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Cheap flights from Ontario to San Diego from $64

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 6/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Ontario to San Diego

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
8:17 pm - 11:12 pm
ONT
-
SAN
26h 55m
1 stop
Frontier Logo
9:59 pm - 3:44 pm
SAN
-
ONT
17h 45m
1 stop
$142Frontier
Mon, May 11 - Mon, May 18
Frontier Logo
11:36 am - 9:04 pm
ONT
-
SAN
9h 28m
1 stop
Frontier Logo
9:59 pm - 3:44 pm
SAN
-
ONT
17h 45m
1 stop
$159Frontier
Mon, May 11 - Mon, May 18
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
$173Frontier
Mon, May 11 - Mon, May 18
Frontier Logo
8:17 pm - 11:50 pm
ONT
-
SAN
27h 33m
2 stops
Frontier Logo
6:25 am - 10:05 am
SAN
-
ONT
27h 40m
1 stop
$175Frontier
Fri, May 8 - Fri, May 15
Frontier Logo
8:17 pm - 8:52 pm
ONT
-
SAN
24h 35m
1 stop
Frontier Logo
6:25 am - 10:05 am
SAN
-
ONT
27h 40m
1 stop
$193Frontier
Fri, May 8 - Fri, May 15
Frontier Logo
11:36 am - 11:50 pm
ONT
-
SAN
12h 14m
2 stops
Frontier Logo
9:59 pm - 3:44 pm
SAN
-
ONT
17h 45m
1 stop
$208Frontier
Mon, May 11 - Mon, May 18
Frontier Logo
12:59 am - 2:24 pm
ONT
-
SAN
13h 25m
2 stops
Frontier Logo
9:00 pm - 8:04 am
SAN
-
ONT
11h 04m
1 stop
$210Frontier
Fri, May 1 - Sun, May 3
Frontier Logo
6:00 am - 11:50 pm
ONT
-
SAN
17h 50m
1 stop
Frontier Logo
10:07 pm - 8:04 am
SAN
-
ONT
9h 57m
1 stop
$223Frontier
Fri, May 29 - Sat, May 30
American Airlines Logo
7:35 pm - 3:47 pm
ONT
-
SAN
20h 12m
1 stop
American Airlines Logo
7:20 pm - 4:22 pm
SAN
-
ONT
21h 02m
1 stop
$243American Airlines
Mon, May 11 - Mon, May 18
Frontier Logo
12:59 am - 8:04 pm
ONT
-
SAN
19h 05m
1 stop
Frontier Logo
7:20 am - 3:34 pm
SAN
-
ONT
8h 14m
1 stop
$257Frontier
Fri, May 1 - Sun, May 3

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
21h 02m
1 stop
ONT4:22 pmOntario
$243
American Airlines
May 19
ONT9:24 amOntario
9h 04m
1 stop
SAN6:28 pmSan Diego
May 22
SAN7:15 pmSan Diego
40h 50m
1 stop
ONT12:05 pmOntario
$304
American Airlines
May 19
ONT4:52 pmOntario
25h 33m
1 stop
SAN6:25 pmSan Diego
May 22
SAN7:15 pmSan Diego
40h 50m
1 stop
ONT12:05 pmOntario
$364

Alaska Airlines flights from Ontario to San Diego

Our best Alaska Airlines deals on Ontario to San Diego flight tickets
Alaska Airlines
May 5
ONT12:48 pmOntario
20h 22m
1 stop
SAN9:10 amSan Diego
May 6
SAN5:17 pmSan Diego
18h 51m
1 stop
ONT12:08 pmOntario
$338
Alaska Airlines
May 13
ONT3:35 pmOntario
5h 52m
1 stop
SAN9:27 pmSan Diego
May 16
SAN12:12 pmSan Diego
6h 56m
1 stop
ONT7:08 pmOntario
$343
Alaska Airlines
May 5
ONT12:48 pmOntario
20h 22m
1 stop
SAN9:10 amSan Diego
May 6
SAN2:04 pmSan Diego
9h 44m
1 stop
ONT11:48 pmOntario
$367

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 13, 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

Mon 5/11

8:17 pm-11:12 pm

1 stop26h 55m

San Diego

Mon 5/18

9:59 pm-3:44 pm

1 stop17h 45m

$142

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Mon 5/11

11:36 am-9:04 pm

1 stop9h 28m

San Diego

Mon 5/18

9:59 pm-3:44 pm

1 stop17h 45m

$159

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Mon 5/11

8:17 pm-9:04 pm

2 stops24h 47m

San Diego

Mon 5/18

9:59 pm-3:44 pm

1 stop17h 45m

$173

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Fri 5/8

8:17 pm-11:50 pm

2 stops27h 33m

San Diego

Fri 5/15

6:25 am-10:05 am

1 stop27h 40m

$175

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Fri 5/8

8:17 pm-8:52 pm

1 stop24h 35m

San Diego

Fri 5/15

6:25 am-10:05 am

1 stop27h 40m

$193

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Mon 5/11

11:36 am-11:50 pm

2 stops12h 14m

San Diego

Mon 5/18

9:59 pm-3:44 pm

1 stop17h 45m

$208
Quickest round-trip

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Fri 5/1

12:59 am-2:24 pm

2 stops13h 25m

San Diego

Sun 5/3

9:00 pm-8:04 am

1 stop11h 04m

$210

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Fri 5/29

6:00 am-11:50 pm

1 stop17h 50m

San Diego

Sat 5/30

10:07 pm-8:04 am

1 stop9h 57m

$223

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Mon 5/11

7:35 pm-3:47 pm

1 stop20h 12m

San Diego

Mon 5/18

7:20 pm-4:22 pm

1 stop21h 02m

$243

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Fri 5/1

12:59 am-8:04 pm

1 stop19h 05m

San Diego

Sun 5/3

7:20 am-3:34 pm

1 stop8h 14m

$257

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 $236. Flights in the afternoon are often more expensive with an average ticket price of $269.

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 40m

Direct flights

None
The fastest flight from Ontario to San Diego takes 3h 40m
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 40m.

  • 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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