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Find cheap flights from Ontario to Missouri from $51

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 5/18. 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
0 bags
Wed 5/29
Wed 6/5

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Best Missouri Flight Deals

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours

St. Louis
St. Louis1 stop$119
Springfield
Springfield1 stop$326
Columbia
Columbia1 stop$650
Joplin
Joplin1 stop$571

Good to know

Low season

January

High season

May

Cheapest flight

$51
Best time to beat the crowds with an average 7% drop in price.
Most popular time to fly with an average 2% 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 to Missouri from Ontario 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 to Missouri with an airline and back to Ontario 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 to Missouri from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top tips for finding cheap flights to Missouri

  • Morning departure is around 15% cheaper than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

Top 5 airlines serving from Ontario to Missouri

 
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.
8.2
China AirlinesOverall score based on 958 reviews
8.1entertainment
8.0comfort
8.6crew
8.3boarding
7.8food
Airline reviews

Comfort was left wanting due to such a long flight, made the wife and I wish we could upgrade the seats to Business class or First Class, but did not have that option. Food was good but had very limited options and I have a dietary restriction which was difficult for the staff to accommodate since everything provided came with cheese on it. (Cheese could potentially kill me) Did not have an option to inform the staff until we were already in the air about the restriction and was not provided another option before flight departed.

8.0 ExcellentMichell, Feb 2024TPE - LAX
Read more about China Airlines reviews

Comfort was left wanting due to such a long flight, made the wife and I wish we could upgrade the seats to Business class or First Class, but did not have that option. Food was good but had very limited options and I have a dietary restriction which was difficult for the staff to accommodate since everything provided came with cheese on it. (Cheese could potentially kill me) Did not have an option to inform the staff until we were already in the air about the restriction and was not provided another option before flight departed.

The plane was uncomfortable. I paid extra for more legroom but the seat was still uncomfortable. Other seats on the same exact row didn’t have to pay extra but still have extra legroom. I didn’t understand why I needed to pay $170 for. It was Iike China airline just wants to make money off their passengers. It was unfair.

It felt like a new plane. Decent leg room in economy, food was fine, and the plane didn’t feel super dry and uncomfortable.

Free Wi-Fi could have been better in the Airport.

Ask flight attendant for water during flight and she was a little rude get the water.

Baggage made it successfully to destination despite short layover. Appreciate that.

Staff were good and nice. There should me 3 meals instead of only 2 and snacks.

Excellent staff made the boarding process fast and easy. Friendly crews on both flights from Saigon to Taipei and Taipei to Los Angeles. Will fly China Airlines again.

For a long-haul flight, the crew did a very good job of keeping the lavatories clean and the aisles clear.

The check-in crew at SF did not put on breakable glass stickers on check-in baggages which caused my antique whisky bottle to break during transportation.

There was a loud squeaky sound the whole time we were flying.

On 2 different flights the wifi was horrible and there was no drink or snack service.

I didn’t not like that I could not select my seat and ended up with the worse seat.

The landing was bad and the hostess came two times and i was sleeping but when she served the person that nexts to me I woke up and she didn’t even asked me if I need any drink or snacks two times!!!!

Plane was late because of a mechanical malfunction and the food listed as available was not. Flight attendants seem over worked and under paid. They just done seem happy. And that can be seen in their faces.

Waited 3 hours on a plane to de-ice due to manpower issues. Waited another hour and a half once we landed because of a gate issue. Missed my connections. Created. A total of 13 hours of delay.

There was no FREE wi-fi nor entertainment screens at all.

Great, on time departure, friendly and accommodating crew, great leg room, Smith flight

Plane was turned around due to fog half way into the flight, Delta did not properly direct passengers to stay on same flight and instead failed to properly rebook on Alaska

Like most domestic flights in the US, you are basically on your own with this airline when it comes to food, so be sure to purchase meals and drinks ahead of time or expect to arrive starving and dehydrated (like I was).

Last minute gate change nearly caused us to miss our flight. Change was not announced or displayed in the main board at the old gate. Terrible communication. When we landed we had to wait 20 minutes because there was another plane at the assigned gate. Not the crew’s fault, but adding 20 minutes to a 45 minute flight sucked.

Due to one crew member not showing up to work, our flight was significantly delayed causing us to miss our connecting flight in Houston to Mississippi causing us to be delayed by more than 6 hours and missing our event all together. Very disappointing. All because ONE crew member called in sick. United did grant us a $15 meal voucher, which was a small but appreciated concession that I wasn’t able to use because I ordered my lunch and paid for it before applying the concession, and the staff said it was too late to use it. Ugh! We also had a TWO delay coming back from Mississippi, but that was on American Airlines and it was due to weather, so not their fault. Anyway, not at all impressed with United’s handling of our flight and the HUGE disappointment of missing our important family event for our 90 year old mother. All that money and all that stress and emotions for nothing. Having to wait the hour to bring an employee from LAX seemed like something that should not have happened. Why don’t you have a local back-up? Santa Ana is not a little airport in a rural area.

Crew was great and did their best to make us comfortable and captain came out at the beginning to announce why the flight was delayed, weather situation up ahead, and kept us updated throughout the flight.

United WiFi is consistently unusable (it can take 10 mins to load a single web page). If you need Wifi to do work, be prepared to lose half a day of productivity.

Awful. I got stuck next to a person carrying a dog and behind someone with a dog. People need to board these dogs downstairs. The cabin is crowded enough with your pets

Packed in like sardines, very uncomfortable. Sitting the aisle my shoulder was rammed into numerous times by rushing flight attendants. Also flight was very cold.

the head jack on my seat didn't work and the power outlet didn't work for my seat

Left 2 hours later for delayed I had to take care a kid with special need since people don’t want to move to accommodate the rest of the family. . It wasn’t bad but that made me upset that people can be that selfish.

For a 22 minute flight all you expect is for it to be safe and comfortable

Flight was on time. Staff were friendly. I paid for Economy Plus but was required to check my standard carry-on luggage due to lack of space on the aircraft. This cost me 30 minutes, unexpectedly, in waiting at the baggage claim. This experience did not meet my expectations.

The experience was great and much better than the flight going out. of course I was in first class but the service was excellent

Comfort of seats, ease of boarding. Food selection could be better

Food options were limited which is absolutely embarrassing for a Flight of this size The staff did not come around as much and I am not accustomed to such poor service from American Airlines Drinks I believe were limited to soda and water

Crew were attentive and friendly. Flight was smooth and early! I enjoyed the less crowded plane. Thank you!

We are gluten free, there were not any available complimentary gluten free options.

Flight delayed, boarding time kept changing, not good. Nee firm information given each time.

No meal on a cross country flight? SFO-MiA is pretty much the definition of a coast to coast flight. No meal provided. Sky high wi-fi rates too. Stop nickel and diming your customers.

The staff was unprofessional and didn’t communicate very well. The boarding process was very disheveled, potentially due to a power outage the previous day but there was no contingency plan to properly get passengers boarded the following day. Once boarded the aircraft stayed on the tarmac for over 45 minutes due to high winds. The communication was sporadic but an announcement was finally made an additional 30 minutes later that the flight was cancelled but we couldn’t get off the plane. Prior to deplaning one of the gate agents came on the plane and made an announcement for everyone to pickup their checked bags and take a card to rebook a new reservation because they didn’t have adequate staff. Flights were missed, passengers went to different airports and there was little to no assistance from AA.

Apart from the delay due to unforeseen circumstances. The leg from sjc to dfw was fine. It was the leg from dfw to orf that we encountered issues mainly due to the flight attendant crew not being friendly. We had two small children and we needed some assistance to warm up milk so the baby would sleep. The crew just didn’t get it and made things very difficult. One made a remark that the baby’s dirty diaper smell was a “gift” to the plane in a rude way. Normally I’d brush that off as a funny comment if the rest of the trip the attendants were helpful or understanding of the difficulty we faced. But that wasn’t the case. We were met with rudeness on the second leg. Whereas on the first leg the crew were so nice and helpful.

Flight From PHX to CVG was on time, very professional staff

There were 3 leg for the trip and each leg was delayed by 90 minutes or more. The boarding process takes forever with people waiting on the jetway even though most folks do not have carry-on. The whole process is poorly managed.

They cancelled the flight then did nothing to help us rebook. It was awful - I won’t fly with them again

The process of buying the ticket and navigating all the hidden charges that Frontier throws at you was a terrible experience. The actual airport experience and flying was fine.

The truck that was refueling the plane drove away with the hose still connected to the plane and ripped part of the plane off with it

Terrible. Seats are bad and the baggage policy is inconsistent

Better than I expected but I did pay for a seat and carry on bags ahead of time.

I hope to avoid flying with them in the future. First flight got cancelled then got stuck with a 13 hour layover in Denver. The process was long and frustrating to many people.

Flight was delayed on the runway for 40 minutes the crew did not even offer even water to passengers to compensate for the flight delayed. The flight was delayed due to aircraft mechanical issues. Worst customer service ever

The flight was delayed and I had to cancel because I would have missed my connection and there were no other flights for the next two days. They also lost my bag!!

My first time to fly Frontier and loved it! Boarding was super easy as we only had personal items. Crew was helpful and funny and the plane was clean. Pilot was also great at landing the plane smoothly.

Book cheap flights from Ontario to Missouri

Recent round-trip flight deals

5/13Mon
1 stopFrontier
12h 51mONT-STL
5/18Sat
1 stopFrontier
14h 06mSTL-ONT
$119
5/16Thu
1 stopFrontier
6h 37mONT-STL
5/21Tue
1 stopFrontier
20h 52mSTL-ONT
$124
5/28Tue
1 stopDelta
5h 10mONT-MCI
6/4Tue
1 stopDelta
7h 29mMCI-ONT
$258
5/25Sat
1 stopAmerican Airlines
8h 52mONT-MCI
6/1Sat
1 stopAmerican Airlines
5h 37mMCI-ONT
$294
5/25Sat
1 stopAmerican Airlines
8h 52mONT-MCI
6/1Sat
2 stopsAmerican Airlines
8h 37mMCI-ONT
$299
6/11Tue
1 stopDelta
5h 30mONT-MCI
6/14Fri
1 stopDelta
8h 22mMCI-ONT
$307
9/4Wed
1 stopUnited Airlines
5h 45mONT-SGF
9/7Sat
1 stopUnited Airlines
8h 16mSGF-ONT
$326
5/26Sun
1 stopUnited Airlines
5h 22mONT-MCI
6/1Sat
1 stopUnited Airlines
8h 25mMCI-ONT
$357
5/31Fri
1 stopAlaska Airlines
16h 05mONT-MCI
6/3Mon
1 stopAlaska Airlines
15h 06mMCI-ONT
$452
6/7Fri
2 stopsAlaska Airlines
27h 04mONT-STL
6/10Mon
1 stopAlaska Airlines
30h 17mSTL-ONT
$489

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Recent one-way flight deals

5/18Sat
1 stopFrontier
10h 03mONT-STL
$51
5/17Fri
1 stopFrontier
6h 26mONT-STL
$71
6/26Wed
1 stopDelta
5h 49mONT-MCI
$129
6/20Thu
1 stopAmerican Airlines
6h 23mONT-MCI
$178
6/1Sat
1 stopUnited Airlines
9h 01mONT-MCI
$188
8/21Wed
2 stopsDelta
11h 06mONT-STL
$196
5/25Sat
2 stopsAmerican Airlines
8h 06mONT-STL
$197
7/2Tue
1 stopUnited Airlines
8h 49mONT-MCI
$198
6/12Wed
2 stopsAlaska Airlines
12h 23mONT-STL
$222
5/30Thu
2 stopsAlaska Airlines
14h 49mONT-STL
$239

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Last minute flights from Ontario to Missouri

Last minute flight, train and bus deals

5/2Thu
multi-stopFrontier
9h 20mONT-STL
5/6Mon
multi-stopFrontier
12h 22mSTL-ONT
$218
5/3Fri
multi-stopFrontier
9h 19mONT-STL
5/4Sat
multi-stopFrontier
5h 55mSTL-ONT
$227
5/4Sat
multi-stopFrontier
23h 58mONT-MCI
5/7Tue
multi-stopFrontier
13h 19mMCI-ONT
$236
5/2Thu
multi-stopFrontier
6h 51mONT-STL
5/4Sat
multi-stopFrontier
12h 27mSTL-ONT
$239
5/3Fri
multi-stopAmerican Airlines
7h 31mONT-SGF
5/5Sun
multi-stopAmerican Airlines
6h 18mSGF-ONT
$373
5/3Fri
multi-stopAmerican Airlines
9h 03mONT-SGF
5/5Sun
multi-stopAmerican Airlines
5h 30mSGF-ONT
$378
5/1Wed
multi-stopUnited Airlines
5h 34mONT-SGF
5/3Fri
multi-stopUnited Airlines
5h 53mSGF-ONT
$598
5/4Sat
multi-stopUnited Airlines
16h 02mONT-MCI
5/8Wed
multi-stopUnited Airlines
8h 35mMCI-ONT
$606
5/3Fri
multi-stopAlaska Airlines
10h 39mONT-STL
5/4Sat
multi-stopAlaska Airlines
8h 53mSTL-ONT
$1,025
5/2Thu
multi-stopAlaska Airlines
11h 30mONT-MCI
5/5Sun
multi-stopAlaska Airlines
10h 48mMCI-ONT
$1,047

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Ontario - Missouri Flights

Departure:

Ontario (ONT)United States

Return flight deals:

Missouri - Ontario

Cabin classes: