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$121+ Cheap flights from Missouri to Ontario

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 10/5. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YYZ
aug. 18 — aug. 251
man. 8/18
man. 8/25
1 adult, Economy
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Cheap flight deals from Missouri to Ontario

Keep the following information in mind while searching for Missouri to Ontario flight deals. Data was last updated august 13, 2025.

Round-trip from

$302
(Kiwi.com)

One-way from

$121
(Kiwi.com)

Popular in

January

Cheapest in

February

Average price

$721

Good round-trip deal

$673 or less

Good one-way deal

$280 or less
From Missouri to Ontario
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One-way flight from Missouri to Ontario
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High demand for flights, 1% potential price rise
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Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Price to beat on a round-trip flight from Missouri to Ontario.
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Price to beat on a one-way flight from Missouri to Ontario.
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Find flight deals from Missouri to Ontario

Cheapest flights from Missouri to Ontario
Explore the most affordable flight options available from Missouri to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on august 13, 2025.

This Kiwi.com deal was found by Cheapflights users on 8/12. 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.
man. 9/2211:13 amMCI - YYZ
1 stop25h 52mMultiple Airlines
tir. 9/307:45 pmYYZ - MCI
1 stop20h 25mMultiple Airlines
Deal found 8/12$302
This Kiwi.com deal was found by Cheapflights users on 8/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
fre. 9/265:15 amMCI - YYZ
1 stop7h 37mMultiple Airlines
fre. 10/34:00 pmYYZ - MCI
1 stop8h 07mMultiple Airlines
Deal found 8/11$322
This Kiwi.com deal was found by Cheapflights users on 8/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
tor. 10/1610:54 amSTL - YYZ
1 stop9h 01mMultiple Airlines
man. 10/201:30 pmYYZ - STL
1 stop21h 29mMultiple Airlines
Deal found 8/11$332
This American Airlines deal was found by Cheapflights users on 8/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
tor. 11/67:58 pmSTL - YUL
1 stop18h 13mAmerican Airlines
søn. 11/93:52 pmYUL - STL
1 stop17h 18mAmerican Airlines
Deal found 8/11$333
This Kiwi.com deal was found by Cheapflights users on 8/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
fre. 10/175:15 amMCI - YYZ
1 stop7h 37mMultiple Airlines
man. 10/277:55 pmYYZ - MCI
1 stop19h 05mMultiple Airlines
Deal found 8/11$342
This American Airlines deal was found by Cheapflights users on 8/12. 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.
man. 10/137:16 amSTL - YYZ
1 stop9h 24mAmerican Airlines
ons. 10/153:10 pmYYZ - STL
1 stop9h 44mAmerican Airlines
Deal found 8/12$345
This American Airlines deal was found by Cheapflights users on 8/12. 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.
tor. 10/167:16 amSTL - YUL
1 stop8h 23mAmerican Airlines
lør. 10/2512:30 pmYUL - STL
1 stop10h 36mAmerican Airlines
Deal found 8/12$348
This Kiwi.com deal was found by Cheapflights users on 8/13. 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.
fre. 10/311:13 amMCI - YYZ
1 stop25h 52mMultiple Airlines
man. 10/67:00 amYYZ - MCI
1 stop11h 30mMultiple Airlines
Deal found 8/13$349
This Kiwi.com deal was found by Cheapflights users on 8/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
man. 9/85:15 amMCI - YYZ
1 stop16h 25mMultiple Airlines
man. 9/154:00 pmYYZ - MCI
1 stop8h 07mMultiple Airlines
Deal found 8/11$350
This American Airlines deal was found by Cheapflights users on 8/12. 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.
lør. 11/86:00 amSTL - YYZ
1 stop9h 04mAmerican Airlines
søn. 11/91:14 pmYYZ - STL
1 stop11h 42mAmerican Airlines
Deal found 8/12$360
This Kiwi.com deal was found by Cheapflights users on 8/12. 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.
tor. 9/2510:35 amSTL - YYZ
1 stop9h 20mMultiple Airlines
søn. 9/288:00 pmYYZ - STL
1 stop18h 02mMultiple Airlines
Deal found 8/12$364
This Kiwi.com deal was found by Cheapflights users on 8/13. 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.
søn. 10/125:15 amMCI - YYZ
1 stop17h 26mMultiple Airlines
ons. 10/159:50 amYYZ - MCI
1 stop15h 00mMultiple Airlines
Deal found 8/13$364

Cheapflights Fare Finder

 
Customize your flight search to find flights from Missouri to Ontario 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 august 13, 2025.
Use the filters below to find and compare flights from Missouri to Ontario that are best for you.

Fly from

Missouri

Fly to

Ontario

Route

Depart

Return

Price

Kansas CityToronto

MCI - YYZ

MCIYYZ

Kansas City

man. 9/22

11:13 am-2:05 pm

1 stop25h 52m

Toronto Pearson Intl

tir. 9/30

7:45 pm-3:10 pm

1 stop20h 25m

$302

Kansas CityToronto

MCI - YYZ

MCIYYZ

Kansas City

fre. 9/26

5:15 am-1:52 pm

1 stop7h 37m

Toronto Pearson Intl

fre. 10/3

4:00 pm-11:07 pm

1 stop8h 07m

$322

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

tor. 10/16

10:54 am-8:55 pm

1 stop9h 01m

Toronto Pearson Intl

man. 10/20

1:30 pm-9:59 am

1 stop21h 29m

$332

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

tor. 11/6

7:58 pm-3:11 pm

1 stop18h 13m

Montreal Pierre Elliott Trudeau Intl

søn. 11/9

3:52 pm-8:10 am

1 stop17h 18m

$333

Kansas CityToronto

MCI - YYZ

MCIYYZ

Kansas City

fre. 10/17

5:15 am-1:52 pm

1 stop7h 37m

Toronto Pearson Intl

man. 10/27

7:55 pm-2:00 pm

1 stop19h 05m

$342

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

man. 10/13

7:16 am-5:40 pm

1 stop9h 24m

Toronto Pearson Intl

ons. 10/15

3:10 pm-11:54 pm

1 stop9h 44m

$345

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

tor. 10/16

7:16 am-5:40 pm

1 stop9h 24m

Toronto Pearson Intl

man. 10/20

1:15 pm-8:26 pm

1 stop8h 11m

$345

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

lør. 9/13

5:25 pm-11:46 am

1 stop17h 21m

Montreal Pierre Elliott Trudeau Intl

man. 9/15

5:15 pm-9:26 am

1 stop17h 11m

$348

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

tor. 10/16

7:16 am-4:39 pm

1 stop8h 23m

Montreal Pierre Elliott Trudeau Intl

lør. 10/25

12:30 pm-10:06 pm

1 stop10h 36m

$348

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

lør. 10/18

7:16 am-4:39 pm

1 stop8h 23m

Montreal Pierre Elliott Trudeau Intl

lør. 10/25

12:30 pm-10:06 pm

1 stop10h 36m

$348

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/11

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

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

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

Currently, January is the cheapest month in which you can book a flight from Missouri to Region of Ontario (average of $243). Flying from Missouri to Region of Ontario in August is currently the most expensive (average of $348). 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 MO to ON?

Find hourly flight availability from Missouri to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated august 13, 2025.

When flying from Missouri to Region of Ontario, 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 Missouri to Region of Ontario

Explore weekly flight availability from Missouri to Ontario. 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 august 13, 2025.

The most flights from USMO to CAON 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 Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated august 13, 2025.
See what other customers who have flown with Delta, United Airlines, and American Airlines from Missouri to Ontario have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,979 reviews

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,979 reviews
Delta
8.0
Very good
7,979 reviews

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,920 reviews
Delta
8.0
Very good
7,979 reviews

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,979 reviews

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
WestJet
7.2
Good
3,013 reviews
Delta
8.0
Very good
7,979 reviews

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Air Canada
7.1
Good
9,943 reviews
Delta
8.0
Very good
7,979 reviews

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

Find useful and relevant information for your journey from Missouri to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from Missouri to Region of Ontario (average of $243). Flying from Missouri to Region of Ontario in August is currently the most expensive (average of $348). 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 Missouri to Ontario

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

Discover the top 5 airlines that operate flights from Missouri to Ontario. 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 august 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$214Average$678FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$220Average$627FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$330Average$626FlexibilityNo cancel feeOn-time71%
DeltaCheapest$464Average$721FlexibilityNo cancel feeOn-timeN/A
WestJetCheapest$497Average$727FlexibilityNo cancel feeOn-time60%

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