Cheap flights from Ontario (ONT) from $89

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Fly to

Route

Depart

Return

Price

OntarioDenver

ONT - DEN

ONTDEN

Ontario

fr. 2/13

6:00 am-9:26 am

Nonstop2h 26m

$48

OntarioDenver

ONT - DEN

ONTDEN

Ontario

fr. 12/12

3:20 pm-6:40 pm

Nonstop2h 20m

$49

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

ti. 12/9

6:15 am-4:51 pm

1 stop10h 36m

$52

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

to. 1/29

4:03 pm-6:54 pm

Nonstop2h 51m

$79

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

fr. 1/30

3:30 pm-6:35 pm

Nonstop3h 05m

$80

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

fr. 1/16

1:46 pm-6:43 pm

1 stop4h 57m

$89

OntarioHouston

ONT - HOU

ONTHOU

Ontario

on. 2/25

1:15 pm-10:28 pm

1 stop7h 13m

$109

OntarioNew York

ONT - LGA

ONTLGA

Ontario

sø. 1/18

5:05 am-8:19 pm

2 stops12h 14m

$130

OntarioNew York

ONT - LGA

ONTLGA

Ontario

lø. 12/13

6:45 am-10:20 pm

1 stop12h 35m

$131

OntarioHouston

ONT - HOU

ONTHOU

Ontario

lø. 2/28

1:35 pm-6:35 pm

Nonstop3h 00m

$137

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

Austin

from$177

Flights from Ontario to

Boise

from$137

Flights from Ontario to

Honolulu

from$231

Flights from Ontario to

Las Vegas

from$49

Flights from Ontario to

León, Guanajuato

from$64

Flights from Ontario to

Morelia

from$40

Flights from Ontario to

Oakland, California

from$113

Flights from Ontario to

Portland

from$49

Flights from Ontario to

Sacramento

from$84

Flights from Ontario to

San Francisco

from$48

Flights from Ontario to

San José del Cabo

from$39

Flights from Ontario to

San Salvador

from$236

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 amONT-DEN

2h 26mnonstop

$48Frontier

Find Deal

fr., feb. 13

3:20 pm - 6:40 pmONT-DEN

2h 20mnonstop

$49Frontier

Find Deal

fr., des. 12

6:15 am - 4:51 pmONT-SFO

10h 36m1 stop

$52Frontier

Find Deal

ti., des. 9

4:03 pm - 6:54 pmONT-SEA

2h 51mnonstop

$79Alaska Airlines

Find Deal

to., jan. 29

3:30 pm - 6:35 pmONT-SEA

3h 05mnonstop

$80Delta

Find Deal

fr., jan. 30

1:46 pm - 6:43 pmONT-SEA

4h 57m1 stop

$89Alaska Airlines

Find Deal

fr., jan. 16

1:15 pm - 10:28 pmONT-HOU

7h 13m1 stop

$109Delta

Find Deal

on., feb. 25

5:05 am - 8:19 pmONT-LGA

12h 14m2 stops

$130United Airlines

Find Deal

sø., jan. 18

6:45 am - 10:20 pmONT-LGA

12h 35m1 stop

$131Southwest

Find Deal

lø., des. 13

1:35 pm - 6:35 pmONT-HOU

3h 00mnonstop

$137Southwest

Find Deal

lø., feb. 28

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?

Departing from Ontario, the top domestic flight destinations, based on momondo users' searches, include Seattle, Denver, Portland, Houston, and Honolulu.

What are the cheapest cities to fly to from Ontario?

The cheapest city to fly to from Ontario currently is San José del Cabo at $39. The next cheapest destinations are Morelia, Seattle, San Francisco, Portland and Houston.

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 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 $39 to San José del Cabo. Prices will vary according to several factors such as the departure date and time, but on average you can expect to pay around $134 to travel from Ontario to San José del Cabo.

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 11, 8 and 5 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 December 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.