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Cheap flights from Ontario to Missouri from $52

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 2/18. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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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.
Frontier Logo
6:00 am - 7:51 pmONT-MCI
11h 51m1 stop
Frontier Logo
5:46 pm - 10:39 pmMCI-ONT
6h 53m1 stop
$128Frontier
Find Deal
Sat, Feb 14 - Wed, Feb 18
Frontier Logo
6:10 am - 7:42 pmONT-MCI
11h 32m1 stop
Frontier Logo
8:27 pm - 3:07 pmMCI-ONT
20h 40m1 stop
$153Frontier
Find Deal
Fri, Jan 16 - Mon, Jan 19
Frontier Logo
2:59 pm - 12:12 pmONT-STL
19h 13m1 stop
Frontier Logo
7:36 pm - 11:59 pmSTL-ONT
6h 23m1 stop
$156Frontier
Find Deal
Thu, Dec 11 - Mon, Jan 19
Frontier Logo
6:00 am - 7:51 pmONT-MCI
11h 51m1 stop
Frontier Logo
5:46 pm - 6:01 pmMCI-ONT
26h 15m2 stops
$162Frontier
Find Deal
Sat, Feb 14 - Wed, Feb 18
Multiple Airlines Logo
3:04 pm - 11:33 pmONT-MCI
6h 29m1 stop
Multiple Airlines Logo
8:41 pm - 12:20 amMCI-ONT
5h 39m1 stop
$163Multiple Airlines
Find Deal
Sat, Jan 24 - Sun, Jan 25
Multiple Airlines Logo
3:04 pm - 11:33 pmONT-MCI
6h 29m1 stop
Multiple Airlines Logo
8:41 pm - 12:10 pmMCI-ONT
17h 29m2 stops
$189Multiple Airlines
Find Deal
Sat, Jan 24 - Sun, Jan 25
American Airlines Logo
11:59 pm - 8:36 amONT-SGF
6h 37m1 stop
American Airlines Logo
6:00 am - 10:08 amSGF-ONT
6h 08m1 stop
$269American Airlines
Find Deal
Thu, Jan 8 - Tue, Jan 20
American Airlines Logo
12:57 pm - 10:47 pmONT-SGF
7h 50m2 stops
American Airlines Logo
6:34 pm - 10:48 pmSGF-ONT
6h 14m1 stop
$274American Airlines
Find Deal
Sat, Feb 7 - Mon, Feb 9
United Airlines Logo
1:24 pm - 8:33 pmONT-COU
5h 09m1 stop
United Airlines Logo
9:00 am - 12:43 pmCOU-ONT
5h 43m1 stop
$338United Airlines
Find Deal
Tue, Feb 10 - Sat, Feb 14
United Airlines Logo
6:00 am - 1:58 pmONT-SGF
5h 58m1 stop
United Airlines Logo
5:03 pm - 8:58 pmSGF-ONT
5h 55m1 stop
$349United Airlines
Find Deal
Thu, Jan 8 - Sat, Jan 10

Delta flights from Ontario to Missouri

Our best Delta deals on Ontario to Missouri flight tickets
Delta
Dec 31
ONT1:15 pmOntario
6h 19m
1 stop
STL9:34 pmLambert-St Louis
Jan 6
STL5:00 pmLambert-St Louis
7h 38m
1 stop
ONT10:38 pmOntario
$307
Find similar
Delta
Dec 31
ONT1:15 pmOntario
6h 19m
1 stop
STL9:34 pmLambert-St Louis
Jan 4
STL7:20 amLambert-St Louis
7h 09m
1 stop
ONT12:29 pmOntario
$362
Find similar
Delta
Dec 30
ONT10:29 pmOntario
8h 29m
1 stop
STL8:58 amLambert-St Louis
Jan 6
STL5:00 pmLambert-St Louis
7h 38m
1 stop
ONT10:38 pmOntario
$363
Find similar

Frontier flights from Ontario to Missouri

Our best Frontier deals on Ontario to Missouri flight tickets
Frontier
Feb 14
ONT6:00 amOntario
11h 51m
1 stop
MCI7:51 pmKansas City
Feb 18
MCI5:46 pmKansas City
6h 53m
1 stop
ONT10:39 pmOntario
$128
Find similar
Frontier
Jan 16
ONT6:10 amOntario
11h 32m
1 stop
MCI7:42 pmKansas City
Jan 19
MCI8:27 pmKansas City
20h 40m
1 stop
ONT3:07 pmOntario
$153
Find similar
Frontier
Dec 11
ONT2:59 pmOntario
19h 13m
1 stop
STL12:12 pmLambert-St Louis
Jan 19
STL7:36 pmLambert-St Louis
6h 23m
1 stop
ONT11:59 pmOntario
$156
Find similar

momondo 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, momondo users made 832,500 searches. Data last updated November 29, 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

OntarioKansas City

ONT - MCI

ONTMCI

Ontario

Sat 2/14

6:00 am-7:51 pm

1 stop11h 51m

Kansas City

Wed 2/18

5:46 pm-10:39 pm

1 stop6h 53m

$128

OntarioKansas City

ONT - MCI

ONTMCI

Ontario

Fri 1/16

6:10 am-7:42 pm

1 stop11h 32m

Kansas City

Mon 1/19

8:27 pm-3:07 pm

1 stop20h 40m

$153

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

Thu 12/11

2:59 pm-12:12 pm

1 stop19h 13m

Lambert-St Louis

Mon 1/19

7:36 pm-11:59 pm

1 stop6h 23m

$156

OntarioKansas City

ONT - MCI

ONTMCI

Ontario

Sat 2/14

6:00 am-7:51 pm

1 stop11h 51m

Kansas City

Wed 2/18

5:46 pm-6:01 pm

2 stops26h 15m

$162

OntarioKansas City

ONT - MCI

ONTMCI

Ontario

Sat 1/24

3:04 pm-11:33 pm

1 stop6h 29m

Kansas City

Sun 1/25

8:41 pm-12:20 am

1 stop5h 39m

$163

OntarioKansas City

ONT - MCI

ONTMCI

Ontario

Sat 1/24

3:04 pm-11:33 pm

1 stop6h 29m

Kansas City

Sun 1/25

8:41 pm-12:10 pm

2 stops17h 29m

$189

OntarioSpringfield

ONT - SGF

ONTSGF

Ontario

Thu 1/8

11:59 pm-8:36 am

1 stop6h 37m

Springfield-Branson

Tue 1/20

6:00 am-10:08 am

1 stop6h 08m

$269

OntarioSpringfield

ONT - SGF

ONTSGF

Ontario

Sat 2/7

12:57 pm-10:47 pm

2 stops7h 50m

Springfield-Branson

Mon 2/9

6:34 pm-10:48 pm

1 stop6h 14m

$274

OntarioColumbia

ONT - COU

ONTCOU

Ontario

Tue 2/10

1:24 pm-8:33 pm

1 stop5h 09m

Columbia Regional

Sat 2/14

9:00 am-12:43 pm

1 stop5h 43m

$338

OntarioSpringfield

ONT - SGF

ONTSGF

Ontario

Thu 1/8

6:00 am-1:58 pm

1 stop5h 58m

Springfield-Branson

Sat 1/10

5:03 pm-8:58 pm

1 stop5h 55m

$349

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 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, January 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 $212. If you aren’t able to travel to Missouri during the month of January, then flying in September is also cheap. Prices for this month can be found on momondo for an average of $241.

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

The cheapest day to depart from Ontario to Missouri is on a Monday when prices can be found for as low as $261. Flights from Ontario to Missouri on a Sunday will generally be more expensive and average around $417. 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 evening. momondo users have found flights departing from Ontario to Missouri in the evening for as low as $189. 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 in the afternoon, with an average ticket price of $461. Departure times in the afternoon fall within the peak daily travel times, which is why tickets can be more expensive.

How far in advance should I book a flight 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 $348 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 $296 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

4h 55m

Direct flights

None
The fastest flight from Ontario to Missouri takes 4h 55m
There are no direct flights from Ontario to Missouri. There are no popular flight routes from Ontario to Missouri.
Search flight deals

  • 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?

  • 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
DeltaPriceFrom $98Free CancellationRating
7.9
8,012 reviews
Search Delta flights
FrontierPriceFrom $115Free CancellationRating
5.8
3,100 reviews
Search Frontier flights
SouthwestPriceFrom $247Free CancellationRating
8.0
4,255 reviews
Search Southwest flights
United AirlinesPriceFrom $256Free CancellationRating
7.4
9,058 reviews
Search United Airlines flights
American AirlinesPriceFrom $268Free CancellationRating
7.2
11,044 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.

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