HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$95+ 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 9/29. Fares are subject to change and may not be available on all flights or dates of travel.
MCI — ONT
Jul 16 — Jul 231
Wed 7/16
Wed 7/23
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 July 11, 2025.

Round-trip from

$159
(American Airlines)

One-way from

$95
(flugladen.de)

Popular in

January

Cheapest in

September

Average price

$356
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 ($45 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 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 July 11, 2025.

This American Airlines deal was found by Cheapflights users on 7/7. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/57:00 amMCI - ONT
1 stop6h 56mAmerican Airlines
Tue 8/122:57 pmONT - MCI
1 stop5h 51mAmerican Airlines
Deal found 7/7$159
This Southwest deal was found by Cheapflights users on 7/8. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/1610:25 amMCI - ONT
2 stops8h 55mSouthwest
Mon 8/182:15 pmONT - MCI
2 stops6h 25mSouthwest
Deal found 7/8$169
This Hawaiian Airlines deal was found by Cheapflights users on 7/10. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/254:55 pmMCI - ONT
1 stop8h 59mHawaiian Airlines
Sat 9/277:10 amONT - MCI
1 stop6h 51mHawaiian Airlines
Deal found 7/10$202
This Alaska Airlines deal was found by Cheapflights users on 7/9. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/184:55 pmMCI - ONT
1 stop8h 59mAlaska Airlines
Wed 9/2411:39 amONT - MCI
1 stop7h 33mAlaska Airlines
Deal found 7/9$203
This Booking.com deal was found by Cheapflights users on 7/10. 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 8/67:20 pmMCI - ONT
1 stop15h 49mFrontier
Tue 8/1212:59 amONT - MCI
1 stop15h 24mFrontier
Deal found 7/10$231
This Delta deal was found by Cheapflights users on 7/8. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/175:45 amMCI - ONT
1 stop5h 10mDelta
Thu 8/219:50 amONT - MCI
1 stop5h 14mDelta
Deal found 7/8$257

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 July 11, 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

Tue 8/5

7:00 am-11:56 am

1 stop6h 56m

Ontario

Tue 8/12

2:57 pm-10:48 pm

1 stop5h 51m

$159

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Sat 8/16

10:25 am-5:20 pm

2 stops8h 55m

Ontario

Mon 8/18

2:15 pm-10:40 pm

2 stops6h 25m

$169

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Thu 9/25

3:37 pm-12:03 am

1 stop10h 26m

Ontario

Mon 9/29

7:10 am-4:01 pm

1 stop6h 51m

$202

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Thu 9/18

4:55 pm-11:54 pm

1 stop8h 59m

Ontario

Wed 9/24

11:39 am-9:12 pm

1 stop7h 33m

$203

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Wed 8/6

7:20 pm-9:09 am

1 stop15h 49m

Ontario

Tue 8/12

12:59 am-6:23 pm

1 stop15h 24m

$231

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Sun 8/17

5:45 am-8:55 am

1 stop5h 10m

Ontario

Thu 8/21

9:50 am-5:04 pm

1 stop5h 14m

$257

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Mon 9/29

4:55 pm-11:54 pm

1 stop8h 59m

$95

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Fri 8/8

2:32 pm-8:52 pm

1 stop8h 20m

$120

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Fri 8/15

8:01 pm-11:50 pm

1 stop5h 49m

$121

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Tue 10/7

3:28 pm-12:03 am

1 stop10h 35m

$134

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/10

Showing 1-10 of 14 results
1
2

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 June 27, 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 July 11, 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.

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 July 11, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Southwest, and Delta 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.
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,250 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,951 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.8
Good
2,561 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,846 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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 American Airlines is currently your cheapest option to Ontario, with prices starting at $159. Additional round-trip tickets that might be worth considering are offered by Southwest and Hawaiian Airlines, with the lowest prices starting at $169 and $202, respectively. You may be able to fly from Kansas City to Ontario for 57% less than the average price by searching for these airlines.

  • What are the cheapest airlines to fly from Kansas City to Ontario one-way?

    One-way options have recently been found by users for as low as $95 on Alaska Airlines. Other airlines that offer cheap prices include Frontier from $121 and Hawaiian Airlines from $134 one-way.

  • 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 Los Angeles flights
Kansas City to Las Vegas flights
Kansas City to San Francisco flights
Kansas City to San Diego flights
St. Louis to Los Angeles flights
St. Louis to San Francisco flights
St. Louis to San Diego flights
St. Louis to Ontario flights
Kansas City to Santa Ana flights
Kansas City to Oakland flights
St. Louis to Sacramento flights
St. Louis to Santa Ana flights
Kansas City to Sacramento flights
Kansas City to San Jose flights
Kansas City to Burbank flights
Springfield to San Diego flights
St. Louis to San Jose flights
St. Louis to Long Beach flights
Springfield to Las Vegas flights
Kansas City to Reno flights
Springfield to Los Angeles flights
St. Louis to Fresno flights
St. Louis to Reno flights
St. Louis to Santa Barbara flights
St. Louis to Palm Springs flights
Springfield to Ontario flights
St. Louis to Burbank flights
Kansas City to Long Beach flights
Springfield to Sacramento flights
Springfield to Santa Ana flights
Kansas City to Palm Springs flights
St. Louis to Oakland flights
Columbia to San Francisco flights
St. Louis to Monterey flights
Springfield to Reno flights
Kansas City to Fresno flights
Springfield to San Francisco flights
Kansas City to Monterey flights
Columbia to Los Angeles flights
Springfield to Burbank flights
Springfield to Bakersfield flights
Joplin to San Diego flights
Columbia to Las Vegas flights
Joplin to San Francisco flights
Kansas City to Medford flights
Kansas City to San Luis Obispo flights
Joplin to Las Vegas flights
Kansas City to Santa Rosa flights

Top 5 airlines flying from Kansas City to Ontario

Discover the top 5 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 July 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$107Average$180FlexibilityNo cancel feeOn-time62%
DeltaCheapest$248Average$360FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$298Average$374FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$315Average$442FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$316Average$404FlexibilityNo cancel feeOn-time63%

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.