How long is the flight from Missouri to Region of Ontario?

The flight from Missouri to Region of Ontario depends on which airports you’re departing from and arriving to, and whether or not you have a layover. If you fly from St. Louis (a popular airport in Missouri) to Toronto Pearson Intl Airport (the most popular airport in Region of Ontario), then the flight time is 1h 54m on average. If you fly from Kansas City (another popular airport in Missouri) to Toronto Pearson Intl Airport, then the average flight time is 4h 15m.

What is the cheapest airline that flies from Missouri to Ontario?

American Airlines, Delta, and United Airlines are the most popular carriers operating from Missouri to Ontario

How many flights depart from Missouri to Region of Ontario on average per day?

As of September 2026, there are 6 flights per day flying from Missouri to Region of Ontario. The most common time of day flights depart is 8:00a.m., with 60% of flights taking off in the afternoon.

How many flights depart from Missouri to Region of Ontario on average per week?

The number of flights available between Missouri and Region of Ontario is 48 per week as of September 2026. The most frequent departure day is Mon, with 15% of weekly flights leaving on this day.

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

Prices for flights from Missouri to Ontario are refreshed on a daily basis.

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

The number of operators available for flights from Missouri to Ontario is 1 as of September 2026.

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

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Missouri to Ontario.

What documentation or ID do you need to fly to Ontario?

The travel and health documents required for your trip to Ontario can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Ontario. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

C$ 169 Cheap Flights from Missouri to Ontario in 2026/27

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Missouri to Ontario

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:05 p.m. - 2:10 p.m.STL Lambert-St Louis-YYZ Toronto Pearson Intl

19h 05m1 stop Orlando

5:15 p.m. - 12:41 a.m.YYZ Toronto Pearson Intl-STL Lambert-St Louis

8h 26m1 stop Orlando

C$ 492Multiple Airlines

Mon, 7 Dec - Fri, 11 Dec

5:00 a.m. - 2:33 p.m.STL Lambert-St Louis-YYZ Toronto Pearson Intl

8h 33m1 stop Chicago O'Hare Intl

11:40 a.m. - 8:57 p.m.YYZ Toronto Pearson Intl-STL Lambert-St Louis

10h 17m1 stop Chicago O'Hare Intl

C$ 493American Airlines

Thu, 8 Oct - Thu, 15 Oct

5:00 a.m. - 2:33 p.m.STL Lambert-St Louis-YYZ Toronto Pearson Intl

8h 33m1 stop Chicago O'Hare Intl

1:15 p.m. - 8:57 p.m.YYZ Toronto Pearson Intl-STL Lambert-St Louis

8h 42m1 stop Chicago O'Hare Intl

C$ 493American Airlines

Sat, 17 Oct - Wed, 28 Oct

5:00 a.m. - 2:32 p.m.STL Lambert-St Louis-YYZ Toronto Pearson Intl

8h 32m1 stop Chicago O'Hare Intl

1:15 p.m. - 12:19 a.m.YYZ Toronto Pearson Intl-STL Lambert-St Louis

12h 04m1 stop Chicago O'Hare Intl

C$ 493American Airlines

Thu, 1 Oct - Tue, 6 Oct

6:44 p.m. - 1:40 p.m.STL Lambert-St Louis-YYZ Toronto Pearson Intl

17h 56m2 stops Atlanta Hartsfield-Jackson Orlando

8:30 p.m. - 12:33 p.m.YYZ Toronto Pearson Intl-STL Lambert-St Louis

17h 03m1 stop Las Vegas Harry Reid Intl

C$ 513Multiple Airlines

Wed, 11 Nov - Sun, 15 Nov

5:00 a.m. - 2:32 p.m.STL Lambert-St Louis-YYZ Toronto Pearson Intl

8h 32m1 stop Chicago O'Hare Intl

11:40 a.m. - 8:57 p.m.YYZ Toronto Pearson Intl-STL Lambert-St Louis

10h 17m1 stop Chicago O'Hare Intl

C$ 531American Airlines

Fri, 2 Oct - Wed, 7 Oct

7:29 a.m. - 5:44 p.m.STL Lambert-St Louis-YYZ Toronto Pearson Intl

9h 15m1 stop Chicago O'Hare Intl

11:36 a.m. - 7:22 p.m.YYZ Toronto Pearson Intl-STL Lambert-St Louis

8h 46m1 stop Chicago O'Hare Intl

C$ 531American Airlines

Fri, 30 Oct - Mon, 2 Nov

2:59 p.m. - 7:20 p.m.STL Lambert-St Louis-YYZ Toronto Pearson Intl

27h 21m2 stops Atlanta Hartsfield-Jackson Tampa

5:15 p.m. - 12:41 a.m.YYZ Toronto Pearson Intl-STL Lambert-St Louis

8h 26m1 stop Orlando

C$ 540Multiple Airlines

Mon, 7 Dec - Fri, 11 Dec

8:55 a.m. - 11:49 a.m.STL Lambert-St Louis-YYZ Toronto Pearson Intl

1h 54mdirect

7:15 p.m. - 8:20 p.m.YYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 05mdirect

C$ 809Air Canada

Thu, 1 Oct - Mon, 5 Oct

12:10 p.m. - 11:18 p.m.STL Lambert-St Louis-YYZ Toronto Pearson Intl

10h 08m1 stop Montreal Pierre Elliott Trudeau Intl

7:15 p.m. - 8:20 p.m.YYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 05mdirect

C$ 860Air Canada

Thu, 1 Oct - Mon, 5 Oct

Cheap last-minute flights

Enter your travel dates to find the best prices.

10:30 p.m. - 8:09 p.m.MCI Kansas City-YYZ Toronto Pearson Intl

20h 39m1 stop Las Vegas Harry Reid Intl

1:30 p.m. - 12:52 p.m.YYZ Toronto Pearson Intl-MCI Kansas City

24h 22m2 stops Calgary Las Vegas Harry Reid Intl

C$ 940Multiple Airlines

Mon, 21 Sep - Wed, 7 Oct

5:19 p.m. - 4:40 p.m.STL Lambert-St Louis-YYZ Toronto Pearson Intl

22h 21m1 stop Orlando

7:25 a.m. - 5:54 p.m.YYZ Toronto Pearson Intl-STL Lambert-St Louis

11h 29m2 stops Boston Logan Intl Orlando

C$ 997Multiple Airlines

Thu, 17 Sep - Thu, 24 Sep

10:30 p.m. - 8:09 p.m.MCI Kansas City-YYZ Toronto Pearson Intl

20h 39m1 stop Las Vegas Harry Reid Intl

12:55 p.m. - 7:37 p.m.YYZ Toronto Pearson Intl-MCI Kansas City

31h 42m2 stops Austin Bergstrom Denver Intl

C$ 999Multiple Airlines

Mon, 21 Sep - Tue, 6 Oct

5:19 p.m. - 4:40 p.m.STL Lambert-St Louis-YYZ Toronto Pearson Intl

22h 21m1 stop Orlando

4:45 p.m. - 1:31 p.m.YYZ Toronto Pearson Intl-STL Lambert-St Louis

21h 46m2 stops Nashville Intl Jonesboro

C$ 1,042Multiple Airlines

Fri, 18 Sep - Sun, 20 Sep

8:55 a.m. - 11:49 a.m.STL Lambert-St Louis-YYZ Toronto Pearson Intl

1h 54mdirect

12:55 p.m. - 2:00 p.m.YYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 05mdirect

C$ 1,059Air Canada

Thu, 17 Sep - Thu, 24 Sep

9:00 a.m. - 9:32 p.m.STL Lambert-St Louis-YYZ Toronto Pearson Intl

11h 32m1 stop Denver Intl

12:55 p.m. - 2:00 p.m.YYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 05mdirect

C$ 1,071Multiple Airlines

Thu, 17 Sep - Thu, 24 Sep

8:30 a.m. - 5:56 p.m.STL Lambert-St Louis-YYZ Toronto Pearson Intl

8h 26m1 stop Chicago O'Hare Intl

12:00 p.m. - 6:41 p.m.YYZ Toronto Pearson Intl-STL Lambert-St Louis

7h 41m1 stop Montreal Pierre Elliott Trudeau Intl

C$ 1,084Multiple Airlines

Thu, 17 Sep - Thu, 24 Sep

12:10 p.m. - 3:41 p.m.STL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

2h 31mdirect

4:55 p.m. - 6:41 p.m.YUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

2h 46mdirect

C$ 1,113Air Canada

Thu, 17 Sep - Thu, 24 Sep

3:59 p.m. - 11:13 p.m.MCI Kansas City-YYZ Toronto Pearson Intl

6h 14m1 stop Minneapolis St Paul

7:45 a.m. - 1:34 p.m.YYZ Toronto Pearson Intl-MCI Kansas City

6h 49m1 stop Atlanta Hartsfield-Jackson

C$ 1,116Delta

Mon, 21 Sep - Wed, 7 Oct

6:00 a.m. - 1:40 p.m.MCI Kansas City-YYZ Toronto Pearson Intl

6h 40m1 stop New York LaGuardia

9:40 a.m. - 1:25 p.m.YYZ Toronto Pearson Intl-MCI Kansas City

4h 45m1 stop Detroit Metropolitan Wayne County

C$ 1,116Delta

Mon, 21 Sep - Tue, 6 Oct

Cheap direct flights

Enter your travel dates to find the best prices.

8:55 a.m. - 11:49 a.m.STL Lambert-St Louis-YYZ Toronto Pearson Intl

1h 54mdirect

7:15 p.m. - 8:20 p.m.YYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 05mdirect

C$ 809Air Canada

Thu, 1 Oct - Mon, 5 Oct

12:10 p.m. - 3:41 p.m.STL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

2h 31mdirect

4:55 p.m. - 6:41 p.m.YUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

2h 46mdirect

C$ 854Air Canada

Thu, 8 Oct - Mon, 12 Oct

2:40 p.m. - 5:34 p.m.STL Lambert-St Louis-YYZ Toronto Pearson Intl

1h 54mdirect

7:15 p.m. - 8:20 p.m.YYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 05mdirect

C$ 931Air Canada

Sun, 27 Sep - Wed, 30 Sep

2:40 p.m. - 5:34 p.m.STL Lambert-St Louis-YYZ Toronto Pearson Intl

1h 54mdirect

7:15 p.m. - 8:20 p.m.YYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 05mdirect

C$ 932Air Canada

Sun, 27 Sep - Wed, 30 Sep

2:40 p.m. - 5:34 p.m.STL Lambert-St Louis-YYZ Toronto Pearson Intl

1h 54mdirect

7:15 p.m. - 8:20 p.m.YYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 05mdirect

C$ 934Air Canada

Sun, 27 Sep - Wed, 30 Sep

8:55 a.m. - 11:49 a.m.STL Lambert-St Louis-YYZ Toronto Pearson Intl

1h 54mdirect

7:15 p.m. - 8:20 p.m.YYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 05mdirect

C$ 934Air Canada

Fri, 25 Sep - Tue, 29 Sep

2:40 p.m. - 5:34 p.m.STL Lambert-St Louis-YYZ Toronto Pearson Intl

1h 54mdirect

7:15 p.m. - 8:20 p.m.YYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 05mdirect

C$ 938Air Canada

Mon, 5 Oct - Wed, 7 Oct

4:05 p.m. - 7:05 p.m.STL Lambert-St Louis-YYZ Toronto Pearson Intl

2h 00mdirect

2:10 p.m. - 3:26 p.m.YYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 16mdirect

C$ 939Air Canada

Thu, 12 Nov - Mon, 16 Nov

4:05 p.m. - 6:59 p.m.STL Lambert-St Louis-YYZ Toronto Pearson Intl

1h 54mdirect

2:10 p.m. - 3:23 p.m.YYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 13mdirect

C$ 1,097United Airlines

Tue, 27 Oct - Thu, 29 Oct

2:40 p.m. - 5:34 p.m.STL Lambert-St Louis-YYZ Toronto Pearson Intl

1h 54mdirect

12:55 p.m. - 2:00 p.m.YYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 05mdirect

C$ 1,097United Airlines

Sun, 27 Sep - Wed, 30 Sep

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Delta flights from Missouri to Region of Ontario

Our best Delta deals on Missouri to Region of Ontario flight tickets

Delta

6 Jan

MCI5:40 p.m.Kansas City

4h 55m

1 stop

YUL11:35 p.m.Montreal Pierre Elliott Trudeau Intl

8 Jan

YUL12:45 p.m.Montreal Pierre Elliott Trudeau Intl

9h 33m

1 stop

MCI9:18 p.m.Kansas City

C$ 804

Delta

5 Jan

MCI10:45 a.m.Kansas City

7h 05m

1 stop

YUL6:50 p.m.Montreal Pierre Elliott Trudeau Intl

8 Jan

YUL6:15 p.m.Montreal Pierre Elliott Trudeau Intl

6h 43m

1 stop

MCI11:58 p.m.Kansas City

C$ 840

Delta

5 Dec

MCI11:40 a.m.Kansas City

10h 14m

1 stop

YYZ10:54 p.m.Toronto Pearson Intl

9 Dec

YYZ10:00 a.m.Toronto Pearson Intl

11h 55m

2 stops

MCI8:55 p.m.Kansas City

C$ 856

American Airlines flights from Missouri to Region of Ontario

Our best American Airlines deals on Missouri to Region of Ontario flight tickets

American Airlines

1 Oct

STL5:00 a.m.Lambert-St Louis

8h 32m

1 stop

YYZ2:32 p.m.Toronto Pearson Intl

6 Oct

YYZ1:15 p.m.Toronto Pearson Intl

12h 04m

1 stop

STL12:19 a.m.Lambert-St Louis

C$ 493

American Airlines

2 Oct

STL5:00 a.m.Lambert-St Louis

8h 32m

1 stop

YYZ2:32 p.m.Toronto Pearson Intl

7 Oct

YYZ11:40 a.m.Toronto Pearson Intl

10h 17m

1 stop

STL8:57 p.m.Lambert-St Louis

C$ 531

American Airlines

29 Oct

STL5:00 a.m.Lambert-St Louis

10h 52m

1 stop

YUL4:52 p.m.Montreal Pierre Elliott Trudeau Intl

30 Oct

YUL5:34 p.m.Montreal Pierre Elliott Trudeau Intl

18h 17m

1 stop

STL10:51 a.m.Lambert-St Louis

C$ 636

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisToronto

STL Lambert-St Louis - YYZ Toronto Pearson Intl

STLYYZ

Lambert-St Louis

Mon 7/12

6:05 p.m.-2:10 p.m.

1 stop19h 05m

Toronto Pearson Intl

Fri 11/12

5:15 p.m.-12:41 a.m.

1 stop8h 26m

C$ 492

St. LouisToronto

STL Lambert-St Louis - YYZ Toronto Pearson Intl

STLYYZ

Lambert-St Louis

Thu 8/10

5:00 a.m.-2:33 p.m.

1 stop8h 33m

Toronto Pearson Intl

Thu 15/10

11:40 a.m.-8:57 p.m.

1 stop10h 17m

C$ 493

St. LouisToronto

STL Lambert-St Louis - YYZ Toronto Pearson Intl

STLYYZ

Lambert-St Louis

Sat 17/10

5:00 a.m.-2:33 p.m.

1 stop8h 33m

Toronto Pearson Intl

Wed 28/10

1:15 p.m.-8:57 p.m.

1 stop8h 42m

C$ 493

St. LouisToronto

STL Lambert-St Louis - YYZ Toronto Pearson Intl

STLYYZ

Lambert-St Louis

Thu 1/10

5:00 a.m.-2:32 p.m.

1 stop8h 32m

Toronto Pearson Intl

Tue 6/10

1:15 p.m.-12:19 a.m.

1 stop12h 04m

C$ 493

St. LouisToronto

STL Lambert-St Louis - YYZ Toronto Pearson Intl

STLYYZ

Lambert-St Louis

Wed 11/11

6:44 p.m.-1:40 p.m.

2 stops17h 56m

Toronto Pearson Intl

Sun 15/11

8:30 p.m.-12:33 p.m.

1 stop17h 03m

C$ 513

St. LouisToronto

STL Lambert-St Louis - YYZ Toronto Pearson Intl

STLYYZ

Lambert-St Louis

Fri 2/10

5:00 a.m.-2:32 p.m.

1 stop8h 32m

Toronto Pearson Intl

Wed 7/10

11:40 a.m.-8:57 p.m.

1 stop10h 17m

C$ 531

St. LouisToronto

STL Lambert-St Louis - YYZ Toronto Pearson Intl

STLYYZ

Lambert-St Louis

Fri 30/10

7:29 a.m.-5:44 p.m.

1 stop9h 15m

Toronto Pearson Intl

Mon 2/11

11:36 a.m.-7:22 p.m.

1 stop8h 46m

C$ 531

St. LouisToronto

STL Lambert-St Louis - YYZ Toronto Pearson Intl

STLYYZ

Lambert-St Louis

Mon 7/12

2:59 p.m.-7:20 p.m.

2 stops27h 21m

Toronto Pearson Intl

Fri 11/12

5:15 p.m.-12:41 a.m.

1 stop8h 26m

C$ 540

Quickest round-trip

St. LouisToronto

STL Lambert-St Louis - YYZ Toronto Pearson Intl

STLYYZ

Lambert-St Louis

Thu 1/10

8:55 a.m.-11:49 a.m.

Nonstop1h 54m

Toronto Pearson Intl

Mon 5/10

7:15 p.m.-8:20 p.m.

Nonstop2h 05m

C$ 809

St. LouisToronto

STL Lambert-St Louis - YYZ Toronto Pearson Intl

STLYYZ

Lambert-St Louis

Thu 1/10

12:10 p.m.-11:18 p.m.

1 stop10h 08m

Toronto Pearson Intl

Mon 5/10

7:15 p.m.-8:20 p.m.

Nonstop2h 05m

C$ 860

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

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

Prices

Airlines

Other information

What is the cheapest month to fly to Region of Ontario?

In general, December is the cheapest month to fly from Missouri to Region of Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around C$ 683. If you are unable to visit Region of Ontario during the month of December, then departing from Missouri during the month March is also very affordable. Most momondo users find prices during this month for around C$ 690.

What is the cheapest day to depart on your flight to Region of Ontario?

The cheapest day to depart from Missouri to Region of Ontario is on a Saturday. Travellers who choose to depart for Region of Ontario on a Saturday will often find tickets for as low as C$ 329. The most expensive day to fly to Region of Ontario is Thursday, with ticket prices averaging around C$ 1,023.

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

Our most recent data shows that the best time of day to fly to Region of Ontario is in the afternoon. Flights from Missouri to Region of Ontario during this time can be as low as C$ 343. If you have a flexible travel schedule, then try to avoid flying at noon when prices are C$ 604 on average. Flights to Region of Ontario from Missouri at noon are generally more expensive because this time of day is more convenient for travellers’ schedules.

What is the cheapest Missouri to Ontario flight route?

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

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

There is only 1 cabin class available to choose from on Missouri to Region of Ontario 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 Missouri to Region of Ontario flights?

No. A direct flight is the cheapest option for a flight between Missouri to Region of Ontario.

Cheap Missouri to Region of Ontario flight deals and tips

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

Best price found	C$ 169
Fastest flight time	1h 54m
Direct flights	Every day
Airports in Region of Ontario	125 airports

The best one-way flight to Region of Ontario from Missouri in the past 72 hours is C$ 169. The best round-trip flight deal from Missouri to Region of Ontario found on momondo in the last 72 hours is C$ 492.

The fastest flight from Missouri to Region of Ontario takes 1h 54m

Direct flights go from Missouri to Region of Ontario every day.

There are 125 airports in Region of Ontario. From Missouri there are direct flights to Montreal Pierre Elliott Trudeau Intl (YUL), Toronto Pearson Intl (YYZ).

Search flight deals

Frequently asked questions about flying from Missouri to Ontario

When did momondo last update prices for flights from Missouri to Ontario?
Prices for flights from Missouri to Ontario are refreshed on a daily basis.
How many operators does momondo search for flights from Missouri to Ontario?
The number of operators available for flights from Missouri to Ontario is 1 as of September 2026.
How old do you have to be to fly from Missouri to Ontario?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Missouri to Ontario.
What documentation or ID do you need to fly to Ontario?
The travel and health documents required for your trip to Ontario can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Ontario. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular plane model from Missouri to Region of Ontario?
momondo data reveals that the most frequently booked plane model on the route from Missouri to Region of Ontario is Canadair (Bombardier) Regional Jet 900, representing 51.25% of all bookings. The subsequent popular models are Embraer 175 at 26.25%, Boeing 787-8 Dreamliner at 5.62%, and Boeing 737 MAX 8 at 3.75%.

Best airlines flying from Missouri to Region of Ontario

Compare and see reviews for airlines that fly from Missouri to Region of Ontario with momondo

Airline	Rating	Free Cancellation	Price
Air Canada	PriceFrom C$ 329	Free Cancellation	Rating 7.1 11,630 reviews		Search Air Canada flights

Why use momondo?

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

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

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

Flights from Missouri to Ontario with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Missouri to Ontario.

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

Of course. momondo tracks the price of Missouri to Ontario flights. All you need is a valid email address and we will do the rest; it is that quick and easy.