$64 Find Cheap Flights from Ontario to Missouri

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Missouri departing on 1/13. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Missouri

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Missouri, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Missouri, as well as popular online travel agencies
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Flight Deals

Cheap Flights from Ontario to Missouri

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
St. Louis
St. Louis1 stop$145
Kansas City
Kansas City1 stop$153
Springfield
Springfield1 stop$289
Columbia
Columbia1 stop$328
Joplin
Joplin1 stop$364
St. Louis
St. Louis1 stop$145
Kansas City
Kansas City1 stop$153
Springfield
Springfield1 stop$289
Columbia
Columbia1 stop$328
Joplin
Joplin1 stop$364

Book Cheap Ontario to Missouri Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Missouri that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ontario to Missouri

Fri, Feb 20 - Sat, Feb 28
Frontier Logo
8:07 am - 9:26 pm
ONT
-
STL
11h 19m1 stop
Frontier Logo
2:51 pm - 11:59 pm
STL
-
ONT
11h 08m1 stop
$145Frontier
Mon, Jan 26 - Fri, Jan 30
Frontier Logo
6:20 am - 7:51 pm
ONT
-
MCI
11h 31m1 stop
Frontier Logo
8:41 pm - 11:24 pm
MCI
-
ONT
28h 43m1 stop
$153Frontier
Fri, Jan 30 - Sun, Feb 1
Frontier Logo
10:18 am - 8:48 pm
ONT
-
STL
8h 30m1 stop
Frontier Logo
9:32 pm - 12:10 pm
STL
-
ONT
16h 38m1 stop
$163Frontier
Wed, Jan 14 - Sat, Jan 24
Frontier Logo
7:15 am - 2:48 pm
ONT
-
STL
5h 33m1 stop
Frontier Logo
3:46 pm - 11:24 pm
STL
-
ONT
9h 38m1 stop
$165Frontier
Wed, Jan 21 - Sat, Jan 31
Multiple Airlines Logo
3:07 pm - 11:33 pm
ONT
-
MCI
6h 26m1 stop
Multiple Airlines Logo
7:00 am - 1:34 pm
MCI
-
ONT
8h 34m1 stop
$186Multiple Airlines
Fri, Jan 23 - Sun, Jan 25
Multiple Airlines Logo
2:28 pm - 11:33 pm
ONT
-
MCI
7h 05m1 stop
Multiple Airlines Logo
8:41 pm - 12:20 am
MCI
-
ONT
5h 39m1 stop
$199Multiple Airlines
Sat, Feb 7 - Mon, Feb 9
American Airlines Logo
7:16 am - 3:58 pm
ONT
-
SGF
6h 42m1 stop
American Airlines Logo
6:34 pm - 10:48 pm
SGF
-
ONT
6h 14m1 stop
$289American Airlines
Sat, Feb 7 - Mon, Feb 9
American Airlines Logo
9:59 am - 9:19 pm
ONT
-
SGF
9h 20m2 stops
American Airlines Logo
6:34 pm - 10:48 pm
SGF
-
ONT
6h 14m1 stop
$294American Airlines
Sat, Jan 10 - Sun, Jan 18
United Airlines Logo
5:05 am - 12:45 pm
ONT
-
SGF
5h 40m1 stop
United Airlines Logo
3:00 pm - 9:58 pm
SGF
-
ONT
8h 58m1 stop
$314United Airlines
Sat, Jan 10 - Sun, Jan 18
United Airlines Logo
5:05 am - 12:45 pm
ONT
-
SGF
5h 40m1 stop
United Airlines Logo
7:45 am - 5:43 pm
SGF
-
ONT
11h 58m2 stops
$319United Airlines
Booking Insights

KAYAK's insights & trends for Ontario to Missouri flights

Get data-powered insights and trends into flights from Ontario to Missouri to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from Ontario to Missouri?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to Missouri, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Ontario to Missouri is September, when tickets cost $241 (return) on average. On the other hand, the most expensive months are March and December, when the average cost of round-trip tickets is $480 and $451 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Ontario to Missouri, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Ontario to Missouri, you should book around 2 weeks before departure, which saves you about 23% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 5 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$64
Best time to beat the crowds with an average 12% drop in price.
Most popular time to fly with an average 8% increase in price.
Flight from Ontario to St. Louis

FAQs - booking Missouri flights

  • How does KAYAK find such low prices on flights from Ontario to Missouri?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to Missouri.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Missouri?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Ontario to Missouri is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Ontario to Missouri?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Ontario to Missouri with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to Missouri?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Ontario to Missouri up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to Missouri?

    The cheapest time of day to fly to Missouri is generally at night, when round-trip flights cost $189 on average. Morning departures are around 100% cheaper than evening flights, on average. The most expensive time of day to fly to Missouri is generally in the evening, which is peak travel time and where the average cost of a ticket is $461.

Reviews of the top 5 airlines serving from Ontario to Missouri

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Missouri. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Ontario to Missouri? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4256 reviews
8.0Comfort
8.6Crew
7.0Food
8.1Boarding
7.5Entertainment
Airline reviews

The boarding and seat assignment system no longer works for me, but I know it is being replaced. Otherwise, I am good with the overall experience.

8.0 ExcellentRussell, Dec 2025
SAN - OAK
Read more Southwest reviews

The boarding and seat assignment system no longer works for me, but I know it is being replaced. Otherwise, I am good with the overall experience.

The lead steward kept singing about "San Francisco" and hotel California---more annoying than humorous....needs work. Flight was smooth and on time.

San Diego airport is brand new, spacious, airy and very smooth checkin at SW baggage drop.

Crew could have been friendlier, maybe I'm spoiled by SW crews. In flight wifi was good. Would be nice to have more food offerings on a 4 plus hour flight

Ever since Southwest starting charging for bags, passengers don't want to pay to check their bags, so the gate agents have to beg people to check their roller bags now because there's "not enough space". This was a terrible business move by Southwest.

Sacrament staff are always polite and helpful. Airport is easy to maneuver and boarding is straightforward.

Boarded on time but once we were ready for take off, the crew determined that, although every seat was taken, somehow someone was on the wrong flight. Delay, delay delay, announcements and ended up with one person checking EVERY ID against their passenger Manifest only to figure out it was a "clerical error." We departed 54 minutes late causing me to run in the St. Louis Airport to make my connection and lose the priority boarding spot I had paid for. Unnecessary delay.

Flight was delayed due to plane not passing inspection And one of the crew had to time out and we had to wait for another one A 3 hour delay

As always, the entire Southwest experience was wonderful, from online booking to flight to baggage retrieval. Very grateful.

The weather could have been better. There was a 40 minute ATC delay in SFO because of marine fog and a micro cell storm delayed landing and take-off at Nashville. The gate was changed 5 minutes from boarding from gate B3 to gate C23 at Nashville airport.

The flight was delayed for about 2 hrs. Other than it, it was good.

I am extremely disappointed that delta internal pilot manuals now refer to the Gulf of Mexico as the “gulf of America”. You can bow down to the Orange turd on your own. I will never fly delta again

No lunch on a x-country flight scheduled for 10:50 am departure, arrived 5+ hrs later. That requires a black box label before you pay for the tickets. Worst, when I checked in online, it's specifically said that lunch was served on his flight for economy Plus passengers.

Our flight from SFO to MSP was right on time on 11/15/2025. No delays. As we approached MSP at about 8 pm, we circled in the air until 8:40 pm so I don't call that efficient for MSP. I think the captain should announce the delay and why. (as if we all don't know that we are just circling around the area, slowing down, speeding up, slowing down.) Thank you. Marilyn Fischer

Staff were friendly and happy. Delta could make sure passengers that don't have the app know of changes. Without Kayak I would not have known about the change of gate or the delay. Kayak was faster to notify me.

The flight used a B767 with a very old interior from before 2014. The entertainment system did not work at all during the flight despite attempts to reset the system. It was like they flew this route just to be competitive.

Delayed flight (1hour) plus a long layover after an overnight flight with no backup plane available.

The boarding process needs to be refined. Sometimes the gate crew calls out the zones and then flip to showing the.zones boarding on the gate monitor display. So, unless you are huddled around the gate lanes watching the monitor, you could miss your boarding zone. Suggest the zones be announced each time a new zone is allowed to board.

Flight delayed for two and half hours and then canceled altogether due to mechanical issues. No mechanic onsite to fix so had to send one from LAX.

This route with Delta always has delays or is cancelled. Aircrafts seem smaller and older. I fly Delta quite a bit - haven’t had issues with the international flights. But this route has always been the troublesome one

Pushed back only to get deplaned due to a tire damaged by ground crew. They did at least go pretty fast. The bathrooms should be banned under the Geneva convention. No room to even sit straight on the toilet. The under-seat entertainment units block what little leg room there is.

Essy to get on. The hostess gave very little pop, the plane was late getting in, and we are still waiting for our bags. This sucks. :/

United airlines has the best customer experience from booking to arrival. I always fly United airlines. The mileage program is excellent

Older aircraft, no meal, only food was for purchase. Not impressed United.

Not pleasant trip cross country when the entertainment and WiFi system not working. No entertainment for entirety of route. Staff was rather nonchalant in that they dismissed the problem due to age of plane. It would have been nice to know this up front so I could have come prepared to read or download movies before boarding Coincidentally or not, there was a similar issue with the entertainment system on my previous flight I took on my fist leg of the trip. There are no seat TVs, so you must rely on the app when it works. United can do better. Also, what use it it to pay for boarding group 2 when half of the passengers are in the same line as you?

Premium Plus is a really good idea for longer flights

Lately I like the planes have been exceptionally filthy. There’s lines of dust and dirt all across the ceiling in the vents, and the cracks in between the seats are literally full of food. It’s definitely not the quality of service that I was used to with United. I’m also very disappointed with the Wi-Fi! All I wanna do is knock out a few work jobs while I’m trapped in my seat And it spools so bad. They did provide me with a refund, but the process of getting that refund is so complicated. It’s unfortunate.

Excellent flight. Smooth, efficient boarding. Quick flight. Arrived early at STL.

The flight attendants were great, I joked with one I can’t remember her name, a blond, really sweet. I thought it was run well very professional. This was great i survived Spirit, I know for which I speak.

I was in first class. The outlets at my seat did not work. The plane was shabby and run down. I had prepurchsed a day subscription for internet that was not redeemable. I had to repurchase the internet for my flight and then it didn’t work anyway. Quite disappointed in what was supposed to be the launch of a great vacation.

Horrible. Both legs of my flight were delayed more than 6 hours. No compensation, no screens on the plane, and the plane was not clean.

The flight was smooth, the pilot kept us informed about delays and we arrived more of less on time

The flight was flawless and we even arrived between 20 and 25 minutes early!

Always seated jammed in rear of aircraft Admirals Club food at DFW terminal D was absolute worst food experience and I pay $600/year to eat this dried out junk

Mostly good. Flight was crowded but Airline personnel were very friendly & accommodating. It would be good to have savory snacks rather than just sweet Biscoff cookies.

It was a red eye flight, so no meals were provided, but it was fine with snacks. The seats felt cramped and almost too narrow.

Very crowded flight but what can you expect these days?? Crew was accommodating.

The seats in economy were appeared to be quite thin and lack sufficient cushioning to be comfortable. Perhaps it was my seating position but the plane seemed notably load.

The entertainment package was vast and the selections were very current. Keep updating it was great.

The seat was so hard my tailbone was aching The crew was kind of a b**** because I made a joke that I didn't care if they close the door I total c*** when she was trying to f****** act like she was mad at me because I said that The flight was bumpy. Sure you didnt have control over that.

I loved the staff on the plane. So friendly and helpful! However, there was an argument and misunderstanding by the staff and a customer at the gate, and the staff member was being unprofessional. When we arrived in Atlanta, we waited 1.5 hrs for our luggage to arrive. When I asked the airport attendant, they said Frontier had the longest wait for luggage out of any airlines, and that they could not be held responsible for the delay.

Not clean and was told I would get a great seat and it was not great at all

Flight got delayed for 5 hours no good explanation was offered ;(

When I wanted to check in 3 hours prior to boarding time, the employees mentioned “a little over an hour delay” so I waited for an hour then I went to go look for food in the terminal and most people from that flight were in the same area looking for food. Finally I decided after food to check to see if it’s anytime closer and now it’s 2 mins until boarding closes?! What are you kidding me? I didn’t receive anything via sms about boarding now nor via email or on the intercom. I luckily made it through, barely, and then there’s no room for my carry on mind you I’m in the very first row so I had to place my purse in one further row back and my carry on sections down. Not sure who pays for better seats to get your stuff placed all over the plane but that was the worst experience I’ve ever had flying with anyone.

This airline sucks. They offer low rates then charge you for everything, the app does not work well, the seats are the most uncomfortable. Maintenance issues on the flight, and you still have to sit through their credit card commercials. People are nice enough but does not make up for overall poor experience.

Cancelled flight after I arrived at airport after 75 min drive and parking. Next flight was 4 days in the future. Had to scramble and buy a much more expensive flight on another carrier.

I liked the turn-style feature at gate 209B at LAX. Very efficient process. The gate staff also made several, clearly directed announcements so I felt very informed.

The seats were awful, hard plastic covered in sheet vinyl. The airline tries to scam you into paying extra to get seat together when the flight wasn’t full. They were going to separate a family with young children but my wife who had a row to herself gave up her seat so the young mom could be with her young boys. I’m never giving this airline my money again.

It was a short flight so no food or entertainment….

Frontier had yet another flight cancellation. Have never made a complete round trip with this airline without at least one leg getting cancelled. Miserable flights - dirty, uncomfortable planes that apparently always have issues since I've had multiple delays and cancellations with them.

Everything you need to know for your flight from Ontario to Missouri

Information on your arrival and departure airports