Cheap flights from Ontario (ONT) from $78

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Fly to

Route

Depart

Return

Price

OntarioHouston

ONT - IAH

ONTIAH

Ontario

Thu 4/16

8:26 am-1:46 pm

Nonstop3h 20m

$53

OntarioHouston

ONT - IAH

ONTIAH

Ontario

Tue 4/21

12:59 am-3:07 pm

1 stop12h 08m

$54

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Wed 4/1

11:05 am-12:34 pm

Nonstop1h 29m

$86

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Sat 4/4

1:27 pm-8:57 pm

1 stop7h 30m

$89

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Sun 3/1

8:00 am-5:45 pm

1 stop9h 45m

$94

OntarioHouston

ONT - HOU

ONTHOU

Ontario

Sat 4/25

10:15 pm-9:51 am

1 stop9h 36m

$119

OntarioHonolulu

ONT - HNL

ONTHNL

Ontario

Thu 2/26

12:18 pm-7:15 pm

1 stop8h 57m

$148

OntarioHonolulu

ONT - HNL

ONTHNL

Ontario

Tue 4/7

6:00 am-8:53 pm

2 stops17h 53m

$154

OntarioHouston

ONT - HOU

ONTHOU

Ontario

Tue 4/28

12:55 pm-5:55 pm

Nonstop3h 00m

$159

OntarioHouston

ONT - HOU

ONTHOU

Ontario

Sat 4/18

12:19 pm-11:47 pm

2 stops9h 28m

$164

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

Where can I directly fly to from Ontario?

Currently, 17 destinations can be reached directly via flights from Ontario.

Flights from Ontario to

Atlanta

from$148

Flights from Ontario to

Austin

from$173

Flights from Ontario to

Baltimore

from$201

Flights from Ontario to

Boise

from$137

Flights from Ontario to

Denver

from$64

Flights from Ontario to

Honolulu

from$148

Flights from Ontario to

Las Vegas

from$29

Flights from Ontario to

León, Guanajuato

from$61

Flights from Ontario to

Morelia

from$39

Flights from Ontario to

Nashville

from$228

Flights from Ontario to

Sacramento

from$121

Flights from Ontario to

San Francisco

from$75

Flights from Ontario to

San Jose, California

from$107

Flights from Ontario to

San José del Cabo

from$42

Flights from Ontario to

San Salvador

from$130

Flights from Ontario to

Santa Rosa

from$137

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, Apr 16

12:59 am - 3:07 pm

ONT

IAH

12h 08m

1 stop

$54Frontier

Tue, Apr 21

11:05 am - 12:34 pm

ONT

SFO

1h 29mnonstop

$86United Airlines

Wed, Apr 1

1:27 pm - 8:57 pm

ONT

SEA

7h 30m

1 stop

$89United Airlines

Sat, Apr 4

8:00 am - 5:45 pm

ONT

SEA

9h 45m

1 stop

$94Southwest

Sun, Mar 1

10:15 pm - 9:51 am

ONT

HOU

9h 36m

1 stop

$119Delta

Sat, Apr 25

12:18 pm - 7:15 pm

ONT

HNL

8h 57m

1 stop

$148American Airlines

Thu, Feb 26

6:00 am - 8:53 pm

ONT

HNL

17h 53m

2 stops

$154Delta

Tue, Apr 7

12:55 pm - 5:55 pm

ONT

HOU

3h 00mnonstop

$159Southwest

Tue, Apr 28

12:19 pm - 11:47 pm

ONT

HOU

9h 28m

2 stops

$164American Airlines

Sat, Apr 18

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 Denver, Salt Lake City, San Jose, California, Phoenix and Honolulu.

What are the cheapest cities to fly to from Ontario?

The cheapest city to fly to from Ontario currently is Las Vegas at $29. The next cheapest destinations are Morelia, San José del Cabo, Dallas, León and Denver.

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 $32, 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 $34 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 $168 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 12, 10 and 9 flights per day on average, respectively.

Which airlines can you fly with from Ontario?

Airlines including American Airlines, United Airlines and Delta 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 February 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.