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Missouri

$125+ Cheap flights from Ontario to Missouri

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 3/4. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — STL
Feb 27 — Mar 61
Fri 2/27
Fri 3/6
1 adult, Economy
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Cheap flight deals from Ontario to Missouri

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 January 28, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/27. 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.
Sat 2/213:40 pm
YYZ
-
STL
2 stops40h 11m
Multiple Airlines
Mon 3/23:49 pm
STL
-
YYZ
1 stop7h 40m
Multiple Airlines
Deal found 1/27$274
This Kiwi.com deal was found by Cheapflights users on 1/28. 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 2/33:40 pm
YYZ
-
STL
2 stops16h 11m
Multiple Airlines
Tue 2/103:49 pm
STL
-
YYZ
1 stop7h 25m
Multiple Airlines
Deal found 1/28$284
This American Airlines deal was found by Cheapflights users on 1/27. 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.
Wed 2/256:00 am
YYZ
-
STL
1 stop10h 35m
American Airlines
Wed 3/46:00 am
STL
-
YYZ
1 stop10h 36m
American Airlines
Deal found 1/27$293
This Kiwi.com deal was found by Cheapflights users on 1/27. 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.
Thu 2/58:20 pm
YYZ
-
STL
1 stop15h 03m
Multiple Airlines
Sun 2/85:42 pm
STL
-
YYZ
1 stop19h 38m
Multiple Airlines
Deal found 1/27$301
This United Airlines deal was found by Cheapflights users on 1/26. 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 2/112:15 pm
YOW
-
MCI
1 stop6h 41m
United Airlines
Wed 2/1812:37 pm
MCI
-
YOW
1 stop5h 18m
United Airlines
Deal found 1/26$306
This United Airlines deal was found by Cheapflights users on 1/27. 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 2/1711:10 am
YOW
-
MCI
1 stop11h 49m
United Airlines
Thu 2/198:00 am
MCI
-
YOW
1 stop12h 18m
United Airlines
Deal found 1/27$316
This United Airlines deal was found by Cheapflights users on 1/26. 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 2/245:11 pm
YOW
-
STL
1 stop4h 54m
United Airlines
Tue 3/36:25 am
STL
-
YOW
2 stops7h 02m
United Airlines
Deal found 1/26$319
This Kiwi.com deal was found by Cheapflights users on 1/27. 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.
Wed 2/257:10 am
YYZ
-
STL
1 stop16h 17m
Multiple Airlines
Wed 3/48:17 pm
STL
-
YYZ
2 stops22h 38m
Multiple Airlines
Deal found 1/27$323
This Kiwi.com deal was found by Cheapflights users on 1/27. 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.
Mon 3/95:15 pm
YYZ
-
MCI
1 stop23h 14m
Multiple Airlines
Tue 3/177:00 am
MCI
-
YYZ
2 stops15h 11m
Multiple Airlines
Deal found 1/27$328
This Air Canada deal was found by Cheapflights users on 1/26. 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.
Sat 5/167:00 am
YOW
-
STL
1 stop6h 06m
Air Canada
Mon 5/187:30 am
STL
-
YOW
1 stop4h 40m
Air Canada
Deal found 1/26$343
This Kiwi.com deal was found by Cheapflights users on 1/26. 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.
Wed 3/255:15 pm
YYZ
-
STL
1 stop15h 02m
Multiple Airlines
Tue 3/3111:27 am
STL
-
YYZ
2 stops35h 47m
Multiple Airlines
Deal found 1/26$343
This American Airlines deal was found by Cheapflights users on 1/27. 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.
Tue 2/174:44 pm
YYZ
-
STL
1 stop8h 04m
American Airlines
Sat 2/2810:43 am
STL
-
YYZ
1 stop9h 46m
American Airlines
Deal found 1/27$344

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 January 28, 2026.

Round-trip from

$274
(Kiwi.com)

One-way from

$125
(Trip.com)

Popular in

September

Cheapest in

June

Average price

$395

Good round-trip deal

$394 or less
From Ontario to Missouri
Search Deals
One-way flight from Ontario to Missouri
Search Deals
Highest demand for flights based on searches. 1% potential increase in price ($8 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($9 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 2,558,603 searches. Data last updated January 28, 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 2/25

6:00 am-3:35 pm

1 stop10h 35m

Lambert-St Louis

Wed 3/4

6:00 am-5:36 pm

1 stop10h 36m

$293

OttawaKansas City

YOW - MCI

YOWMCI

Ottawa

Wed 2/11

2:15 pm-7:56 pm

1 stop6h 41m

Kansas City

Wed 2/18

12:37 pm-6:55 pm

1 stop5h 18m

$306

OttawaKansas City

YOW - MCI

YOWMCI

Ottawa

Tue 2/17

11:10 am-9:59 pm

1 stop11h 49m

Kansas City

Thu 2/19

8:00 am-9:18 pm

1 stop12h 18m

$316

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Tue 2/24

5:11 pm-9:05 pm

1 stop4h 54m

Lambert-St Louis

Tue 3/3

6:25 am-2:27 pm

2 stops7h 02m

$319

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Thu 2/26

5:11 pm-10:59 pm

1 stop6h 48m

Lambert-St Louis

Thu 3/5

7:41 am-5:12 pm

1 stop8h 31m

$319

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Wed 2/25

7:10 am-10:27 pm

1 stop16h 17m

Lambert-St Louis

Wed 3/4

8:17 pm-7:55 pm

2 stops22h 38m

$323

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Sat 5/16

7:00 am-12:06 pm

1 stop6h 06m

Lambert-St Louis

Mon 5/18

7:30 am-1:10 pm

1 stop4h 40m

$343

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Tue 2/24

6:00 am-1:43 pm

1 stop8h 43m

Lambert-St Louis

Sat 2/28

8:00 am-9:29 pm

1 stop12h 29m

$344

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Wed 3/25

8:20 pm-7:17 am

1 stop11h 57m

Lambert-St Louis

Sun 3/29

11:21 am-12:14 am

2 stops35h 53m

$352

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Wed 3/25

6:00 am-1:39 pm

1 stop8h 39m

Lambert-St Louis

Tue 3/31

12:05 pm-9:29 pm

1 stop8h 24m

$361

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/26

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 $247). Flying from Region of Ontario to Missouri in January is currently the most expensive (average of $359). 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 January 28, 2026.

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

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 January 28, 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 January 28, 2026.
Peruse reviews from past customers who have flown with Delta, United Airlines, and American Airlines from Ontario to Missouri to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,121 reviews

Boarding

8.1

Comfort

7.9

Entertainment

7.8

Crew

8.5

Overall

7.9

Food

7.2

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

Boarding

8.1

Comfort

7.9

Entertainment

7.8

Crew

8.5

Overall

7.9

Food

7.2

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

Boarding

8.1

Comfort

7.9

Entertainment

7.8

Crew

8.5

Overall

7.9

Food

7.2

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

Boarding

8.1

Comfort

7.9

Entertainment

7.8

Crew

8.5

Overall

7.9

Food

7.2

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

Boarding

8.1

Comfort

7.9

Entertainment

7.8

Crew

8.5

Overall

7.9

Food

7.2

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

Boarding

8.1

Comfort

7.9

Entertainment

7.8

Crew

8.5

Overall

7.9

Food

7.2

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?

    American Airlines, United Airlines, and Air Canada can get you from Region of Ontario to Missouri in just under 6h 06m. Your travel time can differ by up to 4h 29m. The distance from Region of Ontario to Missouri is about 878 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines to fly from Region of Ontario to Missouri one-way?

    To fly one-way, consider booking your trip with Air Canada, which is currently one of the cheapest options available, starting at $187. United Airlines flights start at $188 while deals on American Airlines start at $194 one-way.

  • 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 $247). Flying from Region of Ontario to Missouri in January is currently the most expensive (average of $359). 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 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 2,558,603 searches. Data last updated January 28, 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$323Average$563FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$421Average$471FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$428Average$668FlexibilityNo cancel feeOn-time69%
DeltaCheapest$443Average$581FlexibilityNo cancel feeOn-timeN/A
WestJetCheapest$606Average$755FlexibilityNo cancel feeOn-time60%

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