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$98+ 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 7/30. Fares are subject to change and may not be available on all flights or dates of travel.
MCI — ONT
Jul 5 — Jul 121
Sat 7/5
Sat 7/12
1 adult, Economy
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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 June 30, 2025.

Round-trip from

$204
(Alaska Airlines)

One-way from

$98
(Frontier)

Popular in

January

Cheapest in

September

Average price

$408
From Kansas City to Ontario
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One-way flight from Kansas City to Ontario
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Highest demand for flights based on searches. 10% potential increase in price ($45 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 30, 2025.

This Alaska Airlines deal was found by Cheapflights users on 6/28. 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 8/284:55 pmMCI - ONT
1 stop8h 58mAlaska Airlines
Tue 9/25:49 pmONT - MCI
1 stop20h 12mAlaska Airlines
Deal found 6/28$204
This American Airlines deal was found by Cheapflights users on 6/28. 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.
Thu 8/212:51 pmMCI - ONT
1 stop5h 26mAmerican Airlines
Mon 8/254:54 pmONT - MCI
1 stop5h 05mAmerican Airlines
Deal found 6/28$205
This Frontier deal was found by Cheapflights users on 6/29. 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 8/188:01 pmMCI - ONT
1 stop5h 49mFrontier
Sun 8/2412:59 amONT - MCI
1 stop10h 34mFrontier
Deal found 6/29$213
This Delta deal was found by Cheapflights users on 6/29. 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.
Wed 8/135:59 pmMCI - ONT
1 stop7h 41mDelta
Wed 8/209:50 amONT - MCI
1 stop5h 14mDelta
Deal found 6/29$257
This Hawaiian Airlines deal was found by Cheapflights users on 6/28. 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.
Mon 8/116:45 amMCI - ONT
1 stop8h 42mHawaiian Airlines
Mon 8/1812:00 pmONT - MCI
1 stop9h 35mHawaiian Airlines
Deal found 6/28$279
This Southwest deal was found by Cheapflights users on 6/29. 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.
Wed 11/191:45 pmMCI - ONT
1 stop7h 30mSouthwest
Mon 11/244:40 pmONT - MCI
1 stop4h 35mSouthwest
Deal found 6/29$306

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 June 30, 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

Thu 8/28

4:55 pm-11:53 pm

1 stop8h 58m

Ontario

Tue 9/2

5:49 pm-4:01 pm

1 stop20h 12m

$204

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Thu 8/21

2:51 pm-6:17 pm

1 stop5h 26m

Ontario

Mon 8/25

4:54 pm-11:59 pm

1 stop5h 05m

$205

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Mon 8/18

8:01 pm-11:50 pm

1 stop5h 49m

Ontario

Sun 8/24

12:59 am-1:33 pm

1 stop10h 34m

$213

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Wed 8/13

5:59 pm-11:40 pm

1 stop7h 41m

Ontario

Wed 8/20

9:50 am-5:04 pm

1 stop5h 14m

$257

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Mon 8/11

6:45 am-1:27 pm

1 stop8h 42m

Ontario

Mon 8/18

12:00 pm-11:35 pm

1 stop9h 35m

$279

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Wed 7/30

7:20 pm-11:50 pm

1 stop6h 30m

$98

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Tue 8/12

3:34 pm-12:15 am

1 stop10h 41m

$102

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Mon 8/4

2:32 pm-8:52 pm

1 stop8h 20m

$110

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Thu 8/14

5:45 am-12:14 pm

1 stop8h 29m

$129

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Thu 8/7

6:45 am-1:26 pm

1 stop8h 41m

$140

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/29

Showing 1-10 of 12 results
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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 June 30, 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.

How much does it cost to fly round-trip from Kansas City to Ontario?

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 June 30, 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

Crew

8.5

Entertainment

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

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

Crew

8.5

Entertainment

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

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
4,278 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

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
7,973 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

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
2,529 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

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
8,852 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

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 Alaska Airlines is currently your cheapest option to Ontario, with prices starting at $204. Additional round-trip tickets that might be worth considering are offered by American Airlines and Frontier, with the lowest prices starting at $205 and $213, respectively. You may be able to fly from Kansas City to Ontario for 45% 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 $98 on Frontier. Other airlines that offer cheap prices include Hawaiian Airlines from $102 and Delta from $129 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

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Alternative routes for Kansas City to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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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 June 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$107Average$180FlexibilityNo cancel feeOn-time62%
DeltaCheapest$248Average$376FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$298Average$374FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$315Average$442FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$316Average$403FlexibilityNo cancel feeOn-time63%

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