MCI - ONT

$104 Find Cheap Flights from Kansas City to Ontario - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Kansas City to Ontario departing on 8/12. 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

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Everything you should know

Cheapest round-trip
$234
Typical prices: $268-$333
Frontier
Sat 9/12Wed 9/30
MCI - ONT • 1 stop
Cheapest one-way
$104
Typical prices: $115-$441
Frontier
Wed 8/12
MCI - ONT • 1 stop
Nonstop flights
Not available
There are currently no direct flights between Kansas City and Ontario. You'll need at least 1 connection.
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Top layover airports
Cheapest • Avg $311 (round-trip)
Shortest trip • 5h 00m (one-way)
Insights
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When to travel
Cheapest • 26% price drop
Most popular
Good to know
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Booking Insights
Flight Deals

Cheap Flights from Kansas City to Ontario (MCI-ONT)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Kansas City to Ontario 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 Kansas City to Ontario

Sat, Sep 12 - Wed, Sep 30
Frontier Logo
2:17 pm - 11:55 pm
MCI
-
ONT
11h 38m
1 stop
Frontier Logo
6:00 am - 1:22 pm
ONT
-
MCI
5h 22m
1 stop
$234Frontier
Sat, Aug 15 - Sat, Aug 22
Frontier Logo
1:45 pm - 11:50 pm
MCI
-
ONT
12h 05m
1 stop
Frontier Logo
6:00 am - 12:53 pm
ONT
-
MCI
4h 53m
1 stop
$243Frontier
Wed, Jul 29 - Sat, Aug 8
Frontier Logo
1:45 pm - 11:50 pm
MCI
-
ONT
12h 05m
1 stop
Frontier Logo
6:00 am - 1:00 pm
ONT
-
MCI
5h 00m
1 stop
$244Frontier
Sat, Aug 15 - Sat, Aug 22
Frontier Logo
1:45 pm - 11:50 pm
MCI
-
ONT
12h 05m
1 stop
Frontier Logo
3:40 pm - 4:02 pm
ONT
-
MCI
22h 22m
1 stop
$245Frontier
Sat, Aug 15 - Sat, Aug 22
Frontier Logo
1:45 pm - 11:50 pm
MCI
-
ONT
12h 05m
1 stop
Frontier Logo
3:40 pm - 4:02 pm
ONT
-
MCI
22h 22m
1 stop
$246Frontier
Wed, Jul 29 - Wed, Aug 5
Frontier Logo
1:45 pm - 11:50 pm
MCI
-
ONT
12h 05m
1 stop
Frontier Logo
6:00 am - 1:00 pm
ONT
-
MCI
5h 00m
1 stop
$248Frontier
Wed, Sep 16 - Tue, Sep 22
Frontier Logo
2:17 pm - 11:55 pm
MCI
-
ONT
11h 38m
1 stop
Frontier Logo
6:00 am - 1:22 pm
ONT
-
MCI
5h 22m
1 stop
$250Frontier
Mon, Aug 24 - Wed, Aug 26
Frontier Logo
4:47 pm - 9:27 pm
MCI
-
ONT
6h 40m
1 stop
Frontier Logo
3:40 pm - 4:02 pm
ONT
-
MCI
22h 22m
1 stop
$252Frontier
Thu, Jul 30 - Sun, Aug 2
Frontier Logo
4:32 pm - 8:03 am
MCI
-
ONT
17h 31m
1 stop
Frontier Logo
11:52 am - 3:47 pm
ONT
-
MCI
25h 55m
1 stop
$256Frontier
Thu, Jul 23 - Sat, Aug 1
Frontier Logo
1:45 pm - 10:04 am
MCI
-
ONT
22h 19m
1 stop
Frontier Logo
10:49 am - 1:00 pm
ONT
-
MCI
24h 11m
1 stop
$257Frontier
Booking Insights

KAYAK's insights & trends for Kansas City to Ontario flights

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

How much is a round-trip flight from Kansas City to Ontario?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Kansas City to Ontario departing in September.

What is the cheapest month to fly from Kansas City to Ontario?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Kansas City to Ontario, 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 Kansas City to Ontario is August, where tickets cost $290 (return) on average. On the other hand, the most expensive months are May and December, where the average cost of round-trip tickets is $497 and $478 respectively.

Good to know

Low seasonJanuary
Cheapest flight$104
Best time to beat the crowds but there is an average 2% increase in price.
Most popular time to fly with an average 22% increase in price.
Flight from Kansas City to Ontario

When to book flights from Kansas City to Ontario

Are your dates flexible? Find out the best times to travel from Kansas City to Ontario based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Kansas City to Ontario

  • What is the cheapest flight from Kansas City to Ontario?

    In the last 5 days, the lowest price for a flight from Kansas City to Ontario was $104 for a one-way ticket and $234 for a round-trip.

  • Do I need a passport to fly between Kansas City and Ontario?

    A passport is not required to fly from Kansas City to Ontario.

  • Which airports will I be using when flying from Kansas City to Ontario?

    Kansas City and Ontario are both served by 1 main airport. You will leave Kansas City from Kansas City and will be arriving at Ontario.

  • Which aircraft models fly most regularly from Kansas City to Ontario?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Kansas City to Ontario?

    Star Alliance, and oneworld are the airline alliances operating flights between Kansas City and Ontario, with Star Alliance being the most commonly used for this route.

  • Which is the best airline for flights from Kansas City to Ontario, Southwest or United Airlines?

    The two airlines most popular with KAYAK users for flights from Kansas City to Ontario are Southwest and United Airlines. With an average price for the route of $428 and an overall rating of 7.9, Southwest is the most popular choice. United Airlines is also a great choice for the route, with an average price of $360 and an overall rating of 7.4.

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

    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 Kansas City to Ontario.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from Kansas City 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 Kansas City to Ontario?

    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 Ontario with an airline and back to Kansas City with another airline. Booking your flights between Kansas City and ONT can sometimes prove cheaper using this method.

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

    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 Ontario from Kansas City up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 4 airlines serving from Kansas City to Ontario

 
See real verified KAYAK customer reviews for airlines flying from Kansas City to Ontario. 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 Kansas City to Ontario? 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.
7.9
SouthwestOverall score based on 4250 reviews
7.5Entertainment
7.0Food
8.6Crew
8.0Comfort
8.1Boarding
Airline reviews

It was just okay, no frills, basic transportation with no luxury. No screens on the seats, no water or drinks on a short flight. Full flight but at least it was on time.

6.0 GoodSteven, Jun 2026
LAS - ONT
Read more Southwest reviews

It was just okay, no frills, basic transportation with no luxury. No screens on the seats, no water or drinks on a short flight. Full flight but at least it was on time.

Over a 3 hour flight. The turbulence was almost imperceptible except for 2 short periods which were not bad and over quickly. The attendants claimed "Safety first" and sat looking at their phones for 3 hours with no drink or snack service. This isn't the first time with Southwest. I thinkit may be there new plan of operation. Oh, and it was June 18, Southwest's Birthday which offered free drinks. NOT.

The flight was okay. The pilots did an amazing job and kept us updated on the flight. The flight attendants were okay. They found time to be chatty with each other rather than focus on the guests. One of the attendants was a little less warm when asking about my bag I had on my lap that I was using during latter part of the mid- flight. Mind you, it was not the departure descent. I’m respectful to each and every attendant, it was the tone in her voice reminding me to place my carryon bag on the floor. I hope to have a better experience next time.

Pretty seamless, just a tad bit late in taking off and landing.

Everything a cheap airline should be at normal airline rates.

Delays delays delays. Late taking off, late landing, wait for a gate, etc.

I will be flying again Southwest Airlines. Friendly crew, comfortable and affordable.

Our flight to Oakland was great bc the plane was new but it was delayed by 15min not bad at all. Over all it was an 8/10

The flight in it self was good. The delays looking for pilots was unexpected.

This was the second leg in a row where the Wi-Fi was down so I couldn't use my electronics for entertainment. Also, I realize that Southwest planes do not come with chargers which would have been nice since my phone was low battery and the flight was over 3 hours. The snacks and drinks are in such small portions, and the snacks aren't good.

Know that the movies that you are going to be offered are the oldest be rated movies they could possibly get. They may have one or two new movies that they keep advertising but when you’re flying 15 hours, there is nothing to see past the first new movie.

This was an overnight flight, and in the morning they did know coffee service. How you can throw passengers in a San Francisco airport at 5:40 a.m. in the morning and not giving them Coffee is a crime.

Our flight was delayed several Times due to mechanical issues. Although I understand this may happen at times, it was very inconvenient and we had to book a hotel for an overnight stay. We were traveling with my 3-yo grandson and waiting at the airport from noon until 6:30pm with no reassurance that our next rescheduled flight would depart, we had to decide what’s best for him. A day later, I found out that I may be able to demand compensation if my flight is delayed more than 4 hours. I will hav to read the fine print next time.

Service was professional and quick. Premium economy seat was comfortable given the class

Like: departed and arrived on time. Unlike: Food options for purchase allways bad, 1 of 2 of the crew members not very friendly at all. Seats and leg room aweful. At this point I am thinking on switching to AA.

The staff was extremely helpful and friendly at all times! They went above and beyond to get us into an earlier flight in San Diego to make our connection in SFO possible, because our original flight did actually not make it! I did so much appreciate the UA team and how they made this possible. We also didn’t have seats together on the long flight to Singapore, but they found us seats together last moment with no additional cost! Nobody sat next to us, so that we were able to sleep! Thanks to UA for improving their service and Underpricer for booking this trip! Please be careful: 1,5 hrs for transfer in San Francisco might not be enough time in the future

Fine not above and beyond as I had a connection that was delayed due to maintenance

Airline did not explain reasons why flight was delayed two hours. Explanations were badly needed and rarely provided. Problem seemed to clearly be the airline’s fault and not the fault of the weather or airport.

Boarding was quick and efficient. My screen didn’t come on and everyone else had theirs working so a little bummer but it was a short flight!

They makes us feel confident on the flight. There was no any cancelation and they are really helpful with us.

The flight attendant was very polite and attentive. The food was good.

Flight cancelled. Twice. And no communication. No gate agent. Went past boarding time and had to go and see email from AA. Airport communication was bad

American delayed the flight for a crew rest period. The delay occurred late in the evening - the earliest i can find is 10:20 pm. With a 6 am flight anyone on the flight would have already have been asleep (unless you are insane, a vampire or on drugs) and at least for me i was already on the way to the airport at 445 am the next morning when i discovered they delayed the flight until 9 am. Given the incoming flight was in the air at 6 pm the evening before this should have been figured out a lot more timely that was there only crew to use. Just frustrating given there is no consideration for customer experience anymore in flying.

I very rarely fly American and my experience today reenforces that is the correct decision. While the staff were all very courteous, our flight was first thing in the morning so there was no reason to be delayed, yet appropriate maintenance checks weren’t completed prior to our flight so we were delayed multiple times. Not a great showing, American Airlines.

Smooth flight. From the early boarding and all were on board before departure time and arrived early in ONT. Great crew. Thank you!!!!

Amazing I love American. I’ll never fly anyone else if I can help it.

More room. International flight - by the time you put your purse and shoes under the seat in front of you, add in the pillow and blanket they give you- makes for tight fit.

Everything was great except for the wifi was junk. Crew was super friendly and helpful

Everything minus the seat, was okay. Not enough room. 15 hours in a small space was hard on my back. I'm still quite sore.

It was fine. I didn't love the food but it was at least a real attempt at serving a meal, unlike my earlier flight from Nashville to Dallas.

Our flight was canceled. I will never use Kayak nor Frontier for travel again. The entire experience was a headache.

Terrible. The canceled my entire flight when I requested a refund for a trip frontier canceled trip one way.

i was unable to check in the flight. refund requested

I think Frontier was very good at communication. Their app worked very well. Loading was great and the flight was nice and easy.

Great for the price. No wifi or entertainment, but gate agents and crew were fantastic and we boarded quickly and left on time.

The crew was mostly okay. The flight attendant who answered our questions was curt and unhelpful unfortunately. He seemed upset and I understand having off days.

Flight was cancelled and was not able to get another flight thru Frontier. Per frontier a refund was issued but I do not see a refund on my Afirm account.

The agent at check-in was strident, unwelcoming, and condescending to customers ahead of me.

Was charged 99 dollars for a bag despite agents previously telling me it would be ok. Customer service was unhelpful

I will like you ( Frontier Airlines) to fly into LAX instead of ONT because I live in LA and the subway takes me to my house in just 15 minutes

Everything you need to know for your flight from Kansas City to Ontario

Information on your arrival and departure airports