Cheap flights from Ontario (ONT) from $62

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Fly to

Route

Depart

Return

Price

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Wed 4/1

4:52 pm-6:02 pm

Nonstop1h 10m

$29

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Wed 3/18

10:03 pm-11:14 pm

Nonstop1h 11m

$30

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Wed 3/25

10:03 pm-11:14 pm

Nonstop1h 11m

$34

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Tue 3/31

7:05 am-12:45 pm

1 stop5h 40m

$76

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Mon 4/20

5:15 am-6:30 am

Nonstop1h 15m

$79

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Wed 3/11

12:22 pm-8:28 pm

1 stop8h 06m

$98

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Tue 3/24

6:00 am-8:55 am

Nonstop2h 55m

$99

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Wed 3/11

6:00 am-8:54 am

Nonstop2h 54m

$102

OntarioHonolulu

ONT - HNL

ONTHNL

Ontario

Mon 5/4

10:37 am-7:49 pm

2 stops12h 12m

$144

OntarioHonolulu

ONT - HNL

ONTHNL

Ontario

Sat 4/25

1:27 pm-7:20 pm

1 stop8h 53m

$149

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

Where can I directly fly to from Ontario?

Currently, 14 destinations can be reached directly via flights from Ontario.

Flights from Ontario to

Austin

from$179

Flights from Ontario to

Boise

from$137

Flights from Ontario to

Denver

from$84

Flights from Ontario to

Honolulu

from$140

Flights from Ontario to

Las Vegas

from$28

Flights from Ontario to

León, Guanajuato

from$57

Flights from Ontario to

Morelia

from$37

Flights from Ontario to

Oakland, California

from$118

Flights from Ontario to

Portland

from$118

Flights from Ontario to

San Francisco

from$75

Flights from Ontario to

San José del Cabo

from$41

Flights from Ontario to

San Salvador

from$130

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.

4:52 pm - 6:02 pm

ONT

LAS

1h 10mnonstop

$29Frontier

Wed, Apr 1

10:03 pm - 11:14 pm

ONT

LAS

1h 11mnonstop

$30Frontier

Wed, Mar 18

10:03 pm - 11:14 pm

ONT

LAS

1h 11mnonstop

$34Frontier

Wed, Mar 25

7:05 am - 12:45 pm

ONT

SFO

5h 40m

1 stop

$76Southwest

Tue, Mar 31

5:15 am - 6:30 am

ONT

PHX

1h 15mnonstop

$79Southwest

Mon, Apr 20

12:22 pm - 8:28 pm

ONT

SEA

8h 06m

1 stop

$98American Airlines

Wed, Mar 11

6:00 am - 8:55 am

ONT

SEA

2h 55mnonstop

$99Delta

Tue, Mar 24

6:00 am - 8:54 am

ONT

SEA

2h 54mnonstop

$102Delta

Wed, Mar 11

10:37 am - 7:49 pm

ONT

HNL

12h 12m

2 stops

$144United Airlines

Mon, May 4

1:27 pm - 7:20 pm

ONT

HNL

8h 53m

1 stop

$149United Airlines

Sat, Apr 25

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, Phoenix, Honolulu and San Francisco.

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 $35, 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 Atlanta are currently the destinations served most frequently from Ontario, with 16, 13 and 9 flights per day on average, respectively.

Which airlines can you fly with from Ontario?

Airlines including American Airlines, China Airlines and Alaska 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 $464.

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 March 2026, there are 30 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.