Cheap flights from Ontario (ONT) from $22

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Fly to

Route

Depart

Return

Price

Cheapest one-way

OntarioDenver

ONT Ontario - DEN Denver Intl

ONTDEN

Ontario

Wed 12/16

6:00 am-9:24 am

Nonstop2h 24m

$22

OntarioDenver

ONT Ontario - DEN Denver Intl

ONTDEN

Ontario

Sat 12/5

6:00 am-9:24 am

Nonstop2h 24m

$23

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Tue 12/22

4:00 pm-5:50 pm

Nonstop1h 50m

$59

OntarioLas Vegas

ONT Ontario - LAS Las Vegas Harry Reid Intl

ONTLAS

Ontario

Fri 1/1

1:30 pm-2:35 pm

Nonstop1h 05m

$64

Quickest one-way

OntarioLas Vegas

ONT Ontario - LAS Las Vegas Harry Reid Intl

ONTLAS

Ontario

Wed 12/23

6:30 pm-7:30 pm

Nonstop1h 00m

$64

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Sat 2/27

11:27 am-1:00 pm

Nonstop1h 33m

$70

OntarioLas Vegas

ONT Ontario - LAS Las Vegas Harry Reid Intl

ONTLAS

Ontario

Tue 3/9

9:28 am-4:02 pm

1 stop6h 34m

$79

OntarioLas Vegas

ONT Ontario - LAS Las Vegas Harry Reid Intl

ONTLAS

Ontario

Wed 12/9

6:30 am-1:11 pm

1 stop6h 41m

$79

OntarioChicago

ONT Ontario - ORD Chicago O'Hare Intl

ONTORD

Ontario

Tue 12/15

7:05 am-7:09 pm

1 stop10h 04m

$130

OntarioChicago

ONT Ontario - ORD Chicago O'Hare Intl

ONTORD

Ontario

Tue 12/1

1:11 pm-9:56 pm

1 stop6h 45m

$130

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

Where can I directly fly to from Ontario?

Currently, 12 destinations can be reached directly via flights from Ontario.

Flights from Ontario to

Austin

from$148

Flights from Ontario to

Boise

from$217

Flights from Ontario to

Guadalajara

from$132

Flights from Ontario to

Honolulu

from$192

Flights from Ontario to

León, Guanajuato

from$194

Flights from Ontario to

Morelia

from$190

Flights from Ontario to

Oakland, California

from$24

Flights from Ontario to

San Francisco

from$62

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$461

Flights from Ontario to

Seattle

from$52

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.

6:00 am - 9:24 amONT Ontario-DEN Denver Intl

2h 24mnonstop

$22Frontier

Wed, Dec 16

6:00 am - 9:24 amONT Ontario-DEN Denver Intl

2h 24mnonstop

$23Frontier

Sat, Dec 5

4:00 pm - 5:50 pmONT Ontario-SFO San Francisco

1h 50mnonstop

$59United Airlines

Tue, Dec 22

1:30 pm - 2:35 pmONT Ontario-LAS Las Vegas Harry Reid Intl

1h 05mnonstop

$64Southwest

Fri, Jan 1

6:30 pm - 7:30 pmONT Ontario-LAS Las Vegas Harry Reid Intl

1h 00mnonstop

$64Southwest

Wed, Dec 23

11:27 am - 1:00 pmONT Ontario-SFO San Francisco

1h 33mnonstop

$70United Airlines

Sat, Feb 27

9:28 am - 4:02 pmONT Ontario-LAS Las Vegas Harry Reid Intl

6h 34m1 stop Phoenix Sky Harbor Intl

$79American Airlines

Tue, Mar 9

6:30 am - 1:11 pmONT Ontario-LAS Las Vegas Harry Reid Intl

6h 41m1 stop Phoenix Sky Harbor Intl

$79American Airlines

Wed, Dec 9

7:05 am - 7:09 pmONT Ontario-ORD Chicago O'Hare Intl

10h 04m1 stop Atlanta Hartsfield-Jackson

$130Delta

Tue, Dec 15

1:11 pm - 9:56 pmONT Ontario-ORD Chicago O'Hare Intl

6h 45m1 stop Salt Lake City

$130Delta

Tue, Dec 1

Last-minute flight deals from Ontario

Enter your travel dates to find the best prices.

12:01 pm - 1:36 pmONT Ontario-SFO San Francisco

1h 35mnonstop

9:35 pm - 10:58 pmSFO San Francisco-ONT Ontario

1h 23mnonstop

$100Frontier

Fri, Nov 13 - Fri, Dec 4

12:01 pm - 1:36 pmONT Ontario-SFO San Francisco

1h 35mnonstop

6:04 pm - 7:30 pmSFO San Francisco-ONT Ontario

1h 26mnonstop

$105Frontier

Fri, Nov 13 - Mon, Nov 16

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

1h 30mnonstop

6:50 pm - 8:15 pmSFO San Francisco-ONT Ontario

1h 25mnonstop

$279United Airlines

Wed, Nov 11 - Wed, Nov 18

1:35 pm - 3:05 pmONT Ontario-SFO San Francisco

1h 30mnonstop

6:50 pm - 8:15 pmSFO San Francisco-ONT Ontario

1h 25mnonstop

$314United Airlines

Sat, Nov 14 - Sat, Nov 14

8:35 pm - 5:13 amONT Ontario-ORD Chicago O'Hare Intl

6h 38m1 stop Las Vegas Harry Reid Intl

7:00 am - 3:13 pmORD Chicago O'Hare Intl-ONT Ontario

10h 13m1 stop Seattle/Tacoma Intl

$333Multiple Airlines

Fri, Nov 13 - Sun, Nov 15

12:42 pm - 11:59 pmONT Ontario-ORD Chicago O'Hare Intl

9h 17m1 stop Dallas/Fort Worth

6:50 am - 12:42 pmORD Chicago O'Hare Intl-ONT Ontario

7h 52m1 stop Phoenix Sky Harbor Intl

$347American Airlines

Fri, Nov 13 - Sun, Nov 15

11:57 am - 11:59 pmONT Ontario-ORD Chicago O'Hare Intl

10h 02m1 stop Seattle/Tacoma Intl

1:30 pm - 9:57 pmORD Chicago O'Hare Intl-ONT Ontario

10h 27m1 stop Atlanta Hartsfield-Jackson

$347Delta

Thu, Nov 12 - Mon, Nov 16

7:00 am - 4:47 pmONT Ontario-ORD Chicago O'Hare Intl

7h 47m1 stop Seattle/Tacoma Intl

5:30 am - 11:03 amORD Chicago O'Hare Intl-ONT Ontario

7h 33m1 stop Atlanta Hartsfield-Jackson

$347Delta

Thu, Nov 12 - Mon, Nov 16

6:30 am - 12:21 amONT Ontario-ORD Chicago O'Hare Intl

15h 51m1 stop Denver Intl

11:15 am - 11:51 pmORD Chicago O'Hare Intl-ONT Ontario

14h 36m3 stops Cape Girardeau Dallas/Fort Worth Denver Intl

$401Multiple Airlines

Sat, Nov 14 - Wed, Nov 18

6:30 am - 8:00 pmONT Ontario-JFK New York John F Kennedy Intl

10h 30m2 stops Phoenix Sky Harbor Intl Charlotte Douglas

6:40 am - 12:11 pmJFK New York John F Kennedy Intl-ONT Ontario

8h 31m1 stop Dallas/Fort Worth

$407American Airlines

Sat, Nov 14 - Tue, Dec 15

Cheapest international flights from Ontario

Enter your travel dates to find the best prices.

9:20 am - 6:05 pmLAX Los Angeles-MAD Madrid Barajas

23h 45m1 stop Casablanca Mohamed V

3:15 pm - 7:20 amMAD Madrid Barajas-LAX Los Angeles

25h 05m1 stop Casablanca Mohamed V

$593Royal Air Maroc

Tue, Dec 1 - Thu, Dec 17

5:10 pm - 9:30 amLAX Los Angeles-MAD Madrid Barajas

31h 20m1 stop Lisbon Humberto Delgado

7:40 am - 3:15 pmMAD Madrid Barajas-LAX Los Angeles

16h 35m1 stop Lisbon Humberto Delgado

$594TAP AIR PORTUGAL

Thu, Nov 26 - Thu, Dec 10

9:20 am - 7:55 pmLAX Los Angeles-MAD Madrid Barajas

25h 35m2 stops Casablanca Mohamed V Milan Malpensa

6:45 am - 7:20 amMAD Madrid Barajas-LAX Los Angeles

33h 35m2 stops Milan Malpensa Casablanca Mohamed V

$595Multiple Airlines

Tue, Dec 1 - Thu, Dec 10

6:00 am - 6:45 amLAX Los Angeles-CPH Kastrup Copenhagen

15h 45m1 stop New York John F Kennedy Intl

9:00 am - 6:13 pmCPH Kastrup Copenhagen-LAX Los Angeles

18h 13m1 stop New York John F Kennedy Intl

$630Delta

Wed, Apr 7 - Wed, Apr 21

7:30 pm - 3:25 pmLAX Los Angeles-CPH Kastrup Copenhagen

10h 55mnonstop

12:40 pm - 8:19 pmCPH Kastrup Copenhagen-LAX Los Angeles

15h 39m1 stop San Francisco

$631Scandinavian Airlines

Mon, Mar 8 - Mon, Mar 22

9:05 pm - 10:05 pmLAX Los Angeles-CPH Kastrup Copenhagen

16h 00m1 stop Paris Charles de Gaulle

6:00 am - 11:45 amCPH Kastrup Copenhagen-LAX Los Angeles

14h 45m1 stop Amsterdam Schiphol

$634Multiple Airlines

Mon, Dec 28 - Wed, Jan 13

11:30 am - 12:55 amLAX Los Angeles-BKK Bangkok Suvarnabhumi

22h 25m1 stop Shanghai Pu Dong

5:05 am - 9:05 amBKK Bangkok Suvarnabhumi-LAX Los Angeles

19h 00m1 stop Shanghai Pu Dong

$683China Eastern

Wed, Jan 20 - Fri, Feb 26

10:00 pm - 7:00 pmLAX Los Angeles-BKK Bangkok Suvarnabhumi

30h 00m1 stop Guangzhou Baiyun

12:25 pm - 6:30 pmBKK Bangkok Suvarnabhumi-LAX Los Angeles

21h 05m1 stop Guangzhou Baiyun

$684China Southern

Sun, Nov 29 - Mon, Dec 14

11:30 am - 5:50 pmLAX Los Angeles-BKK Bangkok Suvarnabhumi

39h 20m1 stop Shanghai Pu Dong

5:05 am - 10:05 amBKK Bangkok Suvarnabhumi-LAX Los Angeles

19h 00m1 stop Shanghai Pu Dong

$685China Eastern

Tue, Mar 9 - Fri, Mar 19

9:20 am - 4:30 pmLAX Los Angeles-IST Istanbul

20h 10m1 stop Casablanca Mohamed V

6:10 pm - 7:20 amIST Istanbul-LAX Los Angeles

24h 10m1 stop Casablanca Mohamed V

$705Royal Air Maroc

Sun, Nov 29 - Thu, Jan 14

Cheapest domestic flights from Ontario

Enter your travel dates to find the best prices.

11:00 am - 12:10 pmONT Ontario-LAS Las Vegas Harry Reid Intl

1h 10mnonstop

5:45 pm - 11:23 pmLAS Las Vegas Harry Reid Intl-ONT Ontario

5h 38m1 stop San Francisco

$76Frontier

Sat, Dec 5 - Sat, Dec 5

2:00 pm - 3:08 pmONT Ontario-LAS Las Vegas Harry Reid Intl

1h 08mnonstop

5:25 pm - 6:31 pmLAS Las Vegas Harry Reid Intl-ONT Ontario

1h 06mnonstop

$77Frontier

Thu, Dec 3 - Thu, Dec 10

11:00 am - 12:10 pmONT Ontario-LAS Las Vegas Harry Reid Intl

1h 10mnonstop

5:25 pm - 6:31 pmLAS Las Vegas Harry Reid Intl-ONT Ontario

1h 06mnonstop

$78Frontier

Sat, Dec 5 - Mon, Dec 7

11:00 am - 12:10 pmONT Ontario-LAS Las Vegas Harry Reid Intl

1h 10mnonstop

10:45 am - 11:51 amLAS Las Vegas Harry Reid Intl-ONT Ontario

1h 06mnonstop

$79Frontier

Fri, Dec 11 - Mon, Dec 14

8:44 am - 9:50 amONT Ontario-LAS Las Vegas Harry Reid Intl

1h 06mnonstop

11:37 am - 11:23 pmLAS Las Vegas Harry Reid Intl-ONT Ontario

11h 46m1 stop San Francisco

$80Frontier

Thu, Dec 10 - Sat, Dec 12

11:00 am - 12:10 pmONT Ontario-LAS Las Vegas Harry Reid Intl

1h 10mnonstop

3:54 pm - 11:23 pmLAS Las Vegas Harry Reid Intl-ONT Ontario

7h 29m1 stop San Francisco

$81Frontier

Mon, Dec 7 - Wed, Dec 9

6:00 am - 9:24 amONT Ontario-DEN Denver Intl

2h 24mnonstop

8:57 pm - 11:23 pmDEN Denver Intl-ONT Ontario

27h 26m1 stop San Francisco

$81Frontier

Wed, Dec 9 - Tue, Dec 15

7:26 pm - 4:10 pmONT Ontario-LAS Las Vegas Harry Reid Intl

20h 44m1 stop San Francisco

8:55 pm - 9:56 pmLAS Las Vegas Harry Reid Intl-ONT Ontario

1h 01mnonstop

$82Frontier

Tue, Dec 15 - Sat, Dec 19

11:30 am - 2:55 pmONT Ontario-DEN Denver Intl

2h 25mnonstop

2:09 pm - 11:23 pmDEN Denver Intl-ONT Ontario

10h 14m1 stop San Francisco

$82Frontier

Thu, Dec 10 - Tue, Dec 15

11:00 am - 12:10 pmONT Ontario-LAS Las Vegas Harry Reid Intl

1h 10mnonstop

5:25 pm - 6:31 pmLAS Las Vegas Harry Reid Intl-ONT Ontario

1h 06mnonstop

$83Frontier

Fri, Dec 11 - Sun, Dec 13

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, San Francisco, Phoenix, Denver and Portland.

What are the cheapest cities to fly to from Ontario?

The cheapest city to fly to from Ontario currently is Oakland at $24. The next cheapest destinations are Las Vegas, Seattle, San Jose, Phoenix and San Francisco.

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 Oakland, California, start at $46, Alaska Airlines flights from Ontario to San Francisco cost around $49, and JetBlue flights from Ontario to Las Vegas are around $58.

What is the cheapest flight available from Ontario?

Currently, the cheapest flight from Ontario found by our users is for $24 to Oakland, California. Prices will vary according to several factors such as the departure date and time, but on average you can expect to pay around $235 to travel from Ontario to Oakland, California.

Which destinations have the most frequent flights from Ontario?

Dallas/Fort Worth Airport, Phoenix Sky Harbor Intl Airport and Denver are currently the destinations served most frequently from Ontario, with 19, 11 and 10 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 Phoenix Sky Harbor Intl Airport, for which the starting price of a first class seat can be as low as $377.

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 November 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.