Cheap flights from Ontario from $29
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario departing on 7/30. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
Find, compare and book domestic and international flights departing from Ontario
Discover deals from 900+ travel sites with momondo.
Save money when you book flights with momondo
Big names and deals
Big names and deals
Search 100s of travel sites to compare prices.Filter for what you want
Filter for what you want
Free Wi-Fi? Stopover? Instantly customize your results.Trusted and free
Trusted and free
We’re completely free to use - no hidden charges or fees.Price Alerts
Price Alerts
Not ready to book? to track prices.Where can I directly fly to from Ontario?
Currently, 13 destinations can be reached directly via flights from Ontario.
Find the cheapest flights from Ontario
Cheap one-way flights from Ontario
Last-minute flight deals from Ontario
Cheapest international flights from Ontario
Cheapest domestic flights from Ontario
Flights from Ontario - Travel Insights & Trends
Get data-powered insights and trends into flights from Ontario to help you craft the best travel plan.
What are the most popular domestic flights out of Ontario?
From Ontario, you can take domestic flights to many cities. Searches reveal that momondo users prefer flights to Portland, Denver, Phoenix, Salt Lake City, and Chicago the most.
What are the most popular places to fly to from Ontario?
Based on momondo flight searches, the most popular place to fly from Ontario is Seattle (14% of total searches). The next most popular destinations are San Francisco (13%) and New York (7%). Searches for flights from Ontario to Houston (5%), to Honolulu (5%) and to Chicago (4%) are also popular.
What are the most popular international flights out of Ontario?
If you’re flying out of Ontario, there are many destinations to choose from. International flights to Vancouver, Tokyo, and Taipei City are the most popular, according to searches on momondo.
What is the shortest direct flight from Ontario?
From Ontario, the shortest direct flight is to San Jose, with a flight time of 1h 10m. The next fastest flight is to Las Vegas, which takes 1h 14m, followed by Phoenix at 1h 16m.
What is the longest direct flight from Ontario?
From Ontario, the longest direct flight is to Taipei City, with a flight time of 13h 30m. The next longest flight is to Honolulu, which takes 5h 55m, followed by New York at 5h 31m.
Frequently asked questions regarding flights from Ontario
Which airlines are currently offering the cheapest flights from Ontario?
Our data suggests that currently, the cheapest flights from Ontario are being offered by Frontier, Alaska Airlines, and American Airlines. For example, Frontier flights from Ontario to Stockton, start at $20, Alaska Airlines flights from Ontario to San Francisco cost around $23, and American Airlines flights from Ontario to Reno are around $31.
What is the cheapest flight available from Ontario?
Currently, the cheapest flight from Ontario found by our users is for $28 to San Francisco. Prices will vary according to several factors such as the departure date and time, but on average you can expect to pay around $1,499 to travel from Ontario to San Francisco.
Which destinations have the most frequent flights from Ontario?
Dallas/Fort Worth Airport, Seattle and San Francisco are currently the destinations served most frequently from Ontario, with 17, 16 and 8 flights per day on average, respectively.
Which airlines can you fly with from Ontario?
Airlines including American Airlines, Delta and China Airlines frequently fly from Ontario. You can view other airlines by performing a quick search in the form above.
What is the cheapest first class flight from Ontario?
If you are looking for a cheap first class flight, consider flights to Phoenix Sky Harbor Intl Airport, for which the starting price of a first class seat can be as low as $464.
When did momondo last update prices for flights from Ontario Airport?
Prices for flights from Ontario Airport refresh daily.
How many operators does momondo search for flights from Ontario Airport?
As of July 2025, there are 37 operators available to choose from for flights from Ontario Airport.
How old do you have to be to fly from Ontario Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Ontario Airport.
What documentation or ID do you need to fly to Ontario Airport?
The required travel and health documents for your Ontario Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Ontario Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.