Latest deals
Insights
FAQs
Reviews
Price Alerts

Cheap flights from Ontario to Missouri from $103

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 8/26. 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

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Ontario to Missouri

Cheap round-trip flights

Frontier Logo
12:59 am - 9:11 amONT-STL
6h 12m1 stop
Frontier Logo
7:54 pm - 11:50 pmSTL-ONT
5h 56m1 stop
$206Frontier
Find Deal
mar., ago. 26 - mar., sep. 2
Frontier Logo
12:59 am - 9:07 amONT-STL
6h 08m1 stop
Frontier Logo
7:52 pm - 11:50 pmSTL-ONT
5h 58m1 stop
$215Frontier
Find Deal
lun., oct. 27 - mié., nov. 5
American Airlines Logo
11:59 pm - 9:38 amONT-SGF
7h 39m1 stop
American Airlines Logo
3:13 pm - 9:36 pmSGF-ONT
8h 23m1 stop
$269American Airlines
Find Deal
mar., oct. 14 - mar., oct. 21
American Airlines Logo
6:20 am - 1:40 pmONT-STL
5h 20m1 stop
American Airlines Logo
9:38 am - 4:01 pmSTL-ONT
8h 23m2 stops
$284American Airlines
Find Deal
mié., nov. 5 - sáb., nov. 8
Delta Logo
11:45 am - 10:02 pmONT-STL
8h 17m1 stop
Delta Logo
7:35 am - 12:14 pmSTL-ONT
6h 39m1 stop
$286Delta
Find Deal
mié., sep. 3 - dom., sep. 7
Southwest Logo
5:50 am - 1:10 pmONT-MCI
5h 20m1 stop
Southwest Logo
8:25 pm - 11:05 pmMCI-ONT
4h 40m1 stop
$292Southwest
Find Deal
lun., sep. 8 - dom., sep. 14
Delta Logo
4:50 pm - 11:59 pmONT-MCI
5h 09m1 stop
Delta Logo
6:40 am - 12:14 pmMCI-ONT
7h 34m1 stop
$297Delta
Find Deal
dom., ago. 24 - sáb., ago. 30
Southwest Logo
8:40 am - 5:20 pmONT-STL
6h 40m2 stops
Southwest Logo
1:45 pm - 7:00 pmSTL-ONT
7h 15m2 stops
$309Southwest
Find Deal
mié., nov. 5 - sáb., nov. 8
United Airlines Logo
6:00 am - 2:36 pmONT-SGF
6h 36m1 stop
United Airlines Logo
2:55 pm - 9:25 pmSGF-ONT
8h 30m1 stop
$366United Airlines
Find Deal
mar., ago. 12 - sáb., ago. 30
United Airlines Logo
1:19 pm - 8:46 pmONT-STL
5h 27m1 stop
United Airlines Logo
1:39 pm - 8:33 pmSTL-ONT
8h 54m2 stops
$374United Airlines
Find Deal
mié., ago. 27 - mié., sep. 3

Frontier flights from Ontario to Missouri

Our best Frontier deals on Ontario to Missouri flight tickets
Frontier
Aug 5
ONT5:21 pmOntario
23h 02m
1 stop
MCI6:23 pmKansas City
Aug 13
MCI7:20 pmKansas City
6h 30m
1 stop
ONT11:50 pmOntario
$205
Find similar
Frontier
Aug 26
ONT12:59 amOntario
6h 12m
1 stop
STL9:11 amLambert-St Louis
Sep 2
STL7:54 pmLambert-St Louis
5h 56m
1 stop
ONT11:50 pmOntario
$206
Find similar
Frontier
Aug 5
ONT12:59 amOntario
15h 24m
1 stop
MCI6:23 pmKansas City
Aug 13
MCI7:20 pmKansas City
6h 30m
1 stop
ONT11:50 pmOntario
$207
Find similar

Alaska Airlines flights from Ontario to Missouri

Our best Alaska Airlines deals on Ontario to Missouri flight tickets
Alaska Airlines
Oct 28
ONT4:11 pmOntario
21h 07m
1 stop
STL3:18 pmLambert-St Louis
Nov 5
STL7:00 amLambert-St Louis
10h 17m
1 stop
ONT3:17 pmOntario
$279
Find similar
Alaska Airlines
Aug 22
ONT3:04 pmOntario
6h 55m
1 stop
MCI11:59 pmKansas City
Aug 25
MCI3:37 pmKansas City
10h 22m
1 stop
ONT11:59 pmOntario
$296
Find similar
Alaska Airlines
Sep 10
ONT6:00 amOntario
9h 34m
1 stop
STL5:34 pmLambert-St Louis
Sep 23
STL3:35 pmLambert-St Louis
19h 51m
2 stops
ONT9:26 amOntario
$326
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 julio 31, 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

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

mar. 8/26

12:59 am-9:11 am

1 stop6h 12m

Lambert-St Louis

mar. 9/2

7:54 pm-11:50 pm

1 stop5h 56m

$206

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

lun. 10/27

12:59 am-9:07 am

1 stop6h 08m

Lambert-St Louis

mié. 11/5

7:52 pm-11:50 pm

1 stop5h 58m

$215

OntarioSpringfield

ONT - SGF

ONTSGF

Ontario

mar. 10/14

11:59 pm-9:38 am

1 stop7h 39m

Springfield-Branson

mar. 10/21

3:13 pm-9:36 pm

1 stop8h 23m

$269

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

mié. 11/5

6:20 am-1:40 pm

1 stop5h 20m

Lambert-St Louis

sáb. 11/8

9:38 am-4:01 pm

2 stops8h 23m

$284

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

mié. 9/3

11:45 am-10:02 pm

1 stop8h 17m

Lambert-St Louis

dom. 9/7

7:35 am-12:14 pm

1 stop6h 39m

$286

OntarioKansas City

ONT - MCI

ONTMCI

Ontario

lun. 9/8

5:50 am-1:10 pm

1 stop5h 20m

Kansas City

dom. 9/14

8:25 pm-11:05 pm

1 stop4h 40m

$292

OntarioKansas City

ONT - MCI

ONTMCI

Ontario

dom. 8/24

4:50 pm-11:59 pm

1 stop5h 09m

Kansas City

sáb. 8/30

6:40 am-12:14 pm

1 stop7h 34m

$297

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

mié. 11/5

8:40 am-5:20 pm

2 stops6h 40m

Lambert-St Louis

sáb. 11/8

1:45 pm-7:00 pm

2 stops7h 15m

$309

OntarioSpringfield

ONT - SGF

ONTSGF

Ontario

mar. 8/12

6:00 am-2:36 pm

1 stop6h 36m

Springfield-Branson

sáb. 8/30

2:55 pm-9:25 pm

1 stop8h 30m

$366

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

mié. 8/27

1:19 pm-8:46 pm

1 stop5h 27m

Lambert-St Louis

mié. 9/3

1:39 pm-8:33 pm

2 stops8h 54m

$374

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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, August 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 $263. If you aren’t able to travel to Missouri during the month of August, then flying in September is also cheap. Prices for this month can be found on momondo for an average of $267.

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 $351 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 $251 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

Best Price Found

$103

Fastest flight time

5h 01m

Direct flights

None

Airports in Missouri

4 airports
The best one-way flight to Missouri from Ontario in the past 72 hours is $103. The best round-trip flight deal from Ontario to Missouri found on momondo in the last 72 hours is $206.
The fastest flight from Ontario to Missouri takes 5h 01m
There are no direct flights from Ontario to Missouri. Popular non-direct routes for this connection are Ontario Airport - Springfield-Branson Airport, Ontario Airport - Lambert-St Louis Airport and Ontario Airport - Kansas City Airport.
There are 4 airports near Missouri: Kansas City (MCI), Springfield-Branson (SGF), Columbia Regional (COU), Lambert-St Louis (STL)
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
FrontierPriceFrom $108Free CancellationRating
5.9
3,239 reviews
Search Frontier flights
SouthwestPriceFrom $247Free CancellationRating
8.0
4,246 reviews
Search Southwest flights
American AirlinesPriceFrom $268Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
United AirlinesPriceFrom $278Free CancellationRating
7.4
8,900 reviews
Search United Airlines flights
DeltaPriceFrom $284Free CancellationRating
8.0
7,981 reviews
Search Delta 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.

An easier way to manage your Missouri trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
mar. 8/5
mar. 8/12
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Missouri

Popular cities in Missouri

Popular flights according to clicks in the last 7 days on momondo
Flights to New Yorkfrom $39
Flights to Los Angelesfrom $37
Flights to Miamifrom $58
Flights to Chicagofrom $59
Flights to Orlandofrom $54
Flights to Las Vegasfrom $35
Flights to San Franciscofrom $49
Flights to Washington, D.C.from $49
Flights to Bostonfrom $77
Flights to Atlantafrom $29
Flights to Dallasfrom $55
Flights to Seattlefrom $93