What is the cheapest airline that flies from San Diego to Ontario?

Frontier, Alaska Airlines, and United Airlines are the most popular carriers operating from San Diego to Ontario

What airlines fly to Ontario?

United Airlines, Delta and American Airlines are the top three most popular airlines that fly to Ontario from San Diego according to our data. United Airlines is the first choice among our users, with 56% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 5 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from San Diego Airport to Ontario Airport?

Prices for flights from San Diego Airport to Ontario Airport are refreshed on a daily basis.

How old do you have to be to fly from San Diego Airport to Ontario Airport?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from San Diego Airport to 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.

$96 Cheap Flights from San Diego to Ontario in 2025/26

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Find the cheapest flights from San Diego to Los Angeles

Round-trip

One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

2:34 pm - 11:50 pmSAN-ONT

9h 16m1 stop

10:40 pm - 3:58 pmONT-SAN

17h 18m1 stop

$141Frontier

Find Deal

Wed, Oct 29 - Fri, Oct 31

2:34 pm - 11:50 pmSAN-ONT

9h 16m1 stop

8:24 am - 9:27 amONT-SAN

25h 03m2 stops

$169Frontier

Find Deal

Wed, Oct 29 - Fri, Oct 31

1:52 pm - 8:53 pmSAN-ONT

7h 01m1 stop

4:11 pm - 10:59 pmONT-SAN

6h 48m1 stop

$266Alaska Airlines

Find Deal

Fri, Nov 14 - Wed, Nov 19

7:05 pm - 11:08 amSAN-ONT

16h 03m1 stop

6:40 am - 10:45 pmONT-SAN

16h 05m1 stop

$267Delta

Find Deal

Fri, Nov 14 - Tue, Dec 2

6:15 am - 10:55 pmSAN-ONT

16h 40m1 stop

5:49 pm - 12:46 pmONT-SAN

18h 57m1 stop

$277Delta

Find Deal

Sun, Nov 16 - Tue, Dec 2

6:15 am - 5:43 pmSAN-ONT

11h 28m1 stop

6:00 am - 6:34 pmONT-SAN

12h 34m1 stop

$283United Airlines

Find Deal

Thu, Jan 8 - Tue, Jan 13

1:05 pm - 10:49 pmSAN-ONT

9h 44m1 stop

5:05 am - 8:45 pmONT-SAN

15h 40m1 stop

$343United Airlines

Find Deal

Mon, Dec 15 - Wed, Dec 17

6:02 pm - 11:56 pmSAN-ONT

5h 54m1 stop

6:00 am - 4:53 pmONT-SAN

10h 53m1 stop

$344Alaska Airlines

Find Deal

Wed, Nov 19 - Thu, Nov 20

7:30 pm - 8:48 amSAN-ONT

13h 18m1 stop

6:20 am - 3:24 pmONT-SAN

9h 04m1 stop

$467American Airlines

Find Deal

Sat, Dec 20 - Thu, Dec 25

6:30 am - 12:03 pmSAN-ONT

5h 33m1 stop

1:15 pm - 6:25 pmONT-SAN

5h 10m1 stop

$699American Airlines

Find Deal

Thu, Nov 6 - Sun, Nov 9

Alaska Airlines flights from San Diego to Ontario

Our best Alaska Airlines deals on San Diego to Ontario flight tickets

Alaska Airlines

Nov 14

SAN1:52 pmSan Diego

7h 01m

1 stop

ONT8:53 pmOntario

Nov 19

ONT4:11 pmOntario

6h 48m

1 stop

SAN10:59 pmSan Diego

$266

Find similar

Alaska Airlines

Nov 19

SAN6:02 pmSan Diego

5h 54m

1 stop

ONT11:56 pmOntario

Nov 20

ONT6:00 amOntario

10h 53m

1 stop

SAN4:53 pmSan Diego

$344

Find similar

Alaska Airlines

Nov 7

SAN6:02 pmSan Diego

5h 54m

1 stop

ONT11:56 pmOntario

Nov 9

ONT7:20 amOntario

6h 08m

1 stop

SAN1:28 pmSan Diego

$398

Find similar

Delta flights from San Diego to Ontario

Our best Delta deals on San Diego to Ontario flight tickets

Delta

Nov 14

SAN7:05 pmSan Diego

16h 03m

1 stop

ONT11:08 amOntario

Dec 2

ONT6:40 amOntario

16h 05m

1 stop

SAN10:45 pmSan Diego

$267

Find similar

Delta

Nov 16

SAN6:15 amSan Diego

16h 40m

1 stop

ONT10:55 pmOntario

Dec 2

ONT5:49 pmOntario

18h 57m

1 stop

SAN12:46 pmSan Diego

$277

Find similar

Fly from

Fly to

Route

Depart

Return

Price

San DiegoOntario

SAN - ONT

SANONT

San Diego

Wed 10/29

2:34 pm-11:50 pm

1 stop9h 16m

Ontario

Fri 10/31

10:40 pm-3:58 pm

1 stop17h 18m

$141

San DiegoOntario

SAN - ONT

SANONT

San Diego

Wed 10/29

2:34 pm-11:50 pm

1 stop9h 16m

Ontario

Fri 10/31

8:24 am-9:27 am

2 stops25h 03m

$169

San DiegoOntario

SAN - ONT

SANONT

San Diego

Fri 11/14

1:52 pm-8:53 pm

1 stop7h 01m

Ontario

Wed 11/19

4:11 pm-10:59 pm

1 stop6h 48m

$266

San DiegoOntario

SAN - ONT

SANONT

San Diego

Fri 11/14

7:05 pm-11:08 am

1 stop16h 03m

Ontario

Tue 12/2

6:40 am-10:45 pm

1 stop16h 05m

$267

San DiegoOntario

SAN - ONT

SANONT

San Diego

Sun 11/16

6:15 am-10:55 pm

1 stop16h 40m

Ontario

Tue 12/2

5:49 pm-12:46 pm

1 stop18h 57m

$277

San DiegoOntario

SAN - ONT

SANONT

San Diego

Thu 1/8

6:15 am-5:43 pm

1 stop11h 28m

Ontario

Tue 1/13

6:00 am-6:34 pm

1 stop12h 34m

$283

San DiegoOntario

SAN - ONT

SANONT

San Diego

Mon 12/15

1:05 pm-10:49 pm

1 stop9h 44m

Ontario

Wed 12/17

5:05 am-8:45 pm

1 stop15h 40m

$343

San DiegoOntario

SAN - ONT

SANONT

San Diego

Wed 11/19

6:02 pm-11:56 pm

1 stop5h 54m

Ontario

Thu 11/20

6:00 am-4:53 pm

1 stop10h 53m

$344

San DiegoOntario

SAN - ONT

SANONT

San Diego

Sat 12/20

7:30 pm-8:48 am

1 stop13h 18m

Ontario

Thu 12/25

6:20 am-3:24 pm

1 stop9h 04m

$467

San DiegoOntario

SAN - ONT

SANONT

San Diego

Thu 11/6

6:30 am-12:03 pm

1 stop5h 33m

Ontario

Sun 11/9

1:15 pm-6:25 pm

1 stop5h 10m

$699

Flights are sorted by cheapest round-trip flights first.

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How to get the cheapest flight ticket from San Diego to Ontario

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

What is the cheapest day to depart on your flight to Ontario?

The cheapest day to depart on your flight to Ontario is on a Monday when prices can be found for as low as $401. This is often the case because there is less demand to fly during this day of the week. When flying out on a Thursday, the most expensive travel day of the week, you can expect to see flight prices from San Diego to Ontario for around $454.

What is the cheapest time of day to depart on your flight to Ontario?

In the morning is the cheapest time of day to fly from San Diego to Ontario when you can find flight prices for as low as $371. Flying to Ontario in the morning is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $423 on average. Flights to Ontario from San Diego at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

When to book flights from San Diego to Ontario

Are you open to changing your travel dates? Check out the ideal times to fly from San Diego to Ontario according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap San Diego to Ontario (SAN to ONT) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from San Diego to Ontario

Direct flights	None

There are no direct flights from San Diego to Ontario. There are no popular flight routes from San Diego to Ontario.

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How far is San Diego to Ontario by plane?
The distance between San Diego and Ontario is about 97.3 mi. 4h 56m is a normal flight duration for this route.
When did momondo last update prices for flights from San Diego Airport to Ontario Airport?
Prices for flights from San Diego Airport to Ontario Airport are refreshed on a daily basis.
How old do you have to be to fly from San Diego Airport to Ontario Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from San Diego Airport to 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.

Why use momondo?

Why should I use momondo to find a flight deal from San Diego to Ontario?

Finding the right flight to Ontario from San Diego is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Ontario quick and easy, saving you time and money.

Can I find flights from San Diego to Ontario with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for San Diego to Ontario flights to just show those with flexible booking policies.

How can momondo help me find flights from San Diego to Ontario?

Once you have performed a search for San Diego to Ontario flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from San Diego to Ontario right now. Can momondo alert me if prices change?

Price alerts on flights to Ontario from San Diego are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.