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$144+ 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 8/5. Fares are subject to change and may not be available on all flights or dates of travel.
MCI — ONT
Jun 18 — Jun 251
Wed 6/18
Wed 6/25
1 adult, Economy
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Cheapflights Tip: The best prices from Kansas City to Ontario are usually found in September or July, 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 13, 2025.

Round-trip from

$251
(Frontier)

One-way from

$144
(Alaska Airlines)

Popular in

January

Cheapest in

September

Average price

$406
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. 11% potential increase in price ($49 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 13, 2025.

This Frontier deal was found by Cheapflights users on 6/11. 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 8/118:01 pmMCI - ONT
1 stop5h 49mFrontier
Sun 8/2412:59 amONT - MCI
1 stop10h 34mFrontier
Deal found 6/11$251
This Southwest deal was found by Cheapflights users on 6/12. 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 8/203:15 pmMCI - ONT
1 stop5h 35mSouthwest
Mon 8/255:50 amONT - MCI
1 stop5h 20mSouthwest
Deal found 6/12$284
This Hawaiian Airlines deal was found by Cheapflights users on 6/12. 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.
Fri 8/86:45 amMCI - ONT
1 stop8h 41mHawaiian Airlines
Fri 8/152:21 pmONT - MCI
1 stop7h 14mHawaiian Airlines
Deal found 6/12$288
This Delta deal was found by Cheapflights users on 6/12. 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.
Tue 8/56:04 pmMCI - ONT
1 stop7h 38mDelta
Wed 8/65:09 pmONT - MCI
1 stop5h 12mDelta
Deal found 6/12$289
This American Airlines deal was found by Cheapflights users on 6/12. 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.
Sat 8/95:45 amMCI - ONT
1 stop6h 13mAmerican Airlines
Wed 8/1312:22 pmONT - MCI
2 stops8h 26mAmerican Airlines
Deal found 6/12$294
This Alaska Airlines deal was found by Cheapflights users on 6/11. 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.
Sat 12/137:00 amMCI - ONT
1 stop10h 12mAlaska Airlines
Mon 12/157:00 amONT - MCI
1 stop7h 20mAlaska Airlines
Deal found 6/11$307
This United Airlines deal was found by Cheapflights users on 6/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/46:00 amMCI - ONT
2 stops8h 13mUnited Airlines
Tue 9/95:10 amONT - MCI
2 stops8h 46mUnited Airlines
Deal found 6/12$340
This Expedia deal was found by Cheapflights users on 6/12. 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.
Wed 8/207:00 amMCI - ONT
1 stop9h 09mMultiple Airlines
Sun 8/2412:59 amONT - MCI
1 stop10h 34mMultiple Airlines
Deal found 6/12$375

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 13, 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

Mon 8/11

8:01 pm-11:50 pm

1 stop5h 49m

Ontario

Sun 8/24

12:59 am-1:33 pm

1 stop10h 34m

$251

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Wed 8/20

3:15 pm-6:50 pm

1 stop5h 35m

Ontario

Mon 8/25

5:50 am-1:10 pm

1 stop5h 20m

$284

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Fri 8/8

6:45 am-1:26 pm

1 stop8h 41m

Ontario

Fri 8/15

2:21 pm-11:35 pm

1 stop7h 14m

$288

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Tue 8/5

6:04 pm-11:42 pm

1 stop7h 38m

Ontario

Wed 8/6

5:09 pm-12:21 am

1 stop5h 12m

$289

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Sat 8/9

5:45 am-9:58 am

1 stop6h 13m

Ontario

Wed 8/13

12:22 pm-10:48 pm

2 stops8h 26m

$294

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Tue 8/5

6:45 am-2:46 pm

1 stop10h 01m

Ontario

Thu 8/7

2:21 pm-11:35 pm

1 stop7h 14m

$338

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Thu 9/4

6:00 am-12:13 pm

2 stops8h 13m

Ontario

Tue 9/9

5:10 am-3:56 pm

2 stops8h 46m

$340

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Wed 8/20

7:00 am-2:09 pm

1 stop9h 09m

Ontario

Sun 8/24

12:59 am-1:33 pm

1 stop10h 34m

$375

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Tue 8/5

6:45 am-2:46 pm

1 stop10h 01m

$144

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Sat 9/6

5:33 am-10:04 am

1 stop6h 31m

$145

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/12

Showing 1-10 of 15 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 9, 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 13, 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.

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

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 13, 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. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Food

7.1

Boarding

8.1

Entertainment

7.1

Overall

8.0

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

Comfort

7.8

Food

7.1

Boarding

8.1

Entertainment

7.1

Overall

8.0

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
4,286 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Food

7.1

Boarding

8.1

Entertainment

7.1

Overall

8.0

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
7,950 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Food

7.1

Boarding

8.1

Entertainment

7.1

Overall

8.0

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
7.9
Good
2,496 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Food

7.1

Boarding

8.1

Entertainment

7.1

Overall

8.0

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
8,791 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Food

7.1

Boarding

8.1

Entertainment

7.1

Overall

8.0

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 Frontier is currently your cheapest option to Ontario, with prices starting at $251. Additional round-trip tickets that might be worth considering are offered by Southwest and Hawaiian Airlines, with the lowest prices starting at $284 and $288, respectively. You may be able to fly from Kansas City to Ontario for 32% 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 $144 on Alaska Airlines. Other airlines that offer cheap prices include American Airlines from $145 and Frontier from $168 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 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$107Average$182FlexibilityNo cancel feeOn-time62%
DeltaCheapest$248Average$360FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$296Average$381FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$311Average$406FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$370Average$432FlexibilityNo cancel feeOn-time69%

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