$175+ 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 7/18. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — GRK
Jul 19 — Jul 261
Round-trip
1 adult, Economy
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Find cheap flights from Ontario to Killeen with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Ontario to Killeen
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Best
Last-minute
One-way
Cheapest flights from Ontario to KilleenExplore 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 June 19, 2026.
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 June 19, 2026.
This American Airlines deal was found by Cheapflights users on 6/16. 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 7/45:34 am
ONT
- GRK
1 stop7h 04m
American Airlines
Thu 7/167:24 pm
GRK
- ONT
1 stop5h 08m
American Airlines
Deal found 6/16![American Airlines logo]()
$456
This American Airlines deal was found by Cheapflights users on 6/16. 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 7/45:34 am
ONT
- GRK
1 stop4h 49m
American Airlines
Sun 7/197:24 pm
GRK
- ONT
1 stop5h 08m
American Airlines
Deal found 6/16![American Airlines logo]()
$476
This American Airlines deal was found by Cheapflights users on 6/16. 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.
Tue 7/75:34 am
ONT
- GRK
1 stop4h 49m
American Airlines
Thu 7/167:24 pm
GRK
- ONT
1 stop5h 08m
American Airlines
Deal found 6/16![American Airlines logo]()
$508
This American Airlines deal was found by Cheapflights users on 6/16. 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 7/47:00 am
ONT
- GRK
1 stop7h 54m
American Airlines
Tue 7/146:30 am
GRK
- ONT
1 stop4h 59m
American Airlines
Deal found 6/16![American Airlines logo]()
$517
This American Airlines deal was found by Cheapflights users on 6/16. 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.
Tue 7/75:34 am
ONT
- GRK
1 stop4h 49m
American Airlines
Sun 7/197:24 pm
GRK
- ONT
1 stop5h 08m
American Airlines
Deal found 6/16![American Airlines logo]()
$528
This American Airlines deal was found by Cheapflights users on 6/16. 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.
Sun 7/512:59 am
ONT
- GRK
1 stop6h 37m
American Airlines
Thu 7/167:24 pm
GRK
- ONT
1 stop5h 08m
American Airlines
Deal found 6/16![American Airlines logo]()
$534
This American Airlines deal was found by Cheapflights users on 6/16. 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.
Sun 7/512:59 am
ONT
- GRK
1 stop6h 37m
American Airlines
Sun 7/197:24 pm
GRK
- ONT
1 stop5h 08m
American Airlines
Deal found 6/16![American Airlines logo]()
$554
This American Airlines deal was found by Cheapflights users on 6/16. 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.
Sun 7/55:34 am
ONT
- GRK
1 stop4h 49m
American Airlines
Thu 7/167:24 pm
GRK
- ONT
1 stop5h 08m
American Airlines
Deal found 6/16![American Airlines logo]()
$568
This American Airlines deal was found by Cheapflights users on 6/16. 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.
Sun 7/55:34 am
ONT
- GRK
1 stop4h 49m
American Airlines
Sun 7/197:24 pm
GRK
- ONT
1 stop5h 08m
American Airlines
Deal found 6/16![American Airlines logo]()
$588
This American Airlines deal was found by Cheapflights users on 6/18. 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.
Mon 6/2211:59 pm
ONT
- GRK
1 stop7h 35m
American Airlines
Wed 6/247:52 pm
GRK
- ONT
1 stop6h 07m
American Airlines
Deal found 6/18![American Airlines logo]()
$794
Best flights from Ontario to KilleenDiscover carefully curated flight deals from Ontario to Killeen that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 19, 2026.
Discover carefully curated flight deals from Ontario to Killeen that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 19, 2026.
This American Airlines deal was found by Cheapflights users on 6/16. 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 7/45:34 am
ONT
- GRK
1 stop7h 04m
American Airlines
Sat 7/187:53 pm
GRK
- ONT
1 stop6h 06m
American Airlines
Deal found 6/16![American Airlines logo]()
$456
This American Airlines deal was found by Cheapflights users on 6/16. 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.
Tue 7/75:34 am
ONT
- GRK
1 stop4h 49m
American Airlines
Thu 7/167:24 pm
GRK
- ONT
1 stop5h 08m
American Airlines
Deal found 6/16![American Airlines logo]()
$508
This American Airlines deal was found by Cheapflights users on 6/16. 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.
Wed 7/82:15 pm
ONT
- GRK
1 stop6h 12m
American Airlines
Sat 7/187:53 pm
GRK
- ONT
1 stop6h 06m
American Airlines
Deal found 6/16![American Airlines logo]()
$508
This American Airlines deal was found by Cheapflights users on 6/16. 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.
Thu 7/910:25 am
ONT
- GRK
1 stop6h 29m
American Airlines
Thu 7/167:24 pm
GRK
- ONT
1 stop5h 08m
American Airlines
Deal found 6/16![American Airlines logo]()
$508
This American Airlines deal was found by Cheapflights users on 6/16. 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.
Fri 7/105:34 am
ONT
- GRK
1 stop7h 04m
American Airlines
Sun 7/197:24 pm
GRK
- ONT
1 stop5h 08m
American Airlines
Deal found 6/16![American Airlines logo]()
$528
This American Airlines deal was found by Cheapflights users on 6/16. 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.
Sun 7/512:59 am
ONT
- GRK
1 stop6h 37m
American Airlines
Thu 7/167:24 pm
GRK
- ONT
1 stop5h 08m
American Airlines
Deal found 6/16![American Airlines logo]()
$534
Last-minute flights from Ontario to KilleenDiscover last-minute flight deals from Ontario to Killeen. Data last updated June 19, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Killeen. Data last updated June 19, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 6/18. 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.
Mon 6/2211:59 pm
ONT
- GRK
1 stop7h 35m
American Airlines
Wed 6/247:52 pm
GRK
- ONT
1 stop6h 07m
American Airlines
Deal found 6/18![American Airlines logo]()
$794
This American Airlines deal was found by Cheapflights users on 6/16. 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 7/45:34 am
ONT
- GRK
1 stop7h 04m
American Airlines
Thu 7/167:24 pm
GRK
- ONT
1 stop5h 08m
American Airlines
Deal found 6/16![American Airlines logo]()
$456
This American Airlines deal was found by Cheapflights users on 6/16. 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 7/45:34 am
ONT
- GRK
1 stop4h 49m
American Airlines
Sun 7/197:24 pm
GRK
- ONT
1 stop5h 08m
American Airlines
Deal found 6/16![American Airlines logo]()
$476
This American Airlines deal was found by Cheapflights users on 6/16. 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 7/47:00 am
ONT
- GRK
1 stop7h 54m
American Airlines
Tue 7/146:30 am
GRK
- ONT
1 stop4h 59m
American Airlines
Deal found 6/16![American Airlines logo]()
$517
This American Airlines deal was found by Cheapflights users on 6/16. 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.
Sun 7/512:59 am
ONT
- GRK
1 stop6h 37m
American Airlines
Thu 7/167:24 pm
GRK
- ONT
1 stop5h 08m
American Airlines
Deal found 6/16![American Airlines logo]()
$534
This American Airlines deal was found by Cheapflights users on 6/16. 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.
Sun 7/512:59 am
ONT
- GRK
1 stop6h 37m
American Airlines
Sun 7/197:24 pm
GRK
- ONT
1 stop5h 08m
American Airlines
Deal found 6/16![American Airlines logo]()
$554
This American Airlines deal was found by Cheapflights users on 6/16. 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.
Sun 7/55:34 am
ONT
- GRK
1 stop4h 49m
American Airlines
Thu 7/167:24 pm
GRK
- ONT
1 stop5h 08m
American Airlines
Deal found 6/16![American Airlines logo]()
$568
This American Airlines deal was found by Cheapflights users on 6/16. 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.
Sun 7/55:34 am
ONT
- GRK
1 stop4h 49m
American Airlines
Sun 7/197:24 pm
GRK
- ONT
1 stop5h 08m
American Airlines
Deal found 6/16![American Airlines logo]()
$588
This American Airlines deal was found by Cheapflights users on 6/16. 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.
Tue 7/75:34 am
ONT
- GRK
1 stop4h 49m
American Airlines
Thu 7/167:24 pm
GRK
- ONT
1 stop5h 08m
American Airlines
Deal found 6/16![American Airlines logo]()
$508
This American Airlines deal was found by Cheapflights users on 6/16. 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.
Tue 7/75:34 am
ONT
- GRK
1 stop4h 49m
American Airlines
Sun 7/197:24 pm
GRK
- ONT
1 stop5h 08m
American Airlines
Deal found 6/16![American Airlines logo]()
$528
One-way flights from Ontario to KilleenSearch for one-way flight options from Ontario to Killeen. Find affordable one-way fares based on user searches. Data last updated June 19, 2026.
Search for one-way flight options from Ontario to Killeen. Find affordable one-way fares based on user searches. Data last updated June 19, 2026.
This American Airlines deal was found by Cheapflights users on 6/16. 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 7/1811:59 pm
ONT
- GRK
1 stop7h 37m
American Airlines
Deal found 6/16![American Airlines logo]()
$175
This American Airlines deal was found by Cheapflights users on 6/19. 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.
Sun 7/197:00 am
ONT
- GRK
1 stop5h 38m
American Airlines
Deal found 6/19![American Airlines logo]()
$422
This American Airlines deal was found by Cheapflights users on 6/18. 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.
Wed 7/225:34 am
ONT
- GRK
1 stop4h 49m
American Airlines
Deal found 6/18![American Airlines logo]()
$441
Find 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 June 19, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $456 (American Airlines) |
One-way from | $175 (American Airlines) |
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 June 19, 2026.
Use the filters below to find and compare flights from Ontario to Killeen that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
OntarioKilleen
ONT - GRK
ONTGRK
Ontario
Sat 7/4
5:34 am-2:38 pm
1 stop7h 04m
Killeen Fort Hood Regional
Sat 7/18
7:53 pm-11:59 pm
1 stop6h 06m
$456
Quickest round-trip
OntarioKilleen
ONT - GRK
ONTGRK
Ontario
Tue 7/7
5:34 am-12:23 pm
1 stop4h 49m
Killeen Fort Hood Regional
Thu 7/16
7:24 pm-10:32 pm
1 stop5h 08m
$508
OntarioKilleen
ONT - GRK
ONTGRK
Ontario
Wed 7/8
2:15 pm-10:27 pm
1 stop6h 12m
Killeen Fort Hood Regional
Sat 7/18
7:53 pm-11:59 pm
1 stop6h 06m
$508
OntarioKilleen
ONT - GRK
ONTGRK
Ontario
Thu 7/9
10:25 am-6:54 pm
1 stop6h 29m
Killeen Fort Hood Regional
Thu 7/16
7:24 pm-10:32 pm
1 stop5h 08m
$508
OntarioKilleen
ONT - GRK
ONTGRK
Ontario
Fri 7/10
5:34 am-2:38 pm
1 stop7h 04m
Killeen Fort Hood Regional
Sun 7/19
7:24 pm-10:32 pm
1 stop5h 08m
$528
OntarioKilleen
ONT - GRK
ONTGRK
Ontario
Sun 7/5
12:59 am-9:36 am
1 stop6h 37m
Killeen Fort Hood Regional
Thu 7/16
7:24 pm-10:32 pm
1 stop5h 08m
$534
Cheapest one-way
OntarioKilleen
ONT - GRK
ONTGRK
Ontario
Sat 7/18
11:59 pm-9:36 am
1 stop7h 37m
$175
OntarioKilleen
ONT - GRK
ONTGRK
Ontario
Tue 7/21
10:25 am-6:54 pm
1 stop6h 29m
$373
OntarioKilleen
ONT - GRK
ONTGRK
Ontario
Fri 7/24
2:15 pm-10:27 pm
1 stop6h 12m
$422
Quickest one-way
OntarioKilleen
ONT - GRK
ONTGRK
Ontario
Sun 7/19
7:00 am-2:38 pm
1 stop5h 38m
$422
Sorted by cheapest first
Compare providers for flights from Ontario to Killeen
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 Ontario to Killeen in June.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Ontario-Killeen flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Killeen flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Killeen flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Ontario-Killeen 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 Ontario-Killeen 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 Ontario to Killeen
Have a flexible travel schedule? Discover the best time to fly to Killeen from Ontario with our price prediction graph.
ONT-GRK
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.
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 June 19, 2026.
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.
Entertainment
6.8
Overall
7.1
Crew
7.9
Boarding
7.5
Food
6.4
Comfort
7.2
Reviews
1 / 20
8.0
ExcellentMonica,Nov 2025
JAC - DFW
Entertainment
6.8
Overall
7.1
Crew
7.9
Boarding
7.5
Food
6.4
Comfort
7.2
Reviews
1 / 20
8.0
ExcellentMonica,Nov 2025
JAC - DFW
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.
Traveling to a place near Killeen?
Book flights to Killeen if you plan to visit one of these locationsTemple
Copperas Cove
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Ontario and Killeen flights
Browse other Ontario and Killeen flight options. Last updated on June 19, 2026.
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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 June 19, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$304 | Average$402 | FlexibilityNo cancel fee | On-time71% |