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Killeen

$228+ Cheap flights from Ontario to Killeen (ONT - GRK)

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 9/20. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — GRK
Aug 18 — Aug 251
Mon 8/18
Mon 8/25
1 adult, Economy
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Cheap flight deals from Ontario to Killeen

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Killeen (GRK). 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 August 13, 2025.

Round-trip from

$305
(American Airlines)

One-way from

$228
(American Airlines)

Popular in

July

Cheapest in

May

Average price

$662
From Ontario to Killeen Fort Hood Regional
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One-way flight from Ontario to Killeen Fort Hood Regional
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Highest demand for flights based on searches. 25% potential increase in price ($176 potential increase over avg. RT price).
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Cheapest flight prices on average. 6% potential price decrease ($29 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from Ontario to Killeen

Cheapest flights from Ontario to Killeen
Explore the most affordable flight options available from Ontario to Killeen. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 13, 2025.

This American Airlines deal was found by Cheapflights users on 8/10. 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 9/202:54 pmONT - GRK
1 stop5h 51mAmerican Airlines
Sat 10/45:16 amGRK - ONT
1 stop6h 47mAmerican Airlines
Deal found 8/10$305
This American Airlines deal was found by Cheapflights users on 8/10. 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 9/202:54 pmONT - GRK
1 stop5h 51mAmerican Airlines
Sat 9/275:16 amGRK - ONT
2 stops8h 40mAmerican Airlines
Deal found 8/10$310
This American Airlines deal was found by Cheapflights users on 8/12. 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 9/68:15 amONT - GRK
1 stop5h 55mAmerican Airlines
Sat 9/204:40 pmGRK - ONT
1 stop7h 53mAmerican Airlines
Deal found 8/12$340
This American Airlines deal was found by Cheapflights users on 8/10. 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 9/202:54 pmONT - GRK
1 stop5h 51mAmerican Airlines
Sun 10/58:13 pmGRK - ONT
1 stop5h 46mAmerican Airlines
Deal found 8/10$362
This American Airlines deal was found by Cheapflights users on 8/10. 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 9/181:10 pmONT - GRK
2 stops8h 17mAmerican Airlines
Sat 10/45:16 amGRK - ONT
2 stops8h 40mAmerican Airlines
Deal found 8/10$372
This American Airlines deal was found by Cheapflights users on 8/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/236:10 amONT - GRK
1 stop7h 52mAmerican Airlines
Sat 9/610:17 amGRK - ONT
1 stop5h 37mAmerican Airlines
Deal found 8/11$375
This American Airlines deal was found by Cheapflights users on 8/10. 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.
Tue 9/231:10 pmONT - GRK
2 stops7h 22mAmerican Airlines
Wed 10/85:16 amGRK - ONT
2 stops8h 45mAmerican Airlines
Deal found 8/10$378

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Killeen 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 August 13, 2025.
Use the filters below to find and compare flights from Ontario to Killeen that are best for you.

Fly from

Ontario

Fly to

Killeen

Route

Depart

Return

Price

OntarioKilleen

ONT - GRK

ONTGRK

Ontario

Sat 9/20

2:54 pm-10:45 pm

1 stop5h 51m

Killeen Fort Hood Regional

Sat 10/4

5:16 am-10:03 am

1 stop6h 47m

$305

OntarioKilleen

ONT - GRK

ONTGRK

Ontario

Tue 9/23

12:47 pm-10:32 pm

1 stop7h 45m

Killeen Fort Hood Regional

Wed 10/8

2:48 pm-7:03 pm

1 stop6h 15m

$305

OntarioKilleen

ONT - GRK

ONTGRK

Ontario

Wed 10/1

2:54 pm-10:32 pm

1 stop5h 38m

Killeen Fort Hood Regional

Sat 10/4

10:17 am-1:54 pm

1 stop5h 37m

$305

OntarioKilleen

ONT - GRK

ONTGRK

Ontario

Sat 10/4

2:54 pm-10:45 pm

1 stop5h 51m

Killeen Fort Hood Regional

Sat 10/18

12:34 pm-4:28 pm

1 stop5h 54m

$305

OntarioKilleen

ONT - GRK

ONTGRK

Ontario

Wed 9/24

2:54 pm-10:32 pm

1 stop5h 38m

Killeen Fort Hood Regional

Wed 10/8

6:09 pm-10:42 pm

1 stop6h 33m

$305

OntarioKilleen

ONT - GRK

ONTGRK

Ontario

Sat 9/20

2:54 pm-10:45 pm

1 stop5h 51m

Killeen Fort Hood Regional

Sat 9/27

4:40 pm-10:33 pm

1 stop7h 53m

$305

OntarioKilleen

ONT - GRK

ONTGRK

Ontario

Tue 9/23

12:47 pm-10:32 pm

1 stop7h 45m

Killeen Fort Hood Regional

Tue 9/30

5:16 am-10:03 am

1 stop6h 47m

$305

OntarioKilleen

ONT - GRK

ONTGRK

Ontario

Sat 9/20

2:54 pm-10:45 pm

1 stop5h 51m

$228

OntarioKilleen

ONT - GRK

ONTGRK

Ontario

Thu 8/21

12:47 pm-7:25 pm

1 stop4h 38m

$321

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/12

Best time to book a flight from Ontario to Killeen

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

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

Currently, January is the cheapest month in which you can book a flight from Ontario to Killeen (average of $316). Flying from Ontario to Killeen in December is currently the most expensive (average of $468). 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 ONT to GRK?

Find hourly flight availability from Ontario to Killeen. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 13, 2025.

When flying from Ontario to Killeen, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 17% versus a flight in the morning.

Reviews of airlines servicing Killeen

Get insights into the airlines that provide service to Killeen. 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 Killeen. Reviews last updated August 13, 2025.
Get a feel of what it's like to fly with American Airlines from Ontario to Killeen by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
American Airlines
7.2
Good
10,000 reviews

Food

6.5

Crew

8.0

Overall

7.2

Comfort

7.2

Entertainment

6.9

Boarding

7.5

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2025

PIT - DFW

Due to gate changes,we nearly missed our flight. The gate agent reassigned our seats and would NOT give us our assigned seats,but she did honor that same request to the man who arrived after us. Her rudeness and difficulty was not appropriate.
American Airlines
7.2
Good
10,000 reviews
American Airlines
7.2
Good
10,000 reviews

Food

6.5

Crew

8.0

Overall

7.2

Comfort

7.2

Entertainment

6.9

Boarding

7.5

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2025

PIT - DFW

Due to gate changes,we nearly missed our flight. The gate agent reassigned our seats and would NOT give us our assigned seats,but she did honor that same request to the man who arrived after us. Her rudeness and difficulty was not appropriate.

Related info for your journey

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

  • What is the cheapest airline to fly from Ontario to Killeen round-trip?

    According to our current data, American Airlines ($305), offers the cheapest pricing from Ontario to Killeen.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from Ontario to Killeen (average of $316). Flying from Ontario to Killeen in December is currently the most expensive (average of $468). 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

Traveling to a place near Killeen?

Book flights to Killeen if you plan to visit one of these locations
Temple
Copperas Cove

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Alternative routes for Ontario to Killeen

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Top airline flying from Ontario to Killeen

Discover the top airline that operate flights from Ontario to Killeen. 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 August 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$304Average$384FlexibilityNo cancel feeOn-time71%

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