Cheap flights from Ontario (ONT) from $33

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Fly to

Route

Depart

Return

Price

Cheapest one-way

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Thu 9/24

12:07 pm-1:43 pm

Nonstop1h 36m

$33

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Mon 10/26

12:01 pm-1:32 pm

Nonstop1h 31m

$33

Quickest one-way

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Sat 9/19

6:08 am-7:35 am

Nonstop1h 27m

$59

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Thu 11/12

9:25 am-10:55 am

Nonstop1h 30m

$59

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Mon 11/9

5:20 pm-11:40 pm

1 stop6h 20m

$76

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Sat 10/24

5:30 am-9:50 am

1 stop4h 20m

$76

OntarioSeattle

ONT Ontario - SEA Seattle/Tacoma Intl

ONTSEA

Ontario

Mon 10/5

12:07 pm-6:33 pm

1 stop6h 26m

$91

OntarioDenver

ONT Ontario - DEN Denver Intl

ONTDEN

Ontario

Tue 9/15

1:04 pm-7:40 pm

1 stop5h 36m

$99

OntarioDenver

ONT Ontario - DEN Denver Intl

ONTDEN

Ontario

Sat 2/20

1:00 pm-7:10 pm

1 stop5h 10m

$99

OntarioSeattle

ONT Ontario - SEA Seattle/Tacoma Intl

ONTSEA

Ontario

Mon 10/26

12:01 pm-6:33 pm

1 stop6h 32m

$114

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

Austin

from$118

Flights from Ontario to

Boise

from$138

Flights from Ontario to

Denver

from$110

Flights from Ontario to

Guadalajara

from$142

Flights from Ontario to

Honolulu

from$162

Flights from Ontario to

Las Vegas

from$67

Flights from Ontario to

León, Guanajuato

from$104

Flights from Ontario to

Morelia

from$78

Flights from Ontario to

Oakland, California

from$88

Flights from Ontario to

Sacramento

from$105

Flights from Ontario to

San Francisco

from$41

Flights from Ontario to

San Jose, California

from$48

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$59

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

$33Frontier

Thu, Sep 24

12:01 pm - 1:32 pmONT Ontario-SFO San Francisco

1h 31mnonstop

$33Frontier

Mon, Oct 26

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

1h 27mnonstop

$59United Airlines

Sat, Sep 19

9:25 am - 10:55 amONT Ontario-SFO San Francisco

1h 30mnonstop

$59United Airlines

Thu, Nov 12

5:20 pm - 11:40 pmONT Ontario-SFO San Francisco

6h 20m1 stop Phoenix Sky Harbor Intl

$76Southwest

Mon, Nov 9

5:30 am - 9:50 amONT Ontario-SFO San Francisco

4h 20m1 stop Phoenix Sky Harbor Intl

$76Southwest

Sat, Oct 24

12:07 pm - 6:33 pmONT Ontario-SEA Seattle/Tacoma Intl

6h 26m1 stop San Francisco

$91Multiple Airlines

Mon, Oct 5

1:04 pm - 7:40 pmONT Ontario-DEN Denver Intl

5h 36m1 stop Salt Lake City

$99Delta

Tue, Sep 15

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

5h 10m1 stop Salt Lake City

$99Delta

Sat, Feb 20

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

6h 32m1 stop San Francisco

$114Multiple Airlines

Mon, Oct 26

Last-minute flight deals from Ontario

Enter your travel dates to find the best prices.

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

1h 27mnonstop

11:17 am - 4:59 pmSFO San Francisco-ONT Ontario

5h 42m1 stop Las Vegas Harry Reid Intl

$141Frontier

Mon, Aug 31 - Tue, Sep 15

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

1h 27mnonstop

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

1h 30mnonstop

$162Frontier

Mon, Aug 31 - Wed, Sep 2

11:00 am - 10:59 pmONT Ontario-ORD Chicago O'Hare Intl

9h 59m1 stop San Francisco

8:06 pm - 10:35 pmORD Chicago O'Hare Intl-ONT Ontario

4h 29mnonstop

$267United Airlines

Sat, Aug 29 - Tue, Sep 1

1:56 pm - 10:59 pmONT Ontario-ORD Chicago O'Hare Intl

7h 03m1 stop San Francisco

8:06 pm - 10:35 pmORD Chicago O'Hare Intl-ONT Ontario

4h 29mnonstop

$267United Airlines

Fri, Aug 28 - Tue, Sep 1

4:07 pm - 12:28 amONT Ontario-ORD Chicago O'Hare Intl

6h 21m1 stop Phoenix Sky Harbor Intl

7:00 am - 1:31 pmORD Chicago O'Hare Intl-ONT Ontario

8h 31m1 stop Dallas/Fort Worth

$277American Airlines

Mon, Aug 31 - Sun, Sep 6

2:27 pm - 11:30 pmONT Ontario-ORD Chicago O'Hare Intl

7h 03m1 stop Dallas/Fort Worth

7:00 am - 1:53 pmORD Chicago O'Hare Intl-ONT Ontario

8h 53m1 stop Dallas/Fort Worth

$277American Airlines

Mon, Aug 31 - Sat, Sep 5

1:06 pm - 9:33 pmONT Ontario-ORD Chicago O'Hare Intl

6h 27m1 stop Salt Lake City

1:50 pm - 7:53 pmORD Chicago O'Hare Intl-ONT Ontario

8h 03m1 stop Atlanta Hartsfield-Jackson

$277Delta

Fri, Aug 28 - Mon, Aug 31

1:06 pm - 9:33 pmONT Ontario-ORD Chicago O'Hare Intl

6h 27m1 stop Salt Lake City

1:50 pm - 7:53 pmORD Chicago O'Hare Intl-ONT Ontario

8h 03m1 stop Atlanta Hartsfield-Jackson

$277Delta

Sat, Aug 29 - Mon, Aug 31

7:56 pm - 1:36 pmONT Ontario-ORD Chicago O'Hare Intl

15h 40m1 stop Denver Intl

2:22 pm - 8:24 pmORD Chicago O'Hare Intl-ONT Ontario

8h 02m1 stop Portland

$328Multiple Airlines

Sat, Aug 29 - Sat, Sep 5

9:33 am - 12:49 amONT Ontario-ORD Chicago O'Hare Intl

13h 16m1 stop Houston George Bush Intcntl

2:22 pm - 8:24 pmORD Chicago O'Hare Intl-ONT Ontario

8h 02m1 stop Portland

$334Multiple Airlines

Sun, Aug 30 - Sat, Sep 5

Cheapest international flights from Ontario

Enter your travel dates to find the best prices.

12:07 pm - 9:10 pmONT Ontario-YVR Vancouver Intl

9h 03m1 stop San Francisco

3:30 pm - 7:40 pmYVR Vancouver Intl-ONT Ontario

28h 10m1 stop San Francisco

$274Multiple Airlines

Mon, Oct 5 - Wed, Oct 14

11:52 am - 4:20 pmONT Ontario-YVR Vancouver Intl

28h 28m2 stops Denver Intl Phoenix Sky Harbor Intl

7:00 am - 7:28 pmYVR Vancouver Intl-ONT Ontario

12h 28m1 stop San Francisco

$288Multiple Airlines

Mon, Oct 26 - Fri, Oct 30

2:30 pm - 12:15 amONT Ontario-YVR Vancouver Intl

9h 45m2 stops Las Vegas Harry Reid Intl Calgary

3:30 pm - 7:40 pmYVR Vancouver Intl-ONT Ontario

28h 10m1 stop San Francisco

$289Multiple Airlines

Wed, Oct 7 - Wed, Oct 14

2:30 pm - 4:15 pmONT Ontario-YVR Vancouver Intl

25h 45m1 stop Las Vegas Harry Reid Intl

3:30 pm - 7:40 pmYVR Vancouver Intl-ONT Ontario

28h 10m1 stop San Francisco

$294Multiple Airlines

Wed, Oct 7 - Wed, Oct 14

8:35 pm - 4:00 pmONT Ontario-YVR Vancouver Intl

19h 25m1 stop Las Vegas Harry Reid Intl

7:00 am - 7:28 pmYVR Vancouver Intl-ONT Ontario

12h 28m1 stop San Francisco

$301Multiple Airlines

Mon, Oct 26 - Fri, Oct 30

2:30 pm - 4:15 pmONT Ontario-YVR Vancouver Intl

25h 45m1 stop Las Vegas Harry Reid Intl

3:40 pm - 7:36 pmYVR Vancouver Intl-ONT Ontario

27h 56m2 stops Calgary San Francisco

$304Multiple Airlines

Wed, Sep 16 - Wed, Sep 23

6:15 am - 4:50 pmONT Ontario-YVR Vancouver Intl

10h 35m2 stops Denver Intl Calgary

3:30 pm - 7:40 pmYVR Vancouver Intl-ONT Ontario

28h 10m1 stop San Francisco

$309Multiple Airlines

Mon, Oct 5 - Wed, Oct 14

2:30 pm - 8:30 pmONT Ontario-YVR Vancouver Intl

6h 00m1 stop Las Vegas Harry Reid Intl

1:40 pm - 7:04 amYVR Vancouver Intl-ONT Ontario

17h 24m2 stops Calgary Las Vegas Harry Reid Intl

$310Multiple Airlines

Thu, Sep 24 - Sun, Sep 27

8:00 am - 4:15 pmONT Ontario-YVR Vancouver Intl

8h 15m1 stop Las Vegas Harry Reid Intl

5:00 am - 4:34 pmYVR Vancouver Intl-ONT Ontario

11h 34m2 stops Calgary Las Vegas Harry Reid Intl

$311Multiple Airlines

Thu, Sep 17 - Sat, Sep 19

10:04 am - 4:15 pmONT Ontario-YVR Vancouver Intl

6h 11m1 stop Las Vegas Harry Reid Intl

9:40 am - 4:59 pmYVR Vancouver Intl-ONT Ontario

7h 19m1 stop Las Vegas Harry Reid Intl

$312Multiple Airlines

Tue, Sep 15 - Tue, Sep 22

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?

From Ontario, you can take domestic flights to many cities. Searches reveal that momondo users prefer flights to Portland, Phoenix, Chicago, Denver, and Chicago the most.

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 San Jose, Seattle, 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 $49, 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 $1,563 to travel from Ontario to San Francisco.

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, 17 and 12 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 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.