Cheap flights from Ontario (ONT) from $74

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Fly to

Route

Depart

Return

Price

Cheapest one-way

OntarioDenver

ONT - DEN

ONTDEN

Ontario

週二 10/6

2:55 pm-6:17 pm

Nonstop2h 22m

$33

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

週三 6/24

3:34 pm-4:46 pm

Nonstop1h 12m

$34

Quickest one-way

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

週三 6/17

6:35 pm-7:40 pm

Nonstop1h 05m

$69

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

週二 6/30

7:20 pm-11:25 pm

1 stop4h 05m

$79

OntarioDenver

ONT - DEN

ONTDEN

Ontario

週六 8/22

5:00 am-8:21 am

Nonstop2h 21m

$89

OntarioDenver

ONT - DEN

ONTDEN

Ontario

週六 8/8

5:00 am-8:20 am

Nonstop2h 20m

$91

OntarioChicago

ONT - ORD

ONTORD

Ontario

週三 7/22

1:10 pm-11:30 pm

1 stop8h 20m

$111

OntarioChicago

ONT - ORD

ONTORD

Ontario

週三 7/8

1:11 pm-11:30 pm

1 stop8h 19m

$119

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

週六 7/18

4:18 pm-9:21 pm

1 stop5h 03m

$119

OntarioNew York

ONT - JFK

ONTJFK

Ontario

週五 6/5

4:03 pm-7:16 am

1 stop12h 13m

$168

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

Boise

from$108

Flights from Ontario to

Honolulu

from$182

Flights from Ontario to

Las Vegas

from$56

Flights from Ontario to

León, Guanajuato

from$134

Flights from Ontario to

Morelia

from$183

Flights from Ontario to

Oakland, California

from$98

Flights from Ontario to

San Francisco

from$55

Flights from Ontario to

San Jose, California

from$58

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.

2:55 pm - 6:17 pm

ONT

DEN

2h 22mnonstop

$33Frontier

週二, 10月 6

3:34 pm - 4:46 pm

ONT

LAS

1h 12mnonstop

$34Frontier

週三, 6月 24

6:35 pm - 7:40 pm

ONT

LAS

1h 05mnonstop

$69Southwest

週三, 6月 17

7:20 pm - 11:25 pm

ONT

SFO

4h 05m

1 stop

$79Southwest

週二, 6月 30

5:00 am - 8:21 am

ONT

DEN

2h 21mnonstop

$89United Airlines

週六, 8月 22

5:00 am - 8:20 am

ONT

DEN

2h 20mnonstop

$91United Airlines

週六, 8月 8

1:10 pm - 11:30 pm

ONT

ORD

8h 20m

1 stop

$111American Airlines

週三, 7月 22

1:11 pm - 11:30 pm

ONT

ORD

8h 19m

1 stop

$119American Airlines

週三, 7月 8

4:18 pm - 9:21 pm

ONT

SEA

5h 03m

1 stop

$119Alaska Airlines

週六, 7月 18

4:03 pm - 7:16 am

ONT

JFK

12h 13m

1 stop

$168Alaska Airlines

週五, 6月 5

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, Phoenix, Portland, Honolulu and Chicago.

What are the cheapest cities to fly to from Ontario?

The cheapest city to fly to from Ontario currently is Houston at $49. The next cheapest destinations are San Francisco, Las Vegas, San Jose, Santa Rosa 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 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 $47.

What is the cheapest flight available from Ontario?

Currently, the cheapest flight from Ontario found by our users is for $49 to Houston George Bush Intcntl Airport. Prices will vary according to several factors such as the departure date and time, but on average you can expect to pay around $558 to travel from Ontario to Houston George Bush Intcntl Airport.

Which destinations have the most frequent flights from Ontario?

Seattle, Dallas/Fort Worth Airport and Atlanta are currently the destinations served most frequently from Ontario, with 18, 16 and 15 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 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.