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$138+ 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 4/5. Fares are subject to change and may not be available on all flights or dates of travel.
MCI — ONT
Mar 31 — Apr 71
Mon 3/31
Mon 4/7
1 adult, Economy
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Cheapflights Tip: The best prices from Kansas City to Ontario are usually found in September or May, 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 March 26, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$278
(Frontier)

One-way from

$138
(Cheapflightsfares)

Popular in

January

Cheapest in

September

Average price

$391
Provider with most accurate pricing for Kansas City-Ontario flight deals.
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Provider most trusted by Cheapflights users for Kansas City-Ontario flights.
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From Kansas City to Ontario
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One-way flight from Kansas City to Ontario
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($68 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($12 potential savings vs. average RT price).
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Average for round-trip flights in March 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 March 26, 2025.

This Frontier deal was found by Cheapflights users on 3/25. 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 4/268:40 pmMCI - ONT
1 stop5h 19mFrontier
Mon 5/512:16 pmONT - MCI
1 stop5h 35mFrontier
Deal found 3/25$278
This Delta deal was found by Cheapflights users on 3/25. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/297:00 amMCI - ONT
1 stop7h 16mDelta
Thu 5/810:01 amONT - MCI
1 stop5h 08mDelta
Deal found 3/25$335
This American Airlines deal was found by Cheapflights users on 3/26. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/85:15 amMCI - ONT
2 stops8h 35mAmerican Airlines
Tue 5/1312:45 pmONT - MCI
1 stop8h 06mAmerican Airlines
Deal found 3/26$340
This United Airlines deal was found by Cheapflights users on 3/25. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/96:00 amMCI - ONT
2 stops10h 50mUnited Airlines
Tue 4/151:20 pmONT - MCI
2 stops8h 24mUnited Airlines
Deal found 3/25$345
This Alaska Airlines deal was found by Cheapflights users on 3/25. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/292:59 pmMCI - ONT
1 stop7h 30mAlaska Airlines
Tue 5/611:46 amONT - MCI
1 stop10h 13mAlaska Airlines
Deal found 3/25$355
This Southwest deal was found by Cheapflights users on 3/25. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/306:05 amMCI - ONT
2 stops6h 55mSouthwest
Mon 6/24:55 pmONT - MCI
1 stop5h 35mSouthwest
Deal found 3/25$376
This Expedia deal was found by Cheapflights users on 3/26. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/48:35 pmMCI - ONT
1 stop5h 24mMultiple Airlines
Tue 4/810:18 amONT - MCI
1 stop6h 30mMultiple Airlines
Deal found 3/26$423

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 March 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

Sat 4/26

8:40 pm-11:59 pm

1 stop5h 19m

Ontario

Fri 5/9

12:16 pm-7:51 pm

1 stop5h 35m

$278

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Tue 4/29

7:00 am-12:16 pm

1 stop7h 16m

Ontario

Thu 5/8

10:01 am-5:09 pm

1 stop5h 08m

$335

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Thu 5/8

5:15 am-11:50 am

2 stops8h 35m

Ontario

Tue 5/13

12:45 pm-10:51 pm

1 stop8h 06m

$340

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Wed 4/9

6:00 am-2:50 pm

2 stops10h 50m

Ontario

Tue 4/15

1:20 pm-11:44 pm

2 stops8h 24m

$345

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Tue 4/29

2:59 pm-8:29 pm

1 stop7h 30m

Ontario

Tue 5/6

11:46 am-11:59 pm

1 stop10h 13m

$355

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Fri 5/30

6:05 am-11:00 am

2 stops6h 55m

Ontario

Mon 6/2

4:55 pm-12:30 am

1 stop5h 35m

$376

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Thu 5/1

6:00 am-12:24 pm

2 stops8h 24m

Ontario

Wed 5/7

11:46 am-11:59 pm

1 stop10h 13m

$601

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Sat 4/5

8:37 pm-11:59 pm

1 stop5h 22m

$138

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Sun 8/31

4:55 pm-11:59 pm

1 stop9h 04m

$168

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Sat 6/7

10:41 am-6:12 pm

2 stops9h 31m

$173

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/26

Showing 1-10 of 14 results
1
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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 March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
MytripPrice Accuracy3 starsTrust Score*3 stars
FlightnetworkPrice Accuracy2 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*3 stars

*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 March 21, 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 $326). 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 March 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 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 March 26, 2025.
Peruse reviews from past customers who have flown with Southwest, Alaska Airlines 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.
Southwest
8.1
Very good
4,273 reviews

Crew

8.6

Boarding

8.2

Food

7.1

Comfort

8.1

Entertainment

7.6

Overall

8.1

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Southwest
8.1
Very good
4,273 reviews
Southwest
8.1
Very good
4,273 reviews

Crew

8.6

Boarding

8.2

Food

7.1

Comfort

8.1

Entertainment

7.6

Overall

8.1

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Alaska Airlines
8.0
Very good
9,792 reviews
Southwest
8.1
Very good
4,273 reviews

Crew

8.6

Boarding

8.2

Food

7.1

Comfort

8.1

Entertainment

7.6

Overall

8.1

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Delta
8.0
Very good
7,891 reviews
Southwest
8.1
Very good
4,273 reviews

Crew

8.6

Boarding

8.2

Food

7.1

Comfort

8.1

Entertainment

7.6

Overall

8.1

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Hawaiian Airlines
7.9
Good
2,334 reviews
Southwest
8.1
Very good
4,273 reviews

Crew

8.6

Boarding

8.2

Food

7.1

Comfort

8.1

Entertainment

7.6

Overall

8.1

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
United Airlines
7.4
Good
8,608 reviews
Southwest
8.1
Very good
4,273 reviews

Crew

8.6

Boarding

8.2

Food

7.1

Comfort

8.1

Entertainment

7.6

Overall

8.1

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

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 $278. Additional round-trip tickets that might be worth considering are offered by Delta and American Airlines, with the lowest prices starting at $335 and $340, respectively. You may be able to fly from Kansas City to Ontario for 20% 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 $138 on Frontier. Other airlines that offer cheap prices include Alaska Airlines from $168 and American Airlines from $173 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 $326). 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 6 airlines flying from Kansas City to Ontario

Discover the top 6 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 March 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$98Average$170FlexibilityNo cancel feeOn-time65%
FrontierCheapest$114Average$182FlexibilityNo cancel feeOn-time62%
DeltaCheapest$248Average$376FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$276Average$385FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$315Average$442FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$326Average$414FlexibilityNo cancel feeOn-time63%
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