HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$75+ Cheap flights from Kansas City to Ontario (MCI - ONT)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/30. Fares are subject to change and may not be available on all flights or dates of travel.
MCI — ONT
Aug 19 — Aug 261
Tue 8/19
Tue 8/26
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Kansas City to Ontario with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Kansas City to Ontario are usually found in September or October, booked 23 days in advance, depart on a Wednesday or Thursday and return on a Friday

Cheap flight deals from Kansas City to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Kansas City (MCI) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated August 14, 2025.

Round-trip from

$144
(Priceline)

One-way from

$75
(Cheapflightsfares)

Popular in

January

Cheapest in

September

Average price

$368
From Kansas City to Ontario
Search Deals
One-way flight from Kansas City to Ontario
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($35 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2025
Search Deals

Find flight deals from Kansas City to Ontario

Cheapest flights from Kansas City to Ontario
Explore the most affordable flight options available from Kansas City to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2025.

This Priceline deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/18:28 pmMCI - ONT
1 stop5h 22mFrontier
Thu 11/612:05 pmONT - MCI
1 stop5h 28mFrontier
Deal found 8/14$144
This FlightHub deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/318:28 pmMCI - ONT
1 stop5h 22mFrontier
Thu 11/612:05 pmONT - MCI
1 stop5h 28mFrontier
Deal found 8/14$160
This FlightHub deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/123:01 pmMCI - ONT
1 stop6h 53mFrontier
Sun 9/148:59 pmONT - MCI
1 stop14h 49mFrontier
Deal found 8/14$165
This Frontier deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/53:01 pmMCI - ONT
1 stop6h 53mFrontier
Sun 9/710:28 pmONT - MCI
2 stops13h 20mFrontier
Deal found 8/14$186
This Frontier deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/263:01 pmMCI - ONT
1 stop6h 53mFrontier
Sun 10/57:15 pmONT - MCI
2 stops19h 05mFrontier
Deal found 8/14$191
This FlightHub deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/113:01 pmMCI - ONT
1 stop6h 53mFrontier
Thu 9/183:43 pmONT - MCI
1 stop20h 05mFrontier
Deal found 8/14$193
This Expedia deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/212:18 pmMCI - ONT
1 stop11h 32mFrontier
Sun 8/2412:59 amONT - MCI
1 stop10h 34mFrontier
Deal found 8/14$194
This FlightHub deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/226:02 pmMCI - ONT
1 stop7h 48mFrontier
Sun 8/2412:59 amONT - MCI
1 stop10h 34mFrontier
Deal found 8/14$197
This FlightHub deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/138:28 pmMCI - ONT
1 stop5h 22mFrontier
Mon 11/176:53 amONT - MCI
1 stop10h 40mFrontier
Deal found 8/14$208
This Frontier deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/153:01 pmMCI - ONT
1 stop6h 53mFrontier
Sun 9/2110:28 pmONT - MCI
2 stops13h 20mFrontier
Deal found 8/14$210

Cheapflights Fare Finder

 
Customize your flight search to find flights from Kansas City to Ontario 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, Cheapflights users made 2,558,603 searches. Data last updated August 14, 2025.
Use the filters below to find and compare flights from Kansas City to Ontario that are best for you.

Fly from

Kansas City

Fly to

Ontario

Route

Depart

Return

Price

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Sat 11/1

8:28 pm-11:50 pm

1 stop5h 22m

Ontario

Thu 11/6

12:05 pm-7:33 pm

1 stop5h 28m

$144

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Fri 10/31

8:28 pm-11:50 pm

1 stop5h 22m

Ontario

Thu 11/6

12:05 pm-7:33 pm

1 stop5h 28m

$160

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Fri 9/12

3:01 pm-7:54 pm

1 stop6h 53m

Ontario

Sun 9/14

8:59 pm-1:48 pm

1 stop14h 49m

$165

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Wed 10/15

7:02 pm-11:50 pm

1 stop6h 48m

Ontario

Wed 10/22

6:53 am-5:55 pm

1 stop9h 02m

$170

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Fri 9/5

3:01 pm-7:54 pm

1 stop6h 53m

Ontario

Sun 9/7

10:28 pm-1:48 pm

2 stops13h 20m

$186

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Fri 10/31

8:28 pm-11:50 pm

1 stop5h 22m

Ontario

Fri 11/7

10:40 pm-7:33 pm

2 stops18h 53m

$189

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Sat 11/1

8:28 pm-11:50 pm

1 stop5h 22m

Ontario

Fri 11/7

10:40 pm-7:33 pm

2 stops18h 53m

$189

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Wed 10/8

7:02 pm-11:50 pm

1 stop6h 48m

Ontario

Sun 10/12

10:40 pm-7:53 pm

2 stops19h 13m

$189

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Fri 9/26

3:01 pm-7:54 pm

1 stop6h 53m

Ontario

Sun 10/5

7:15 pm-4:20 pm

2 stops19h 05m

$191

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Thu 10/30

8:28 pm-11:50 pm

1 stop5h 22m

$75

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/14

Showing 1-10 of 21 results
1
2
3

Best time to book a flight from Kansas City to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Kansas City with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

How far ahead should I book a flight from Kansas City to Ontario?

Use this chart to determine the optimal time to book a round-trip flight from Kansas City to Ontario. Price data was last updated on August 8, 2025.

The price you pay for your flight from Kansas City to Ontario may vary depending on when you book. For the best chance of a lower fare, look to book 23 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Kansas City to Ontario?

Currently, August is the cheapest month in which you can book a flight from Kansas City to Ontario (average of $246). Flying from Kansas City to Ontario in March is currently the most expensive (average of $328). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from MCI to ONT?

Find hourly flight availability from Kansas City to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 14, 2025.

A simple way to save on the total cost of your ticket is to fly from Kansas City to Ontario in the evening. If you’re flexible enough to do this you can expect to save up to 53% on your trip compared to booking a flight in the morning.

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

Use this chart to determine the cheapest time to fly round-trip from Kansas City to Ontario. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Kansas City to Ontario flight should consider departing on Wednesday evenings when fares are most often at their lowest. Tuesday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

What’s the top layover airport for flights from Kansas City to Ontario?

Share of 1-stop round-trip flights from Kansas City to Ontario chosen by Cheapflights users in the past 12 months, using the same layover each way.

Denver (DEN) – chosen by Cheapflights users on 83% of 1-stop itineraries from Kansas City to Ontario on Cheapflights.

What’s the cheapest layover airport for flights from Kansas City to Ontario?

Average round-trip fare for 1-stop flights from Kansas City to Ontario, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Denver (DEN) is the most affordable 1-stop option, with an average round-trip price of $304.

What’s the fastest layover option from Kansas City to Ontario?

Shortest average travel time for 1-stop one-way flights from Kansas City to Ontario, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Phoenix (PHX) have the shortest average one-way travel time for 1-stop routes: 4h 55m.

Which airport typically offers the quickest layover for flights from Kansas City to Ontario?

Average layover duration for 1-stop one-way flights from Kansas City to Ontario, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Phoenix (PHX) offer the fastest connection on this route, with an average layover time of 1h 03m.

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated August 14, 2025.
Peruse reviews from past customers who have flown with Southwest, United Airlines, and American Airlines from Kansas City to Ontario to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,244 reviews

Entertainment

7.5

Food

7.0

Boarding

8.1

Overall

8.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,244 reviews
Southwest
8.0
Very good
4,244 reviews

Entertainment

7.5

Food

7.0

Boarding

8.1

Overall

8.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
8,916 reviews
Southwest
8.0
Very good
4,244 reviews

Entertainment

7.5

Food

7.0

Boarding

8.1

Overall

8.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,244 reviews

Entertainment

7.5

Food

7.0

Boarding

8.1

Overall

8.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Frontier
5.8
Fair
3,219 reviews
Southwest
8.0
Very good
4,244 reviews

Entertainment

7.5

Food

7.0

Boarding

8.1

Overall

8.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Related info for your journey

Find useful and relevant information for your journey from Kansas City to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines flying from Kansas City to Ontario round-trip?

    Flying on Frontier is currently your cheapest option to Ontario, with prices starting at $107. Additional round-trip tickets that might be worth considering are offered by American Airlines and Southwest, with the lowest prices starting at $284 and $316, respectively. You may be able to fly from Kansas City to Ontario for 72% less than the average price by searching for these airlines.

  • Can I find deals for flights from Kansas City to Ontario that include hotel bookings?

    Yes. In addition to deals on Kansas City to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Kansas City to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Kansas City to Ontario.

  • Can I find deals for business class flights from Kansas City to Ontario?

    Yes. Cheapflights offers flight deals from Kansas City to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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

    Currently, August is the cheapest month in which you can book a flight from Kansas City to Ontario (average of $246). Flying from Kansas City to Ontario in March is currently the most expensive (average of $328). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Kansas City to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
St. Louis to Las Vegas flights
Kansas City to Las Vegas flights
Kansas City to San Diego flights
St. Louis to Los Angeles flights
Kansas City to Los Angeles flights
Kansas City to San Francisco flights
St. Louis to San Francisco flights
St. Louis to San Diego flights
Kansas City to Burbank flights
Kansas City to Santa Ana flights
St. Louis to Reno flights
St. Louis to Ontario flights
St. Louis to Sacramento flights
Kansas City to Long Beach flights
Kansas City to Sacramento flights
St. Louis to San Jose flights
Kansas City to San Jose flights
Kansas City to Oakland flights
Springfield to Los Angeles flights
St. Louis to Santa Ana flights
Springfield to Las Vegas flights
St. Louis to Palm Springs flights
Springfield to Sacramento flights
Kansas City to Palm Springs flights
Springfield to San Francisco flights
St. Louis to Fresno flights
Kansas City to Reno flights
St. Louis to Long Beach flights
Springfield to Ontario flights
Springfield to Santa Ana flights
St. Louis to Burbank flights
Springfield to San Diego flights
Kansas City to Santa Barbara flights
Columbia to Santa Ana flights
Columbia to Los Angeles flights
Columbia to Las Vegas flights
St. Louis to Monterey flights
Springfield to San Jose flights
Kansas City to Fresno flights
Springfield to Burbank flights
Kansas City to San Luis Obispo flights
Columbia to Burbank flights
Springfield to Fresno flights
Kansas City to Medford flights
St. Louis to Oakland flights
Springfield to Reno flights
Kansas City to Santa Rosa flights
Columbia to Ontario flights
St. Louis to Yuma flights

Top 4 airlines flying from Kansas City to Ontario

Discover the top 4 airlines that operate flights from Kansas City to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$107Average$218FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$284Average$384FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$316Average$405FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$370Average$442FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.