Cheap flights from Ontario (ONT) from $53

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Fly to

Route

Depart

Return

Price

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Tue 2/24

8:30 am-9:36 am

Nonstop1h 06m

$29

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Thu 12/4

6:15 am-7:22 am

Nonstop1h 07m

$30

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Tue 12/16

6:41 pm-8:05 pm

Nonstop1h 24m

$39

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Wed 12/10

7:55 am-1:40 pm

1 stop5h 45m

$69

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Wed 12/3

1:50 pm-3:14 pm

Nonstop1h 24m

$69

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Tue 12/9

11:10 am-4:05 pm

2 stops4h 55m

$74

OntarioDallas

ONT - DFW

ONTDFW

Ontario

Thu 12/25

10:50 am-3:53 pm

Nonstop3h 03m

$80

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Tue 3/3

6:15 am-11:27 am

1 stop4h 12m

$89

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Thu 12/18

6:00 am-12:57 pm

1 stop6h 57m

$90

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Sat 12/6

6:40 am-11:32 am

1 stop27h 52m

$108

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

Where can I directly fly to from Ontario?

Currently, 9 destinations can be reached directly via flights from Ontario.

Flights from Ontario to

Boise

from$171

Flights from Ontario to

Las Vegas

from$35

Flights from Ontario to

León, Guanajuato

from$55

Flights from Ontario to

Morelia

from$43

Flights from Ontario to

Portland

from$57

Flights from Ontario to

Sacramento

from$100

Flights from Ontario to

San Francisco

from$38

Flights from Ontario to

San Jose, California

from$78

Flights from Ontario to

San José del Cabo

from$41

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.

8:30 am - 9:36 amONT-LAS

1h 06mnonstop

$29Frontier

Find Deal

Tue, Feb 24

6:15 am - 7:22 amONT-LAS

1h 07mnonstop

$30Frontier

Find Deal

Thu, Dec 4

6:41 pm - 8:05 pmONT-SFO

1h 24mnonstop

$39United Airlines

Find Deal

Tue, Dec 16

7:55 am - 1:40 pmONT-LAS

5h 45m1 stop

$69Southwest

Find Deal

Wed, Dec 10

1:50 pm - 3:14 pmONT-SFO

1h 24mnonstop

$69United Airlines

Find Deal

Wed, Dec 3

11:10 am - 4:05 pmONT-LAS

4h 55m2 stops

$74Southwest

Find Deal

Tue, Dec 9

10:50 am - 3:53 pmONT-DFW

3h 03mnonstop

$80American Airlines

Find Deal

Thu, Dec 25

6:15 am - 11:27 amONT-DEN

4h 12m1 stop

$89American Airlines

Find Deal

Tue, Mar 3

6:00 am - 12:57 pmONT-SEA

6h 57m1 stop

$90Delta

Find Deal

Thu, Dec 18

6:40 am - 11:32 amONT-DEN

27h 52m1 stop

$108Delta

Find Deal

Sat, Dec 6

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?

From Ontario, you can take domestic flights to many cities. Searches reveal that momondo users prefer flights to Portland, Denver, Phoenix, Salt Lake City, and Honolulu the most.

What are the cheapest cities to fly to from Ontario?

The cheapest city to fly to from Ontario currently is Las Vegas at $35. The next cheapest destinations are San Francisco, San José del Cabo, Morelia, León and Portland.

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 $36, 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 $35 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 $150 to travel from Ontario to Las Vegas.

Which destinations have the most frequent flights from Ontario?

Dallas/Fort Worth Airport, Phoenix Sky Harbor Intl Airport and Seattle are currently the destinations served most frequently from Ontario, with 15, 10 and 9 flights per day on average, respectively.

Which airlines can you fly with from Ontario?

Airlines including American Airlines, China Airlines 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 November 2025, there are 31 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.