Missouri

$191+ 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 7/8. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — MCI
Jul 16 — Jul 231
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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 June 16, 2026.

This American Airlines deal was found by Cheapflights users on 6/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/91:15 pm
YYZ
-
STL
1 stop12h 12m
American Airlines
Tue 9/225:00 am
STL
-
YYZ
1 stop8h 32m
American Airlines
Deal found 6/15$312
This American Airlines deal was found by Cheapflights users on 6/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/157:17 am
YYZ
-
STL
1 stop7h 36m
American Airlines
Wed 7/226:55 am
STL
-
YYZ
1 stop9h 39m
American Airlines
Deal found 6/14$324
This American Airlines deal was found by Cheapflights users on 6/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/87:17 am
YYZ
-
STL
1 stop7h 36m
American Airlines
Wed 7/156:55 am
STL
-
YYZ
1 stop9h 39m
American Airlines
Deal found 6/13$335
This American Airlines deal was found by Cheapflights users on 6/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/297:17 am
YYZ
-
STL
1 stop10h 23m
American Airlines
Wed 8/56:00 am
STL
-
YYZ
1 stop7h 33m
American Airlines
Deal found 6/14$338
This United Airlines deal was found by Cheapflights users on 6/11. 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.
Mon 12/146:00 pm
YOW
-
STL
1 stop6h 25m
United Airlines
Tue 12/1510:23 am
STL
-
YOW
1 stop5h 51m
United Airlines
Deal found 6/11$375
This Air Canada deal was found by Cheapflights users on 6/11. 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.
Tue 8/182:35 pm
YOW
-
STL
1 stop5h 07m
Air Canada
Sat 11/74:15 pm
STL
-
YOW
1 stop6h 33m
Air Canada
Deal found 6/11$382
This United Airlines deal was found by Cheapflights users on 6/11. 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 8/186:05 am
YOW
-
STL
2 stops10h 33m
United Airlines
Sat 11/79:23 am
STL
-
YOW
1 stop11h 11m
United Airlines
Deal found 6/11$383
This Air Canada deal was found by Cheapflights users on 6/13. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/289:00 am
YOW
-
STL
1 stop6h 02m
Air Canada
Tue 8/412:10 pm
STL
-
YOW
1 stop6h 35m
Air Canada
Deal found 6/13$389
This United Airlines deal was found by Cheapflights users on 6/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/205:50 pm
YOW
-
STL
1 stop6h 54m
United Airlines
Fri 7/241:13 pm
STL
-
YOW
1 stop7h 22m
United Airlines
Deal found 6/14$390
This United Airlines deal was found by Cheapflights users on 6/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/33:10 pm
YOW
-
STL
1 stop9h 34m
United Airlines
Tue 7/711:25 am
STL
-
YOW
1 stop4h 42m
United Airlines
Deal found 6/15$393
This American Airlines deal was found by Cheapflights users on 6/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/167:27 am
YYZ
-
STL
1 stop8h 23m
American Airlines
Tue 7/219:08 am
STL
-
YYZ
1 stop7h 26m
American Airlines
Deal found 6/15$408
This American Airlines deal was found by Cheapflights users on 6/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/1212:30 pm
YUL
-
STL
1 stop12h 44m
American Airlines
Tue 8/186:00 am
STL
-
YUL
1 stop9h 53m
American Airlines
Deal found 6/15$414

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 June 16, 2026.

Round-trip from

$312
(American Airlines)

One-way from

$191
(American Airlines)

Popular in

March

Cheapest in

January

Average price

$454

Good round-trip deal

$451 or less

Good one-way deal

$252 or less
From Ontario to Missouri
One-way flight from Ontario to Missouri
Highest demand for flights based on searches. 20% potential increase in price ($128 potential increase over avg. RT price).
Cheapest flight prices on average. 7% potential price decrease ($38 potential savings vs. average RT price).
Average for round-trip flights in June 2026
Price to beat on a round-trip flight from Ontario to Missouri.
Price to beat on a one-way flight from Ontario to Missouri.

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 June 16, 2026.
Use the filters below to find and compare flights from Ontario to Missouri that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Tue 10/27

11:00 am-3:38 pm

1 stop5h 38m

Lambert-St Louis

Wed 10/28

9:23 am-5:14 pm

1 stop6h 51m

$375

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Tue 8/18

2:35 pm-6:42 pm

1 stop5h 07m

Lambert-St Louis

Sat 11/7

4:15 pm-11:48 pm

1 stop6h 33m

$382

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Tue 8/18

6:05 am-3:38 pm

2 stops10h 33m

Lambert-St Louis

Sat 11/7

9:23 am-9:34 pm

1 stop11h 11m

$383

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Mon 7/20

5:50 pm-11:44 pm

1 stop6h 54m

Lambert-St Louis

Fri 7/24

1:13 pm-9:35 pm

1 stop7h 22m

$390

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Tue 7/28

6:25 am-3:46 pm

1 stop10h 21m

Lambert-St Louis

Tue 8/4

1:13 pm-11:54 pm

2 stops9h 41m

$390

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Mon 7/27

5:50 pm-11:44 pm

1 stop6h 54m

Lambert-St Louis

Mon 8/3

4:53 pm-9:11 am

1 stop15h 18m

$390

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 7/3

5:50 pm-11:44 pm

1 stop6h 54m

Lambert-St Louis

Tue 7/7

9:20 am-5:07 pm

1 stop6h 47m

$393

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Tue 10/27

9:55 am-3:38 pm

2 stops6h 43m

Lambert-St Louis

Wed 10/28

8:00 am-9:34 pm

1 stop12h 34m

$435

MontrealKansas City

YUL - MCI

YULMCI

Montreal Pierre Elliott Trudeau Intl

Sat 7/4

12:47 pm-8:51 pm

1 stop9h 04m

Kansas City

Sat 7/11

1:17 pm-11:52 pm

1 stop9h 35m

$453

MontrealKansas City

YUL - MCI

YULMCI

Montreal Pierre Elliott Trudeau Intl

Sat 7/11

2:20 pm-8:42 am

2 stops19h 22m

Kansas City

Sat 7/18

6:41 pm-10:40 am

1 stop14h 59m

$454

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/12

Showing 1-10 of 60 resultsSorted by cheapest first
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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 $168). Flying from Region of Ontario to Missouri in April 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 June 16, 2026.

Unlike in the evening, when flights are generally more expensive, you can save up to 35% on flights from Region of Ontario to Missouri by exploring options for tickets in the morning.

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

How far ahead should I book a flight from Region of Ontario to Missouri?

To ensure you get the cheapest price possible for a flight from Region of Ontario to Missouri, you should look to book at least 70 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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 June 16, 2026.
Peruse reviews from past customers who have flown with Delta,United Airlines, andWestJet 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.

Overall

7.9

Food

7.2

Boarding

8.1

Crew

8.5

Entertainment

7.8

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Rakshith,May 2026

TPE - SEA

I got middle seat, but it was cheap $340 for Taipei to PDX ,

Overall

7.9

Food

7.2

Boarding

8.1

Crew

8.5

Entertainment

7.8

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Rakshith,May 2026

TPE - SEA

I got middle seat, but it was cheap $340 for Taipei to PDX ,

Overall

7.9

Food

7.2

Boarding

8.1

Crew

8.5

Entertainment

7.8

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Rakshith,May 2026

TPE - SEA

I got middle seat, but it was cheap $340 for Taipei to PDX ,

Overall

7.9

Food

7.2

Boarding

8.1

Crew

8.5

Entertainment

7.8

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Rakshith,May 2026

TPE - SEA

I got middle seat, but it was cheap $340 for Taipei to PDX ,

Overall

7.9

Food

7.2

Boarding

8.1

Crew

8.5

Entertainment

7.8

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Rakshith,May 2026

TPE - SEA

I got middle seat, but it was cheap $340 for Taipei to PDX ,

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?

    United Airlines, Air Canada, and Delta can get you from Region of Ontario to Missouri in just under 5h 07m. Your travel time can differ by up to 3h 57m. 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 $222. Delta flights start at $293 while deals on United Airlines start at $311 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 $168). Flying from Region of Ontario to Missouri in April 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.

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 June 16, 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$256Average$432FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$428Average$725FlexibilityNo cancel feeOn-time69%
DeltaCheapest$443Average$587FlexibilityNo cancel feeOn-timeN/A
WestJetCheapest$530Average$758FlexibilityNo cancel feeOn-time60%

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