Cheap flights from Ontario (ONT) from $70

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Route

Depart

Return

Price

Cheapest one-way

Quickest one-way

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Sat 8/22

8:48 am-10:15 am

Nonstop1h 27m

$29

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Mon 8/24

8:48 am-10:15 am

Nonstop1h 27m

$29

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Sat 10/10

8:03 am-9:30 am

Nonstop1h 27m

$76

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Sat 10/31

6:00 am-7:30 am

Nonstop1h 30m

$76

OntarioDenver

ONT Ontario - DEN Denver Intl

ONTDEN

Ontario

Sun 9/6

12:15 pm-5:35 pm

1 stop4h 20m

$84

OntarioDenver

ONT Ontario - DEN Denver Intl

ONTDEN

Ontario

Sun 9/6

12:15 pm-5:35 pm

1 stop4h 20m

$84

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Fri 9/11

1:04 pm-7:11 pm

1 stop6h 07m

$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

Fri 10/30

9:45 am-4:56 pm

1 stop6h 11m

$99

OntarioDenver

ONT Ontario - DEN Denver Intl

ONTDEN

Ontario

Sun 9/6

1:06 pm-8:01 pm

1 stop5h 55m

$99

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

Atlanta

from$165

Flights from Ontario to

Austin

from$118

Flights from Ontario to

Boise

from$138

Flights from Ontario to

Honolulu

from$172

Flights from Ontario to

Las Vegas

from$69

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$88

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$346

Flights from Ontario to

Santa Rosa

from$143

Flights from Ontario to

Seattle

from$81

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.

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

1h 27mnonstop

$29Frontier

Sat, Aug 22

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

1h 27mnonstop

$29Frontier

Mon, Aug 24

8:03 am - 9:30 amONT Ontario-SFO San Francisco

1h 27mnonstop

$76United Airlines

Sat, Oct 10

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

1h 30mnonstop

$76United Airlines

Sat, Oct 31

12:15 pm - 5:35 pmONT Ontario-DEN Denver Intl

4h 20m1 stop Sacramento Intl

$84Southwest

Sun, Sep 6

12:15 pm - 5:35 pmONT Ontario-DEN Denver Intl

4h 20m1 stop Sacramento Intl

$84Southwest

Sun, Sep 6

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

6h 07m1 stop Phoenix Sky Harbor Intl

$89American Airlines

Fri, Sep 11

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

6h 02m1 stop Phoenix Sky Harbor Intl

$89American Airlines

Sun, Sep 6

9:45 am - 4:56 pmONT Ontario-DEN Denver Intl

6h 11m1 stop Salt Lake City

$99Delta

Fri, Oct 30

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

5h 55m1 stop Salt Lake City

$99Delta

Sun, Sep 6

Last-minute flight deals from Ontario

Enter your travel dates to find the best prices.

8:58 am - 10:25 amONT Ontario-SFO San Francisco

1h 27mnonstop

12:33 pm - 2:03 pmSFO San Francisco-ONT Ontario

1h 30mnonstop

$174Frontier

Sun, Aug 9 - Tue, Aug 25

8:58 am - 10:25 amONT Ontario-SFO San Francisco

1h 27mnonstop

9:33 am - 11:02 amSFO San Francisco-ONT Ontario

1h 29mnonstop

$174Frontier

Sun, Aug 9 - Sat, Aug 22

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

7h 03m1 stop Dallas/Fort Worth

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

6h 16m1 stop Phoenix Sky Harbor Intl

$297American Airlines

Thu, Aug 6 - Fri, Aug 7

11:47 am - 11:04 amONT Ontario-SEA Seattle/Tacoma Intl

23h 17m1 stop Las Vegas Harry Reid Intl

10:41 am - 3:47 pmSEA Seattle/Tacoma Intl-ONT Ontario

5h 06m1 stop Santa Rosa Sonoma County

$299Multiple Airlines

Mon, Aug 10 - Tue, Aug 25

6:00 am - 1:17 pmONT Ontario-SEA Seattle/Tacoma Intl

7h 17m1 stop Denver Intl

10:00 am - 4:10 pmSEA Seattle/Tacoma Intl-ONT Ontario

6h 10m1 stop Boise Air Term. Gowen Fld

$304Multiple Airlines

Sun, Aug 9 - Sat, Aug 29

5:00 am - 3:46 pmONT Ontario-LGA New York LaGuardia

7h 46m1 stop Denver Intl

3:29 pm - 10:35 pmLGA New York LaGuardia-ONT Ontario

10h 06m1 stop Chicago O'Hare Intl

$337United Airlines

Mon, Aug 10 - Fri, Aug 21

5:00 am - 3:46 pmONT Ontario-LGA New York LaGuardia

7h 46m1 stop Denver Intl

4:25 pm - 10:35 pmLGA New York LaGuardia-ONT Ontario

9h 10m1 stop Chicago O'Hare Intl

$337United Airlines

Sat, Aug 8 - Fri, Aug 21

12:59 pm - 11:58 pmONT Ontario-JFK New York John F Kennedy Intl

7h 59m1 stop Phoenix Sky Harbor Intl

7:15 am - 12:03 pmJFK New York John F Kennedy Intl-ONT Ontario

7h 48m1 stop Phoenix Sky Harbor Intl

$342American Airlines

Mon, Aug 10 - Fri, Aug 21

12:00 pm - 1:14 amONT Ontario-JFK New York John F Kennedy Intl

10h 14m1 stop Atlanta Hartsfield-Jackson

3:40 pm - 9:52 pmJFK New York John F Kennedy Intl-ONT Ontario

9h 12m1 stop Atlanta Hartsfield-Jackson

$342Delta

Mon, Aug 10 - Fri, Aug 21

7:05 am - 7:52 pmONT Ontario-JFK New York John F Kennedy Intl

9h 47m1 stop Atlanta Hartsfield-Jackson

6:00 am - 10:42 amJFK New York John F Kennedy Intl-ONT Ontario

7h 42m1 stop Atlanta Hartsfield-Jackson

$368Delta

Sun, Aug 9 - Fri, Aug 21

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

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

28h 06m1 stop San Francisco

$302Multiple Airlines

Fri, Sep 25 - Wed, Sep 30

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

11h 10m1 stop Las Vegas Harry Reid Intl

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

27h 56m2 stops Calgary San Francisco

$310Multiple Airlines

Fri, Sep 25 - Wed, Sep 30

8:00 am - 7:25 pmONT Ontario-YVR Vancouver Intl

11h 25m2 stops Las Vegas Harry Reid Intl Calgary

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

28h 06m1 stop San Francisco

$311Multiple Airlines

Sun, Sep 13 - Wed, Sep 16

3:13 pm - 2:30 pmONT Ontario-YVR Vancouver Intl

23h 17m2 stops San Francisco Los Angeles

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

28h 06m1 stop San Francisco

$316Multiple Airlines

Tue, Sep 8 - Wed, Sep 16

8:00 am - 7:25 pmONT Ontario-YVR Vancouver Intl

11h 25m2 stops Las Vegas Harry Reid Intl Calgary

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

28h 06m1 stop San Francisco

$317Multiple Airlines

Sun, Sep 13 - Wed, Sep 16

9:01 am - 8:59 pmONT Ontario-YVR Vancouver Intl

11h 58m1 stop San Francisco

2:20 pm - 8:53 pmYVR Vancouver Intl-ONT Ontario

6h 33m1 stop Denver Intl

$318Lufthansa

Sun, Aug 16 - Tue, Aug 25

8:00 am - 7:25 pmONT Ontario-YVR Vancouver Intl

11h 25m2 stops Las Vegas Harry Reid Intl Calgary

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

28h 06m1 stop San Francisco

$320Multiple Airlines

Sun, Sep 13 - Wed, Sep 16

11:45 am - 7:55 pmONT Ontario-YVR Vancouver Intl

32h 10m2 stops Denver Intl Phoenix Sky Harbor Intl

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

7h 19m1 stop Las Vegas Harry Reid Intl

$322Multiple Airlines

Sat, Sep 12 - Tue, Sep 22

6:02 am - 10:52 amONT Ontario-YVR Vancouver Intl

4h 50m1 stop Seattle/Tacoma Intl

5:25 pm - 11:45 pmYVR Vancouver Intl-ONT Ontario

6h 20m1 stop Seattle/Tacoma Intl

$323Alaska Airlines

Sat, Oct 24 - Mon, Oct 26

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

9h 03m1 stop San Francisco

8:20 am - 7:04 amYVR Vancouver Intl-ONT Ontario

22h 44m2 stops Los Angeles Las Vegas Harry Reid Intl

$324Multiple Airlines

Mon, Sep 28 - Thu, Oct 1

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, Denver, Phoenix, Chicago 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 $28. The next cheapest destinations are San Jose, Las Vegas, Houston, 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 $1,802 to travel from Ontario to San Francisco.

Which destinations have the most frequent flights from Ontario?

Seattle, Atlanta and Salt Lake City are currently the destinations served most frequently from Ontario, with 18, 12 and 9 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 Phoenix Sky Harbor Intl Airport, for which the starting price of a first class seat can be as low as $431.

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.