$175+ 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 8/8. Fares are subject to change and may not be available on all flights or dates of travel.
GRK — ONT
Jul 16 — Jul 231
Round-trip
1 adult, Economy
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Find cheap flights from Killeen to Ontario 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
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Best
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Cheapest flights from Killeen to OntarioExplore 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 June 16, 2026.
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 June 16, 2026.
This American Airlines deal was found by Cheapflights users on 6/11. 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 10/247:22 pm
GRK
- ONT
1 stop5h 44m
American Airlines
Mon 10/2611:59 pm
ONT
- GRK
1 stop7h 29m
American Airlines
Deal found 6/11![American Airlines logo]()
$447
This American Airlines deal was found by Cheapflights users on 6/11. 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 10/245:00 am
GRK
- ONT
1 stop6h 29m
American Airlines
Sat 10/2411:59 pm
ONT
- GRK
1 stop7h 29m
American Airlines
Deal found 6/11![American Airlines logo]()
$449
This American Airlines deal was found by Cheapflights users on 6/13. 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 6/267:21 pm
GRK
- ONT
1 stop6h 38m
American Airlines
Sun 6/2811:59 pm
ONT
- GRK
1 stop7h 35m
American Airlines
Deal found 6/13![American Airlines logo]()
$521
This American Airlines deal was found by Cheapflights users on 6/11. 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.
Fri 10/237:22 pm
GRK
- ONT
1 stop5h 44m
American Airlines
Sat 10/246:00 am
ONT
- GRK
1 stop6h 39m
American Airlines
Deal found 6/11![American Airlines logo]()
$533
This American Airlines deal was found by Cheapflights users on 6/12. 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.
Wed 6/177:52 pm
GRK
- ONT
1 stop6h 07m
American Airlines
Mon 6/2211:59 pm
ONT
- GRK
1 stop7h 35m
American Airlines
Deal found 6/12![American Airlines logo]()
$549
This American Airlines deal was found by Cheapflights users on 6/13. 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 7/187:53 pm
GRK
- ONT
1 stop6h 06m
American Airlines
Sat 7/2511:59 pm
ONT
- GRK
1 stop7h 37m
American Airlines
Deal found 6/13![American Airlines logo]()
$605
This American Airlines deal was found by Cheapflights users on 6/11. 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.
Fri 10/233:06 pm
GRK
- ONT
1 stop5h 51m
American Airlines
Sun 10/2511:59 pm
ONT
- GRK
1 stop7h 29m
American Airlines
Deal found 6/11![American Airlines logo]()
$619
This American Airlines deal was found by Cheapflights users on 6/11. 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.
Thu 12/246:32 pm
GRK
- ONT
1 stop7h 14m
American Airlines
Sun 12/2711:59 pm
ONT
- GRK
1 stop7h 52m
American Airlines
Deal found 6/11![American Airlines logo]()
$644
Best flights from Killeen to OntarioDiscover carefully curated flight deals from Killeen to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 16, 2026.
Discover carefully curated flight deals from Killeen to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 16, 2026.
This American Airlines deal was found by Cheapflights users on 6/11. 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 10/245:00 am
GRK
- ONT
1 stop6h 29m
American Airlines
Sat 10/2411:59 pm
ONT
- GRK
1 stop7h 29m
American Airlines
Deal found 6/11![American Airlines logo]()
$449
This American Airlines deal was found by Cheapflights users on 6/13. 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 6/267:21 pm
GRK
- ONT
1 stop6h 38m
American Airlines
Sun 6/2811:59 pm
ONT
- GRK
1 stop7h 35m
American Airlines
Deal found 6/13![American Airlines logo]()
$521
This American Airlines deal was found by Cheapflights users on 6/11. 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.
Fri 10/237:22 pm
GRK
- ONT
1 stop5h 44m
American Airlines
Sat 10/246:00 am
ONT
- GRK
1 stop6h 39m
American Airlines
Deal found 6/11![American Airlines logo]()
$533
This American Airlines deal was found by Cheapflights users on 6/11. 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 10/2410:04 am
GRK
- ONT
2 stops9h 43m
American Airlines
Mon 10/2611:59 pm
ONT
- GRK
1 stop7h 29m
American Airlines
Deal found 6/11![American Airlines logo]()
$582
This American Airlines deal was found by Cheapflights users on 6/13. 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 7/187:53 pm
GRK
- ONT
1 stop6h 06m
American Airlines
Sat 7/2511:59 pm
ONT
- GRK
1 stop7h 37m
American Airlines
Deal found 6/13![American Airlines logo]()
$605
This American Airlines deal was found by Cheapflights users on 6/11. 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 10/2410:04 am
GRK
- ONT
2 stops6h 51m
American Airlines
Sun 10/2511:59 pm
ONT
- GRK
1 stop7h 29m
American Airlines
Deal found 6/11![American Airlines logo]()
$668
Last-minute flights from Killeen to OntarioDiscover last-minute flight deals from Killeen to Ontario. Data last updated June 16, 2026 and is based on user searches.
Discover last-minute flight deals from Killeen to Ontario. Data last updated June 16, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 6/12. 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.
Wed 6/177:52 pm
GRK
- ONT
1 stop6h 07m
American Airlines
Mon 6/2211:59 pm
ONT
- GRK
1 stop7h 35m
American Airlines
Deal found 6/12![American Airlines logo]()
$549
This American Airlines deal was found by Cheapflights users on 6/13. 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 6/267:21 pm
GRK
- ONT
1 stop6h 38m
American Airlines
Sun 6/2811:59 pm
ONT
- GRK
1 stop7h 35m
American Airlines
Deal found 6/13![American Airlines logo]()
$521
This American Airlines deal was found by Cheapflights users on 6/13. 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 7/187:53 pm
GRK
- ONT
1 stop6h 06m
American Airlines
Sat 7/2511:59 pm
ONT
- GRK
1 stop7h 37m
American Airlines
Deal found 6/13![American Airlines logo]()
$605
One-way flights from Killeen to OntarioSearch for one-way flight options from Killeen to Ontario. Find affordable one-way fares based on user searches. Data last updated June 16, 2026.
Search for one-way flight options from Killeen to Ontario. Find affordable one-way fares based on user searches. Data last updated June 16, 2026.
This American Airlines deal was found by Cheapflights users on 6/12. 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 8/155:00 am
GRK
- ONT
1 stop6h 34m
American Airlines
Deal found 6/12![American Airlines logo]()
$175
This American Airlines deal was found by Cheapflights users on 6/14. 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 8/55:00 am
GRK
- ONT
1 stop6h 34m
American Airlines
Deal found 6/14![American Airlines logo]()
$225
This American Airlines deal was found by Cheapflights users on 6/14. 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 8/95:00 am
GRK
- ONT
1 stop6h 34m
American Airlines
Deal found 6/14![American Airlines logo]()
$310
This American Airlines deal was found by Cheapflights users on 6/14. 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 8/67:22 pm
GRK
- ONT
1 stop5h 37m
American Airlines
Deal found 6/14![American Airlines logo]()
$334
This American Airlines deal was found by Cheapflights users on 6/14. 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 8/79:59 am
GRK
- ONT
2 stops7h 20m
American Airlines
Deal found 6/14![American Airlines logo]()
$459
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 June 16, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $447 (American Airlines) |
One-way from | $175 (American Airlines) |
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 June 16, 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
Cheapest round-trip
KilleenOntario
GRK - ONT
GRKONT
Killeen Fort Hood Regional
Sat 10/24
5:00 am-9:29 am
1 stop6h 29m
Ontario
Sat 10/24
11:59 pm-9:28 am
1 stop7h 29m
$449
KilleenOntario
GRK - ONT
GRKONT
Killeen Fort Hood Regional
Fri 6/26
7:21 pm-11:59 pm
1 stop6h 38m
Ontario
Sun 6/28
11:59 pm-9:34 am
1 stop7h 35m
$521
Quickest round-trip
KilleenOntario
GRK - ONT
GRKONT
Killeen Fort Hood Regional
Fri 10/23
7:22 pm-11:06 pm
1 stop5h 44m
Ontario
Sat 10/24
6:00 am-2:39 pm
1 stop6h 39m
$533
KilleenOntario
GRK - ONT
GRKONT
Killeen Fort Hood Regional
Sat 10/24
10:04 am-5:47 pm
2 stops9h 43m
Ontario
Mon 10/26
11:59 pm-9:28 am
1 stop7h 29m
$582
KilleenOntario
GRK - ONT
GRKONT
Killeen Fort Hood Regional
Sat 7/18
7:53 pm-11:59 pm
1 stop6h 06m
Ontario
Sat 7/25
11:59 pm-9:36 am
1 stop7h 37m
$605
KilleenOntario
GRK - ONT
GRKONT
Killeen Fort Hood Regional
Sat 10/24
10:04 am-2:55 pm
2 stops6h 51m
Ontario
Sun 10/25
11:59 pm-9:28 am
1 stop7h 29m
$668
Cheapest one-way
Quickest one-way
KilleenOntario
GRK - ONT
GRKONT
Killeen Fort Hood Regional
Sat 8/8
9:59 am-1:53 pm
1 stop5h 54m
$175
KilleenOntario
GRK - ONT
GRKONT
Killeen Fort Hood Regional
Sat 8/15
5:00 am-9:34 am
1 stop6h 34m
$175
KilleenOntario
GRK - ONT
GRKONT
Killeen Fort Hood Regional
Wed 8/5
5:00 am-9:34 am
1 stop6h 34m
$225
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 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 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.
GRK-ONT
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 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 June 16, 2026.
Peruse reviews from past customers who have flown with American Airlines from Killeen to Ontario to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
7.5
Overall
7.1
Crew
7.9
Entertainment
6.8
Food
6.4
Comfort
7.2
Reviews
1 / 20
2.0
MediocreAnonymous,Apr 2026
DFW - BDL
Boarding
7.5
Overall
7.1
Crew
7.9
Entertainment
6.8
Food
6.4
Comfort
7.2
Reviews
1 / 20
2.0
MediocreAnonymous,Apr 2026
DFW - BDL
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.
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Alternative routes for Killeen to Ontario
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Ontario by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Killeen to Ontario by cabin class
Find flights from Killeen to Ontario, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Other flights to Ontario
Explore flights to Ontario departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on June 16, 2026.
Killeen and Ontario flights
Browse other Killeen and Ontario flight options. Last updated on June 16, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top airline flying from Killeen to Ontario
Discover the top airline that operate flights from Killeen 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 June 16, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$339 | Average$568 | FlexibilityNo cancel fee | On-time71% |