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

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

What airlines fly to Ontario?

United Airlines, Delta and Spirit 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 55% 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.

$62 Cheap Flights from San Diego to Ontario in 2025/26

1 adult

0 bags

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from San Diego to Los Angeles

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

4:01 pm - 10:59 am

SAN

ONT

18h 58m1 stop

6:00 am - 3:29 pm

ONT

SAN

9h 29m1 stop

$204Alaska Airlines

Thu, Jan 22 - Sun, Feb 1

6:15 am - 11:56 pm

SAN

ONT

17h 41m1 stop

4:03 pm - 1:19 pm

ONT

SAN

21h 16m1 stop

$225Alaska Airlines

Fri, Jan 23 - Sun, Feb 1

1:06 pm - 5:22 pm

SAN

ONT

4h 16m1 stop

6:00 am - 12:38 pm

ONT

SAN

6h 38m1 stop

$235Frontier

Thu, Dec 18 - Mon, Dec 22

6:15 am - 3:08 pm

SAN

ONT

8h 53m1 stop

4:03 pm - 10:07 am

ONT

SAN

18h 04m1 stop

$263Alaska Airlines

Thu, Jan 8 - Mon, Jan 12

6:15 am - 3:08 pm

SAN

ONT

8h 53m1 stop

6:00 am - 8:58 pm

ONT

SAN

14h 58m1 stop

$264Alaska Airlines

Fri, Jan 9 - Sun, Jan 11

6:15 am - 11:32 pm

SAN

ONT

17h 17m1 stop

11:30 am - 12:04 am

ONT

SAN

12h 34m1 stop

$280Alaska Airlines

Sat, Mar 14 - Sat, Mar 21

8:39 am - 10:44 pm

SAN

ONT

14h 05m1 stop

6:14 am - 11:03 pm

ONT

SAN

16h 49m1 stop

$284Alaska Airlines

Tue, Feb 24 - Fri, Mar 13

9:15 pm - 12:08 pm

SAN

ONT

14h 53m1 stop

6:05 pm - 12:07 am

ONT

SAN

6h 02m1 stop

$302Alaska Airlines

Mon, Jan 5 - Tue, Jan 6

6:15 am - 10:44 pm

SAN

ONT

16h 29m1 stop

6:55 pm - 9:54 am

ONT

SAN

14h 59m1 stop

$309Alaska Airlines

Tue, Mar 17 - Fri, Mar 20

8:00 pm - 12:17 pm

SAN

ONT

16h 17m1 stop

6:00 am - 3:02 pm

ONT

SAN

9h 02m1 stop

$423United Airlines

Mon, Dec 15 - Wed, Dec 17

Alaska Airlines flights from San Diego to Ontario

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

Alaska Airlines

Jan 22

SAN4:01 pmSan Diego

18h 58m

1 stop

ONT10:59 amOntario

Feb 1

ONT6:00 amOntario

9h 29m

1 stop

SAN3:29 pmSan Diego

$204

Find similar

Alaska Airlines

Jan 23

SAN6:15 amSan Diego

17h 41m

1 stop

ONT11:56 pmOntario

Feb 1

ONT4:03 pmOntario

21h 16m

1 stop

SAN1:19 pmSan Diego

$225

Find similar

Alaska Airlines

Jan 8

SAN6:15 amSan Diego

8h 53m

1 stop

ONT3:08 pmOntario

Jan 12

ONT4:03 pmOntario

18h 04m

1 stop

SAN10:07 amSan Diego

$263

Find similar

United Airlines flights from San Diego to Ontario

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

United Airlines

Dec 15

SAN8:00 pmSan Diego

16h 17m

1 stop

ONT12:17 pmOntario

Dec 17

ONT6:00 amOntario

9h 02m

1 stop

SAN3:02 pmSan Diego

$423

Find similar

United Airlines

Dec 15

SAN8:00 pmSan Diego

16h 17m

1 stop

ONT12:17 pmOntario

Dec 17

ONT1:43 pmOntario

10h 32m

1 stop

SAN12:15 amSan Diego

$448

Find similar

United Airlines

Dec 13

SAN6:15 amSan Diego

16h 34m

1 stop

ONT10:49 pmOntario

Dec 15

ONT1:50 pmOntario

18h 16m

1 stop

SAN8:06 amSan Diego

$458

Find similar

Fly from

Fly to

Route

Depart

Return

Price

San DiegoOntario

SAN - ONT

SANONT

San Diego

Thu 1/22

4:01 pm-10:59 am

1 stop18h 58m

Ontario

Sun 2/1

6:00 am-3:29 pm

1 stop9h 29m

$204

San DiegoOntario

SAN - ONT

SANONT

San Diego

Fri 1/23

6:15 am-11:56 pm

1 stop17h 41m

Ontario

Sun 2/1

4:03 pm-1:19 pm

1 stop21h 16m

$225

San DiegoOntario

SAN - ONT

SANONT

San Diego

Thu 12/18

1:06 pm-5:22 pm

1 stop4h 16m

Ontario

Mon 12/22

6:00 am-12:38 pm

1 stop6h 38m

$235

San DiegoOntario

SAN - ONT

SANONT

San Diego

Thu 1/8

6:15 am-3:08 pm

1 stop8h 53m

Ontario

Mon 1/12

4:03 pm-10:07 am

1 stop18h 04m

$263

San DiegoOntario

SAN - ONT

SANONT

San Diego

Fri 1/9

6:15 am-3:08 pm

1 stop8h 53m

Ontario

Sun 1/11

6:00 am-8:58 pm

1 stop14h 58m

$264

San DiegoOntario

SAN - ONT

SANONT

San Diego

Sat 3/14

6:15 am-11:32 pm

1 stop17h 17m

Ontario

Sat 3/21

11:30 am-12:04 am

1 stop12h 34m

$280

San DiegoOntario

SAN - ONT

SANONT

San Diego

Tue 2/24

8:39 am-10:44 pm

1 stop14h 05m

Ontario

Fri 3/13

6:14 am-11:03 pm

1 stop16h 49m

$284

San DiegoOntario

SAN - ONT

SANONT

San Diego

Mon 1/5

9:15 pm-12:08 pm

1 stop14h 53m

Ontario

Tue 1/6

6:05 pm-12:07 am

1 stop6h 02m

$302

San DiegoOntario

SAN - ONT

SANONT

San Diego

Tue 3/17

6:15 am-10:44 pm

1 stop16h 29m

Ontario

Fri 3/20

6:55 pm-9:54 am

1 stop14h 59m

$309

San DiegoOntario

SAN - ONT

SANONT

San Diego

Mon 12/15

8:00 pm-12:17 pm

1 stop16h 17m

Ontario

Wed 12/17

6:00 am-3:02 pm

1 stop9h 02m

$423

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Fastest flight time	7h 43m
Direct flights	None

The fastest flight from San Diego to Ontario takes 7h 43m

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

Search flight deals

How far is San Diego to Ontario by plane?
The distance between San Diego and Ontario is about 97.3 mi. 4h 16m 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.