 p.m.

Nonstop2h 16m

Lambert-St Louis

Wed 31/12

12:00 a.m.-1:00 a.m.

Nonstop0h 00m

C$ 382

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/9

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

Best time to book a flight from Toronto to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Toronto with our price prediction graph.
Estimated round-trip price

Cheapflights Insights

Everything you need to know about your flight from Toronto to St. Louis

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

Currently, January is the cheapest month in which you can book a flight from Toronto to St. Louis (average of C$ 580). Flying from Toronto to St. Louis in April is currently the most expensive (average of C$ 844). 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 YTO to STL?

Unlike in the afternoon, when flights are generally more expensive, you can save up to 36% on flights from Toronto to St. Louis by exploring options for tickets at noon.

How much does it cost to fly round-trip from Toronto to St. Louis?

Airfare is below average for this route at the moment.
Toronto to St. Louis flights typically cost between C$ 872 and C$ 989 in October.
The cheapest round-trip price found within the last 5 days was C$ 430 on American Airlines (14 Oct-19 Oct).

What’s the top layover airport for flights from Toronto to St. Louis?

Chicago (ORD) – chosen by Cheapflights users on 78% of one-stop itineraries from Toronto to St. Louis on Cheapflights.

What’s the cheapest layover airport for flights from Toronto to St. Louis?

Chicago (ORD) is the most affordable 1-stop option, with an average round-trip price of C$ 552.

What’s the fastest layover option from Toronto to St. Louis?

Flights via Detroit (DTW) have the shortest average one-way travel time for 1-stop routes: 4h 19m.

Which airport typically offers the quickest layover for flights from Toronto to St. Louis?

Flights via Detroit (DTW) offer the fastest connection on this route, with an average layover time of 1h 26m.

How far ahead should I book a flight from Toronto to St. Louis?

Booking 46 days in advance of your planned departure date is, on average, the best time to get cheap flights from Toronto to St. Louis. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

Reviews of airlines servicing St. Louis

Check out reviews from past customers who have flown with Air Canada from Toronto 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.
Air Canada
7.1
Good
11,593 reviews
Check prices

Entertainment

6.8

Overall

7.1

Comfort

7.1

Food

6.3

Crew

7.8

Boarding

7.3

Reviews

1 / 20
2.0
Mediocre

Sylvia,Aug 2026

YYZ - PHL

Our flight from Kelowna was 5 hours delayed. We missed our connection. We were able to get to a hotel by 3:00 a.m. but the breakfast cost us $40. The hotel was good. We were rescheduled for the flight the next night when it was canceled. There were no hotel vouchers available which didn't matter because there were no hotel rooms available. We decided to just drive which was not easy doing a one-way rental to the United States. Worst possible trip I've ever had
Air Canada
7.1
Good
11,593 reviews
Air Canada
7.1
Good
11,593 reviews
Check prices

Entertainment

6.8

Overall

7.1

Comfort

7.1

Food

6.3

Crew

7.8

Boarding

7.3

Reviews

1 / 20
2.0
Mediocre

Sylvia,Aug 2026

YYZ - PHL

Our flight from Kelowna was 5 hours delayed. We missed our connection. We were able to get to a hotel by 3:00 a.m. but the breakfast cost us $40. The hotel was good. We were rescheduled for the flight the next night when it was canceled. There were no hotel vouchers available which didn't matter because there were no hotel rooms available. We decided to just drive which was not easy doing a one-way rental to the United States. Worst possible trip I've ever had

Related info for your journey

  • What airport do you fly into for flights to St. Louis from Toronto?

    If you book a flight to St. Louis from Toronto, you will be flying to Lambert-St Louis, which is the city’s only airport. Lambert-St Louis (STL) is located 20.4 km from the centre of St. Louis. There are 2 flights from Toronto to Lambert-St Louis per day from 2 different airlines.

  • How long is the flight from Toronto to St. Louis?

    For as low as C$ 599, Delta can have you in St. Louis from Toronto in 9h 18m. The distance from Toronto to St. Louis is about 1051 km. This flight may include one or multiple stops.

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

    Flying on Air Canada is currently your cheapest option to St. Louis, with prices starting at C$ 333. Another option worth looking into is United Airlines, starting at C$ 338 round trip. Air Canada is currently priced 53% below the average price you’ll pay for this route.

  • What are the most reliable airlines from Toronto to St. Louis?

    The top 3 most reliable airlines when flying from Toronto to St. Louis are Air Canada (67%), Jazz (67%) and United Airlines (67%).

  • What are the cheapest flights from Toronto to St. Louis?

    While on average a flight from Toronto to St. Louis is generally C$ 800, our data shows the cheapest flight currently is C$ 637. When looking at the most popular route, (Toronto Pearson Intl - Lambert-St Louis), you can expect to pay C$ 522 for that flight.

  • Can I find deals for flights from Toronto to St. Louis that include hotel bookings?

    Yes. In addition to deals on Toronto to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Toronto to St. Louis?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Toronto to St. Louis.

  • Can I find deals for business class flights from Toronto to St. Louis?

    Yes. Cheapflights offers flight deals from Toronto to St. Louis 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 Toronto to St. Louis?

    Currently, January is the cheapest month in which you can book a flight from Toronto to St. Louis (average of C$ 580). Flying from Toronto to St. Louis in April is currently the most expensive (average of C$ 844). 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

Travelling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Chesterfield

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Top 2 airlines flying from Toronto to St. Louis

AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 333AverageC$ 644FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 338AverageC$ 586FlexibilityNo cancel feeOn-time69%
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