Cheap flights from Ontario (ONT) from $66

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Fly to

Route

Depart

Return

Price

Cheapest one-way

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Sat 6/6

3:30 pm-4:43 pm

Nonstop1h 13m

$29

Quickest one-way

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Sat 4/25

7:44 pm-8:54 pm

Nonstop1h 10m

$32

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Thu 5/14

5:00 am-8:22 am

Nonstop2h 22m

$79

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Sat 5/2

12:19 pm-6:05 pm

1 stop4h 46m

$80

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Tue 6/2

2:10 pm-10:45 pm

2 stops8h 35m

$81

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Fri 6/5

3:40 pm-9:00 pm

1 stop4h 20m

$84

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Tue 8/11

5:00 am-8:20 am

Nonstop2h 20m

$85

OntarioHouston

ONT - HOU

ONTHOU

Ontario

Sat 5/2

10:15 pm-9:58 am

1 stop9h 43m

$109

OntarioHouston

ONT - HOU

ONTHOU

Ontario

Sat 5/2

5:59 pm-9:58 am

2 stops13h 59m

$114

OntarioNew York

ONT - JFK

ONTJFK

Ontario

Tue 5/5

11:59 pm-1:28 pm

2 stops10h 29m

$146

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

Where can I directly fly to from Ontario?

Currently, 19 destinations can be reached directly via flights from Ontario.

Flights from Ontario to

Atlanta

from$148

Flights from Ontario to

Austin

from$180

Flights from Ontario to

Boise

from$128

Flights from Ontario to

Charlotte

from$167

Flights from Ontario to

Denver

from$99

Flights from Ontario to

Guadalajara

from$109

Flights from Ontario to

Honolulu

from$197

Flights from Ontario to

Las Vegas

from$58

Flights from Ontario to

León, Guanajuato

from$103

Flights from Ontario to

Morelia

from$40

Flights from Ontario to

Nashville

from$201

Flights from Ontario to

Oakland, California

from$105

Flights from Ontario to

Salt Lake City

from$118

Flights from Ontario to

San Francisco

from$69

Flights from Ontario to

San Jose, California

from$48

Flights from Ontario to

San José del Cabo

from$40

Flights from Ontario to

San Salvador

from$159

Flights from Ontario to

Santa Rosa

from$68

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.

3:30 pm - 4:43 pm

ONT

LAS

1h 13mnonstop

$29Frontier

Sat, Jun 6

7:44 pm - 8:54 pm

ONT

LAS

1h 10mnonstop

$32Frontier

Sat, Apr 25

5:00 am - 8:22 am

ONT

DEN

2h 22mnonstop

$79United Airlines

Thu, May 14

12:19 pm - 6:05 pm

ONT

DEN

4h 46m

1 stop

$80American Airlines

Sat, May 2

2:10 pm - 10:45 pm

ONT

SFO

8h 35m

2 stops

$81Southwest

Tue, Jun 2

3:40 pm - 9:00 pm

ONT

DEN

4h 20m

1 stop

$84Southwest

Fri, Jun 5

5:00 am - 8:20 am

ONT

DEN

2h 20mnonstop

$85United Airlines

Tue, Aug 11

10:15 pm - 9:58 am

ONT

HOU

9h 43m

1 stop

$109Delta

Sat, May 2

5:59 pm - 9:58 am

ONT

HOU

13h 59m

2 stops

$114Delta

Sat, May 2

11:59 pm - 1:28 pm

ONT

JFK

10h 29m

2 stops

$146American Airlines

Tue, May 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 San Jose, California, Portland, Denver, Phoenix and Seattle.

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 $40. The next cheapest destinations are Morelia, San Jose, Las Vegas, Santa Rosa and San Francisco.

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 $36.

What is the cheapest flight available from Ontario?

Currently, the cheapest flight from Ontario found by our users is for $40 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 $275 to travel from Ontario to San José del Cabo.

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 14, 12 and 9 flights per day on average, respectively.

Which airlines can you fly with from Ontario?

Airlines including American Airlines, United Airlines and China 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 Denver, for which the starting price of a first class seat can be as low as $427.

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 April 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.