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Cheap flights from Missouri to Ontario from C$ 154

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/12. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YYZ
29 Nov — 6 Dec1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Missouri to Ontario

Keep the following information in mind while searching for Missouri to Ontario flight deals. Data was last updated 30 October 2025.

Round-trip from

C$ 377

One-way from

C$ 154

Popular in

October

Cheapest in

February

Average price

C$ 1,166

Good round-trip deal

C$ 345 or less
8/1-14/1
  • 8/1-14/1
  • 2 total stops
  • 36h 31m total
  • Missouri to Ontario
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American Airlines
  • American Airlines
  • 4/12
  • 1 total stop
  • 9h 48m total
  • Missouri to Ontario
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Highest demand for flights based on searches. 5% potential increase in price (C$ 76 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease (C$ 20 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Price to beat on a round-trip flight from Missouri to Ontario.
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Find flight deals from Missouri to Ontario

Enter your travel dates to find the best prices.

Cheapest flights from Missouri to Ontario
Explore the most affordable flight options available from Missouri to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 30 October 2025.

Thu 4/123:30 p.m.STL - YYZ
1 stop7h 41mMultiple Airlines
Mon 8/1212:50 p.m.YYZ - STL
1 stop10h 43mMultiple Airlines
Deal found 28/10C$ 420
Fri 12/127:01 p.m.MCI - YYZ
2 stops18h 19mMultiple Airlines
Mon 15/127:10 a.m.YYZ - MCI
1 stop17h 05mMultiple Airlines
Deal found 29/10C$ 433
Mon 17/119:50 a.m.STL - YYZ
2 stops10h 17mMultiple Airlines
Fri 21/117:00 a.m.YYZ - STL
1 stop26h 57mMultiple Airlines
Deal found 28/10C$ 441
Mon 8/1210:47 a.m.STL - YYZ
2 stops12h 38mMultiple Airlines
Mon 15/127:15 a.m.YYZ - STL
1 stop16h 18mMultiple Airlines
Deal found 30/10C$ 448
Thu 11/123:47 p.m.MCI - YYZ
1 stop7h 24mMultiple Airlines
Sun 14/128:00 p.m.YYZ - MCI
1 stop28h 15mMultiple Airlines
Deal found 28/10C$ 454
Tue 16/126:30 a.m.MCI - YYZ
1 stop12h 25mMultiple Airlines
Sun 11/17:10 a.m.YYZ - MCI
1 stop30h 29mMultiple Airlines
Deal found 30/10C$ 478
Fri 28/1112:58 p.m.MCI - YYZ
2 stops23h 42mMultiple Airlines
Mon 1/125:15 p.m.YYZ - MCI
1 stop19h 48mMultiple Airlines
Deal found 30/10C$ 499
Mon 17/119:50 a.m.STL - YYZ
2 stops10h 17mMultiple Airlines
Thu 20/115:15 p.m.YYZ - STL
1 stop7h 42mMultiple Airlines
Deal found 28/10C$ 500
Sun 16/116:21 p.m.STL - YYZ
2 stops25h 46mMultiple Airlines
Thu 20/115:15 p.m.YYZ - STL
1 stop7h 42mMultiple Airlines
Deal found 28/10C$ 505
Wed 19/116:06 a.m.MCI - YOW
1 stop6h 26mUnited Airlines
Wed 3/126:20 a.m.YOW - MCI
1 stop9h 01mUnited Airlines
Deal found 29/10C$ 507
Sun 7/123:30 p.m.STL - YYZ
1 stop19h 13mMultiple Airlines
Thu 11/127:55 p.m.YYZ - STL
1 stop17h 17mMultiple Airlines
Deal found 29/10C$ 512
Fri 12/123:47 p.m.MCI - YYZ
1 stop18h 56mMultiple Airlines
Fri 19/129:35 a.m.YYZ - MCI
2 stops35h 16mMultiple Airlines
Deal found 28/10C$ 512

Cheapflights Fare Finder

 
Customize your flight search to find flights from Missouri to Ontario 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 629,999 searches. Data last updated 30 October 2025.
Use the filters below to find and compare flights from Missouri to Ontario that are best for you.

Fly from

Missouri

Fly to

Ontario

Route

Depart

Return

Price

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Thu 8/1

5:11 p.m.-2:20 p.m.

1 stop20h 09m

Toronto Pearson Intl

Wed 14/1

7:15 a.m.-10:37 p.m.

1 stop16h 22m

C$ 377

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 14/2

6:33 p.m.-3:05 p.m.

1 stop19h 32m

Montreal Pierre Elliott Trudeau Intl

Wed 18/2

3:55 p.m.-9:33 a.m.

1 stop18h 38m

C$ 406

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Sat 14/2

10:03 a.m.-9:29 p.m.

1 stop10h 26m

Toronto Pearson Intl

Sat 21/2

6:00 a.m.-1:49 p.m.

1 stop8h 49m

C$ 419

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Thu 4/12

3:30 p.m.-12:11 a.m.

1 stop7h 41m

Toronto Pearson Intl

Mon 8/12

12:50 p.m.-10:33 p.m.

1 stop10h 43m

C$ 420

Kansas CityToronto

MCI - YYZ

MCIYYZ

Kansas City

Fri 12/12

7:01 p.m.-2:20 p.m.

2 stops18h 19m

Toronto Pearson Intl

Mon 15/12

7:10 a.m.-11:15 p.m.

1 stop17h 05m

C$ 433

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Mon 17/11

9:50 a.m.-9:07 p.m.

2 stops10h 17m

Toronto Pearson Intl

Fri 21/11

7:00 a.m.-8:57 a.m.

1 stop26h 57m

C$ 441

Kansas CityToronto

MCI - YYZ

MCIYYZ

Kansas City

Thu 11/12

3:47 p.m.-12:11 a.m.

1 stop7h 24m

Toronto Pearson Intl

Sun 14/12

8:00 p.m.-11:15 p.m.

1 stop28h 15m

C$ 454

Kansas CityToronto

MCI - YYZ

MCIYYZ

Kansas City

Tue 16/12

6:30 a.m.-7:55 p.m.

1 stop12h 25m

Toronto Pearson Intl

Sun 11/1

7:10 a.m.-12:39 p.m.

1 stop30h 29m

C$ 478

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Sat 28/2

5:11 p.m.-2:20 p.m.

1 stop20h 09m

Toronto Pearson Intl

Wed 4/3

6:30 p.m.-9:47 a.m.

2 stops16h 17m

C$ 494

Kansas CityOttawa

MCI - YOW

MCIYOW

Kansas City

Sun 23/11

6:43 p.m.-10:26 a.m.

1 stop14h 43m

Ottawa

Sat 29/11

9:45 a.m.-2:59 p.m.

1 stop6h 14m

C$ 507

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/10

Showing 1-10 of 60 results
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Best time to book a flight from Missouri to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Missouri with our price prediction graph.
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 Missouri to Ontario

What is the cheapest month to book a flight from Missouri to Region of Ontario?

Currently, June is the cheapest month in which you can book a flight from Missouri to Region of Ontario (average of C$ 250). Flying from Missouri to Region of Ontario in February is currently the most expensive (average of C$ 504). 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 MO to ON?

Find hourly flight availability from Missouri to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 30 October 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Missouri to Region of Ontario as you normally would.

How much does it cost to fly round-trip from Missouri to Region of Ontario?

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated 30 October 2025.
Read reviews from past customers who have flown Air Canada from Missouri to Ontario. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Air Canada
7.1
Good
10,381 reviews
Check prices

Overall

7.1

Boarding

7.3

Entertainment

6.8

Crew

7.8

Comfort

7.1

Food

6.3

Reviews

1 / 20
2.0
Mediocre

Shawna,Sep 2025

DCA - YYZ

Business class cabin was *freezing*. Landing was so hard it injured my back - no apology or explanation given
Air Canada
7.1
Good
10,381 reviews
Air Canada
7.1
Good
10,381 reviews
Check prices

Overall

7.1

Boarding

7.3

Entertainment

6.8

Crew

7.8

Comfort

7.1

Food

6.3

Reviews

1 / 20
2.0
Mediocre

Shawna,Sep 2025

DCA - YYZ

Business class cabin was *freezing*. Landing was so hard it injured my back - no apology or explanation given

Related info for your journey

Find useful and relevant information for your journey from Missouri to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Missouri to Region of Ontario?

    American Airlines and United Airlines can get you from Missouri to Region of Ontario in just under 14h 43m. Your travel time can differ by up to 4h 49m. The distance from Missouri to Region of Ontario is about 1698 km. This flight may include one or multiple stops.

  • Can I find deals for flights from Missouri to Ontario that include hotel bookings?

    Yes. In addition to deals on Missouri to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Missouri to Ontario?

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

  • Can I find deals for business class flights from Missouri to Ontario?

    Yes. Cheapflights offers flight deals from Missouri to Ontario 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 Missouri to Region of Ontario?

    Currently, June is the cheapest month in which you can book a flight from Missouri to Region of Ontario (average of C$ 250). Flying from Missouri to Region of Ontario in February is currently the most expensive (average of C$ 504). 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

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Alternative routes for Missouri to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top airline flying from Missouri to Ontario

Discover the top airline that operate flights from Missouri to Ontario. 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 629,999 searches. Data last updated 30 October 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 304AverageC$ 651FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Missouri to Ontario?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Missouri to Ontario. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Missouri to Ontario?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Ontario from Missouri.

Can Cheapflights find flights from Missouri to Ontario with no change fees?

Certainly. Search results for flights to Ontario from Missouri shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Missouri to Ontario become cheaper?

Yes! Start tracking prices for Missouri to Ontario flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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