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Cheap flights from Ontario to San Diego from $76

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 5/16. 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
6:00 am - 11:50 pm
ONT
-
SAN
17h 50m
1 stop
Frontier Logo
9:59 pm - 3:44 pm
SAN
-
ONT
17h 45m
1 stop
$153Frontier
Sat, May 9 - Mon, May 11
Frontier Logo
8:17 pm - 8:52 pm
ONT
-
SAN
24h 35m
1 stop
Frontier Logo
9:59 pm - 3:44 pm
SAN
-
ONT
17h 45m
1 stop
$159Frontier
Fri, May 15 - Tue, May 19
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
$171Frontier
Tue, May 26 - Fri, May 29
Frontier Logo
6:00 am - 8:42 am
ONT
-
SAN
26h 42m
1 stop
Frontier Logo
9:59 pm - 10:05 am
SAN
-
ONT
12h 06m
2 stops
$175Frontier
Sat, May 9 - Mon, May 11
Frontier Logo
6:00 am - 11:50 pm
ONT
-
SAN
17h 50m
1 stop
Frontier Logo
9:37 am - 7:08 am
SAN
-
ONT
21h 31m
2 stops
$182Frontier
Sat, May 16 - Sat, May 23
Frontier Logo
6:00 am - 11:50 pm
ONT
-
SAN
17h 50m
1 stop
Frontier Logo
7:15 pm - 11:06 am
SAN
-
ONT
15h 51m
1 stop
$183Frontier
Sat, May 16 - Sat, May 23
Frontier Logo
1:33 pm - 8:58 pm
ONT
-
SAN
7h 25m
1 stop
Frontier Logo
8:29 pm - 3:08 pm
SAN
-
ONT
18h 39m
1 stop
$193Frontier
Tue, Jun 16 - Fri, Jun 19
Frontier Logo
8:17 pm - 9:04 pm
ONT
-
SAN
24h 47m
2 stops
Frontier Logo
9:59 pm - 3:44 pm
SAN
-
ONT
17h 45m
1 stop
$207Frontier
Fri, May 15 - Tue, May 19
Frontier Logo
8:17 pm - 8:52 pm
ONT
-
SAN
24h 35m
1 stop
Frontier Logo
10:07 pm - 8:04 am
SAN
-
ONT
9h 57m
1 stop
$219Frontier
Fri, May 15 - Fri, May 22
Frontier Logo
3:34 pm - 8:58 pm
ONT
-
SAN
5h 24m
1 stop
Frontier Logo
8:29 pm - 11:13 am
SAN
-
ONT
14h 44m
2 stops
$232Frontier
Tue, Jun 16 - Fri, Jun 19

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American Airlines flights from Ontario to San Diego

Our best American Airlines deals on Ontario to San Diego flight tickets
American Airlines
May 11
ONT7:35 pmOntario
20h 12m
1 stop
SAN3:47 pmSan Diego
May 18
SAN7:20 pmSan Diego
13h 19m
1 stop
ONT8:39 amOntario
$253
American Airlines
May 6
ONT6:15 amOntario
9h 30m
1 stop
SAN3:45 pmSan Diego
May 21
SAN6:25 amSan Diego
11h 57m
1 stop
ONT6:22 pmOntario
$404
American Airlines
May 15
ONT12:19 pmOntario
20h 19m
1 stop
SAN8:38 amSan Diego
May 22
SAN7:15 pmSan Diego
40h 50m
1 stop
ONT12:05 pmOntario
$414

Alaska Airlines flights from Ontario to San Diego

Our best Alaska Airlines deals on Ontario to San Diego flight tickets
Alaska Airlines
May 13
ONT3:35 pmOntario
5h 52m
1 stop
SAN9:27 pmSan Diego
May 20
SAN9:27 amSan Diego
9h 41m
1 stop
ONT7:08 pmOntario
$343
Alaska Airlines
May 5
ONT12:48 pmOntario
20h 22m
1 stop
SAN9:10 amSan Diego
May 6
SAN6:02 pmSan Diego
5h 46m
1 stop
ONT11:48 pmOntario
$367
Alaska Airlines
May 20
ONT3:35 pmOntario
21h 00m
1 stop
SAN12:35 pmSan Diego
May 26
SAN9:27 amSan Diego
9h 41m
1 stop
ONT7:08 pmOntario
$432

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 April 19, 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

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Sat 5/9

6:00 am-11:50 pm

1 stop17h 50m

San Diego

Mon 5/11

9:59 pm-3:44 pm

1 stop17h 45m

$153

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Fri 5/15

8:17 pm-8:52 pm

1 stop24h 35m

San Diego

Tue 5/19

9:59 pm-3:44 pm

1 stop17h 45m

$159
Quickest round-trip

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Tue 5/26

4:39 pm-9:12 pm

1 stop4h 33m

San Diego

Fri 5/29

10:07 pm-8:04 am

1 stop9h 57m

$171

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Sat 5/9

6:00 am-8:42 am

1 stop26h 42m

San Diego

Mon 5/11

9:59 pm-10:05 am

2 stops12h 06m

$175

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Sat 5/16

6:00 am-11:50 pm

1 stop17h 50m

San Diego

Sat 5/23

9:37 am-7:08 am

2 stops21h 31m

$182

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Sat 5/16

6:00 am-11:50 pm

1 stop17h 50m

San Diego

Sat 5/23

7:15 pm-11:06 am

1 stop15h 51m

$183

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Tue 6/16

1:33 pm-8:58 pm

1 stop7h 25m

San Diego

Fri 6/19

8:29 pm-3:08 pm

1 stop18h 39m

$193

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Fri 5/15

8:17 pm-9:04 pm

2 stops24h 47m

San Diego

Tue 5/19

9:59 pm-3:44 pm

1 stop17h 45m

$207

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Fri 5/15

8:17 pm-8:52 pm

1 stop24h 35m

San Diego

Fri 5/22

10:07 pm-8:04 am

1 stop9h 57m

$219

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Tue 6/16

3:34 pm-8:58 pm

1 stop5h 24m

San Diego

Fri 6/19

8:29 pm-11:13 am

2 stops14h 44m

$232

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 $189. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around $437. 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 20m

Direct flights

None
The fastest flight from Ontario to San Diego takes 3h 20m
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 20m.

  • 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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