Cheap flights from Ontario (ONT) from $75

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Fly to

Route

Depart

Return

Price

Cheapest one-way

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Tue 8/18

6:00 am-9:26 am

Nonstop2h 26m

$26

Quickest one-way

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Tue 7/14

6:00 am-9:24 am

Nonstop2h 24m

$27

OntarioChicago

ONT - ORD

ONTORD

Ontario

Tue 7/7

1:50 pm-12:59 am

1 stop9h 09m

$115

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Mon 6/8

6:35 pm-12:05 am

1 stop5h 30m

$119

OntarioNew York

ONT - JFK

ONTJFK

Ontario

Mon 6/8

11:59 pm-1:48 pm

2 stops10h 49m

$134

OntarioNew York

ONT - LGA

ONTLGA

Ontario

Tue 6/9

11:59 pm-10:30 am

1 stop7h 31m

$149

OntarioNew York

ONT - LGA

ONTLGA

Ontario

Sat 8/1

5:45 am-7:04 pm

1 stop10h 19m

$154

OntarioNewark

ONT - EWR

ONTEWR

Ontario

Wed 8/19

10:45 am-11:29 pm

1 stop9h 44m

$159

OntarioHonolulu

ONT - HNL

ONTHNL

Ontario

Tue 8/18

9:11 am-12:09 pm

Nonstop5h 58m

$161

OntarioNew York

ONT - LGA

ONTLGA

Ontario

Fri 5/29

11:35 am-10:15 pm

1 stop7h 40m

$164

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

Where can I directly fly to from Ontario?

Currently, 12 destinations can be reached directly via flights from Ontario.

Flights from Ontario to

Atlanta

from$128

Flights from Ontario to

Austin

from$205

Flights from Ontario to

Boise

from$108

Flights from Ontario to

Honolulu

from$182

Flights from Ontario to

Las Vegas

from$30

Flights from Ontario to

León, Guanajuato

from$134

Flights from Ontario to

Morelia

from$165

Flights from Ontario to

San Francisco

from$49

Flights from Ontario to

San Jose, California

from$149

Flights from Ontario to

San José del Cabo

from$100

Flights from Ontario to

Santa Rosa

from$78

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.

6:00 am - 9:26 am

ONT

DEN

2h 26mnonstop

$26Frontier

Tue, Aug 18

6:00 am - 9:24 am

ONT

DEN

2h 24mnonstop

$27Frontier

Tue, Jul 14

1:50 pm - 12:59 am

ONT

ORD

9h 09m

1 stop

$115United Airlines

Tue, Jul 7

6:35 pm - 12:05 am

ONT

SEA

5h 30m

1 stop

$119Southwest

Mon, Jun 8

11:59 pm - 1:48 pm

ONT

JFK

10h 49m

2 stops

$134American Airlines

Mon, Jun 8

11:59 pm - 10:30 am

ONT

LGA

7h 31m

1 stop

$149American Airlines

Tue, Jun 9

5:45 am - 7:04 pm

ONT

LGA

10h 19m

1 stop

$154United Airlines

Sat, Aug 1

10:45 am - 11:29 pm

ONT

EWR

9h 44m

1 stop

$159Alaska Airlines

Wed, Aug 19

9:11 am - 12:09 pm

ONT

HNL

5h 58mnonstop

$161Alaska Airlines

Tue, Aug 18

11:35 am - 10:15 pm

ONT

LGA

7h 40m

1 stop

$164Southwest

Fri, May 29

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, San Jose, California, Phoenix, Honolulu and Chicago.

What are the cheapest cities to fly to from Ontario?

The cheapest city to fly to from Ontario currently is Las Vegas at $30. The next cheapest destinations are San Francisco, Houston, Santa Rosa, Denver and Phoenix.

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 JetBlue, Frontier, and Alaska Airlines. For example, JetBlue flights from Ontario to Las Vegas, start at $27, Frontier flights from Ontario to San Jose, California cost around $29, and Alaska Airlines flights from Ontario to San Francisco are around $41.

What is the cheapest flight available from Ontario?

Currently, the cheapest flight from Ontario found by our users is for $30 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 $202 to travel from Ontario to Las Vegas.

Which destinations have the most frequent flights from Ontario?

Seattle, Atlanta and Dallas/Fort Worth Airport are currently the destinations served most frequently from Ontario, with 15, 9 and 8 flights per day on average, respectively.

Which airlines can you fly with from Ontario?

Airlines including American Airlines, Alaska 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 Phoenix Sky Harbor Intl Airport, 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 May 2026, there are 33 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.