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Cheap flights from Ontario to San Diego from $117

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to San Diego departing on 6/30. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

Find the cheapest flights from Ontario to San Diego

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
4:39 pm - 9:12 pm
ONT
-
SAN
4h 33m
1 stop
Frontier Logo
10:07 pm - 8:04 am
SAN
-
ONT
9h 57m
1 stop
$124Frontier
Tue, May 26 - Wed, May 27
Frontier Logo
6:00 am - 11:50 pm
ONT
-
SAN
17h 50m
1 stop
Frontier Logo
9:43 am - 3:08 pm
SAN
-
ONT
5h 25m
1 stop
$126Frontier
Wed, Jun 3 - Wed, Jun 10
Frontier Logo
11:51 am - 8:47 am
ONT
-
SAN
20h 56m
1 stop
Frontier Logo
9:43 am - 7:32 pm
SAN
-
ONT
9h 49m
1 stop
$128Frontier
Mon, Jun 1 - Mon, Jun 8
Frontier Logo
4:39 pm - 12:43 pm
ONT
-
SAN
20h 04m
2 stops
Frontier Logo
9:43 am - 3:08 pm
SAN
-
ONT
5h 25m
1 stop
$142Frontier
Wed, Jun 3 - Wed, Jun 10
Frontier Logo
11:51 am - 8:47 am
ONT
-
SAN
20h 56m
1 stop
Frontier Logo
9:43 am - 7:32 pm
SAN
-
ONT
9h 49m
1 stop
$148Frontier
Mon, Jun 1 - Mon, Jun 8
Frontier Logo
6:00 am - 11:50 pm
ONT
-
SAN
17h 50m
1 stop
Frontier Logo
1:38 pm - 3:08 pm
SAN
-
ONT
25h 30m
2 stops
$150Frontier
Mon, Jun 1 - Mon, Jun 8
Frontier Logo
4:39 pm - 8:42 am
ONT
-
SAN
16h 03m
2 stops
Frontier Logo
10:07 pm - 8:04 am
SAN
-
ONT
9h 57m
1 stop
$164Frontier
Tue, May 26 - Wed, May 27
Frontier Logo
3:30 pm - 3:31 pm
ONT
-
SAN
24h 01m
2 stops
Frontier Logo
9:43 am - 7:32 pm
SAN
-
ONT
9h 49m
1 stop
$175Frontier
Mon, Jun 1 - Mon, Jun 8
Frontier Logo
3:30 pm - 8:47 am
ONT
-
SAN
17h 17m
1 stop
Frontier Logo
1:38 pm - 3:08 pm
SAN
-
ONT
25h 30m
2 stops
$181Frontier
Mon, Jun 1 - Mon, Jun 8
Frontier Logo
3:30 pm - 8:47 am
ONT
-
SAN
17h 17m
1 stop
Frontier Logo
9:43 am - 7:32 pm
SAN
-
ONT
9h 49m
1 stop
$185Frontier
Fri, Jun 5 - Mon, Jun 8

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Frontier flights from Ontario to San Diego

Our best Frontier deals on Ontario to San Diego flight tickets
Frontier
May 26
ONT4:39 pmOntario
4h 33m
1 stop
SAN9:12 pmSan Diego
May 27
SAN10:07 pmSan Diego
9h 57m
1 stop
ONT8:04 amOntario
$124
Frontier
Jun 3
ONT6:00 amOntario
17h 50m
1 stop
SAN11:50 pmSan Diego
Jun 10
SAN9:43 amSan Diego
5h 25m
1 stop
ONT3:08 pmOntario
$126
Frontier
Jun 1
ONT11:51 amOntario
20h 56m
1 stop
SAN8:47 amSan Diego
Jun 8
SAN9:43 amSan Diego
9h 49m
1 stop
ONT7:32 pmOntario
$128

Alaska Airlines flights from Ontario to San Diego

Our best Alaska Airlines deals on Ontario to San Diego flight tickets
Alaska Airlines
Jun 2
ONT3:35 pmOntario
5h 52m
1 stop
SAN9:27 pmSan Diego
Jun 3
SAN9:27 amSan Diego
9h 41m
1 stop
ONT7:08 pmOntario
$373
Alaska Airlines
May 27
ONT3:35 pmOntario
5h 52m
1 stop
SAN9:27 pmSan Diego
May 28
SAN12:12 pmSan Diego
6h 56m
1 stop
ONT7:08 pmOntario
$417
Alaska Airlines
May 30
ONT3:35 pmOntario
5h 52m
1 stop
SAN9:27 pmSan Diego
Jun 6
SAN2:14 pmSan Diego
9h 42m
1 stop
ONT11:56 pmOntario
$418

momondo Fare Finder

 
Customize your flight search to find flights from Ontario to San Diego that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated May 5, 2026.
Use the filters below to find and compare flights from Ontario to San Diego that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Tue 5/26

4:39 pm-9:12 pm

1 stop4h 33m

San Diego

Wed 5/27

10:07 pm-8:04 am

1 stop9h 57m

$124

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Wed 6/3

6:00 am-11:50 pm

1 stop17h 50m

San Diego

Wed 6/10

9:43 am-3:08 pm

1 stop5h 25m

$126

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Mon 6/1

11:51 am-8:47 am

1 stop20h 56m

San Diego

Mon 6/8

9:43 am-7:32 pm

1 stop9h 49m

$128

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Wed 6/3

4:39 pm-12:43 pm

2 stops20h 04m

San Diego

Wed 6/10

9:43 am-3:08 pm

1 stop5h 25m

$142

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Mon 6/1

11:51 am-8:47 am

1 stop20h 56m

San Diego

Mon 6/8

9:43 am-7:32 pm

1 stop9h 49m

$148

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Mon 6/1

6:00 am-11:50 pm

1 stop17h 50m

San Diego

Mon 6/8

1:38 pm-3:08 pm

2 stops25h 30m

$150

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Tue 5/26

4:39 pm-8:42 am

2 stops16h 03m

San Diego

Wed 5/27

10:07 pm-8:04 am

1 stop9h 57m

$164

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Mon 6/1

3:30 pm-3:31 pm

2 stops24h 01m

San Diego

Mon 6/8

9:43 am-7:32 pm

1 stop9h 49m

$175

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Mon 6/1

3:30 pm-8:47 am

1 stop17h 17m

San Diego

Mon 6/8

1:38 pm-3:08 pm

2 stops25h 30m

$181

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Fri 6/5

3:30 pm-8:47 am

1 stop17h 17m

San Diego

Mon 6/8

9:43 am-7:32 pm

1 stop9h 49m

$185

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to San Diego from

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

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

What is the cheapest day to depart on your flight to San Diego?

The cheapest day to depart from Ontario to San Diego is on a Thursday. Travelers who choose to depart for San Diego on a Thursday will often find tickets for as low as $191. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around $457. These prices are subject to change though, so be sure to set up a Price Alert for flights to San Diego.

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

The cheapest time of day to fly to San Diego is in the morning when flights can be purchased for as low as $239. Flights in the evening are often more expensive with an average ticket price of $277.

When to book flights from Ontario to San Diego

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

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

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

Fastest flight time

3h 35m

Direct flights

None
The fastest flight from Ontario to San Diego takes 3h 35m
There are no direct flights from Ontario to San Diego. There are no popular flight routes from Ontario to San Diego.
Search flight deals

Frequently asked questions about flying from Ontario to San Diego

  • How far is Ontario to San Diego by plane?

    A flight from Ontario to San Diego will travel around 97.3 mi. By plane, this route typically takes 3h 35m.

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

    Prices for flights from Ontario Airport to San Diego Airport are updated daily.

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

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Ontario Airport to San Diego Airport.

  • What documentation or ID do you need to fly to San Diego Airport?

    The necessary travel and health documents for your San Diego Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Traveling to a place near San Diego?

Book flights to San Diego if you plan to visit one of these locations
Coronado
Chula Vista
El Cajon
Julian
National City
Poway
San Ysidro
La Mesa
Imperial Beach
Borrego Springs
Lemon Grove
Alpine
Santee

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Ontario to San Diego. momondo saves you time and could save you money on your trip.

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

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

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to San Diego from Ontario.

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

Of course. momondo tracks the price of Ontario to San Diego flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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