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Cheap flights from Ontario to Missouri from C$ 171

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 4/3. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — STL
27 Feb — 6 Mar1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Ontario to Missouri

Enter your travel dates to find the best prices.

Cheapest flights from Ontario to Missouri
Explore the most affordable flight options available from Ontario to Missouri. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 28 January 2026.

Sat 21/23:40 p.m.
YYZ
-
STL
2 stops40h 11m
Multiple Airlines
Mon 2/33:49 p.m.
STL
-
YYZ
1 stop7h 40m
Multiple Airlines
Deal found 27/1C$ 375
Tue 3/23:40 p.m.
YYZ
-
STL
2 stops16h 11m
Multiple Airlines
Tue 10/23:49 p.m.
STL
-
YYZ
1 stop7h 25m
Multiple Airlines
Deal found 28/1C$ 388
Wed 25/26:00 a.m.
YYZ
-
STL
1 stop10h 35m
American Airlines
Wed 4/36:00 a.m.
STL
-
YYZ
1 stop10h 36m
American Airlines
Deal found 27/1C$ 400
Thu 5/28:20 p.m.
YYZ
-
STL
1 stop15h 03m
Multiple Airlines
Sun 8/25:42 p.m.
STL
-
YYZ
1 stop19h 38m
Multiple Airlines
Deal found 27/1C$ 411
Wed 11/22:15 p.m.
YOW
-
MCI
1 stop6h 41m
United Airlines
Wed 18/212:37 p.m.
MCI
-
YOW
1 stop5h 18m
United Airlines
Deal found 26/1C$ 418
Tue 17/211:10 a.m.
YOW
-
MCI
1 stop11h 49m
United Airlines
Thu 19/28:00 a.m.
MCI
-
YOW
1 stop12h 18m
United Airlines
Deal found 27/1C$ 432
Tue 24/25:11 p.m.
YOW
-
STL
1 stop4h 54m
United Airlines
Tue 3/36:25 a.m.
STL
-
YOW
1 stop9h 42m
United Airlines
Deal found 26/1C$ 436
Wed 25/27:10 a.m.
YYZ
-
STL
1 stop16h 17m
Multiple Airlines
Wed 4/38:17 p.m.
STL
-
YYZ
2 stops22h 38m
Multiple Airlines
Deal found 27/1C$ 442
Mon 9/35:15 p.m.
YYZ
-
MCI
1 stop23h 14m
Multiple Airlines
Tue 17/37:00 a.m.
MCI
-
YYZ
2 stops15h 11m
Multiple Airlines
Deal found 27/1C$ 448
Sat 16/57:00 a.m.
YOW
-
STL
1 stop6h 06m
Air Canada
Mon 18/57:30 a.m.
STL
-
YOW
1 stop4h 40m
Air Canada
Deal found 26/1C$ 469
Wed 25/35:15 p.m.
YYZ
-
STL
1 stop15h 02m
Multiple Airlines
Tue 31/311:27 a.m.
STL
-
YYZ
2 stops35h 47m
Multiple Airlines
Deal found 26/1C$ 469
Tue 17/24:44 p.m.
YYZ
-
STL
1 stop8h 04m
American Airlines
Sat 28/210:43 a.m.
STL
-
YYZ
1 stop9h 46m
American Airlines
Deal found 27/1C$ 470

Find flight deals from Ontario to Missouri

Keep the following information in mind while searching for Ontario to Missouri flight deals. Data was last updated 28 January 2026.

Round-trip from

C$ 375

One-way from

C$ 171

Popular in

August

Cheapest in

April

Average price

C$ 780

Good round-trip deal

C$ 577 or less
21/2-2/3
  • 21/2-2/3
  • 3 total stops
  • 47h 51m total
  • Ontario to Missouri
Search Deals
4/3
  • 4/3
  • 1 total stop
  • 16h 12m total
  • Ontario to Missouri
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (C$ 80 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 15 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals
Price to beat on a round-trip flight from Ontario to Missouri.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Missouri 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 28 January 2026.
Use the filters below to find and compare flights from Ontario to Missouri that are best for you.

Fly from

Ontario

Fly to

Missouri

Route

Depart

Return

Price

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Wed 25/2

6:00 a.m.-3:35 p.m.

1 stop10h 35m

Lambert-St Louis

Wed 4/3

6:00 a.m.-5:36 p.m.

1 stop10h 36m

C$ 400

OttawaKansas City

YOW - MCI

YOWMCI

Ottawa

Wed 11/2

2:15 p.m.-7:56 p.m.

1 stop6h 41m

Kansas City

Wed 18/2

12:37 p.m.-6:55 p.m.

1 stop5h 18m

C$ 418

OttawaKansas City

YOW - MCI

YOWMCI

Ottawa

Tue 17/2

11:10 a.m.-9:59 p.m.

1 stop11h 49m

Kansas City

Thu 19/2

8:00 a.m.-9:18 p.m.

1 stop12h 18m

C$ 432

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Tue 24/2

5:11 p.m.-9:05 p.m.

1 stop4h 54m

Lambert-St Louis

Tue 3/3

6:25 a.m.-2:27 p.m.

2 stops7h 02m

C$ 436

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Thu 26/2

5:11 p.m.-10:59 p.m.

1 stop6h 48m

Lambert-St Louis

Thu 5/3

7:41 a.m.-5:12 p.m.

1 stop8h 31m

C$ 436

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Wed 25/2

7:10 a.m.-10:27 p.m.

1 stop16h 17m

Lambert-St Louis

Wed 4/3

8:17 p.m.-7:55 p.m.

2 stops22h 38m

C$ 442

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Sat 16/5

7:00 a.m.-12:06 p.m.

1 stop6h 06m

Lambert-St Louis

Mon 18/5

7:30 a.m.-1:10 p.m.

1 stop4h 40m

C$ 469

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Tue 24/2

6:00 a.m.-1:43 p.m.

1 stop8h 43m

Lambert-St Louis

Sat 28/2

8:00 a.m.-9:29 p.m.

1 stop12h 29m

C$ 470

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Wed 25/3

8:20 p.m.-7:17 a.m.

1 stop11h 57m

Lambert-St Louis

Sun 29/3

11:21 a.m.-12:14 a.m.

2 stops35h 53m

C$ 481

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Wed 25/3

6:00 a.m.-1:39 p.m.

1 stop8h 39m

Lambert-St Louis

Tue 31/3

12:05 p.m.-9:29 p.m.

1 stop8h 24m

C$ 493

Flights are sorted by cheapest round-trip flights first.

Deals found on 26/1

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

Have a flexible travel schedule? Discover the best time to fly to Missouri from Ontario 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 Ontario to Missouri

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

Currently, December is the cheapest month in which you can book a flight from Region of Ontario to Missouri (average of C$ 338). Flying from Region of Ontario to Missouri in January is currently the most expensive (average of C$ 491). 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 ON to MO?

Find hourly flight availability from Ontario to Missouri. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 28 January 2026.

When flying from Region of Ontario to Missouri, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from Region of Ontario to Missouri

Explore weekly flight availability from Ontario to Missouri. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 28 January 2026.

The most flights from CAON to USMO are scheduled on a Tuesday (2 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (1 on average).

Reviews of airlines servicing Missouri

Get insights into the airlines that provide service to Missouri. 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 Missouri. Reviews last updated 28 January 2026.
Get a feel of what it's like to fly with Delta,United Airlines, andAmerican Airlines from Ontario to Missouri by reading reviews from past customers. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,121 reviews
Check prices

Boarding

8.1

Food

7.2

Overall

7.9

Comfort

7.9

Crew

8.5

Entertainment

7.8

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,121 reviews
Delta
7.9
Good
8,121 reviews
Check prices

Boarding

8.1

Food

7.2

Overall

7.9

Comfort

7.9

Crew

8.5

Entertainment

7.8

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
United Airlines
7.4
Good
9,205 reviews
Delta
7.9
Good
8,121 reviews
Check prices

Boarding

8.1

Food

7.2

Overall

7.9

Comfort

7.9

Crew

8.5

Entertainment

7.8

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
American Airlines
7.2
Good
11,200 reviews
Delta
7.9
Good
8,121 reviews
Check prices

Boarding

8.1

Food

7.2

Overall

7.9

Comfort

7.9

Crew

8.5

Entertainment

7.8

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
WestJet
7.2
Good
3,250 reviews
Delta
7.9
Good
8,121 reviews
Check prices

Boarding

8.1

Food

7.2

Overall

7.9

Comfort

7.9

Crew

8.5

Entertainment

7.8

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Air Canada
7.1
Good
10,664 reviews
Delta
7.9
Good
8,121 reviews
Check prices

Boarding

8.1

Food

7.2

Overall

7.9

Comfort

7.9

Crew

8.5

Entertainment

7.8

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Missouri. 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 Region of Ontario to Missouri?

    Airlines like American Airlines, United Airlines, and Air Canada fly from Region of Ontario to Missouri in about 6h 06m. The time it takes to get you to your destination can typically vary by up to 4h 29m. The distance between Region of Ontario and Missouri is about 1413 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

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

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

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

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

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

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

    Currently, December is the cheapest month in which you can book a flight from Region of Ontario to Missouri (average of C$ 338). Flying from Region of Ontario to Missouri in January is currently the most expensive (average of C$ 491). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to Missouri

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from Ontario to Missouri

Discover the top 5 airlines that operate flights from Ontario to Missouri. 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 28 January 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapestC$ 329AverageC$ 826FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
American AirlinesCheapestC$ 369AverageC$ 686FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Air CanadaCheapestC$ 423AverageC$ 635FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
DeltaCheapestC$ 470AverageC$ 653FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
WestJetCheapestC$ 552AverageC$ 837FlexibilityNo cancel feeOn-time60%
Search WestJet 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 Ontario to Missouri?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Ontario to Missouri. 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 Ontario to Missouri?

Cheapflights helps you find that perfect flight to Missouri from Ontario by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

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

Cheapflights does show flights with no change fees to all users. To see these options for flights from Ontario to Missouri, users can toggle the no change fees filter when performing a flight search.

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

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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