Cheap flights from Ontario (ONT) from $77

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Fly to

Route

Depart

Return

Price

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Sat 2/28

6:15 am-8:38 am

Nonstop1h 23m

$46

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Sat 3/7

6:15 am-3:01 pm

1 stop7h 46m

$54

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Mon 3/9

9:40 pm-3:56 am

1 stop5h 16m

$58

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Wed 4/1

6:15 am-7:30 am

Nonstop1h 15m

$59

OntarioNewark

ONT - EWR

ONTEWR

Ontario

Tue 3/3

8:40 am-11:29 pm

2 stops35h 49m

$84

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Wed 4/1

4:22 pm-8:58 pm

1 stop4h 36m

$89

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Wed 4/1

5:53 pm-8:50 pm

Nonstop2h 57m

$99

OntarioHonolulu

ONT - HNL

ONTHNL

Ontario

Tue 2/24

8:41 am-12:45 pm

Nonstop6h 04m

$139

OntarioHonolulu

ONT - HNL

ONTHNL

Ontario

Mon 4/27

2:20 pm-9:20 pm

1 stop10h 00m

$158

OntarioHouston

ONT - HOU

ONTHOU

Ontario

Tue 3/10

1:20 pm-6:15 pm

Nonstop2h 55m

$167

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

Where can I directly fly to from Ontario?

Currently, 16 destinations can be reached directly via flights from Ontario.

Flights from Ontario to

Atlanta

from$152

Flights from Ontario to

Austin

from$161

Flights from Ontario to

Baltimore

from$201

Flights from Ontario to

Boise

from$117

Flights from Ontario to

Denver

from$62

Flights from Ontario to

Honolulu

from$148

Flights from Ontario to

Las Vegas

from$34

Flights from Ontario to

León, Guanajuato

from$64

Flights from Ontario to

Morelia

from$40

Flights from Ontario to

Sacramento

from$130

Flights from Ontario to

San Francisco

from$76

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$115

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.

6:15 am - 8:38 am

ONT

PHX

1h 23mnonstop

$46American Airlines

Sat, Feb 28

6:15 am - 3:01 pm

ONT

PHX

7h 46m

1 stop

$54Frontier

Sat, Mar 7

9:40 pm - 3:56 am

ONT

DEN

5h 16m

1 stop

$58Frontier

Mon, Mar 9

6:15 am - 7:30 am

ONT

PHX

1h 15mnonstop

$59Southwest

Wed, Apr 1

8:40 am - 11:29 pm

ONT

EWR

35h 49m

2 stops

$84Multiple Airlines

Tue, Mar 3

4:22 pm - 8:58 pm

ONT

SEA

4h 36m

1 stop

$89Alaska Airlines

Wed, Apr 1

5:53 pm - 8:50 pm

ONT

SEA

2h 57mnonstop

$99Delta

Wed, Apr 1

8:41 am - 12:45 pm

ONT

HNL

6h 04mnonstop

$139Alaska Airlines

Tue, Feb 24

2:20 pm - 9:20 pm

ONT

HNL

10h 00m

1 stop

$158Delta

Mon, Apr 27

1:20 pm - 6:15 pm

ONT

HOU

2h 55mnonstop

$167Southwest

Tue, Mar 10

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 San Jose, California, Denver, Honolulu, New York 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 $34. The next cheapest destinations are Morelia, San José del Cabo, Dallas, Houston 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 $31, 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 13, 11 and 10 flights per day on average, respectively.

Which airlines can you fly with from Ontario?

Airlines including American Airlines, Delta 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 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.