$199+ Cheap flights from Killeen to Ontario (GRK - ONT)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/1. Fares are subject to change and may not be available on all flights or dates of travel.
GRK — ONT
Oct 17 — Oct 241
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
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
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 Killeen to Ontario
Cheapest
Best
Last-minute
One-way
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 September 17, 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 September 17, 2026.
This American Airlines deal was found by Cheapflights users on 9/16. 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 10/257:02 pm -
1 stop6h 50m
Sun 11/17:00 am -
1 stop5h 37m
Deal found 9/16![American Airlines logo]()
$437
This American Airlines deal was found by Cheapflights users on 9/14. 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.
Sat 9/194:09 pm -
1 stop5h 58m
Mon 9/218:25 am -
1 stop5h 09m
Deal found 9/14![American Airlines logo]()
$543
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 September 17, 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 September 17, 2026.
This American Airlines deal was found by Cheapflights users on 9/16. 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 10/257:02 pm -
1 stop6h 50m
Sun 11/11:27 pm -
2 stops8h 17m
Deal found 9/16![American Airlines logo]()
$737
Last-minute flights from Killeen to OntarioDiscover last-minute flight deals from Killeen to Ontario. Data last updated September 17, 2026 and is based on user searches.
Discover last-minute flight deals from Killeen to Ontario. Data last updated September 17, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 9/14. 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.
Sat 9/194:09 pm -
1 stop5h 58m
Mon 9/218:25 am -
1 stop5h 09m
Deal found 9/14![American Airlines logo]()
$543
This American Airlines deal was found by Cheapflights users on 9/16. 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 10/257:02 pm -
1 stop6h 50m
Sun 11/17:00 am -
1 stop5h 37m
Deal found 9/16![American Airlines logo]()
$437
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 September 17, 2026.
Search for one-way flight options from Killeen to Ontario. Find affordable one-way fares based on user searches. Data last updated September 17, 2026.
This American Airlines deal was found by Cheapflights users on 9/16. 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 12/15:00 am -
1 stop6h 47m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![American Airlines logo]()
$199
This American Airlines deal was found by Cheapflights users on 9/15. 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.
Sun 9/2712:47 pm -
1 stop8h 06m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![American Airlines logo]()
$291
This American Airlines deal was found by Cheapflights users on 9/14. 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.
Mon 11/306:45 pm -
1 stop5h 51m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/14![American Airlines logo]()
$424
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 September 17, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $437 (American Airlines) |
One-way from | $199 (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 7,457,451 searches. Data last updated September 17, 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 Killeen Fort Hood Regional - ONT Ontario
GRKONT
Killeen Fort Hood Regional
Tue 12/1
5:00 am-9:47 am
1 stop6h 47m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$199
KilleenOntario
GRK Killeen Fort Hood Regional - ONT Ontario
GRKONT
Killeen Fort Hood Regional
Sun 9/27
12:47 pm-6:53 pm
1 stop8h 06m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$291
Quickest round-trip
KilleenOntario
GRK Killeen Fort Hood Regional - ONT Ontario
GRKONT
Killeen Fort Hood Regional
Mon 11/30
6:45 pm-10:36 pm
1 stop5h 51m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$424
KilleenOntario
GRK Killeen Fort Hood Regional - ONT Ontario
GRKONT
Killeen Fort Hood Regional
Sun 10/25
7:02 pm-11:52 pm
1 stop6h 50m
Ontario
Sun 11/1
1:27 pm-11:44 pm
2 stops8h 17m
$737
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 September.
| 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 September 17, 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.
Entertainment
6.8
Crew
7.9
Food
6.4
Comfort
7.2
Overall
7.1
Boarding
7.4
Reviews
1 / 20
8.0
ExcellentAnonymous,Aug 2023
DFW - SBA
Entertainment
6.8
Crew
7.9
Food
6.4
Comfort
7.2
Overall
7.1
Boarding
7.4
Reviews
1 / 20
8.0
ExcellentAnonymous,Aug 2023
DFW - SBA
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.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Ontario flight routes
Other flight options
Popular flights
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 September 17, 2026.
Killeen and Ontario flights
Browse other Killeen and Ontario flight options. Last updated on September 17, 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 7,457,451 searches. Data last updated September 17, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$425 | Average$568 | FlexibilityNo cancel fee | On-time71% |