$29+ Cheap flights from Ontario (ONT) to the United States
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 1/30. Fares are subject to change and may not be available on all flights or dates of travel.
Find cheap flights from Ontario to USA 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 USA
Cheapest flights from Ontario to USAExplore the most affordable flight options available from Ontario to USA. Find the lowest fares from popular airlines and budget airlines, with prices last updated on enero 20, 2026.
Explore the most affordable flight options available from Ontario to USA. Find the lowest fares from popular airlines and budget airlines, with prices last updated on enero 20, 2026.
This Super.com deal was found by Cheapflights users on 1/18. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Frontier deal was found by Cheapflights users on 1/17. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This CheapOair deal was found by Cheapflights users on 1/20. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Booking.com deal was found by Cheapflights users on 1/19. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Priceline deal was found by Cheapflights users on 1/18. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Frontier deal was found by Cheapflights users on 1/19. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This CheapOair deal was found by Cheapflights users on 1/19. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Priceline deal was found by Cheapflights users on 1/19. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Frontier deal was found by Cheapflights users on 1/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Super.com deal was found by Cheapflights users on 1/19. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This CheapOair deal was found by Cheapflights users on 1/20. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Super.com deal was found by Cheapflights users on 1/18. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Find flight deals from Ontario to USA
Keep the following information in mind while searching for Ontario to USA flight deals. Data was last updated enero 20, 2026.
Most accurate provider | CheapOair 3 stars |
|---|---|
Most trusted provider | CheapOair 3 stars |
Round-trip from | $59 (Super.com) |
One-way from | $29 (Frontier) |
Popular in | December |
Cheapest in | February |
Average price | $287 |
Good round-trip deal | $84 or less |
Good one-way deal | $107 or less |
Cheapflights Fare Finder
Use the filters below to find and compare flights from Ontario to the United States that are best for you.
Fly from
Fly to
Route
Depart
Return
Price
OntarioDallas
ONT - DFW
ONTDFW
Ontario
dom. 2/22
2:06 pm-7:11 pm
Nonstop3h 05m
Dallas/Fort Worth
mié. 2/25
11:55 am-9:34 pm
1 stop11h 39m
OntarioDallas
ONT - DFW
ONTDFW
Ontario
lun. 2/9
3:36 pm-8:36 pm
Nonstop3h 00m
Dallas/Fort Worth
jue. 2/12
5:45 am-9:34 am
1 stop5h 49m
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
sáb. 4/4
5:53 pm-8:50 pm
Nonstop2h 57m
Seattle/Tacoma Intl
mié. 4/15
8:25 am-11:13 am
Nonstop2h 48m
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
mar. 2/24
7:30 am-10:34 am
Nonstop3h 04m
Seattle/Tacoma Intl
mar. 3/3
11:15 am-1:54 pm
Nonstop2h 39m
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
sáb. 2/14
3:30 pm-6:33 pm
Nonstop3h 03m
Seattle/Tacoma Intl
sáb. 2/21
7:55 pm-10:37 pm
Nonstop2h 42m
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
sáb. 2/28
4:02 pm-6:52 pm
Nonstop2h 50m
Seattle/Tacoma Intl
lun. 3/2
8:30 am-11:08 am
Nonstop2h 38m
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
vie. 2/27
3:30 pm-6:33 pm
Nonstop3h 03m
Seattle/Tacoma Intl
sáb. 2/28
7:55 pm-10:37 pm
Nonstop2h 42m
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
mié. 4/8
11:59 am-2:55 pm
Nonstop2h 56m
Seattle/Tacoma Intl
lun. 4/13
7:50 pm-10:37 pm
Nonstop2h 47m
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
sáb. 2/14
3:30 pm-6:33 pm
Nonstop3h 03m
Seattle/Tacoma Intl
jue. 2/19
7:00 pm-11:49 pm
1 stop4h 49m
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
sáb. 2/28
3:30 pm-6:33 pm
Nonstop3h 03m
Seattle/Tacoma Intl
lun. 3/2
7:00 pm-11:49 pm
1 stop4h 49m
Best time to book a flight from Ontario to USA
Have a flexible travel schedule? Discover the best time to fly to USA from Ontario with our price prediction graph.
Cheapflights Insights
Everything you need to know about your flight from Ontario to the United States
What is the cheapest month to book a flight from Ontario to USA?
Currently, February is the cheapest month in which you can book a flight from Ontario to USA (average of $19). Flying from Ontario to USA in July is currently the most expensive (average of $49). 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 US?
Find hourly flight availability from Ontario to USA. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated enero 20, 2026.
A simple way to save on the total cost of your ticket is to fly from Ontario to USA in the afternoon. If you’re flexible enough to do this you can expect to save up to 28% on your trip compared to booking a flight in the morning.
What is the cheapest day to fly from Ontario to USA?
Use this chart to determine the cheapest time to fly round-trip from Ontario to USA. Price data was last updated on January 17, 2026.
Travelers seeking maximum savings on their Ontario to USA flight should consider departing on Wednesday at noon when fares are most often at their lowest. Wednesday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
How often are flights from Ontario to the United States delayed?
About 13% of weekly flights between Ontario and United States have experienced delays in the past year, with the average delay time being 124 minutes.
What is the most punctual flight time for Ontario to the United States flights?
Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the evening tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Saturday tends to have the lowest number of delays on this route, whereas Monday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on Ontario to the United States flights?
Over the last year, Delta have had the lowest number of delays on this route, with just 4% of flights being delayed.
Reviews of airlines servicing USA
Get insights into the airlines that provide service to USA. 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 USA. Reviews last updated enero 20, 2026.
Read reviews from past customers who have flown Southwest, Delta, and United Airlines from Ontario to the United States. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Comfort
Crew
Food
Boarding
Entertainment
Overall
Reviews
William Drew,Nov 2025
SJC - HNL
Comfort
Crew
Food
Boarding
Entertainment
Overall
Reviews
William Drew,Nov 2025
SJC - HNL
Comfort
Crew
Food
Boarding
Entertainment
Overall
Reviews
William Drew,Nov 2025
SJC - HNL
Comfort
Crew
Food
Boarding
Entertainment
Overall
Reviews
William Drew,Nov 2025
SJC - HNL
Comfort
Crew
Food
Boarding
Entertainment
Overall
Reviews
William Drew,Nov 2025
SJC - HNL
Comfort
Crew
Food
Boarding
Entertainment
Overall
Reviews
William Drew,Nov 2025
SJC - HNL
Related info for your journey
Find useful and relevant information for your journey from Ontario to USA. 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 Ontario to USA
See prices for flight routes from nearby airports that may be better suited for you.
Top 8 airlines flying from Ontario to USA
Discover the top 8 airlines that operate flights from Ontario to USA. 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 enero 20, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$24 | Average$150 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$30 | Average$183 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$58 | Average$383 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$67 | Average$269 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$97 | Average$367 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$155 | Average$329 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$178 | Average$375 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$190 | Average$423 | FlexibilityNo cancel fee | On-time71% |