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

2 flights are operational weekly from Ontario to Missouri as of May 2026. The most popular departure day for this route is Mon, with 50% of flights per week taking off on this day.

What airlines fly to Missouri?

Southwest, American Airlines and Delta are the top three most popular airlines that fly to Missouri from Ontario according to our data. Southwest is the first choice among our users, with 40% of people opting to fly with this airline when traveling to Missouri. Keep in mind that there are 9 different airlines that fly to Missouri on a routine basis, so you have a few additional options to choose from.

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

Frontier, Southwest, and Delta are the most popular carriers operating from Ontario to Missouri

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

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

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

As of May 2026, there are 5 operators available to choose from for flights from Ontario Airport to Missouri.

How old do you have to be to fly from Ontario Airport 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 Airport to Missouri.

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

The travel and health documents required for your trip to Missouri 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 Missouri. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$85 Cheap Flights from Ontario to Missouri in 2026

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Find the cheapest flights from Ontario to Missouri

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:00 am - 7:23 pm

ONT

STL

11h 23m

1 stop

6:30 pm - 8:04 am

STL

ONT

15h 34m

1 stop

$180Frontier

Sat, May 16 - Sat, May 23

11:36 am - 6:06 pm

ONT

STL

28h 30m

1 stop

8:08 pm - 10:05 am

STL

ONT

15h 57m

1 stop

$181Frontier

Mon, May 18 - Tue, May 26

10:49 am - 7:23 pm

ONT

STL

6h 34m

1 stop

8:08 pm - 11:50 pm

STL

ONT

5h 42m

1 stop

$182Frontier

Wed, Aug 12 - Sat, Aug 15

6:00 am - 7:23 pm

ONT

STL

11h 23m

1 stop

6:03 pm - 7:51 pm

STL

ONT

27h 48m

1 stop

$187Frontier

Tue, Jun 2 - Tue, Jun 9

12:00 pm - 10:32 pm

ONT

SGF

8h 32m

1 stop

3:30 pm - 10:14 pm

SGF

ONT

8h 44m

1 stop

$329Delta

Wed, Oct 14 - Wed, Oct 21

12:00 pm - 10:32 pm

ONT

SGF

8h 32m

1 stop

3:30 pm - 11:48 pm

SGF

ONT

10h 18m

2 stops

$334Delta

Wed, Oct 14 - Wed, Oct 21

11:59 pm - 10:30 am

ONT

SGF

8h 31m

1 stop

7:30 pm - 11:59 pm

SGF

ONT

6h 29m

1 stop

$352American Airlines

Sat, May 30 - Wed, Jun 10

11:59 pm - 10:24 am

ONT

SGF

8h 25m

1 stop

7:30 pm - 11:59 pm

SGF

ONT

6h 29m

1 stop

$364American Airlines

Tue, May 19 - Tue, Jun 2

6:10 am - 2:50 pm

ONT

COU

6h 40m

1 stop

3:25 pm - 10:51 pm

COU

ONT

9h 26m

1 stop

$408United Airlines

Sat, Aug 8 - Mon, Aug 10

6:10 am - 2:50 pm

ONT

COU

6h 40m

1 stop

3:25 pm - 10:51 pm

COU

ONT

9h 26m

1 stop

$409United Airlines

Sat, Aug 1 - Tue, Aug 4

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Frontier flights from Ontario to Missouri

Our best Frontier deals on Ontario to Missouri flight tickets

Frontier

May 16

ONT6:00 amOntario

11h 23m

1 stop

STL7:23 pmLambert-St Louis

May 23

STL6:30 pmLambert-St Louis

15h 34m

1 stop

ONT8:04 amOntario

$180

Frontier

May 18

ONT11:36 amOntario

28h 30m

1 stop

STL6:06 pmLambert-St Louis

May 26

STL8:08 pmLambert-St Louis

15h 57m

1 stop

ONT10:05 amOntario

$181

Frontier

Aug 12

ONT10:49 amOntario

6h 34m

1 stop

STL7:23 pmLambert-St Louis

Aug 15

STL8:08 pmLambert-St Louis

5h 42m

1 stop

ONT11:50 pmOntario

$182

American Airlines flights from Ontario to Missouri

Our best American Airlines deals on Ontario to Missouri flight tickets

American Airlines

May 30

ONT11:59 pmOntario

8h 31m

1 stop

SGF10:30 amSpringfield-Branson

Jun 10

SGF7:30 pmSpringfield-Branson

6h 29m

1 stop

ONT11:59 pmOntario

$352

American Airlines

May 19

ONT11:59 pmOntario

8h 25m

1 stop

SGF10:24 amSpringfield-Branson

Jun 2

SGF7:30 pmSpringfield-Branson

6h 29m

1 stop

ONT11:59 pmOntario

$364

American Airlines

May 19

ONT9:24 amOntario

7h 47m

2 stops

SGF7:11 pmSpringfield-Branson

Jun 2

SGF6:43 pmSpringfield-Branson

7h 16m

1 stop

ONT11:59 pmOntario

$369

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

Sat 5/16

6:00 am-7:23 pm

1 stop11h 23m

Lambert-St Louis

Sat 5/23

6:30 pm-8:04 am

1 stop15h 34m

$180

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

Mon 5/18

11:36 am-6:06 pm

1 stop28h 30m

Lambert-St Louis

Tue 5/26

8:08 pm-10:05 am

1 stop15h 57m

$181

Quickest round-trip

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

Wed 8/12

10:49 am-7:23 pm

1 stop6h 34m

Lambert-St Louis

Sat 8/15

8:08 pm-11:50 pm

1 stop5h 42m

$182

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

Tue 6/2

6:00 am-7:23 pm

1 stop11h 23m

Lambert-St Louis

Tue 6/9

6:03 pm-7:51 pm

1 stop27h 48m

$187

OntarioSpringfield

ONT - SGF

ONTSGF

Ontario

Wed 10/14

12:00 pm-10:32 pm

1 stop8h 32m

Springfield-Branson

Wed 10/21

3:30 pm-10:14 pm

1 stop8h 44m

$329

OntarioSpringfield

ONT - SGF

ONTSGF

Ontario

Wed 10/14

12:00 pm-10:32 pm

1 stop8h 32m

Springfield-Branson

Wed 10/21

3:30 pm-11:48 pm

2 stops10h 18m

$334

OntarioSpringfield

ONT - SGF

ONTSGF

Ontario

Sat 5/30

11:59 pm-10:30 am

1 stop8h 31m

Springfield-Branson

Wed 6/10

7:30 pm-11:59 pm

1 stop6h 29m

$352

OntarioSpringfield

ONT - SGF

ONTSGF

Ontario

Tue 5/19

11:59 pm-10:24 am

1 stop8h 25m

Springfield-Branson

Tue 6/2

7:30 pm-11:59 pm

1 stop6h 29m

$364

OntarioColumbia

ONT - COU

ONTCOU

Ontario

Sat 8/8

6:10 am-2:50 pm

1 stop6h 40m

Columbia Regional

Mon 8/10

3:25 pm-10:51 pm

1 stop9h 26m

$408

OntarioColumbia

ONT - COU

ONTCOU

Ontario

Sat 8/1

6:10 am-2:50 pm

1 stop6h 40m

Columbia Regional

Tue 8/4

3:25 pm-10:51 pm

1 stop9h 26m

$409

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 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

Prices

Airlines

Other information

What is the cheapest month to fly to Missouri?

In general, September is the cheapest month to fly from Ontario to Missouri. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $71. If you aren’t able to travel to Missouri during the month of September, then flying in August is also cheap. Prices for this month can be found on momondo for an average of $98.

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

You are more likely to see cheaper flights to Missouri from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Missouri for around $331 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Missouri from Ontario for as low as $240 on momondo.

Cheap Ontario to Missouri flight deals and tips

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

Fastest flight time	5h 00m
Direct flights	None

The fastest flight from Ontario to Missouri takes 5h 00m

There are no direct flights from Ontario to Missouri. There are no popular flight routes from Ontario to Missouri.

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Frequently asked questions about flying from Ontario to Missouri

When did momondo last update prices for flights from Ontario Airport to Missouri?
Prices for flights from Ontario Airport to Missouri were last updated today.
How many operators does momondo search for flights from Ontario Airport to Missouri?
As of May 2026, there are 5 operators available to choose from for flights from Ontario Airport to Missouri.
How old do you have to be to fly from Ontario Airport 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 Airport to Missouri.
What documentation or ID do you need to fly to Missouri?
The travel and health documents required for your trip to Missouri 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 Missouri. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Ontario to Missouri

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

Airline	Rating	Free Cancellation	Price
Delta	PriceFrom $98	Free Cancellation	Rating 7.9 8,458 reviews	Search Delta flights
Frontier	PriceFrom $121	Free Cancellation	Rating 5.6 2,964 reviews	Search Frontier flights
United Airlines	PriceFrom $236	Free Cancellation	Rating 7.4 9,684 reviews	Search United Airlines flights
Southwest	PriceFrom $247	Free Cancellation	Rating 7.9 4,305 reviews	Search Southwest flights
American Airlines	PriceFrom $259	Free Cancellation	Rating 7.1 11,666 reviews	Search American Airlines flights

Why use momondo?

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

Finding the right flight to Missouri from Ontario is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Missouri quick and easy, saving you time and money.

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

momondo does allow users to show only those flights to Missouri from Ontario which offer a flexible booking policy as well as other useful filters and features.

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

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 Ontario to Missouri.

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

Yes. momondo can track prices for Ontario to Missouri flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.