Cheap flights from Ontario (ONT) to the United States from $40
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 5/7. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
How far in advance should I book a flight from Ontario to USA?
When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 45 days in advance, which can save you up to 76% on flights from Ontario to USA compared to booking the week you need them. Waiting 45 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $378. For sooner than that we have options available in the next 3 days from $537.
What is the cheapest month to fly from Ontario to USA?
January can be a great time to fly to USA from Ontario with a flight ticket averaging about $338. Cheapflights users have found deals in the month of January for as cheap as $122. The most expensive prices can be found in the month of December.
When is the cheapest time to fly from Ontario to USA (ONT - US)?
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to USA as you normally would.
Cheap Frontier flights from Ontario to USA
Explore cheap flight options specifically provided by Frontier for the route between Ontario and USA. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 3,086,534 searches. Data last updated April 24, 2024.
Take a peek at the cheapest Frontier flights we've detected traveling from Ontario to USA. Come back soon if you're not finding the exact deal you're looking for.
Cheap Southwest flights from Ontario to USA
Explore cheap flight options specifically provided by Southwest for the route between Ontario and USA. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 3,086,534 searches. Data last updated April 24, 2024.
Some of the best deals we've found on Southwest flights traveling from Ontario to USA. If these deals don't fit your criteria, make sure to check back soon as new deals are always added.
Cheap Ontario to USA flights in April & May 2024
Find cheap flight options from Ontario to USA specifically for the months of April and May 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 3,086,534 searches. Prices were last updated on April 24, 2024.
The lowest fares we've come across on flights traveling from Ontario to USA in April and May 2024. More deals are always being added, so be sure to check back regularly.
Ontario to USA 2024 flight deals
Discover exclusive flight deals for travel between Ontario and USA in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 3,086,534 searches. Data last updated April 24, 2024.
The lowest fares we've come across on flights traveling from Ontario to USA in April and May 2024. More deals are always being added, so be sure to check back regularly.
Non-stop flights to USA from Ontario
Discover non-stop flight options from Ontario to USA. Find direct flights with no layovers, providing a convenient travel experience. Explore non-stop flight options based on user searches, and compare prices and availability for your desired travel dates. Over the last 7 days, Cheapflights users made 3,086,534 searches. Data last updated April 24, 2024.
Take a look at some of the direct flights traveling from Ontario to USA in the near future. Search for alternative flights from Ontario to USA by utilizing the search form above.
Ontario to USA flights leaving soon
Find last-minute flight options from Ontario to USA for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 3,086,534 searches. Data last updated April 24, 2024.
Have a look at some of the flights available from Ontario to USA departing last-minute. Tip: verify your flight details before completing your reservation.
One-way flights to USA from Ontario
Search for one-way flight options from Ontario to USA. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 3,086,534 searches. Data last updated April 24, 2024.
Take a look at some of the one-way flights we've detected from Ontario to USA. Users can also find round-trip Ontario to USA flights by using the search form above.
Find flights from Ontario to USA within your budget
Customize your flight search to find flights from Ontario to USA 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 3,086,534 searches. Data last updated April 24, 2024.
Fly from
Fly to
Budget
$43 - $177
Route
Depart
Return
Price
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Wed 5/15
Nonstop1h 27m
San Francisco
Tue 5/21
Nonstop1h 24m
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Sat 5/18
Nonstop1h 28m
San Francisco
Tue 6/25
Nonstop1h 24m
OntarioPhoenix Sky Harbor Intl
ONT - PHX
ONTPHX
Ontario
Tue 5/7
Nonstop1h 20m
Phoenix Sky Harbor Intl
Tue 5/14
Nonstop1h 16m
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Sat 5/4
Nonstop1h 28m
San Francisco
Tue 5/7
Nonstop1h 29m
OntarioPhoenix Sky Harbor Intl
ONT - PHX
ONTPHX
Ontario
Sat 9/14
Nonstop1h 28m
Phoenix Sky Harbor Intl
Wed 9/18
Nonstop1h 13m
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Sat 6/8
Nonstop1h 28m
San Francisco
Wed 6/12
Nonstop1h 24m
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Tue 5/14
Nonstop1h 27m
San Francisco
Wed 5/15
Nonstop1h 29m
OntarioSeattle/Tacoma Intl
ONT - SEA
ONTSEA
Ontario
Thu 6/6
Nonstop2h 53m
Seattle/Tacoma Intl
Mon 6/10
Nonstop2h 32m
OntarioSeattle/Tacoma Intl
ONT - SEA
ONTSEA
Ontario
Tue 5/14
Nonstop2h 45m
Seattle/Tacoma Intl
Tue 5/21
Nonstop2h 32m
No data available for this route at this time. Please check back soon.
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 April 24, 2024.
Peruse reviews from past customers who have flown with Frontier, Southwest and United Airlines from Ontario to USA to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Comfort
Food
Entertainment
Crew
Boarding
Overall
Reviews
I was traveling with a companion that utilizes a scooter to get around. We have flown together many times and used other airlines. Southwest by far is the most accommodating airline in the fleet your staff Makes the accessibility easy and convenient for for this type of travel. We would personally like to think the flight teams of our two flights for being very accommodating and helpful throughout our trip.
Comfort
Food
Entertainment
Crew
Boarding
Overall
Reviews
I was traveling with a companion that utilizes a scooter to get around. We have flown together many times and used other airlines. Southwest by far is the most accommodating airline in the fleet your staff Makes the accessibility easy and convenient for for this type of travel. We would personally like to think the flight teams of our two flights for being very accommodating and helpful throughout our trip.
Comfort
Food
Entertainment
Crew
Boarding
Overall
Reviews
I was traveling with a companion that utilizes a scooter to get around. We have flown together many times and used other airlines. Southwest by far is the most accommodating airline in the fleet your staff Makes the accessibility easy and convenient for for this type of travel. We would personally like to think the flight teams of our two flights for being very accommodating and helpful throughout our trip.
Comfort
Food
Entertainment
Crew
Boarding
Overall
Reviews
I was traveling with a companion that utilizes a scooter to get around. We have flown together many times and used other airlines. Southwest by far is the most accommodating airline in the fleet your staff Makes the accessibility easy and convenient for for this type of travel. We would personally like to think the flight teams of our two flights for being very accommodating and helpful throughout our trip.
Comfort
Food
Entertainment
Crew
Boarding
Overall
Reviews
I was traveling with a companion that utilizes a scooter to get around. We have flown together many times and used other airlines. Southwest by far is the most accommodating airline in the fleet your staff Makes the accessibility easy and convenient for for this type of travel. We would personally like to think the flight teams of our two flights for being very accommodating and helpful throughout our trip.
Comfort
Food
Entertainment
Crew
Boarding
Overall
Reviews
I was traveling with a companion that utilizes a scooter to get around. We have flown together many times and used other airlines. Southwest by far is the most accommodating airline in the fleet your staff Makes the accessibility easy and convenient for for this type of travel. We would personally like to think the flight teams of our two flights for being very accommodating and helpful throughout our trip.
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 USASee prices for flight routes from nearby airports that may be better suited for you.
See prices for flight routes from nearby airports that may be better suited for you.
Top 9 airlines flying from Ontario to USA
Discover the top 9 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 3,086,534 searches. Data last updated April 24, 2024.
Search flights from Ontario to USA by cabin class
Find flights from Ontario to USA, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Hourly flight availability from Ontario to USA
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 April 24, 2024.
| 20%of flight departures | Early morningMidnight to 6 am |
|---|---|
| 48%of flight departures | Morning6 am to noon |
| 18%of flight departures | AfternoonNoon to 6 pm |
| 14%of flight departures | Evening6 pm to midnight |
Book a flight to one of these trending destinations
User searches for flights to these destinations increased 20% or more in the past 90 days compared to other destinations
Fly with Cheapflights
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How does Cheapflights help users find flights from Ontario to USA?
When you search for this flight from Ontario to USA, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.
Why should you use Cheapflights to find cheap flight tickets from Ontario to USA?
Millions of users choose and trust Cheapflights to book the best flight deals from Ontario to USA for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.
Can Cheapflights find flights from Ontario to USA with no change fees?
Certainly. Search results for flights to USA from Ontario shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.
Can Cheapflights notify me if prices for flights from Ontario to USA become cheaper?
Not ready to book yet? You can track prices for flights from Ontario to USA on Cheapflights with our Price Alert feature and get notified when better prices are available.