Cheap flights from Ontario (ONT) from $66

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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

$30

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Thu 10/1

12:07 pm-1:43 pm

Nonstop1h 36m

$30

Quickest one-way

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Sat 11/7

6:00 am-7:30 am

Nonstop1h 30m

$73

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Tue 12/22

1:18 pm-2:51 pm

Nonstop1h 33m

$73

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Sat 9/5

5:50 am-11:35 am

1 stop5h 45m

$86

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Sat 9/5

5:50 am-11:35 am

1 stop5h 45m

$89

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Sun 9/6

10:00 am-4:02 pm

1 stop6h 02m

$89

OntarioDenver

ONT Ontario - DEN Denver Intl

ONTDEN

Ontario

Sat 9/5

12:59 pm-6:29 pm

1 stop4h 30m

$89

OntarioDenver

ONT Ontario - DEN Denver Intl

ONTDEN

Ontario

Sun 9/6

1:06 pm-8:01 pm

1 stop5h 55m

$99

OntarioChicago

ONT Ontario - ORD Chicago O'Hare Intl

ONTORD

Ontario

Wed 9/9

6:00 am-5:33 pm

2 stops9h 33m

$124

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

Austin

from$118

Flights from Ontario to

Boise

from$138

Flights from Ontario to

Denver

from$100

Flights from Ontario to

Honolulu

from$172

Flights from Ontario to

Las Vegas

from$78

Flights from Ontario to

León, Guanajuato

from$99

Flights from Ontario to

Morelia

from$162

Flights from Ontario to

Oakland, California

from$88

Flights from Ontario to

Sacramento

from$105

Flights from Ontario to

San Francisco

from$28

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$364

Flights from Ontario to

Santa Rosa

from$200

Flights from Ontario to

Seattle

from$78

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

$30Frontier

Mon, Sep 28

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

1h 36mnonstop

$30Frontier

Thu, Oct 1

6:00 am - 7:30 amONT Ontario-SFO San Francisco

1h 30mnonstop

$73United Airlines

Sat, Nov 7

1:18 pm - 2:51 pmONT Ontario-SFO San Francisco

1h 33mnonstop

$73United Airlines

Tue, Dec 22

5:50 am - 11:35 amONT Ontario-SFO San Francisco

5h 45m1 stop Las Vegas Harry Reid Intl

$86Southwest

Sat, Sep 5

5:50 am - 11:35 amONT Ontario-SFO San Francisco

5h 45m1 stop Las Vegas Harry Reid Intl

$89Southwest

Sat, Sep 5

10:00 am - 4:02 pmONT Ontario-SFO San Francisco

6h 02m1 stop Phoenix Sky Harbor Intl

$89American Airlines

Sun, Sep 6

12:59 pm - 6:29 pmONT Ontario-DEN Denver Intl

4h 30m1 stop Phoenix Sky Harbor Intl

$89American Airlines

Sat, Sep 5

1:06 pm - 8:01 pmONT Ontario-DEN Denver Intl

5h 55m1 stop Salt Lake City

$99Delta

Sun, Sep 6

6:00 am - 5:33 pmONT Ontario-ORD Chicago O'Hare Intl

9h 33m2 stops Salt Lake City Minneapolis St Paul

$124Delta

Wed, Sep 9

Last-minute flight deals from Ontario

Enter your travel dates to find the best prices.

4:49 pm - 7:38 pmONT Ontario-SEA Seattle/Tacoma Intl

2h 49mnonstop

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

2h 51mnonstop

$181Frontier

Fri, Aug 14 - Fri, Aug 21

4:09 pm - 6:58 pmONT Ontario-SEA Seattle/Tacoma Intl

2h 49mnonstop

10:53 am - 1:45 pmSEA Seattle/Tacoma Intl-ONT Ontario

2h 52mnonstop

$183Frontier

Sat, Aug 15 - Mon, Sep 28

7:55 pm - 5:59 amONT Ontario-ORD Chicago O'Hare Intl

8h 04m1 stop Phoenix Sky Harbor Intl

1:59 pm - 6:15 pmORD Chicago O'Hare Intl-ONT Ontario

6h 16m1 stop Phoenix Sky Harbor Intl

$277American Airlines

Sun, Aug 16 - Wed, Aug 19

2:27 pm - 12:18 amONT Ontario-ORD Chicago O'Hare Intl

7h 51m1 stop Dallas/Fort Worth

6:59 am - 12:03 pmORD Chicago O'Hare Intl-ONT Ontario

7h 04m1 stop Phoenix Sky Harbor Intl

$277American Airlines

Fri, Aug 14 - Tue, Aug 18

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

7h 03m1 stop San Francisco

6:00 am - 12:12 pmORD Chicago O'Hare Intl-ONT Ontario

8h 12m1 stop San Francisco

$277United Airlines

Thu, Aug 13 - Tue, Aug 18

1:18 pm - 9:29 pmONT Ontario-ORD Chicago O'Hare Intl

6h 11m1 stop Denver Intl

6:00 am - 12:12 pmORD Chicago O'Hare Intl-ONT Ontario

8h 12m1 stop San Francisco

$277United Airlines

Fri, Aug 14 - Mon, Aug 17

12:00 pm - 11:57 pmONT Ontario-ORD Chicago O'Hare Intl

9h 57m1 stop Atlanta Hartsfield-Jackson

7:44 pm - 11:34 pmORD Chicago O'Hare Intl-ONT Ontario

5h 50m1 stop Salt Lake City

$277Delta

Wed, Aug 12 - Fri, Aug 14

12:00 pm - 11:57 pmONT Ontario-ORD Chicago O'Hare Intl

9h 57m1 stop Atlanta Hartsfield-Jackson

3:51 pm - 11:34 pmORD Chicago O'Hare Intl-ONT Ontario

9h 43m2 stops Minneapolis St Paul Salt Lake City

$282Delta

Wed, Aug 12 - Mon, Aug 17

4:49 pm - 7:38 pmONT Ontario-SEA Seattle/Tacoma Intl

2h 49mnonstop

10:54 am - 3:52 pmSEA Seattle/Tacoma Intl-ONT Ontario

4h 58m1 stop Santa Rosa Sonoma County

$329Multiple Airlines

Thu, Aug 13 - Sat, Aug 22

4:49 pm - 7:38 pmONT Ontario-SEA Seattle/Tacoma Intl

2h 49mnonstop

3:50 pm - 8:24 pmSEA Seattle/Tacoma Intl-ONT Ontario

4h 34m1 stop Portland

$345Multiple Airlines

Sun, Aug 16 - Fri, Aug 21

Cheapest international flights from Ontario

Enter your travel dates to find the best prices.

8:24 pm - 7:25 pmONT Ontario-YVR Vancouver Intl

23h 01m2 stops Las Vegas Harry Reid Intl Calgary

3:30 pm - 7:36 pmYVR Vancouver Intl-ONT Ontario

28h 06m1 stop San Francisco

$295Multiple Airlines

Mon, Sep 21 - Wed, Sep 30

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

6h 00m1 stop Las Vegas Harry Reid Intl

6:45 am - 9:09 amYVR Vancouver Intl-ONT Ontario

26h 24m2 stops Calgary Las Vegas Harry Reid Intl

$299Multiple Airlines

Thu, Sep 24 - Mon, Sep 28

8:24 pm - 4:15 pmONT Ontario-YVR Vancouver Intl

19h 51m1 stop Las Vegas Harry Reid Intl

3:30 pm - 7:36 pmYVR Vancouver Intl-ONT Ontario

28h 06m1 stop San Francisco

$300Multiple Airlines

Mon, Sep 21 - Wed, Sep 30

12:07 pm - 4:15 pmONT Ontario-YVR Vancouver Intl

52h 08m2 stops San Francisco Las Vegas Harry Reid Intl

3:30 pm - 7:36 pmYVR Vancouver Intl-ONT Ontario

28h 06m1 stop San Francisco

$302Multiple Airlines

Mon, Sep 21 - Wed, Sep 30

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

22h 31m1 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

$307Multiple Airlines

Tue, Sep 22 - Sat, Sep 26

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

22h 31m1 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

$308Multiple Airlines

Tue, Sep 22 - Sat, Sep 26

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

6h 11m1 stop Las Vegas Harry Reid Intl

3:40 pm - 9:09 amYVR Vancouver Intl-ONT Ontario

17h 29m2 stops Calgary Las Vegas Harry Reid Intl

$311Multiple Airlines

Tue, Sep 15 - Fri, Sep 18

8:24 pm - 7:10 pmONT Ontario-YVR Vancouver Intl

22h 46m1 stop Las Vegas Harry Reid Intl

6:45 am - 9:09 amYVR Vancouver Intl-ONT Ontario

26h 24m2 stops Calgary Las Vegas Harry Reid Intl

$313Multiple Airlines

Thu, Sep 17 - Mon, Sep 28

8:00 am - 10:35 pmONT Ontario-YVR Vancouver Intl

14h 35m2 stops Las Vegas Harry Reid Intl Calgary

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

7h 19m1 stop Las Vegas Harry Reid Intl

$314Multiple Airlines

Mon, Sep 21 - Wed, Sep 30

8:24 pm - 7:10 pmONT Ontario-YVR Vancouver Intl

22h 46m1 stop Las Vegas Harry Reid Intl

9:40 am - 9:09 amYVR Vancouver Intl-ONT Ontario

23h 29m1 stop Las Vegas Harry Reid Intl

$315Multiple Airlines

Thu, Sep 17 - Mon, Sep 28

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 Phoenix, Denver, Chicago, Chicago, and Honolulu 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 $28. The next cheapest destinations are San Jose, Houston, Las Vegas, Seattle and Oakland.

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 $28 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 $1,710 to travel from Ontario to San Francisco.

Which destinations have the most frequent flights from Ontario?

Dallas/Fort Worth Airport, Seattle and Atlanta are currently the destinations served most frequently from Ontario, with 20, 17 and 11 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 29 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.