Cheap flights from Ontario (ONT) from $75

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Fly to

Route

Depart

Return

Price

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Thu 11/27

9:59 pm-11:29 pm

Nonstop1h 30m

$42

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Sun 12/14

10:12 pm-11:52 pm

Nonstop1h 40m

$43

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Fri 12/19

10:12 pm-11:52 pm

Nonstop1h 40m

$49

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Sat 12/13

10:45 am-4:50 pm

1 stop6h 05m

$76

OntarioHouston

ONT - HOU

ONTHOU

Ontario

Mon 12/15

8:55 am-5:45 pm

1 stop6h 50m

$77

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Wed 12/10

6:00 am-8:57 am

Nonstop2h 57m

$77

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Tue 2/10

7:30 am-10:36 am

Nonstop3h 06m

$80

OntarioHouston

ONT - HOU

ONTHOU

Ontario

Tue 12/16

6:00 am-3:53 pm

1 stop7h 53m

$94

OntarioHouston

ONT - HOU

ONTHOU

Ontario

Wed 12/10

10:25 pm-9:34 am

1 stop9h 09m

$109

OntarioHouston

ONT - HOU

ONTHOU

Ontario

Sat 1/17

6:00 am-10:46 pm

1 stop14h 46m

$128

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

Where can I directly fly to from Ontario?

Currently, 9 destinations can be reached directly via flights from Ontario.

Flights from Ontario to

Boise

from$171

Flights from Ontario to

Las Vegas

from$35

Flights from Ontario to

León, Guanajuato

from$55

Flights from Ontario to

Morelia

from$43

Flights from Ontario to

Portland

from$57

Flights from Ontario to

Sacramento

from$100

Flights from Ontario to

San Francisco

from$38

Flights from Ontario to

San Jose, California

from$78

Flights from Ontario to

San José del Cabo

from$41

Find the cheapest flights from Ontario

One-way

Last minute

International

Domestic

Cheap one-way flights from Ontario

Enter your travel dates to find the best prices.

9:59 pm - 11:29 pmONT-SFO

1h 30mnonstop

$42Frontier

Find Deal

Thu, Nov 27

10:12 pm - 11:52 pmONT-SFO

1h 40mnonstop

$43Frontier

Find Deal

Sun, Dec 14

10:12 pm - 11:52 pmONT-SFO

1h 40mnonstop

$49Frontier

Find Deal

Fri, Dec 19

10:45 am - 4:50 pmONT-SEA

6h 05m1 stop

$76Southwest

Find Deal

Sat, Dec 13

8:55 am - 5:45 pmONT-HOU

6h 50m1 stop

$77Southwest

Find Deal

Mon, Dec 15

6:00 am - 8:57 amONT-SEA

2h 57mnonstop

$77Alaska Airlines

Find Deal

Wed, Dec 10

7:30 am - 10:36 amONT-SEA

3h 06mnonstop

$80Delta

Find Deal

Tue, Feb 10

6:00 am - 3:53 pmONT-HOU

7h 53m1 stop

$94American Airlines

Find Deal

Tue, Dec 16

10:25 pm - 9:34 amONT-HOU

9h 09m1 stop

$109Delta

Find Deal

Wed, Dec 10

6:00 am - 10:46 pmONT-HOU

14h 46m1 stop

$128American Airlines

Find Deal

Sat, Jan 17

Flights from Ontario - Travel Insights & Trends

Get data-powered insights and trends into flights from Ontario to help you craft the best travel plan.

Prices

Other information

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 Honolulu the most.

What are the cheapest cities to fly to from Ontario?

The cheapest city to fly to from Ontario currently is Las Vegas at $35. The next cheapest destinations are San Francisco, San José del Cabo, Morelia, León and Portland.

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 Las Vegas, start at $24, Alaska Airlines flights from Ontario to San Francisco cost around $36, and American Airlines flights from Ontario to Newark Airport are around $48.

What is the cheapest flight available from Ontario?

Currently, the cheapest flight from Ontario found by our users is for $35 to Las Vegas. Prices will vary according to several factors such as the departure date and time, but on average you can expect to pay around $150 to travel from Ontario to Las Vegas.

Which destinations have the most frequent flights from Ontario?

Seattle, Dallas/Fort Worth Airport and Atlanta are currently the destinations served most frequently from Ontario, with 13, 13 and 12 flights per day on average, respectively.

Which airlines can you fly with from Ontario?

Airlines including American Airlines, China Airlines and United 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 Seattle, for which the starting price of a first class seat can be as low as $389.

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 November 2025, there are 31 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.