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Cheap flights from Ontario to Missouri from C$ 267

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 8/7. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — MCI
16 Jul — 23 Jul1
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 16 June 2026.

Wed 9/91:15 p.m.
YYZ
-
STL
1 stop12h 12m
American Airlines
Tue 22/95:00 a.m.
STL
-
YYZ
1 stop8h 32m
American Airlines
Deal found 15/6C$ 436
Wed 15/77:17 a.m.
YYZ
-
STL
1 stop7h 36m
American Airlines
Wed 22/76:55 a.m.
STL
-
YYZ
1 stop9h 39m
American Airlines
Deal found 14/6C$ 453
Wed 8/77:17 a.m.
YYZ
-
STL
1 stop7h 36m
American Airlines
Wed 15/76:55 a.m.
STL
-
YYZ
1 stop9h 39m
American Airlines
Deal found 13/6C$ 468
Wed 29/77:17 a.m.
YYZ
-
STL
1 stop10h 23m
American Airlines
Wed 5/86:00 a.m.
STL
-
YYZ
1 stop7h 33m
American Airlines
Deal found 14/6C$ 472
Mon 14/126:00 p.m.
YOW
-
STL
1 stop6h 25m
United Airlines
Tue 15/1210:23 a.m.
STL
-
YOW
1 stop5h 51m
United Airlines
Deal found 11/6C$ 524
Tue 18/82:35 p.m.
YOW
-
STL
1 stop5h 07m
Air Canada
Sat 7/114:15 p.m.
STL
-
YOW
1 stop6h 33m
Air Canada
Deal found 11/6C$ 534
Tue 18/86:05 a.m.
YOW
-
STL
2 stops10h 33m
United Airlines
Sat 7/119:23 a.m.
STL
-
YOW
1 stop11h 11m
United Airlines
Deal found 11/6C$ 535
Tue 28/79:00 a.m.
YOW
-
STL
1 stop6h 02m
Air Canada
Tue 4/812:10 p.m.
STL
-
YOW
1 stop6h 35m
Air Canada
Deal found 13/6C$ 544
Mon 20/75:50 p.m.
YOW
-
STL
1 stop6h 54m
United Airlines
Fri 24/71:13 p.m.
STL
-
YOW
1 stop7h 22m
United Airlines
Deal found 14/6C$ 545
Fri 3/76:25 a.m.
YOW
-
STL
1 stop10h 21m
United Airlines
Tue 7/76:00 a.m.
STL
-
YOW
1 stop6h 59m
United Airlines
Deal found 11/6C$ 549
Thu 16/77:27 a.m.
YYZ
-
STL
1 stop8h 23m
American Airlines
Tue 21/79:08 a.m.
STL
-
YYZ
1 stop7h 26m
American Airlines
Deal found 15/6C$ 570
Wed 12/812:30 p.m.
YUL
-
STL
1 stop12h 44m
American Airlines
Tue 18/86:00 a.m.
STL
-
YUL
1 stop9h 53m
American Airlines
Deal found 15/6C$ 579

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 16 June 2026.

Round-trip from

C$ 436

One-way from

C$ 267

Popular in

March

Cheapest in

January

Average price

C$ 635

Good round-trip deal

C$ 587 or less

Good one-way deal

C$ 378 or less
American Airlines
  • American Airlines
  • 9/9-22/9
  • 2 total stops
  • 20h 44m total
  • Ontario to Missouri
Search Deals
American Airlines
  • American Airlines
  • 8/7
  • 1 total stop
  • 11h 59m total
  • Ontario to Missouri
Search Deals
Highest demand for flights based on searches. 20% potential increase in price (C$ 249 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease (C$ 75 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2026
Search Deals
Price to beat on a round-trip flight from Ontario to Missouri.
Search Deals
Price to beat on a one-way 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 16 June 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 27/10

11:00 a.m.-3:38 p.m.

1 stop5h 38m

Lambert-St Louis

Wed 28/10

9:23 a.m.-5:14 p.m.

1 stop6h 51m

C$ 524

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Tue 18/8

2:35 p.m.-6:42 p.m.

1 stop5h 07m

Lambert-St Louis

Sat 7/11

4:15 p.m.-11:48 p.m.

1 stop6h 33m

C$ 534

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Tue 18/8

6:05 a.m.-3:38 p.m.

2 stops10h 33m

Lambert-St Louis

Sat 7/11

9:23 a.m.-9:34 p.m.

1 stop11h 11m

C$ 535

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Tue 28/7

6:25 a.m.-3:46 p.m.

1 stop10h 21m

Lambert-St Louis

Tue 4/8

1:13 p.m.-11:54 p.m.

2 stops9h 41m

C$ 545

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Mon 20/7

5:50 p.m.-11:44 p.m.

1 stop6h 54m

Lambert-St Louis

Fri 24/7

1:13 p.m.-9:35 p.m.

1 stop7h 22m

C$ 545

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Mon 27/7

5:50 p.m.-11:44 p.m.

1 stop6h 54m

Lambert-St Louis

Mon 3/8

4:53 p.m.-9:11 a.m.

1 stop15h 18m

C$ 545

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 3/7

3:10 p.m.-11:44 p.m.

1 stop9h 34m

Lambert-St Louis

Tue 7/7

11:25 a.m.-5:07 p.m.

1 stop4h 42m

C$ 549

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Tue 27/10

9:55 a.m.-3:38 p.m.

2 stops6h 43m

Lambert-St Louis

Wed 28/10

8:00 a.m.-9:34 p.m.

1 stop12h 34m

C$ 608

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Mon 13/7

4:45 p.m.-1:21 p.m.

2 stops21h 36m

Lambert-St Louis

Mon 20/7

4:09 p.m.-8:05 p.m.

1 stop26h 56m

C$ 621

MontrealKansas City

YUL - MCI

YULMCI

Montreal Pierre Elliott Trudeau Intl

Tue 28/7

9:45 a.m.-4:00 p.m.

1 stop7h 15m

Kansas City

Tue 4/8

6:00 a.m.-2:40 p.m.

2 stops7h 40m

C$ 633

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/6

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 C$ 235). Flying from Region of Ontario to Missouri in April is currently the most expensive (average of C$ 498). 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 16 June 2026.

A simple way to save on the total cost of your ticket is to fly from Region of Ontario to Missouri at noon. If you’re flexible enough to do this you can expect to save up to 37% on your trip compared to booking a flight in the evening.

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?

Booking 70 days in advance of your planned departure date is, on average, the best time to get cheap flights from Region of Ontario to Missouri. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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 16 June 2026.
Get a feel of what it's like to fly with Delta,United Airlines, andWestJet 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
8,407 reviews
Check prices

Comfort

7.8

Boarding

8.1

Entertainment

7.8

Overall

7.9

Crew

8.5

Food

7.2

Reviews

1 / 20
8.0
Excellent

Rakshith,May 2026

TPE - SEA

I got middle seat, but it was cheap $340 for Taipei to PDX ,
Delta
7.9
Good
8,407 reviews
Delta
7.9
Good
8,407 reviews
Check prices

Comfort

7.8

Boarding

8.1

Entertainment

7.8

Overall

7.9

Crew

8.5

Food

7.2

Reviews

1 / 20
8.0
Excellent

Rakshith,May 2026

TPE - SEA

I got middle seat, but it was cheap $340 for Taipei to PDX ,
United Airlines
7.4
Good
9,842 reviews
Delta
7.9
Good
8,407 reviews
Check prices

Comfort

7.8

Boarding

8.1

Entertainment

7.8

Overall

7.9

Crew

8.5

Food

7.2

Reviews

1 / 20
8.0
Excellent

Rakshith,May 2026

TPE - SEA

I got middle seat, but it was cheap $340 for Taipei to PDX ,
WestJet
7.2
Good
3,367 reviews
Delta
7.9
Good
8,407 reviews
Check prices

Comfort

7.8

Boarding

8.1

Entertainment

7.8

Overall

7.9

Crew

8.5

Food

7.2

Reviews

1 / 20
8.0
Excellent

Rakshith,May 2026

TPE - SEA

I got middle seat, but it was cheap $340 for Taipei to PDX ,
American Airlines
7.1
Good
11,667 reviews
Delta
7.9
Good
8,407 reviews
Check prices

Comfort

7.8

Boarding

8.1

Entertainment

7.8

Overall

7.9

Crew

8.5

Food

7.2

Reviews

1 / 20
8.0
Excellent

Rakshith,May 2026

TPE - SEA

I got middle seat, but it was cheap $340 for Taipei to PDX ,
Air Canada
7.1
Good
11,199 reviews
Delta
7.9
Good
8,407 reviews
Check prices

Comfort

7.8

Boarding

8.1

Entertainment

7.8

Overall

7.9

Crew

8.5

Food

7.2

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?

    Airlines like United Airlines, Air Canada, and Delta fly from Region of Ontario to Missouri in about 5h 07m. The time it takes to get you to your destination can typically vary by up to 4h 39m. 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$ 235). Flying from Region of Ontario to Missouri in April is currently the most expensive (average of C$ 498). 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

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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 629,999 searches. Data last updated 16 June 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapestC$ 342AverageC$ 711FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
American AirlinesCheapestC$ 369AverageC$ 799FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Air CanadaCheapestC$ 411AverageC$ 815FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
WestJetCheapestC$ 628AverageC$ 952FlexibilityNo cancel feeOn-time60%
Search WestJet flights
DeltaCheapestC$ 648AverageC$ 807FlexibilityNo cancel feeOn-timeN/A
Search Delta 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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