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Missouri

$152+ 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 10/29. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — STL
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
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Cheap flight deals from Ontario to Missouri

Keep the following information in mind while searching for Ontario to Missouri flight deals. Data was last updated September 15, 2025.

Round-trip from

$263
(Kiwi.com)

One-way from

$152
(Kiwi.com)

Popular in

December

Cheapest in

November

Average price

$606

Good round-trip deal

$405 or less

Good one-way deal

$283 or less
From Ontario to Missouri
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One-way flight from Ontario to Missouri
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Highest demand for flights based on searches. 5% potential increase in price ($33 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($11 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Ontario to Missouri.
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Price to beat on a one-way flight from Ontario to Missouri.
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Find 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 September 15, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/14. 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 10/309:45 amYYZ - STL
1 stop29h 12mMultiple Airlines
Thu 11/66:22 pmSTL - YYZ
2 stops43h 18mMultiple Airlines
Deal found 9/14$287
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 10/112:00 pmYYZ - MCI
2 stops28h 10mMultiple Airlines
Mon 10/65:11 pmMCI - YYZ
1 stop19h 54mMultiple Airlines
Deal found 9/14$297
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 10/2010:40 amYYZ - STL
2 stops23h 27mMultiple Airlines
Thu 10/2310:57 amSTL - YYZ
1 stop26h 08mMultiple Airlines
Deal found 9/15$297
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 10/156:30 amYYZ - MCI
2 stops29h 12mMultiple Airlines
Wed 10/222:55 pmMCI - YYZ
1 stop28h 03mMultiple Airlines
Deal found 9/15$303
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 10/1310:00 amYYZ - MCI
2 stops29h 00mMultiple Airlines
Mon 10/205:11 pmMCI - YYZ
1 stop19h 54mMultiple Airlines
Deal found 9/15$313
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 10/3010:55 amYYZ - MCI
1 stop12h 04mMultiple Airlines
Thu 11/611:12 amMCI - YYZ
2 stops29h 00mMultiple Airlines
Deal found 9/15$316
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 10/229:45 amYYZ - MCI
2 stops25h 57mMultiple Airlines
Sun 10/265:15 amMCI - YYZ
1 stop7h 50mMultiple Airlines
Deal found 9/15$318
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 11/137:40 amYYZ - MCI
1 stop28h 28mMultiple Airlines
Tue 11/187:00 amMCI - YYZ
1 stop11h 55mMultiple Airlines
Deal found 9/13$324
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 9/294:00 pmYYZ - STL
2 stops27h 36mMultiple Airlines
Thu 10/210:35 amSTL - YYZ
1 stop9h 20mMultiple Airlines
Deal found 9/15$324
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 10/26:30 amYYZ - MCI
1 stop28h 48mMultiple Airlines
Mon 10/65:15 pmMCI - YYZ
2 stops19h 50mMultiple Airlines
Deal found 9/15$325
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 11/57:15 amYYZ - MCI
2 stops26h 49mMultiple Airlines
Mon 11/1012:13 pmMCI - YYZ
1 stop29h 49mMultiple Airlines
Deal found 9/15$330
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 11/137:55 pmYYZ - STL
1 stop19h 02mMultiple Airlines
Sun 11/162:42 pmSTL - YYZ
1 stop14h 38mMultiple Airlines
Deal found 9/13$334

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 September 15, 2025.
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

Thu 10/30

9:45 am-1:57 pm

1 stop29h 12m

Lambert-St Louis

Thu 11/6

6:22 pm-2:40 pm

2 stops43h 18m

$287

TorontoKansas City

YYZ - MCI

YYZMCI

Toronto Pearson Intl

Wed 10/1

12:00 pm-3:10 pm

2 stops28h 10m

Kansas City

Mon 10/6

5:11 pm-2:05 pm

1 stop19h 54m

$297

TorontoKansas City

YYZ - MCI

YYZMCI

Toronto Pearson Intl

Wed 10/22

9:45 am-9:58 am

1 stop25h 13m

Kansas City

Sun 10/26

5:15 am-2:05 pm

1 stop7h 50m

$322

TorontoKansas City

YYZ - MCI

YYZMCI

Toronto Pearson Intl

Fri 10/3

9:50 am-11:07 pm

1 stop14h 17m

Kansas City

Tue 10/7

2:55 pm-7:58 pm

1 stop28h 03m

$336

TorontoKansas City

YYZ - MCI

YYZMCI

Toronto Pearson Intl

Wed 11/12

9:35 am-12:40 am

1 stop16h 05m

Kansas City

Sun 11/16

11:12 am-9:53 pm

2 stops33h 41m

$350

TorontoKansas City

YYZ - MCI

YYZMCI

Toronto Pearson Intl

Thu 11/13

9:45 am-12:40 am

1 stop15h 55m

Kansas City

Sun 11/16

10:09 am-11:46 am

1 stop24h 37m

$354

TorontoKansas City

YYZ - MCI

YYZMCI

Toronto Pearson Intl

Sat 11/8

12:40 pm-12:40 am

1 stop13h 00m

Kansas City

Tue 11/11

10:09 am-12:11 am

1 stop13h 02m

$359

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 11/6

3:52 pm-11:56 pm

1 stop9h 04m

Lambert-St Louis

Sat 11/8

7:58 pm-3:11 pm

1 stop18h 13m

$363

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Thu 11/13

7:55 pm-1:57 pm

1 stop19h 02m

Lambert-St Louis

Sun 11/16

7:45 pm-11:46 am

2 stops15h 01m

$364

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 10/29

7:50 am-6:20 pm

2 stops11h 30m

Lambert-St Louis

Wed 11/5

6:00 am-10:39 pm

2 stops15h 39m

$368

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

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, August is the cheapest month in which you can book a flight from Region of Ontario to Missouri (average of $311). Flying from Region of Ontario to Missouri in March is currently the most expensive (average of $356). 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 September 15, 2025.

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 September 15, 2025.

The most flights from CAON to USMO are scheduled on a Monday (4 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (4 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 September 15, 2025.
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
8.0
Very good
7,954 reviews

Crew

8.5

Entertainment

7.9

Overall

8.0

Boarding

8.2

Comfort

7.9

Food

7.3

Reviews

1 / 20
6.0
Good

Morgan Rae,Aug 2025

BRU - JFK

Typically I choose delta because they do a great job but this time the flight attendant in my zone was very rude and didnt offer the same treatment as she did to others
Delta
8.0
Very good
7,954 reviews
Delta
8.0
Very good
7,954 reviews

Crew

8.5

Entertainment

7.9

Overall

8.0

Boarding

8.2

Comfort

7.9

Food

7.3

Reviews

1 / 20
6.0
Good

Morgan Rae,Aug 2025

BRU - JFK

Typically I choose delta because they do a great job but this time the flight attendant in my zone was very rude and didnt offer the same treatment as she did to others
United Airlines
7.4
Good
8,929 reviews
Delta
8.0
Very good
7,954 reviews

Crew

8.5

Entertainment

7.9

Overall

8.0

Boarding

8.2

Comfort

7.9

Food

7.3

Reviews

1 / 20
6.0
Good

Morgan Rae,Aug 2025

BRU - JFK

Typically I choose delta because they do a great job but this time the flight attendant in my zone was very rude and didnt offer the same treatment as she did to others
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,954 reviews

Crew

8.5

Entertainment

7.9

Overall

8.0

Boarding

8.2

Comfort

7.9

Food

7.3

Reviews

1 / 20
6.0
Good

Morgan Rae,Aug 2025

BRU - JFK

Typically I choose delta because they do a great job but this time the flight attendant in my zone was very rude and didnt offer the same treatment as she did to others
Air Canada
7.1
Good
10,000 reviews
Delta
8.0
Very good
7,954 reviews

Crew

8.5

Entertainment

7.9

Overall

8.0

Boarding

8.2

Comfort

7.9

Food

7.3

Reviews

1 / 20
6.0
Good

Morgan Rae,Aug 2025

BRU - JFK

Typically I choose delta because they do a great job but this time the flight attendant in my zone was very rude and didnt offer the same treatment as she did to others

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 Delta can get you from Region of Ontario to Missouri in just under 9h 04m. Your travel time can differ by up to 16h 45m. The distance from Region of Ontario to Missouri is about 967 mi. When browsing for deals, the options you’ll see will be for both nonstop 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, August is the cheapest month in which you can book a flight from Region of Ontario to Missouri (average of $311). Flying from Region of Ontario to Missouri in March is currently the most expensive (average of $356). 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 4 airlines flying from Ontario to Missouri

Discover the top 4 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 September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$324Average$586FlexibilityNo cancel feeOn-time67%
DeltaCheapest$400Average$600FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$421Average$545FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$449Average$692FlexibilityNo cancel feeOn-time69%

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