$88 Find Cheap Flights from Ontario to Missouri - Compare and Save

1 adult
1 adult, Economy, 0 bags

Save 26% or more on flights. Compare deals from all over the web.

Never overpay with our price tracking tools.

Filter searches by price, airline and more to find your best flights.

Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Ontario to Missouri

Cheapest round-trip prices found by our users on KAYAK in the last 5 days
Sort by: Cheapest
St. Louis
5h 38m2 stops
from $199per person
Kansas City
4h 34m2 stops
from $201per person
Columbia
5h 08m2 stops
from $368per person
Springfield
5h 21m2 stops
from $379per person
Fort Leonard Wood
Fort Leonard Wood
13h 14m4 stops
from $496per person
Joplin
10h 51m2 stops
from $557per person
Explore the map
Booking Insights

Price, demand and travel trends for Ontario to Missouri flights

Use KAYAK data on prices, travel dates, airlines and seasonal trends to compare options and book flights with more confidence.

What are the cheapest fares from Ontario to Missouri recently?

Here are the cheapest round-trip fares from Ontario to Missouri on KAYAK in the last week:

• Lambert-St Louis (STL) from $199
• Kansas City (MCI) from $201
• Columbia Regional (COU) from $368
• Springfield-Branson (SGF) from $384

How do fares into airports in Missouri compare?

According to KAYAK data from the last 12 months, the cheapest airports to fly into Missouri from Ontario are:

• Lambert-St Louis (STL) (avg. price $383)
• Kansas City (MCI) (avg. price $427)
• Columbia Regional (COU) (avg. price $438)

Are flights from Ontario to Missouri cheaper or more expensive than last year?

Fares from Ontario to Missouri are about 20% lower than they were in November last year, averaging $264 round-trip.

What's the cheapest month to fly from Ontario to Missouri?

February is typically the cheapest month to fly from Ontario to Missouri, with round-trip fares averaging $312. July and June are usually the most expensive, averaging $522 and $480, respectively.

How do fares from Ontario to Missouri vary by day of the week?

On average, Sunday is the cheapest day to fly from Ontario to Missouri and Monday is the most expensive. Looking at the past 12 months of KAYAK data, it's 28% more expensive to fly on a Monday compared to Sunday.

What's the best time of day to fly from Ontario to Missouri?

It's cheapest to fly to Missouri in the evening with average prices of $397. The afternoon is the most expensive time to fly, with average prices of $464.

What's the best time to book a flight from Ontario to Missouri?

Book your flights 19 weeks before your trip. KAYAK data collected over the past 12 months shows that booking in this window can save you around 54% compared to booking at the last minute (within 2 weeks of departure).

Key details for Ontario to Missouri flights

Low season

February

Cheapest flight

$88
Beat the crowds with an average 46% drop in travelers.
The most popular month to fly with an average 48% increase in travelers.
One-way flight from Ontario to St. Louis

Your Ontario to Missouri flight questions, answered

Find helpful answers about this route, including flight times, airports, airlines and booking tips.

  • Is now a good time to book a flight from Ontario to Missouri?

    Yes. Fares from Ontario to Missouri are low right now. As a rule of thumb, a round-trip under $328 (cheaper than most fares this year) is a good deal, so if you spot one at or below that, it's a good time to book.

  • How much should I budget for a flight from Ontario to Missouri?

    Over the past 12 months, round-trip fares from Ontario to Missouri have typically cost between $328 and $568.

  • What are the main airports serving Missouri?

    There are 11 airports in Missouri. 51% of KAYAK users choose Kansas City (MCI) as their arrival airport, while 34% choose Lambert-St Louis (STL).

  • Which airlines fly nonstop from Ontario to Missouri?

    Based on the flight schedule for the next 3 months, no airline regularly operates nonstop flights from Ontario to Missouri. One-stop options include:

    • Southwest
    • American Airlines
    • United Airlines

  • Which destinations in Missouri can I fly nonstop from Ontario?

    Based on the flight schedule for the next 3 months, there are no nonstop flights from Ontario to Missouri. The most popular destination you can reach with one stop is Kansas City.

  • Which cabin classes are available from Ontario to Missouri?

    On flights from Ontario to Missouri you can book Economy Class, Business Class or First Class.

  • What are some popular landmarks around Missouri?

    Missouri is home to many popular sights. KAYAK travelers' favorites include:

    • Busch Stadium
    • Arrowhead Stadium
    • Enterprise Center
    • Kansas City Convention Center

Your guide to booking Ontario to Missouri flights

Get tips on when to book, when to fly and what to know before your trip.
  • If you can plan ahead, the sweet spot for booking your flight is 19 weeks before your trip. KAYAK data shows fares in this window are around 54% lower than last-minute bookings (made within 2 weeks of departure). Not ready to commit? Set a Price Alert and we'll let you know when prices change.
  • Flexible with your dates? Fly in February to save some money. It's typically the cheapest month on this route, while flights in July will cost you the most.
  • Fly out on a Sunday to get the cheapest fares. Avoid Monday flights, which are about 28% more expensive.
  • If you're watching your budget, fly into Lambert-St Louis (STL) which has the lowest average airfare in the region. Just remember to budget for any onward travel by bus, car or domestic flight.
  • Start your trip in St. Louis, the most popular destination in Missouri. From there, it's easy to continue on to other popular spots such as Kansas City, Branson and Springfield.

Reviews of the 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.
8.0
SouthwestOverall score based on 4220 reviews
8.6Crew
8.0Comfort
7.0Food
8.1Boarding
7.5Entertainment
Airline reviews

My first flight from LGA to STL was not good. They didn't do service until over halfway through the flight, the internet didn't really work, and the crew all seemed like they didn't want to be there.

4.0 OkayTatyana, Nov 2026
Read more Southwest reviews

My first flight from LGA to STL was not good. They didn't do service until over halfway through the flight, the internet didn't really work, and the crew all seemed like they didn't want to be there.

When I made my reservation it would have been nice if kayak would have included my luggage. Unaware that I had to pay $45 each way. Should have asked at reservation time if luggage was being checked

Southwest has been a nightmare. Delayed flights, missed connections, systems down. Never again am I flying southwest.

Just crazy with times being pushed and pushed and pushed and gate crew at Philly super rude and unprofessional with many under stress with delays.

Great job! My family doesnt fly often but we felt safe 100%

Flight was delayed, full flight and I had to change gates. Southwest flights are always late later in the day.

Communication about the delayed flight was poor. We were told to move gates three times but that was bad information. We went from gate 128 to gate 126 and then to gate 123 and back to gate 126. Communication about the delay was bad. Ended up being 1 1/2 hour late getting home.

Two hour delay including one of them on the tarmac second year in a row we’ve had a bad experience. Sad that Southwest is no longer a bargain and has failed to keep up the customer service they were once so famous for.

I liked receiving attention from aged and well experienced flight attendants. I disliked the non-gluten-free snack but I brought my own so I was OK.

They should not let people take up more than their seat space. Need to buy another ticket if they overflow into someone else’s space. Or you should make your seats larger to accommodate larger folks.

Chairs don’t recline and the ones that do recline, barely do recline. It was most uncomfortable flight i ever been on.

We departed early and made up time in the air allowing us to arrive 30 minutes early. Capt was incredibly genuine and thanked every passenger for flying with Delta. Completely humble and professional!

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.

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

It was a great flight and the stewards and stewardess were all kind and accommodating!! The seats were comfortable and entertainment screen excellent!

737-800 in first class was pretty dumpy. Seat had an uncomfortable angle, storage under the seat was blocked so even my very modest backpack didn't fit, power outlet was flaky. Weird tiny seat pockets that couldn't hold a gallon ziploc bag, emesis bag missing, etc. etc. No in-flight service due to turbulence. Crew was excellent, boarding was smooth despite a full flight.

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

The flight was overbooked and the staff at the gate started calling for volunteers to drop out and offering incentives. That delayed the flight

There was no wifi even after my husband paid for wifi it wasn’t working. The plane looked and felt old.

Update the cabin with tv screens or at least music sources.

Waited on tarmac for approximately 15-25 minutes before taking off. When landing, the time it took to taxi to our gate was the also 15-25 minutes.

Flight was delayed “due to earlier delays of that plane”, so we were nearly three hours late.

Crew was amazing, takeoff wonderful. The bathroom was disgusting from before takeoff the odor made the flight uncomfortable as you could smell the bathroom from the center of the plane where we were sitting. Smelled like raw sewage. My daughter was throwing up as we landed due to the smell and horrible turbulence as we approached Newark.

Seat pitch is horrible especially on the 15 hour flight. Gate crew at SFO was Outstanding. The flight crew was also great.

Airport terminal was outdated, flight was on a small jet with no wifi

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. :/

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.

Short flight - no food understandable. Flight was delayed for over an hour. Overall, it was good.

We boarded and buckled and then deplaned due to no pilot. Had to wait over 3 hours for a new pilot. Not weather related, just poor management.

After lack of help in Philadelpha made us late to board our flight to akansas City, our flight to Kansas City was very good. And the flight attendants were also very good. The only thing that sucked was problems with assistance in Philadelphia caused our bags not to arrive.

As with most flights these days it was delayed by about 30 min.

American was the airline that Starlux contracted for this trip. I arrived in time to make the connecting flight on American, and then the baggage-handler debacle happened. For some reason, the first class and premium economy passengers' luggage was unloaded first. Never seen this happen before. They had handlers removing the bags from the carousel for those passengers. Meanwhile, all of the economy passengers were waiting for their bags, including me. And there were a lot of bags because it was an international flight packed full. While waiting for 45 minutes, my bag didn't show. Meanwhile, an American representative showed up asking if anyone has a connecting flight to Phoenix. Of course I spoke up, and they proceeded to try to find my bag because I had to take a bus to the actual terminal to catch my flight. Which I was not informed of before I arrived. After another 15 minutes of searching, my bag was finally found with the first-class passengers' bags because they had pulled it by mistake. So I rushed to the terminal with the American representative to catch my flight, and they informed me that I missed it and could not get another flight until the next day. Of course, after being on an international flight for 18 hours, I was in no mood to hear this. Now, to be fair, there were a few American employees who tried to help me. After hearing about the missed flight, they got a supervisor to talk to. I expressed my situation to the supervisor, and she was not helpful until I asked for compensation. She agreed to get me a hotel room for the night. So I agreed, and she disappeared into her office, and I waited. And waited. And waited. And waited. While waiting, I was asked by three different employees who knew of my situation if I had been helped. I told them I was waiting for the supervisor to get the hotel room, and they said they would check. Finally, after waiting for 75 minutes, one of the employees who had asked me if I had been helped arrived with my hotel room and arranged a ride to the hotel for me. Never saw the supervisor again. It was now 8 o'clock; I arrived at 5:45! My rebooked fight was scheduled for 6:11 this morning and I have now been informed it has been delayed until 10:00. So am I happy with American? NO I'M NOT!! ;

Ontario airport boarding was very easy to park and access, is clean and TSA took 10 minutes total. Check-in was a breeze and cruise was very nice.

Good flight, seated and had a water within 5 minutes. Crew was hospitable.

Small plane, poor meal choices for first class, bad terminal and boarding experience at LAX

The flight was on time and arrived early. The crew were friendly and helpful.

The chair cushions may need an upgrade. I have been noticing they are so worn out, thin so you’d sit in a dip 😄. Other than that, all was an enjoyable trip. Thanks AA!

VERY disappointed at the agent checking in my luggage. I know that the weight limit is 23 kg, a little over 50 pounds (50.71 pounds). Yet the agent kept repeating "50 pounds". So I said, the limit is 23 kg, and she had the audacity to say 'no, it is 22 kg!" Imagine my surprise. Was she ignorant or was she poorly trained? Not sure. The boarding process was pretty good. The speakers were loud enough so I still could hear them despite inconsiderate passengers continuing to speak while the announcements were going on. During the flight, the teenage girl sitting behind me kept pressing her feet to the back of my chair. I turned around several times, yet she did not get the hint. I did not make a fuss since I sense I had a bad streak that night with AA, so I just did the best I can to lean forward and not let that bother me.

It was wonderful upgrading to first. Plane was so cold thou. Crew was great. Wish there was a food option in first for such a long flight. Doesnt matter the time of day. Chintzy.

Did not get on the flight, they had a gate change and my app never updated me! Trying to get flight credit

The takeoff was the smoothest I've ever experienced on any airline and this is the first time I've flown on frontier so this was an extremely pleasant surprise!

A lady asked to stop the flight after the tunnel pulled away and we began to depart a flight that was already hours late. The attendance respectfully stopped the the plane and had the tunnel return. After the tunnel returned the passenger claimed to have changed her mind . The tunnel was then put in reverse and the passenger remained on the plane .. They should have sent the sick passenger off the plane like initially replaced. They existed a couple off the plane prior to that situation.. So.. all and all.. it was a long and flight.. .

We understand and comply with Frontier’s bag sizes. We’ve had some problems in past while having to await other passengers who do not understand the baggage restrictions or have not prepaid and that is usually our biggest concern (others delaying us) with flying Frontier. Flying OUT of ONT, however, has always been a great experience. I’ve also noted even on delayed Frontier flights very knowledgeable pilots who manage expectations well.

Long lines, rude staff, everything that's offered you have to pay for.

The last time I flew Frontier was in the 1960s when it was a “real” airline. We flew this time because of the price & schedule. As the saying goes, you get what you pay for.

I appreciated the upgrade to free cary-on bag and seat selection at no charge

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

This isna terribly run airlines. If you're one minute late, they will deny your ticket. Don't waste your time or money

Flight was delayed for more than 3 hours, crew at ONT airport was rude, and when we got to DFW the airplane had an issue landing, we had to be taxied to the terminal, and the luggage was hold until the next day.

More options for your flight from Ontario to Missouri

Complete your trip to Missouri with a hotel stay or car rental