Cheap flights from Ontario (ONT) from $29

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Fly to

Route

Depart

Return

Price

Cheapest one-way

OntarioDenver

ONT Ontario - DEN Denver Intl

ONTDEN

Ontario

Wed 9/30

11:45 am-3:07 pm

Nonstop2h 22m

$29

OntarioDenver

ONT Ontario - DEN Denver Intl

ONTDEN

Ontario

Tue 12/15

4:46 pm-8:09 pm

Nonstop2h 23m

$33

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Tue 10/20

4:03 pm-5:50 pm

Nonstop1h 47m

$59

Quickest one-way

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Tue 10/20

11:10 am-12:43 pm

Nonstop1h 33m

$59

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Sat 10/17

3:10 pm-9:35 pm

1 stop6h 25m

$76

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Thu 10/15

1:30 pm-5:35 pm

1 stop4h 05m

$76

OntarioSeattle

ONT Ontario - SEA Seattle/Tacoma Intl

ONTSEA

Ontario

Thu 12/10

7:11 am-1:38 pm

1 stop6h 27m

$80

OntarioSeattle

ONT Ontario - SEA Seattle/Tacoma Intl

ONTSEA

Ontario

Mon 11/9

12:01 pm-5:21 pm

1 stop5h 20m

$81

OntarioDenver

ONT Ontario - DEN Denver Intl

ONTDEN

Ontario

Sat 12/5

10:03 am-6:12 pm

1 stop7h 09m

$89

OntarioDenver

ONT Ontario - DEN Denver Intl

ONTDEN

Ontario

Sat 10/31

6:02 am-2:08 pm

1 stop7h 06m

$89

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

Where can I directly fly to from Ontario?

Currently, 16 destinations can be reached directly via flights from Ontario.

Flights from Ontario to

Boise

from$197

Flights from Ontario to

Denver

from$120

Flights from Ontario to

Guadalajara

from$150

Flights from Ontario to

Honolulu

from$162

Flights from Ontario to

Las Vegas

from$60

Flights from Ontario to

León, Guanajuato

from$101

Flights from Ontario to

Morelia

from$171

Flights from Ontario to

Oakland, California

from$118

Flights from Ontario to

Portland

from$188

Flights from Ontario to

Sacramento

from$89

Flights from Ontario to

San Francisco

from$30

Flights from Ontario to

San Jose, California

from$58

Flights from Ontario to

San José del Cabo

from$100

Flights from Ontario to

San Salvador

from$367

Flights from Ontario to

Santa Rosa

from$108

Flights from Ontario to

Seattle

from$64

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.

11:45 am - 3:07 pmONT Ontario-DEN Denver Intl

2h 22mnonstop

$29Frontier

Wed, Sep 30

4:46 pm - 8:09 pmONT Ontario-DEN Denver Intl

2h 23mnonstop

$33Frontier

Tue, Dec 15

4:03 pm - 5:50 pmONT Ontario-SFO San Francisco

1h 47mnonstop

$59United Airlines

Tue, Oct 20

11:10 am - 12:43 pmONT Ontario-SFO San Francisco

1h 33mnonstop

$59United Airlines

Tue, Oct 20

3:10 pm - 9:35 pmONT Ontario-SFO San Francisco

6h 25m1 stop Las Vegas Harry Reid Intl

$76Southwest

Sat, Oct 17

1:30 pm - 5:35 pmONT Ontario-SFO San Francisco

4h 05m1 stop Las Vegas Harry Reid Intl

$76Southwest

Thu, Oct 15

7:11 am - 1:38 pmONT Ontario-SEA Seattle/Tacoma Intl

6h 27m1 stop San Francisco

$80Multiple Airlines

Thu, Dec 10

12:01 pm - 5:21 pmONT Ontario-SEA Seattle/Tacoma Intl

5h 20m1 stop San Francisco

$81Multiple Airlines

Mon, Nov 9

10:03 am - 6:12 pmONT Ontario-DEN Denver Intl

7h 09m1 stop Portland

$89Alaska Airlines

Sat, Dec 5

6:02 am - 2:08 pmONT Ontario-DEN Denver Intl

7h 06m1 stop Seattle/Tacoma Intl

$89Alaska Airlines

Sat, Oct 31

Last-minute flight deals from Ontario

Enter your travel dates to find the best prices.

12:07 pm - 1:43 pmONT Ontario-SFO San Francisco

1h 36mnonstop

6:02 pm - 7:36 pmSFO San Francisco-ONT Ontario

1h 34mnonstop

$73Frontier

Thu, Sep 17 - Mon, Sep 21

12:07 pm - 1:43 pmONT Ontario-SFO San Francisco

1h 36mnonstop

6:02 pm - 7:36 pmSFO San Francisco-ONT Ontario

1h 34mnonstop

$81Frontier

Thu, Sep 17 - Mon, Sep 21

2:55 pm - 8:40 pmONT Ontario-SFO San Francisco

5h 45m1 stop Las Vegas Harry Reid Intl

5:05 am - 10:20 amSFO San Francisco-ONT Ontario

5h 15m1 stop Las Vegas Harry Reid Intl

$214Southwest

Sat, Sep 19 - Thu, Oct 15

6:08 am - 7:35 amONT Ontario-SFO San Francisco

1h 27mnonstop

9:25 pm - 10:51 pmSFO San Francisco-ONT Ontario

1h 26mnonstop

$252United Airlines

Sat, Sep 19 - Mon, Oct 5

6:08 am - 7:35 amONT Ontario-SFO San Francisco

1h 27mnonstop

6:30 pm - 8:01 pmSFO San Francisco-ONT Ontario

1h 31mnonstop

$257United Airlines

Fri, Sep 18 - Sat, Sep 19

5:45 am - 11:05 amONT Ontario-SFO San Francisco

5h 20m1 stop Las Vegas Harry Reid Intl

4:40 pm - 9:00 pmSFO San Francisco-ONT Ontario

4h 20m1 stop Las Vegas Harry Reid Intl

$277Southwest

Wed, Sep 16 - Wed, Sep 16

1:05 pm - 7:11 pmONT Ontario-SFO San Francisco

6h 06m1 stop Phoenix Sky Harbor Intl

12:19 pm - 6:17 pmSFO San Francisco-ONT Ontario

5h 58m1 stop Phoenix Sky Harbor Intl

$277American Airlines

Sat, Sep 19 - Mon, Sep 21

1:04 pm - 7:11 pmONT Ontario-SFO San Francisco

6h 07m1 stop Phoenix Sky Harbor Intl

5:50 am - 12:03 pmSFO San Francisco-ONT Ontario

6h 13m1 stop Phoenix Sky Harbor Intl

$277American Airlines

Thu, Sep 17 - Sat, Sep 19

11:54 am - 11:57 pmONT Ontario-ORD Chicago O'Hare Intl

10h 03m1 stop Seattle/Tacoma Intl

7:05 am - 6:41 pmORD Chicago O'Hare Intl-ONT Ontario

13h 36m2 stops Detroit Metropolitan Wayne County Atlanta Hartsfield-Jackson

$283Delta

Fri, Sep 18 - Sat, Oct 3

10:00 pm - 10:37 amONT Ontario-ORD Chicago O'Hare Intl

10h 37m2 stops Atlanta Hartsfield-Jackson Detroit Metropolitan Wayne County

1:51 pm - 10:04 pmORD Chicago O'Hare Intl-ONT Ontario

10h 13m2 stops Atlanta Hartsfield-Jackson Salt Lake City

$288Delta

Fri, Sep 18 - Sat, Oct 3

Cheapest international flights from Ontario

Enter your travel dates to find the best prices.

9:36 pm - 1:39 amONT Ontario-GDL Guadalajara Miguel Hidal

3h 03mnonstop

8:59 pm - 11:05 pmGDL Guadalajara Miguel Hidal-ONT Ontario

3h 06mnonstop

$288Volaris

Sat, Oct 10 - Mon, Oct 26

9:36 pm - 1:39 amONT Ontario-GDL Guadalajara Miguel Hidal

3h 03mnonstop

8:59 pm - 11:05 pmGDL Guadalajara Miguel Hidal-ONT Ontario

3h 06mnonstop

$289Volaris

Thu, Oct 8 - Tue, Oct 13

12:55 am - 4:58 amONT Ontario-GDL Guadalajara Miguel Hidal

3h 03mnonstop

5:40 pm - 7:46 pmGDL Guadalajara Miguel Hidal-ONT Ontario

3h 06mnonstop

$290Volaris

Tue, Oct 20 - Wed, Oct 28

9:36 pm - 1:39 amONT Ontario-GDL Guadalajara Miguel Hidal

3h 03mnonstop

5:40 pm - 7:46 pmGDL Guadalajara Miguel Hidal-ONT Ontario

3h 06mnonstop

$291Volaris

Mon, Oct 12 - Sat, Oct 17

12:55 am - 4:58 amONT Ontario-GDL Guadalajara Miguel Hidal

3h 03mnonstop

8:59 pm - 11:05 pmGDL Guadalajara Miguel Hidal-ONT Ontario

3h 06mnonstop

$292Volaris

Wed, Sep 30 - Thu, Oct 8

12:55 am - 4:58 amONT Ontario-GDL Guadalajara Miguel Hidal

3h 03mnonstop

5:40 pm - 7:46 pmGDL Guadalajara Miguel Hidal-ONT Ontario

3h 06mnonstop

$293Volaris

Wed, Sep 30 - Sat, Oct 17

9:36 pm - 1:39 amONT Ontario-GDL Guadalajara Miguel Hidal

3h 03mnonstop

5:40 pm - 7:46 pmGDL Guadalajara Miguel Hidal-ONT Ontario

3h 06mnonstop

$294Volaris

Tue, Oct 6 - Tue, Oct 13

9:36 pm - 1:39 amONT Ontario-GDL Guadalajara Miguel Hidal

3h 03mnonstop

5:40 pm - 7:46 pmGDL Guadalajara Miguel Hidal-ONT Ontario

3h 06mnonstop

$295Volaris

Thu, Oct 1 - Thu, Oct 15

9:36 pm - 1:39 amONT Ontario-GDL Guadalajara Miguel Hidal

3h 03mnonstop

8:59 pm - 11:05 pmGDL Guadalajara Miguel Hidal-ONT Ontario

3h 06mnonstop

$296Volaris

Fri, Oct 9 - Mon, Oct 26

12:55 am - 4:58 amONT Ontario-GDL Guadalajara Miguel Hidal

3h 03mnonstop

8:59 pm - 11:05 pmGDL Guadalajara Miguel Hidal-ONT Ontario

3h 06mnonstop

$297Volaris

Fri, Oct 16 - Sat, Oct 31

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 Chicago, Chicago, Portland, Phoenix and Honolulu.

What are the cheapest cities to fly to from Ontario?

The cheapest city to fly to from Ontario currently is San Francisco at $30. The next cheapest destinations are San Jose, Las Vegas, Seattle, Phoenix 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 JetBlue. For example, Frontier flights from Ontario to San Jose, California, start at $29, Alaska Airlines flights from Ontario to San Francisco cost around $50, and JetBlue flights from Ontario to Las Vegas are around $56.

What is the cheapest flight available from Ontario?

Currently, the cheapest flight from Ontario found by our users is for $30 to San Francisco. Prices will vary according to several factors such as the departure date and time, but on average you can expect to pay around $1,821 to travel from Ontario to San Francisco.

Which destinations have the most frequent flights from Ontario?

Dallas/Fort Worth Airport, Seattle and Denver are currently the destinations served most frequently from Ontario, with 21, 17 and 11 flights per day on average, respectively.

Which airlines can you fly with from Ontario?

Airlines including American Airlines, United Airlines and Delta 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 San Francisco, for which the starting price of a first class seat can be as low as $354.

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 September 2026, there are 28 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.