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Ontario

$196+ Cheap flights from Killeen to Ontario (GRK - 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 8/15. Fares are subject to change and may not be available on all flights or dates of travel.
GRK — ONT
Apr 19 — Apr 261
Sun 4/19
Sun 4/26
1 adult, Economy
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Cheap flight deals from Killeen to Ontario

Cheapest flights from Killeen to Ontario
Explore the most affordable flight options available from Killeen to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 20, 2026.

This American Airlines deal was found by Cheapflights users on 3/16. 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 9/53:06 pm
GRK
-
ONT
1 stop5h 51m
American Airlines
Sat 9/1210:25 am
ONT
-
GRK
1 stop6h 29m
American Airlines
Deal found 3/16$365
This American Airlines deal was found by Cheapflights users on 3/18. 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 4/107:09 pm
GRK
-
ONT
1 stop5h 27m
American Airlines
Sun 4/1211:59 pm
ONT
-
GRK
1 stop7h 36m
American Airlines
Deal found 3/18$507
This American Airlines deal was found by Cheapflights users on 3/18. 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 4/26:33 pm
GRK
-
ONT
1 stop7h 26m
American Airlines
Mon 4/611:58 pm
ONT
-
GRK
1 stop7h 37m
American Airlines
Deal found 3/18$571
This American Airlines deal was found by Cheapflights users on 3/15. 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 11/76:05 am
GRK
-
ONT
1 stop5h 52m
American Airlines
Tue 11/2412:46 pm
ONT
-
GRK
1 stop6h 21m
American Airlines
Deal found 3/15$583
This American Airlines deal was found by Cheapflights users on 3/15. 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 11/66:05 am
GRK
-
ONT
1 stop5h 52m
American Airlines
Tue 11/2412:46 pm
ONT
-
GRK
1 stop6h 21m
American Airlines
Deal found 3/15$585
This American Airlines deal was found by Cheapflights users on 3/15. 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 11/76:05 am
GRK
-
ONT
1 stop5h 52m
American Airlines
Mon 11/2312:46 pm
ONT
-
GRK
1 stop6h 21m
American Airlines
Deal found 3/15$592
This American Airlines deal was found by Cheapflights users on 3/15. 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 11/66:05 am
GRK
-
ONT
1 stop5h 52m
American Airlines
Mon 11/2312:46 pm
ONT
-
GRK
1 stop6h 21m
American Airlines
Deal found 3/15$594
This American Airlines deal was found by Cheapflights users on 3/15. 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.
Mon 11/96:49 pm
GRK
-
ONT
1 stop5h 34m
American Airlines
Tue 11/2412:46 pm
ONT
-
GRK
1 stop6h 21m
American Airlines
Deal found 3/15$620

Find flight deals from Killeen to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Killeen (GRK) 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 20, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$365
(American Airlines)

One-way from

$196
(American Airlines)
Provider with most accurate pricing for Killeen Fort Hood Regional-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for Killeen Fort Hood Regional-Ontario flights.
Search Deals
From Killeen Fort Hood Regional to Ontario
Search Deals
One-way flight from Killeen Fort Hood Regional to Ontario
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Killeen 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 20, 2026.
Use the filters below to find and compare flights from Killeen to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

KilleenOntario

GRK - ONT

GRKONT

Killeen Fort Hood Regional

Sat 9/5

3:06 pm-6:57 pm

1 stop5h 51m

Ontario

Sat 9/12

10:25 am-6:54 pm

1 stop6h 29m

$365

KilleenOntario

GRK - ONT

GRKONT

Killeen Fort Hood Regional

Fri 4/10

7:09 pm-11:46 pm

1 stop6h 37m

Ontario

Sun 4/12

7:35 pm-9:35 am

2 stops12h 00m

$512

KilleenOntario

GRK - ONT

GRKONT

Killeen Fort Hood Regional

Thu 4/2

6:33 pm-11:59 pm

1 stop7h 26m

Ontario

Mon 4/6

11:58 pm-9:35 am

1 stop7h 37m

$571
Cheapest one-way
Quickest one-way

KilleenOntario

GRK - ONT

GRKONT

Killeen Fort Hood Regional

Sat 8/15

3:06 pm-9:08 pm

1 stop8h 02m

$196

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/16

Sorted by cheapest first

Compare providers for flights from Killeen 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 Killeen to Ontario in March.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
ExpediaPrice Accuracy1 starTrust 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 Killeen-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Killeen-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Killeen-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Killeen-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 Killeen-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 Killeen to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Killeen 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 Killeen to Ontario

What is the cheapest month to book a flight from Killeen to Ontario?

Currently, May is the cheapest month in which you can book a flight from Killeen to Ontario (average of $118). Flying from Killeen to Ontario in December is currently the most expensive (average of $217). 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.

Related info for your journey

Find useful and relevant information for your journey from Killeen to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Killeen to Ontario?

    Airlines like American Airlines fly from Killeen to Ontario in about 5h 51m. The time it takes to get you to your destination can typically vary by up to . Airlines will cover a distance of 1167 mi.

  • Can I find deals for flights from Killeen to Ontario that include hotel bookings?

    Yes. In addition to deals on Killeen to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Killeen to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Killeen to Ontario.

  • Can I find deals for business class flights from Killeen to Ontario?

    Yes. Cheapflights offers flight deals from Killeen 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 Killeen to Ontario?

    Currently, May is the cheapest month in which you can book a flight from Killeen to Ontario (average of $118). Flying from Killeen to Ontario in December is currently the most expensive (average of $217). 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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