Cheap flights from Ontario from $33
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 12/10. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Fly to
Route
Depart
Return
OntarioDenver
ONT Ontario - DEN Denver Intl
ONTDEN
Ontario
Thu 12/10
6:00 am-9:24 am
Nonstop2h 24m
OntarioDenver
ONT Ontario - DEN Denver Intl
ONTDEN
Ontario
Wed 11/11
11:52 am-3:13 pm
Nonstop2h 21m
OntarioSan Francisco
ONT Ontario - SFO San Francisco
ONTSFO
Ontario
Sat 11/7
4:17 pm-5:50 pm
Nonstop1h 33m
OntarioSan Francisco
ONT Ontario - SFO San Francisco
ONTSFO
Ontario
Sat 12/12
11:20 am-12:50 pm
Nonstop1h 30m
OntarioSan Francisco
ONT Ontario - SFO San Francisco
ONTSFO
Ontario
Sat 12/5
1:25 pm-5:20 pm
1 stop3h 55m
OntarioSan Francisco
ONT Ontario - SFO San Francisco
ONTSFO
Ontario
Wed 12/9
8:40 am-1:25 pm
1 stop4h 45m
OntarioSeattle
ONT Ontario - SEA Seattle/Tacoma Intl
ONTSEA
Ontario
Tue 12/15
6:00 am-8:57 am
Nonstop2h 57m
OntarioSeattle
ONT Ontario - SEA Seattle/Tacoma Intl
ONTSEA
Ontario
Fri 10/30
6:56 pm-9:39 pm
Nonstop2h 43m
OntarioSeattle
ONT Ontario - SEA Seattle/Tacoma Intl
ONTSEA
Ontario
Wed 11/11
7:00 am-10:01 am
Nonstop3h 01m
OntarioSeattle
ONT Ontario - SEA Seattle/Tacoma Intl
ONTSEA
Ontario
Mon 11/9
5:56 pm-8:57 pm
Nonstop3h 01m
Where can I directly fly to from Ontario?
Currently, 17 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?
According to searches, the most popular destinations for domestic flights from Ontario among momondo users are San Jose, California, Chicago, Salt Lake City, Denver and Phoenix.
What are the most popular places to fly to from Ontario?
According to momondo flight searches, the top destination from Ontario is Honolulu, capturing 22% of all searches. Following closely are New York with 14% and San Francisco with 8%. Additionally, flights from Ontario heading to Dallas make up 6% of searches, followed by Houston 5%, and Chicago 4%.
What are the most popular international flights out of Ontario?
There are many places you can fly to from Ontario. The most popular international destinations according to searches among momondo users are flights to Tokyo, flights to Mexico City and flights to Taipei City.
What is the shortest direct flight from Ontario?
The quickest direct flight available from Ontario lands in Las Vegas, taking just 1h 06m to reach. The second quickest flight is to San Jose, with a flight time of 1h 20m, followed by Oakland at 1h 20m.
What is the longest direct flight from Ontario?
From Ontario, the longest direct flight is to Taipei City, with a flight time of 14h 05m. The next longest flight is to Honolulu, which takes 6h, followed by New York at 5h 18m.
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 JetBlue. For example, Frontier flights from Ontario to San Jose, California, start at $29, Alaska Airlines flights from Ontario to San Francisco cost around $51, and JetBlue flights from Ontario to Las Vegas are around $57.
What is the cheapest flight available from Ontario?
Currently, the cheapest flight from Ontario found by our users is for $31 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 $213 to travel from Ontario to San Francisco.
Which destinations have the most frequent flights from Ontario?
Dallas/Fort Worth Airport, Seattle and Atlanta are currently the destinations served most frequently from Ontario, with 21, 15 and 13 flights per day on average, respectively.
Which airlines can you fly with from Ontario?
Airlines including American Airlines, United Airlines and Alaska 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 Atlanta, for which the starting price of a first class seat can be as low as $478.
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 October 2026, there are 28 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.