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

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

How many flights depart from San Diego to Ontario on average per week?

As of August 2025, 3 flights take off from San Diego and land in Ontario each week. The most common flight departure day for this route is Mon, with 33% of weekly flights taking off on this day.

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 53% 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.

$72 Cheap Flights from San Diego to Ontario in 2025

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Find the cheapest flights from San Diego to Los Angeles

Round-trip

One-way

Last minute

Cheap round-trip flights

1:35 pm - 9:56 pmSAN-ONT

8h 21m1 stop

7:30 pm - 11:34 pmONT-SAN

4h 04m1 stop

$144

Find Deal

Wed, Sep 10 - Thu, Sep 11

6:15 am - 12:43 pmSAN-ONT

6h 28m1 stop

10:28 pm - 7:29 amONT-SAN

9h 01m1 stop

$150

Find Deal

Sat, Sep 20 - Sun, Sep 21

8:00 am - 12:43 pmSAN-ONT

4h 43m1 stop

10:13 pm - 3:58 pmONT-SAN

17h 45m1 stop

$153Frontier

Find Deal

Sat, Sep 6 - Sun, Sep 7

6:35 am - 7:54 pmSAN-ONT

13h 19m1 stop

10:28 pm - 11:48 amONT-SAN

13h 20m1 stop

$154Frontier

Find Deal

Thu, Sep 11 - Sun, Sep 14

7:15 am - 7:54 pmSAN-ONT

12h 39m1 stop

8:00 am - 9:24 pmONT-SAN

13h 24m1 stop

$160Frontier

Find Deal

Tue, Sep 16 - Tue, Sep 23

7:15 am - 2:12 pmSAN-ONT

6h 57m1 stop

1:31 pm - 8:53 pmONT-SAN

7h 22m1 stop

$342Alaska Airlines

Find Deal

Wed, Oct 1 - Wed, Oct 8

6:33 am - 5:54 pmSAN-ONT

11h 21m1 stop

5:03 pm - 5:52 pmONT-SAN

24h 49m1 stop

$435American Airlines

Find Deal

Fri, Jan 2 - Fri, Jan 16

6:15 am - 11:46 pmSAN-ONT

17h 31m1 stop

1:00 pm - 10:45 pmONT-SAN

9h 45m1 stop

$585Delta

Find Deal

Mon, Nov 24 - Fri, Nov 28

5:00 pm - 12:31 pmSAN-ONT

19h 31m1 stop

1:00 pm - 10:45 pmONT-SAN

9h 45m1 stop

$635Delta

Find Deal

Sun, Nov 23 - Fri, Nov 28

12:50 pm - 4:24 pmSAN-ONT

3h 34m1 stop

4:45 pm - 9:52 pmONT-SAN

5h 07m1 stop

$785American Airlines

Find Deal

Sat, Aug 30 - Sun, Sep 14

Frontier flights from San Diego to Ontario

Our best Frontier deals on San Diego to Ontario flight tickets

Frontier

Sep 6

SAN8:00 amSan Diego

4h 43m

1 stop

ONT12:43 pmOntario

Sep 7

ONT10:13 pmOntario

17h 45m

1 stop

SAN3:58 pmSan Diego

$153

Find similar

Frontier

Sep 11

SAN6:35 amSan Diego

13h 19m

1 stop

ONT7:54 pmOntario

Sep 14

ONT10:28 pmOntario

13h 20m

1 stop

SAN11:48 amSan Diego

$154

Find similar

Frontier

Sep 16

SAN7:15 amSan Diego

12h 39m

1 stop

ONT7:54 pmOntario

Sep 23

ONT8:00 amOntario

13h 24m

1 stop

SAN9:24 pmSan Diego

$160

Find similar

Delta flights from San Diego to Ontario

Our best Delta deals on San Diego to Ontario flight tickets

Delta

Nov 24

SAN6:15 amSan Diego

17h 31m

1 stop

ONT11:46 pmOntario

Nov 28

ONT1:00 pmOntario

9h 45m

1 stop

SAN10:45 pmSan Diego

$585

Find similar

Delta

Nov 23

SAN5:00 pmSan Diego

19h 31m

1 stop

ONT12:31 pmOntario

Nov 28

ONT1:00 pmOntario

9h 45m

1 stop

SAN10:45 pmSan Diego

$635

Find similar

Delta

Nov 24

SAN6:15 amSan Diego

9h 59m

1 stop

ONT4:14 pmOntario

Nov 29

ONT6:00 amOntario

12h 46m

1 stop

SAN6:46 pmSan Diego

$645

Find similar

Fly from

Fly to

Route

Depart

Return

Price

San DiegoOntario

SAN - ONT

SANONT

San Diego

Wed 9/10

1:35 pm-9:56 pm

1 stop8h 21m

Ontario

Thu 9/11

7:30 pm-11:34 pm

1 stop4h 04m

$144

San DiegoOntario

SAN - ONT

SANONT

San Diego

Sat 9/20

6:15 am-12:43 pm

1 stop6h 28m

Ontario

Sun 9/21

10:28 pm-7:29 am

1 stop9h 01m

$150

San DiegoOntario

SAN - ONT

SANONT

San Diego

Sat 9/6

8:00 am-12:43 pm

1 stop4h 43m

Ontario

Sun 9/7

10:13 pm-3:58 pm

1 stop17h 45m

$153

San DiegoOntario

SAN - ONT

SANONT

San Diego

Thu 9/11

6:35 am-7:54 pm

1 stop13h 19m

Ontario

Sun 9/14

10:28 pm-11:48 am

1 stop13h 20m

$154

San DiegoOntario

SAN - ONT

SANONT

San Diego

Tue 9/16

7:15 am-7:54 pm

1 stop12h 39m

Ontario

Tue 9/23

8:00 am-9:24 pm

1 stop13h 24m

$160

San DiegoOntario

SAN - ONT

SANONT

San Diego

Wed 10/1

7:15 am-2:12 pm

1 stop6h 57m

Ontario

Wed 10/8

1:31 pm-8:53 pm

1 stop7h 22m

$342

San DiegoOntario

SAN - ONT

SANONT

San Diego

Fri 1/2

6:33 am-5:54 pm

1 stop11h 21m

Ontario

Fri 1/16

5:03 pm-5:52 pm

1 stop24h 49m

$435

San DiegoOntario

SAN - ONT

SANONT

San Diego

Mon 11/24

6:15 am-11:46 pm

1 stop17h 31m

Ontario

Fri 11/28

1:00 pm-10:45 pm

1 stop9h 45m

$585

San DiegoOntario

SAN - ONT

SANONT

San Diego

Sun 11/23

5:00 pm-12:31 pm

1 stop19h 31m

Ontario

Fri 11/28

1:00 pm-10:45 pm

1 stop9h 45m

$635

San DiegoOntario

SAN - ONT

SANONT

San Diego

Sat 8/30

12:50 pm-4:24 pm

1 stop3h 34m

Ontario

Sun 9/14

4:45 pm-9:52 pm

1 stop5h 07m

$785

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

Other information

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

Best Price Found	$72
Fastest flight time	3h 34m
Direct flights	None
Airports in Ontario	1 airport

The best one-way flight to Ontario from San Diego in the past 72 hours is $72. The best round-trip flight deal from San Diego to Ontario found on momondo in the last 72 hours is $144.

The fastest flight from San Diego to Ontario takes 3h 34m

There are no direct flights from San Diego to Ontario. Popular non-direct route for this connection is San Diego Airport - Ontario Airport.

There is 1 airport near Ontario: Ontario (ONT)

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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. 3h 34m 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.