Cheap flights from Ontario (ONT) from $43

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Fly to

Route

Depart

Return

Price

Cheapest one-way

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Mon 9/28

12:07 pm-1:43 pm

Nonstop1h 36m

$43

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Thu 12/3

7:11 am-8:44 am

Nonstop1h 33m

$43

Quickest one-way

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Sat 9/26

1:52 pm-3:21 pm

Nonstop1h 29m

$59

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Tue 10/13

11:10 am-12:43 pm

Nonstop1h 33m

$59

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Tue 10/20

6:10 am-10:30 am

1 stop4h 20m

$76

OntarioDenver

ONT Ontario - DEN Denver Intl

ONTDEN

Ontario

Mon 10/12

5:40 am-8:55 am

Nonstop2h 15m

$79

OntarioDenver

ONT Ontario - DEN Denver Intl

ONTDEN

Ontario

Sat 2/27

4:59 pm-10:44 pm

1 stop4h 45m

$89

OntarioSeattle

ONT Ontario - SEA Seattle/Tacoma Intl

ONTSEA

Ontario

Mon 10/26

12:01 pm-6:33 pm

1 stop6h 32m

$93

OntarioDenver

ONT Ontario - DEN Denver Intl

ONTDEN

Ontario

Tue 2/23

1:00 pm-7:10 pm

1 stop5h 10m

$99

OntarioLas Vegas

ONT Ontario - LAS Las Vegas Harry Reid Intl

ONTLAS

Ontario

Thu 11/26

9:20 am-12:37 pm

1 stop3h 17m

$112

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

Where can I directly fly to from Ontario?

Currently, 15 destinations can be reached directly via flights from Ontario.

Flights from Ontario to

Boise

from$138

Flights from Ontario to

Denver

from$107

Flights from Ontario to

Guadalajara

from$142

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$78

Flights from Ontario to

Oakland, California

from$109

Flights from Ontario to

Sacramento

from$89

Flights from Ontario to

San Francisco

from$41

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$49

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.

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

1h 36mnonstop

$43Frontier

Mon, Sep 28

7:11 am - 8:44 amONT Ontario-SFO San Francisco

1h 33mnonstop

$43Frontier

Thu, Dec 3

1:52 pm - 3:21 pmONT Ontario-SFO San Francisco

1h 29mnonstop

$59United Airlines

Sat, Sep 26

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

1h 33mnonstop

$59United Airlines

Tue, Oct 13

6:10 am - 10:30 amONT Ontario-SFO San Francisco

4h 20m1 stop Phoenix Sky Harbor Intl

$76Southwest

Tue, Oct 20

5:40 am - 8:55 amONT Ontario-DEN Denver Intl

2h 15mnonstop

$79Southwest

Mon, Oct 12

4:59 pm - 10:44 pmONT Ontario-DEN Denver Intl

4h 45m1 stop Phoenix Sky Harbor Intl

$89American Airlines

Sat, Feb 27

12:01 pm - 6:33 pmONT Ontario-SEA Seattle/Tacoma Intl

6h 32m1 stop San Francisco

$93Multiple Airlines

Mon, Oct 26

1:00 pm - 7:10 pmONT Ontario-DEN Denver Intl

5h 10m1 stop Salt Lake City

$99Delta

Tue, Feb 23

9:20 am - 12:37 pmONT Ontario-LAS Las Vegas Harry Reid Intl

3h 17m1 stop Phoenix Sky Harbor Intl

$112American Airlines

Thu, Nov 26

Last-minute flight deals from Ontario

Enter your travel dates to find the best prices.

3:13 pm - 4:40 pmONT Ontario-SFO San Francisco

1h 27mnonstop

12:57 pm - 2:27 pmSFO San Francisco-ONT Ontario

1h 30mnonstop

$72Frontier

Tue, Sep 1 - Tue, Sep 8

8:48 am - 10:15 amONT Ontario-SFO San Francisco

1h 27mnonstop

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

1h 34mnonstop

$72Frontier

Thu, Sep 3 - Thu, Sep 10

4:44 pm - 7:33 pmONT Ontario-SEA Seattle/Tacoma Intl

2h 49mnonstop

4:22 pm - 7:03 pmSEA Seattle/Tacoma Intl-ONT Ontario

2h 41mnonstop

$215Multiple Airlines

Tue, Sep 1 - Tue, Sep 29

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

Tue, Sep 1 - Tue, Sep 1

1:56 pm - 3:25 pmONT Ontario-SFO San Francisco

1h 29mnonstop

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

1h 31mnonstop

$257United Airlines

Sat, Sep 5 - Tue, Sep 8

6:02 am - 8:45 amONT Ontario-SEA Seattle/Tacoma Intl

2h 43mnonstop

11:54 am - 2:45 pmSEA Seattle/Tacoma Intl-ONT Ontario

2h 51mnonstop

$276Multiple Airlines

Thu, Sep 3 - Sun, Sep 6

9:40 am - 4:00 pmONT Ontario-SFO San Francisco

6h 20m1 stop Las Vegas Harry Reid Intl

2:35 pm - 8:55 pmSFO San Francisco-ONT Ontario

6h 20m1 stop Phoenix Sky Harbor Intl

$277Southwest

Tue, Sep 1 - Wed, Sep 2

6:40 am - 1:15 pmONT Ontario-SFO San Francisco

6h 35m1 stop Phoenix Sky Harbor Intl

2:35 pm - 8:55 pmSFO San Francisco-ONT Ontario

6h 20m1 stop Phoenix Sky Harbor Intl

$277Southwest

Wed, Sep 2 - Wed, Sep 2

12:59 pm - 7:05 pmONT Ontario-SFO San Francisco

6h 06m1 stop Phoenix Sky Harbor Intl

8:08 am - 3:19 pmSFO San Francisco-ONT Ontario

7h 11m1 stop Phoenix Sky Harbor Intl

$277American Airlines

Wed, Sep 2 - Thu, Sep 3

12:59 pm - 7:05 pmONT Ontario-SFO San Francisco

6h 06m1 stop Phoenix Sky Harbor Intl

12:23 pm - 7:15 pmSFO San Francisco-ONT Ontario

6h 52m1 stop Phoenix Sky Harbor Intl

$277American Airlines

Sat, Sep 5 - Sun, Sep 6

Cheapest international flights from Ontario

Enter your travel dates to find the best prices.

8:00 am - 7:10 pmONT Ontario-YVR Vancouver Intl

11h 10m1 stop Las Vegas Harry Reid Intl

5:00 am - 10:30 amYVR Vancouver Intl-ONT Ontario

29h 30m2 stops Calgary Denver Intl

$336Multiple Airlines

Fri, Sep 25 - Fri, Oct 2

6:37 pm - 11:41 pmONT Ontario-GDL Guadalajara Miguel Hidal

3h 04mnonstop

3:36 pm - 4:49 pmGDL Guadalajara Miguel Hidal-ONT Ontario

3h 13mnonstop

$340Volaris

Sat, Jan 23 - Sat, Jan 30

5:07 pm - 5:00 pmONT Ontario-YVR Vancouver Intl

22h 53m1 stop Las Vegas Harry Reid Intl

4:00 pm - 10:16 amYVR Vancouver Intl-ONT Ontario

19h 16m2 stops Calgary Las Vegas Harry Reid Intl

$343Multiple Airlines

Wed, Nov 4 - Wed, Nov 11

12:05 am - 5:09 amONT Ontario-GDL Guadalajara Miguel Hidal

3h 04mnonstop

9:02 pm - 10:15 pmGDL Guadalajara Miguel Hidal-ONT Ontario

3h 13mnonstop

$343Volaris

Fri, Jan 22 - Sat, Jan 23

5:44 pm - 4:15 pmONT Ontario-YVR Vancouver Intl

22h 31m1 stop Las Vegas Harry Reid Intl

3:40 pm - 7:04 amYVR Vancouver Intl-ONT Ontario

15h 24m2 stops Calgary Las Vegas Harry Reid Intl

$346Multiple Airlines

Tue, Sep 22 - Thu, Sep 24

6:37 pm - 11:41 pmONT Ontario-GDL Guadalajara Miguel Hidal

3h 04mnonstop

9:02 pm - 10:15 pmGDL Guadalajara Miguel Hidal-ONT Ontario

3h 13mnonstop

$347Volaris

Fri, Nov 6 - Mon, Dec 7

12:05 am - 5:09 amONT Ontario-GDL Guadalajara Miguel Hidal

3h 04mnonstop

9:02 pm - 10:15 pmGDL Guadalajara Miguel Hidal-ONT Ontario

3h 13mnonstop

$348Volaris

Wed, Jan 20 - Fri, Jan 29

6:37 pm - 11:41 pmONT Ontario-GDL Guadalajara Miguel Hidal

3h 04mnonstop

9:02 pm - 10:15 pmGDL Guadalajara Miguel Hidal-ONT Ontario

3h 13mnonstop

$349Volaris

Thu, Jan 21 - Fri, Jan 29

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

3h 03mnonstop

9:02 pm - 10:15 pmGDL Guadalajara Miguel Hidal-ONT Ontario

3h 13mnonstop

$350Volaris

Sun, Oct 25 - Sat, Dec 5

12:05 am - 12:04 pmONT Ontario-CUN Cancun

8h 59m1 stop Guadalajara Miguel Hidal

10:20 am - 4:49 pmCUN Cancun-ONT Ontario

9h 29m1 stop Guadalajara Miguel Hidal

$351Volaris

Sun, Jan 31 - Fri, Feb 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 Chicago, Phoenix, Portland, Chicago and Denver.

What are the cheapest cities to fly to from Ontario?

The cheapest city to fly to from Ontario currently is San Francisco at $41. The next cheapest destinations are Seattle, San Jose, Las Vegas, Houston and Phoenix.

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 $41 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 $1,545 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 $337.

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 August 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.