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$67+ 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 1/9. Fares are subject to change and may not be available on all flights or dates of travel.
MCI — ONT
Nov 25 — Dec 21
Tue 11/25
Tue 12/2
1 adult, Economy
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Cheapflights Tip: The best prices from Kansas City to Ontario are usually found in September or August, 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 October 26, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$130
(Frontier)

One-way from

$67
(Trip.com)

Popular in

January

Cheapest in

September

Average price

$346
Provider with most accurate pricing for Kansas City-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for Kansas City-Ontario flights.
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From Kansas City to Ontario
Search Deals
One-way flight from Kansas City to Ontario
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($43 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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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 October 26, 2025.

This Frontier deal was found by Cheapflights users on 10/25. 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.
Sat 11/88:28 pmMCI - ONT
1 stop5h 22mFrontier
Thu 11/1312:05 pmONT - MCI
1 stop5h 33mFrontier
Deal found 10/25$130
This Frontier deal was found by Cheapflights users on 10/25. 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.
Sat 11/88:28 pmMCI - ONT
1 stop5h 22mFrontier
Tue 11/118:45 amONT - MCI
1 stop6h 34mFrontier
Deal found 10/25$150
This Frontier deal was found by Cheapflights users on 10/25. 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.
Sat 11/18:28 pmMCI - ONT
1 stop5h 22mFrontier
Sat 11/86:53 amONT - MCI
1 stop10h 40mFrontier
Deal found 10/25$162
This Kiwi.com deal was found by Cheapflights users on 10/23. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/166:30 amMCI - ONT
1 stop16h 47mMultiple Airlines
Wed 12/246:45 amONT - MCI
1 stop11h 05mMultiple Airlines
Deal found 10/23$167
This Frontier deal was found by Cheapflights users on 10/24. 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.
Sat 11/88:28 pmMCI - ONT
1 stop5h 22mFrontier
Wed 11/128:45 amONT - MCI
1 stop6h 34mFrontier
Deal found 10/24$170
This Frontier deal was found by Cheapflights users on 10/26. 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.
Thu 11/138:28 pmMCI - ONT
1 stop5h 22mFrontier
Sat 11/1512:05 pmONT - MCI
1 stop5h 28mFrontier
Deal found 10/26$176
This Booking.com deal was found by Cheapflights users on 10/25. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/56:49 pmMCI - ONT
1 stop18h 21mFrontier
Wed 11/128:45 amONT - MCI
1 stop6h 34mFrontier
Deal found 10/25$178
This Frontier deal was found by Cheapflights users on 10/24. 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.
Thu 11/138:28 pmMCI - ONT
1 stop5h 22mFrontier
Sun 11/166:53 amONT - MCI
1 stop10h 40mFrontier
Deal found 10/24$182
This Booking.com deal was found by Cheapflights users on 10/25. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/78:28 pmMCI - ONT
1 stop16h 42mFrontier
Mon 11/104:05 pmONT - MCI
1 stop23h 14mFrontier
Deal found 10/25$184
This Frontier deal was found by Cheapflights users on 10/24. 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 11/78:28 pmMCI - ONT
1 stop5h 22mFrontier
Wed 11/128:45 amONT - MCI
1 stop6h 34mFrontier
Deal found 10/24$202
This Frontier deal was found by Cheapflights users on 10/26. 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 11/108:28 pmMCI - ONT
1 stop5h 22mFrontier
Sat 11/1512:05 pmONT - MCI
1 stop5h 28mFrontier
Deal found 10/26$206
This Frontier deal was found by Cheapflights users on 10/25. 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.
Sat 11/18:28 pmMCI - ONT
1 stop5h 22mFrontier
Wed 11/58:45 amONT - MCI
1 stop6h 34mFrontier
Deal found 10/25$208

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 October 26, 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

Wed 11/12

6:49 pm-11:10 am

1 stop18h 21m

Ontario

Tue 11/18

8:45 am-5:19 pm

1 stop6h 34m

$170

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Fri 11/7

8:28 pm-11:10 am

1 stop16h 42m

Ontario

Mon 11/10

4:05 pm-5:19 pm

1 stop23h 14m

$184

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Fri 11/7

8:28 pm-11:10 am

1 stop16h 42m

Ontario

Tue 11/11

8:45 am-5:19 pm

1 stop6h 34m

$184

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Sat 11/15

8:28 pm-11:50 pm

1 stop5h 22m

Ontario

Mon 11/17

6:53 am-7:33 pm

1 stop10h 40m

$226

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Mon 11/10

8:28 pm-11:50 pm

1 stop5h 22m

Ontario

Sat 11/15

12:05 pm-7:33 pm

1 stop5h 28m

$226

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Thu 10/30

8:28 pm-11:50 pm

1 stop5h 22m

Ontario

Sat 11/1

6:53 am-7:38 pm

1 stop10h 45m

$258

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Mon 11/3

8:28 pm-11:50 pm

1 stop5h 22m

Ontario

Tue 11/4

8:45 am-5:19 pm

1 stop6h 34m

$261

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Sat 11/1

8:28 pm-11:50 pm

1 stop5h 22m

Ontario

Sun 11/2

5:53 am-6:33 pm

1 stop10h 40m

$264

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Thu 11/13

8:28 pm-11:50 pm

1 stop5h 22m

Ontario

Mon 11/17

6:53 am-7:33 pm

1 stop10h 40m

$272

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Tue 12/16

10:30 am-5:20 pm

2 stops8h 50m

Ontario

Wed 12/24

12:45 pm-10:00 pm

2 stops7h 15m

$278

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/23

Showing 1-10 of 21 results
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2
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Compare providers for flights from Kansas City to Ontario

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Kansas City to Ontario in October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Kansas City-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Kansas City-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Kansas City-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Kansas City-Ontario flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Kansas City-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 October 24, 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 $79). Flying from Kansas City to Ontario in March is currently the most expensive (average of $150). 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 October 26, 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 52% 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. Saturday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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 October 26, 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
4,235 reviews

Crew

8.6

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Food

7.0

Overall

8.0

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
4,235 reviews
Southwest
8.0
Very good
4,235 reviews

Crew

8.6

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Food

7.0

Overall

8.0

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
8,999 reviews
Southwest
8.0
Very good
4,235 reviews

Crew

8.6

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Food

7.0

Overall

8.0

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
11,036 reviews
Southwest
8.0
Very good
4,235 reviews

Crew

8.6

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Food

7.0

Overall

8.0

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
3,123 reviews
Southwest
8.0
Very good
4,235 reviews

Crew

8.6

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Food

7.0

Overall

8.0

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.

  • How long is the flight from Kansas City to Ontario?

    Airlines like Frontier fly from Kansas City to Ontario in about 18h 21m. The time it takes to get you to your destination can typically vary by up to . The distance from Kansas City to Ontario is about 1314 mi.

  • 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 $142. Additional round-trip tickets that might be worth considering are offered by United Airlines and American Airlines, with the lowest prices starting at $284 and $284, respectively. You may be able to fly from Kansas City to Ontario for 62% 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 $79). Flying from Kansas City to Ontario in March is currently the most expensive (average of $150). 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

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See prices for flight routes from nearby airports that may be better suited for you.
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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 October 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$138Average$236FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$284Average$421FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$290Average$402FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$298Average$385FlexibilityNo cancel feeOn-time71%

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