Cheap flights from Ontario (ONT) from $78

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Fly to

Route

Depart

Return

Price

OntarioHouston

ONT - IAH

ONTIAH

Ontario

Thu 5/7

8:26 am-1:46 pm

Nonstop3h 20m

$53

OntarioHouston

ONT - IAH

ONTIAH

Ontario

Sun 5/17

8:26 am-1:46 pm

Nonstop3h 20m

$54

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Tue 3/24

2:23 pm-8:18 pm

1 stop5h 55m

$58

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Wed 4/15

12:19 pm-1:40 pm

Nonstop1h 21m

$59

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Wed 5/20

4:30 pm-10:25 pm

1 stop5h 55m

$69

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Wed 5/13

10:55 am-4:40 pm

1 stop5h 45m

$76

OntarioHouston

ONT - HOU

ONTHOU

Ontario

Sat 4/25

12:49 pm-11:07 pm

1 stop8h 18m

$119

OntarioNew York

ONT - JFK

ONTJFK

Ontario

Tue 3/31

11:58 pm-11:31 am

1 stop8h 33m

$129

OntarioHonolulu

ONT - HNL

ONTHNL

Ontario

Wed 4/15

11:05 am-4:30 pm

1 stop8h 25m

$139

OntarioHonolulu

ONT - HNL

ONTHNL

Ontario

Wed 4/15

11:05 am-7:49 pm

2 stops11h 44m

$145

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

Where can I directly fly to from Ontario?

Currently, 15 destinations can be reached directly via flights from Ontario.

Flights from Ontario to

Austin

from$193

Flights from Ontario to

Boise

from$137

Flights from Ontario to

Denver

from$78

Flights from Ontario to

Honolulu

from$140

Flights from Ontario to

Las Vegas

from$28

Flights from Ontario to

León, Guanajuato

from$58

Flights from Ontario to

Morelia

from$39

Flights from Ontario to

Oakland, California

from$129

Flights from Ontario to

Portland

from$118

Flights from Ontario to

Sacramento

from$96

Flights from Ontario to

Salt Lake City

from$85

Flights from Ontario to

San Francisco

from$84

Flights from Ontario to

San José del Cabo

from$41

Flights from Ontario to

San Salvador

from$130

Flights from Ontario to

Seattle

from$98

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.

8:26 am - 1:46 pm

ONT

IAH

3h 20mnonstop

$53Frontier

Thu, May 7

8:26 am - 1:46 pm

ONT

IAH

3h 20mnonstop

$54Frontier

Sun, May 17

2:23 pm - 8:18 pm

ONT

PHX

5h 55m

1 stop

$58Frontier

Tue, Mar 24

12:19 pm - 1:40 pm

ONT

PHX

1h 21mnonstop

$59American Airlines

Wed, Apr 15

4:30 pm - 10:25 pm

ONT

PHX

5h 55m

1 stop

$69Southwest

Wed, May 20

10:55 am - 4:40 pm

ONT

SFO

5h 45m

1 stop

$76Southwest

Wed, May 13

12:49 pm - 11:07 pm

ONT

HOU

8h 18m

1 stop

$119Delta

Sat, Apr 25

11:58 pm - 11:31 am

ONT

JFK

8h 33m

1 stop

$129American Airlines

Tue, Mar 31

11:05 am - 4:30 pm

ONT

HNL

8h 25m

1 stop

$139United Airlines

Wed, Apr 15

11:05 am - 7:49 pm

ONT

HNL

11h 44m

2 stops

$145United Airlines

Wed, Apr 15

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?

According to searches, the most popular destinations for domestic flights from Ontario among momondo users are Salt Lake City, Denver, Honolulu, Chicago and Phoenix.

What are the cheapest cities to fly to from Ontario?

The cheapest city to fly to from Ontario currently is Las Vegas at $28. The next cheapest destinations are Morelia, Houston, San José del Cabo, León and Dallas.

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 $34, and American Airlines flights from Ontario to New Orleans are around $54.

What is the cheapest flight available from Ontario?

Currently, the cheapest flight from Ontario found by our users is for $28 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 $148 to travel from Ontario to Las Vegas.

Which destinations have the most frequent flights from Ontario?

Dallas/Fort Worth Airport, Seattle and Phoenix Sky Harbor Intl Airport are currently the destinations served most frequently from Ontario, with 16, 14 and 12 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 Seattle, for which the starting price of a first class seat can be as low as $477.

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 February 2026, there are 29 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.