$264+ 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 10/11. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — GRK
Sep 3 — Sep 101
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 August 4, 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 August 4, 2026.
This American Airlines deal was found by Cheapflights users on 7/31. 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 9/32:27 pm -
1 stop7h 12m
Mon 9/75:00 am -
1 stop6h 34m
Deal found 7/31![American Airlines logo]()
$357
This American Airlines deal was found by Cheapflights users on 7/31. 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 9/412:33 pm -
1 stop6h 26m
Mon 9/75:00 am -
1 stop6h 34m
Deal found 7/31![American Airlines logo]()
$377
This American Airlines deal was found by Cheapflights users on 7/31. 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 8/287:05 am -
1 stop5h 30m
Fri 9/43:05 pm -
1 stop5h 42m
Deal found 7/31![American Airlines logo]()
$437
This American Airlines deal was found by Cheapflights users on 7/31. 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 10/102:22 pm -
1 stop7h 14m
Wed 10/143:16 pm -
1 stop5h 28m
Deal found 7/31![American Airlines logo]()
$457
This American Airlines deal was found by Cheapflights users on 8/4. 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 8/56:00 am -
1 stop6h 35m
Sat 8/85:00 am -
1 stop6h 34m
Deal found 8/4![American Airlines logo]()
$485
This American Airlines deal was found by Cheapflights users on 8/4. 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 8/66:00 am -
1 stop6h 35m
Sat 8/87:00 am -
1 stop6h 43m
Deal found 8/4![American Airlines logo]()
$513
This American Airlines deal was found by Cheapflights users on 8/1. 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 11/611:59 pm -
1 stop7h 28m
Wed 11/115:00 am -
2 stops9h 38m
Deal found 8/1![American Airlines logo]()
$516
This American Airlines deal was found by Cheapflights users on 8/4. 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 8/67:05 am -
1 stop5h 30m
Sun 8/97:22 pm -
1 stop5h 37m
Deal found 8/4![American Airlines logo]()
$541
This American Airlines deal was found by Cheapflights users on 7/31. 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 10/102:22 pm -
1 stop7h 14m
Mon 10/127:03 pm -
1 stop6h 49m
Deal found 7/31![American Airlines logo]()
$542
This American Airlines deal was found by Cheapflights users on 8/3. 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 12/317:10 am -
1 stop6h 19m
Sat 1/95:00 pm -
1 stop7h 49m
Deal found 8/3![American Airlines logo]()
$582
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 August 4, 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 August 4, 2026.
This American Airlines deal was found by Cheapflights users on 7/31. 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 8/287:05 am -
1 stop5h 30m
Fri 9/43:05 pm -
1 stop5h 42m
Deal found 7/31![American Airlines logo]()
$440
This American Airlines deal was found by Cheapflights users on 7/31. 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 10/102:22 pm -
1 stop7h 14m
Wed 10/143:16 pm -
1 stop5h 28m
Deal found 7/31![American Airlines logo]()
$457
This American Airlines deal was found by Cheapflights users on 8/2. 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 9/1410:25 am -
1 stop6h 20m
Fri 9/1810:04 am -
1 stop5h 21m
Deal found 8/2![American Airlines logo]()
$607
This American Airlines deal was found by Cheapflights users on 8/3. 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 8/136:00 am -
1 stop6h 35m
Sat 8/159:59 am -
1 stop5h 54m
Deal found 8/3![American Airlines logo]()
$613
This KAYAK deal was found by Cheapflights users on 7/31. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/162:27 pm -
1 stop7h 12m
Mon 8/175:00 am -
1 stop6h 34m
Deal found 7/31![American Airlines logo]()
$717
This American Airlines deal was found by Cheapflights users on 8/3. 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 8/1012:33 pm -
1 stop6h 26m
Wed 8/125:00 am -
1 stop6h 34m
Deal found 8/3![American Airlines logo]()
$730
This American Airlines deal was found by Cheapflights users on 8/3. 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 8/106:00 am -
1 stop6h 35m
Thu 8/139:59 am -
1 stop5h 32m
Deal found 8/3![American Airlines logo]()
$747
This American Airlines deal was found by Cheapflights users on 8/3. 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 8/106:15 am -
2 stops10h 37m
Fri 8/149:59 am -
1 stop5h 32m
Deal found 8/3![American Airlines logo]()
$820
Last-minute flights from Ontario to KilleenDiscover last-minute flight deals from Ontario to Killeen. Data last updated August 4, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Killeen. Data last updated August 4, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 8/4. 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 8/56:00 am -
1 stop6h 35m
Sat 8/85:00 am -
1 stop6h 34m
Deal found 8/4![American Airlines logo]()
$485
This American Airlines deal was found by Cheapflights users on 8/4. 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 8/66:00 am -
1 stop6h 35m
Sat 8/87:00 am -
1 stop6h 43m
Deal found 8/4![American Airlines logo]()
$513
This American Airlines deal was found by Cheapflights users on 8/4. 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 8/67:05 am -
1 stop5h 30m
Sun 8/97:22 pm -
1 stop5h 37m
Deal found 8/4![American Airlines logo]()
$541
This American Airlines deal was found by Cheapflights users on 8/3. 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 8/136:00 am -
1 stop6h 35m
Sat 8/159:59 am -
1 stop5h 54m
Deal found 8/3![American Airlines logo]()
$613
This American Airlines deal was found by Cheapflights users on 7/31. 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 8/287:05 am -
1 stop5h 30m
Fri 9/43:05 pm -
1 stop5h 42m
Deal found 7/31![American Airlines logo]()
$437
This American Airlines deal was found by Cheapflights users on 7/31. 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 9/32:27 pm -
1 stop7h 12m
Mon 9/75:00 am -
1 stop6h 34m
Deal found 7/31![American Airlines logo]()
$357
This American Airlines deal was found by Cheapflights users on 7/31. 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 9/412:33 pm -
1 stop6h 26m
Mon 9/75:00 am -
1 stop6h 34m
Deal found 7/31![American Airlines logo]()
$377
This American Airlines deal was found by Cheapflights users on 8/2. 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 9/1410:25 am -
1 stop6h 20m
Fri 9/1810:04 am -
1 stop5h 21m
Deal found 8/2![American Airlines logo]()
$607
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 August 4, 2026.
Search for one-way flight options from Ontario to Killeen. Find affordable one-way fares based on user searches. Data last updated August 4, 2026.
This American Airlines deal was found by Cheapflights users on 7/31. 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 10/1111:59 pm -
1 stop7h 24m
Deal found 7/31![American Airlines logo]()
$264
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 August 4, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $357 (American Airlines) |
One-way from | $264 (American Airlines) |
Popular in | August |
Cheapest in | September |
Average price | $767 |
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 4, 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
Quickest round-trip
OntarioKilleen
ONT - GRK
ONTGRK
Ontario
Fri 8/28
7:05 am-2:35 pm
1 stop5h 30m
Killeen Fort Hood Regional
Fri 9/4
3:05 pm-6:47 pm
1 stop5h 42m
$440
OntarioKilleen
ONT - GRK
ONTGRK
Ontario
Sat 10/10
2:22 pm-11:36 pm
1 stop7h 14m
Killeen Fort Hood Regional
Wed 10/14
3:16 pm-6:44 pm
1 stop5h 28m
$457
OntarioKilleen
ONT - GRK
ONTGRK
Ontario
Mon 9/14
10:25 am-6:45 pm
1 stop6h 20m
Killeen Fort Hood Regional
Fri 9/18
10:04 am-1:25 pm
1 stop5h 21m
$607
OntarioKilleen
ONT - GRK
ONTGRK
Ontario
Thu 8/13
6:00 am-2:35 pm
1 stop6h 35m
Killeen Fort Hood Regional
Sat 8/15
9:59 am-1:53 pm
1 stop5h 54m
$613
OntarioKilleen
ONT - GRK
ONTGRK
Ontario
Sun 8/16
2:27 pm-11:39 pm
1 stop7h 12m
Killeen Fort Hood Regional
Mon 8/17
5:00 am-9:34 am
1 stop6h 34m
$717
OntarioKilleen
ONT - GRK
ONTGRK
Ontario
Mon 8/10
12:33 pm-8:59 pm
1 stop6h 26m
Killeen Fort Hood Regional
Wed 8/12
5:00 am-9:34 am
1 stop6h 34m
$730
OntarioKilleen
ONT - GRK
ONTGRK
Ontario
Mon 8/10
6:00 am-2:35 pm
1 stop6h 35m
Killeen Fort Hood Regional
Thu 8/13
9:59 am-1:31 pm
1 stop5h 32m
$747
OntarioKilleen
ONT - GRK
ONTGRK
Ontario
Mon 8/10
6:15 am-6:52 pm
2 stops10h 37m
Killeen Fort Hood Regional
Fri 8/14
9:59 am-1:31 pm
1 stop5h 32m
$820
Cheapest one-way
Quickest one-way
OntarioKilleen
ONT - GRK
ONTGRK
Ontario
Sun 10/11
11:59 pm-9:23 am
1 stop7h 24m
$264
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 August.
| 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 August 4, 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.
Food
6.4
Crew
7.9
Boarding
7.5
Overall
7.1
Comfort
7.2
Entertainment
6.8
Reviews
1 / 20
2.0
MediocreChi,Sep 2023
ONT - PHX
Food
6.4
Crew
7.9
Boarding
7.5
Overall
7.1
Comfort
7.2
Entertainment
6.8
Reviews
1 / 20
2.0
MediocreChi,Sep 2023
ONT - PHX
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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Complete your trip
Complete your trip to Killeen by adding a car rental and/or hotel reservation to your travel itinerary.
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Find flights from Ontario to Killeen, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Ontario and Killeen flights
Browse other Ontario and Killeen flight options. Last updated on August 4, 2026.
Other flights from Ontario
Browse through other flights departing from Ontario. Flights are based on user searches made on Cheapflights and were last updated on August 4, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
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 4, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$304 | Average$402 | FlexibilityNo cancel fee | On-time71% |