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$81+ 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 9/25. Fares are subject to change and may not be available on all flights or dates of travel.
MCI — ONT
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
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 July 29, 2025.

Round-trip from

$215
(FlightHub)

One-way from

$81
(Trip.com)

Popular in

January

Cheapest in

September

Average price

$358
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. 9% potential increase in price ($42 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 July 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 July 29, 2025.

This FlightHub deal was found by Cheapflights users on 7/27. 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.
Wed 8/67:20 pmMCI - ONT
1 stop15h 49mFrontier
Thu 8/712:59 amONT - MCI
1 stop16h 05mFrontier
Deal found 7/27$215
This Alaska Airlines deal was found by Cheapflights users on 7/28. 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.
Wed 11/127:00 amMCI - ONT
1 stop10h 17mAlaska Airlines
Tue 11/187:20 amONT - MCI
1 stop6h 34mAlaska Airlines
Deal found 7/28$296
This American Airlines deal was found by Cheapflights users on 7/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/297:56 pmMCI - ONT
1 stop6h 11mAmerican Airlines
Mon 9/111:29 pmONT - MCI
1 stop8h 43mAmerican Airlines
Deal found 7/29$297
This Orbitz deal was found by Cheapflights users on 7/27. 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 Orbitz 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 7/27$358
This Hawaiian Airlines deal was found by Cheapflights users on 7/28. 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.
Sat 10/43:28 pmMCI - ONT
1 stop10h 35mHawaiian Airlines
Mon 10/61:31 pmONT - MCI
1 stop8h 28mHawaiian Airlines
Deal found 7/28$376
This United Airlines deal was found by Cheapflights users on 7/27. 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.
Sat 8/233:23 pmMCI - ONT
1 stop9h 07mUnited Airlines
Sat 8/301:19 pmONT - MCI
1 stop5h 23mUnited Airlines
Deal found 7/27$377
This Delta deal was found by Cheapflights users on 7/27. 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 8/205:59 pmMCI - ONT
1 stop7h 41mDelta
Sun 8/246:00 amONT - MCI
1 stop15h 00mDelta
Deal found 7/27$390
This Southwest deal was found by Cheapflights users on 7/29. 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.
Fri 8/294:55 pmMCI - ONT
2 stops7h 50mSouthwest
Mon 9/15:05 pmONT - MCI
1 stop5h 15mSouthwest
Deal found 7/29$392

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 29, 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 8/6

7:20 pm-9:09 am

1 stop15h 49m

Ontario

Thu 8/7

12:59 am-7:04 pm

1 stop16h 05m

$215

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Sat 8/30

3:37 pm-10:44 am

1 stop21h 07m

Ontario

Tue 9/2

5:49 pm-4:01 pm

1 stop20h 12m

$296

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Fri 8/29

7:56 pm-12:07 am

1 stop6h 11m

Ontario

Mon 9/1

11:29 pm-10:12 am

1 stop8h 43m

$297

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

$358

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Wed 8/20

6:40 am-12:14 pm

1 stop7h 34m

Ontario

Mon 8/25

4:50 pm-11:59 pm

1 stop5h 09m

$372

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Sat 10/4

3:28 pm-12:03 am

1 stop10h 35m

Ontario

Mon 10/6

1:31 pm-11:59 pm

1 stop8h 28m

$376

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Sat 8/23

3:23 pm-10:30 pm

1 stop9h 07m

Ontario

Sat 8/30

1:19 pm-8:42 pm

1 stop5h 23m

$377

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Fri 8/29

4:55 pm-10:45 pm

2 stops7h 50m

Ontario

Mon 9/1

5:05 pm-12:20 am

1 stop5h 15m

$392

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Thu 9/25

3:01 pm-7:54 pm

1 stop6h 53m

$81

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Wed 9/3

7:00 am-2:12 pm

1 stop9h 12m

$148

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/26

Showing 1-10 of 13 results
1
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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 July 25, 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 29, 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: 2h 10m.

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 July 29, 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

Comfort

7.8

Boarding

8.1

Overall

8.0

Entertainment

7.1

Food

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

Comfort

7.8

Boarding

8.1

Overall

8.0

Entertainment

7.1

Food

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
4,238 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Overall

8.0

Entertainment

7.1

Food

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
7,979 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Overall

8.0

Entertainment

7.1

Food

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
2,605 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Overall

8.0

Entertainment

7.1

Food

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
8,896 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Overall

8.0

Entertainment

7.1

Food

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 Frontier is currently your cheapest option to Ontario, with prices starting at $215. Additional round-trip tickets that might be worth considering are offered by Alaska Airlines and American Airlines, with the lowest prices starting at $296 and $297, respectively. You may be able to fly from Kansas City to Ontario for 43% 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 $81 on Frontier. Other airlines that offer cheap prices include Alaska Airlines from $148 and United Airlines from $189 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 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 July 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$107Average$200FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$298Average$384FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$316Average$404FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$370Average$442FlexibilityNo cancel feeOn-time69%

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