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Cheap flights from Ontario to Missouri from $137

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Missouri departing on 2/1. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Ontario to Missouri

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
7:15 am - 11:33 pm
YYZ
-
STL
17h 18m1 stop
Multiple Airlines Logo
8:59 am - 2:20 pm
STL
-
YYZ
28h 21m1 stop
$221Multiple Airlines
Tue, Feb 3 - Sun, Feb 8
Multiple Airlines Logo
3:40 pm - 6:51 am
YYZ
-
STL
16h 11m2 stops
Multiple Airlines Logo
8:59 am - 2:20 pm
STL
-
YYZ
28h 21m1 stop
$232Multiple Airlines
Tue, Feb 3 - Sun, Feb 8
United Airlines Logo
9:45 am - 10:58 pm
YOW
-
STL
14h 13m2 stops
United Airlines Logo
3:11 pm - 9:18 pm
STL
-
YOW
5h 07m1 stop
$304United Airlines
Thu, Jan 8 - Mon, Jan 12
United Airlines Logo
5:11 pm - 9:59 pm
YOW
-
MCI
5h 48m1 stop
United Airlines Logo
11:29 am - 9:18 pm
MCI
-
YOW
8h 49m1 stop
$304United Airlines
Sat, Jan 31 - Mon, Feb 2
American Airlines Logo
3:55 pm - 9:34 am
YUL
-
STL
18h 39m1 stop
American Airlines Logo
6:00 am - 3:05 pm
STL
-
YUL
8h 05m1 stop
$338American Airlines
Fri, Feb 20 - Mon, Feb 23
Air Canada Logo
7:27 pm - 10:32 am
YOW
-
MCI
16h 05m2 stops
Air Canada Logo
3:24 pm - 11:54 pm
MCI
-
YOW
7h 30m2 stops
$358Air Canada
Sat, Jan 31 - Mon, Feb 2
Air Canada Logo
5:55 pm - 10:32 am
YOW
-
MCI
17h 37m2 stops
Air Canada Logo
11:29 am - 9:56 pm
MCI
-
YOW
9h 27m2 stops
$365Air Canada
Sat, Jan 31 - Mon, Feb 2
American Airlines Logo
1:14 pm - 8:25 pm
YYZ
-
SGF
8h 11m1 stop
American Airlines Logo
7:00 am - 6:20 pm
SGF
-
YYZ
10h 20m1 stop
$407American Airlines
Fri, Jan 16 - Fri, Jan 23
Delta Logo
7:30 pm - 12:36 pm
YUL
-
STL
18h 06m1 stop
Delta Logo
5:56 pm - 11:12 pm
STL
-
YUL
4h 16m1 stop
$496Delta
Fri, Jan 30 - Mon, Feb 2
Delta Logo
7:30 pm - 12:36 pm
YUL
-
STL
18h 06m1 stop
Delta Logo
5:56 pm - 11:12 pm
STL
-
YUL
4h 16m1 stop
$503Delta
Fri, Jan 30 - Mon, Feb 2

United Airlines flights from Region of Ontario to Missouri

Our best United Airlines deals on Region of Ontario to Missouri flight tickets
United Airlines
Jan 31
YOW5:11 pmOttawa
5h 48m
1 stop
MCI9:59 pmKansas City
Feb 2
MCI3:24 pmKansas City
7h 30m
2 stops
YOW11:54 pmOttawa
$304
Find similar
United Airlines
Jan 31
YOW5:11 pmOttawa
5h 48m
1 stop
MCI9:59 pmKansas City
Feb 2
MCI5:45 pmKansas City
5h 09m
1 stop
YOW11:54 pmOttawa
$312
Find similar
United Airlines
Jan 31
YOW6:00 amOttawa
9h 22m
2 stops
MCI2:22 pmKansas City
Feb 2
MCI8:00 amKansas City
12h 56m
2 stops
YOW9:56 pmOttawa
$364
Find similar

WestJet flights from Region of Ontario to Missouri

Our best WestJet deals on Region of Ontario to Missouri flight tickets
WestJet
Jan 14
YUL6:45 amMontreal Pierre Elliott Trudeau Intl
12h 47m
2 stops
MCI6:32 pmKansas City
Jan 21
MCI6:30 amKansas City
23h 35m
2 stops
YUL7:05 amMontreal Pierre Elliott Trudeau Intl
$689
Find similar
WestJet
Dec 25
YYZ6:00 amToronto Pearson Intl
18h 11m
1 stop
MCI11:11 pmKansas City
Jan 2
MCI6:00 amKansas City
16h 38m
2 stops
YYZ11:38 pmToronto Pearson Intl
$781
Find similar
WestJet
Dec 21
YYZ6:05 amToronto Pearson Intl
4h 51m
1 stop
MCI9:56 amKansas City
Dec 27
MCI5:42 pmKansas City
14h 16m
1 stop
YYZ8:58 amToronto Pearson Intl
$796
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Region of 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, momondo users made 832,500 searches. Data last updated December 18, 2025.
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

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Tue 2/3

7:15 am-11:33 pm

1 stop17h 18m

Lambert-St Louis

Sun 2/8

8:59 am-2:20 pm

1 stop28h 21m

$221

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Tue 2/3

3:40 pm-6:51 am

2 stops16h 11m

Lambert-St Louis

Sun 2/8

8:59 am-2:20 pm

1 stop28h 21m

$232

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Thu 1/8

9:45 am-10:58 pm

2 stops14h 13m

Lambert-St Louis

Mon 1/12

3:11 pm-9:18 pm

1 stop5h 07m

$304

OttawaKansas City

YOW - MCI

YOWMCI

Ottawa

Sat 1/31

5:11 pm-9:59 pm

1 stop5h 48m

Kansas City

Mon 2/2

11:29 am-9:18 pm

1 stop8h 49m

$304

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 2/20

3:55 pm-9:34 am

1 stop18h 39m

Lambert-St Louis

Mon 2/23

6:00 am-3:05 pm

1 stop8h 05m

$338

OttawaKansas City

YOW - MCI

YOWMCI

Ottawa

Sat 1/31

7:27 pm-10:32 am

2 stops16h 05m

Kansas City

Mon 2/2

3:24 pm-11:54 pm

2 stops7h 30m

$358

OttawaKansas City

YOW - MCI

YOWMCI

Ottawa

Sat 1/31

5:55 pm-10:32 am

2 stops17h 37m

Kansas City

Mon 2/2

11:29 am-9:56 pm

2 stops9h 27m

$365

TorontoSpringfield

YYZ - SGF

YYZSGF

Toronto Pearson Intl

Fri 1/16

1:14 pm-8:25 pm

1 stop8h 11m

Springfield-Branson

Fri 1/23

7:00 am-6:20 pm

1 stop10h 20m

$407

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 1/30

7:30 pm-12:36 pm

1 stop18h 06m

Lambert-St Louis

Mon 2/2

5:56 pm-11:12 pm

1 stop4h 16m

$496

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 1/30

7:30 pm-12:36 pm

1 stop18h 06m

Lambert-St Louis

Mon 2/2

5:56 pm-11:12 pm

1 stop4h 16m

$503

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Missouri from

How to get the cheapest flight ticket from Region of Ontario to Missouri

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Missouri?

In general, June is the cheapest month to fly from Region of Ontario to Missouri. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $372. If you aren’t able to travel to Missouri during the month of June, then flying in August is also cheap. Prices for this month can be found on momondo for an average of $397.

What is the cheapest day to depart on your flight to Missouri?

The cheapest day to depart from Region of Ontario to Missouri is on a Saturday when prices can be found for as low as $405. Flights from Region of Ontario to Missouri on a Sunday will generally be more expensive and average around $542. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Missouri?

According to our data, the cheapest time of day to fly to Missouri is in the morning. momondo users have found flights departing from Region of Ontario to Missouri in the morning for as low as $326. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to Missouri are more costly at noon, with an average ticket price of $492. Departure times at noon fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest Ontario to Missouri flight route?

Fly from Toronto Pearson Intl to Lambert-St Louis for the best Ontario - Missouri flight prices

How far in advance should I book a flight to Missouri?

You are more likely to see cheaper flights to Missouri from Region of Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Missouri for around $472 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Missouri from Region of Ontario for as low as $360 on momondo.

What cabin class options are available on Ontario to Missouri flights?

There are 3 cabin classes available to choose from on Ontario to Missouri flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Region of Ontario to Missouri flights?

You could potentially save up to 41% on your flight if you consider stops on a Region of Ontario to Missouri flight.

Cheap Region of Ontario to Missouri flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Region of Ontario to Missouri

Best Price Found

$542

Fastest flight time

2h 14m

Direct flights

Every day

Airports in Missouri

55 airports
The best flight deal from Region of Ontario to Missouri found on momondo in the last 72 hours is $542
The fastest flight from Region of Ontario to Missouri takes 2h 14m
Direct flights go from Region of Ontario to Missouri every day.
There are 55 airports in Missouri. From Region of Ontario there are direct flights to Lambert-St Louis (STL).
Search flight deals

  • When did momondo last update prices for flights from Ontario to Missouri?

    Prices for flights from Ontario to Missouri were last updated today.

  • How many operators does momondo search for flights from Ontario to Missouri?

  • How old do you have to be to fly from Ontario to Missouri?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario to Missouri.

  • What documentation or ID do you need to fly to Missouri?

    The required travel and health documents for your Missouri trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Missouri. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from Region of Ontario to Missouri?

Best airlines flying from Region of Ontario to Missouri

Compare and see reviews for airlines that fly from Region of Ontario to Missouri with momondo
Airline
Rating
Free Cancellation
Price
Air CanadaPriceFrom $324Free CancellationRating
7.1
10,534 reviews
Search Air Canada flights
American AirlinesPriceFrom $421Free CancellationRating
7.2
11,055 reviews
Search American Airlines flights
DeltaPriceFrom $472Free CancellationRating
7.9
8,008 reviews
Search Delta flights
United AirlinesPriceFrom $473Free CancellationRating
7.4
9,093 reviews
Search United Airlines flights
WestJetPriceFrom $606Free CancellationRating
7.2
3,204 reviews
Search WestJet flights

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Missouri?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Ontario to Missouri. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Ontario to Missouri with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Missouri from Ontario with this policy.

How can momondo help me find flights from Ontario to Missouri?

momondo helps you find the best flight between Ontario and Missouri by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Ontario to Missouri right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Missouri, momondo offers a useful price alert feature which will track prices for flights to Missouri from Ontario and alert you when they change.

An easier way to manage your Missouri trip

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