ONT - SAN

$72 Find Cheap Flights from Ontario to San Diego - Compare and Save

1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$91
Typical prices: $186-$490
Frontier
Sat 11/24Sat 12/1
ONT - SAN • 1 stop
Cheapest one-way
$72
Typical prices: $134-$258
Frontier
Sat 12/8
ONT - SAN • 2 stops
When to travel
January
Cheapest • 60% price drop
May
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Denver Intl (DEN)
Cheapest • Avg $181 (round-trip)
Las Vegas Harry Reid Intl (LAS)
Shortest trip • 3h 12m (one-way)
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Cheap Flights from Ontario to San Diego (ONT-SAN)

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ontario to San Diego

Tue, Nov 24 - Tue, Dec 1
Frontier Logo
4:13 pm - 7:55 amONT  Ontario-SAN San Diego
15h 42m1 stop Las Vegas Harry Reid Intl
Frontier Logo
12:32 pm - 6:11 pmSAN  San Diego-ONT Ontario
5h 39m1 stop Las Vegas Harry Reid Intl
$91Frontier
Tue, Dec 8 - Wed, Dec 16
Frontier Logo
8:44 am - 6:16 pmONT  Ontario-SAN San Diego
9h 32m2 stops Las Vegas Harry Reid Intl San Francisco
Frontier Logo
8:57 am - 6:31 pmSAN  San Diego-ONT Ontario
9h 34m1 stop Las Vegas Harry Reid Intl
$109Frontier
Tue, Nov 17 - Sun, Nov 22
Frontier Logo
6:30 am - 3:58 pmONT  Ontario-SAN San Diego
9h 28m1 stop Denver Intl
Frontier Logo
8:50 am - 7:36 pmSAN  San Diego-ONT Ontario
10h 46m1 stop Las Vegas Harry Reid Intl
$123Frontier
Tue, Dec 8 - Mon, Dec 14
Frontier Logo
11:30 am - 11:58 pmONT  Ontario-SAN San Diego
12h 28m1 stop Denver Intl
Frontier Logo
11:14 am - 12:20 amSAN  San Diego-ONT Ontario
13h 06m1 stop Denver Intl
$127Frontier
Tue, Dec 8 - Wed, Dec 16
Frontier Logo
11:30 am - 11:58 pmONT  Ontario-SAN San Diego
12h 28m1 stop Denver Intl
Frontier Logo
8:57 am - 6:31 pmSAN  San Diego-ONT Ontario
9h 34m1 stop Las Vegas Harry Reid Intl
$129Frontier
Tue, Nov 24 - Tue, Dec 1
Frontier Logo
10:40 pm - 7:55 amONT  Ontario-SAN San Diego
9h 15m1 stop Las Vegas Harry Reid Intl
Frontier Logo
7:51 pm - 6:11 pmSAN  San Diego-ONT Ontario
22h 20m2 stops San Francisco Las Vegas Harry Reid Intl
$133Frontier
Tue, Dec 8 - Wed, Dec 16
Frontier Logo
8:44 am - 6:16 pmONT  Ontario-SAN San Diego
9h 32m2 stops Las Vegas Harry Reid Intl San Francisco
Frontier Logo
9:58 am - 6:31 pmSAN  San Diego-ONT Ontario
8h 33m2 stops Phoenix Sky Harbor Intl Las Vegas Harry Reid Intl
$134Frontier
Tue, Dec 8 - Mon, Dec 14
Frontier Logo
8:44 am - 9:13 amONT  Ontario-SAN San Diego
24h 29m2 stops Las Vegas Harry Reid Intl Phoenix Sky Harbor Intl
Frontier Logo
11:14 am - 12:20 amSAN  San Diego-ONT Ontario
13h 06m1 stop Denver Intl
$135Frontier
Tue, Nov 17 - Sun, Nov 22
Frontier Logo
6:30 am - 3:58 pmONT  Ontario-SAN San Diego
9h 28m1 stop Denver Intl
Frontier Logo
1:02 pm - 7:20 amSAN  San Diego-ONT Ontario
18h 18m2 stops Phoenix Sky Harbor Intl Las Vegas Harry Reid Intl
$139Frontier
Thu, Dec 3 - Sun, Dec 6
Frontier Logo
8:00 am - 6:10 pmONT  Ontario-SAN San Diego
10h 10m2 stops Las Vegas Harry Reid Intl San Francisco
Frontier Logo
8:57 am - 6:31 pmSAN  San Diego-ONT Ontario
9h 34m1 stop Las Vegas Harry Reid Intl
$149Frontier
Booking Insights

Price, demand and travel trends for Ontario to San Diego flights

Use KAYAK data on prices, travel dates, airlines and seasonal trends to compare options and book flights with more confidence.

How much is a round-trip flight from Ontario to San Diego?

Round-trip flights from Ontario to San Diego typically range from $186 to $490. The lowest price found in the past 5 days was $91, on Frontier.

Find deals

Key details for Ontario to San Diego flights

Cheapest flight

$72
The most popular month to fly with an average 17% increase in travelers.
One-way flight from Ontario to San Diego

When to book flights from Ontario to San Diego

Are your dates flexible? Find out the best times to travel from Ontario to San Diego based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price

Your Ontario to San Diego flight questions, answered

Find helpful answers about this route, including flight times, airports, airlines and booking tips.

  • What cabin classes can I book on flights from Ontario to San Diego?

    Only Economy Class is available on flights from Ontario to San Diego.

  • How long is a flight from Ontario to San Diego?

    There are currently no nonstop flights available from Ontario to San Diego. Flights with 1 layover take between 3h 12m and 21h 31m in total, depending on the connection.

  • Do I need a passport to fly from Ontario to San Diego?

    No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID or another TSA-accepted form of identification.

  • How are flight prices from Ontario to San Diego looking right now?

    One-way fares from Ontario to San Diego are currently lower than usual. Average one-way flight prices are about $96, which is 60% below the typical average for this route.

  • What car rental options are available at San Diego Airport (SAN)?

    San Diego Airport (SAN) hosts 5 major car rental companies, with daily rates starting from around $14 for economy cars. Top options include:

    • Dollar
    • Payless
    • Europcar
    • Thrifty
    • Fox

  • Which airports can I use when flying from Ontario to San Diego?

    Flights from Ontario to San Diego usually depart from Ontario (ONT) and arrive at San Diego (SAN).

  • Which airports do connecting flights from Ontario to San Diego pass through?

    One-stop flights from Ontario to San Diego most commonly connect through:

    • Denver Intl (DEN) - 25% of one-stop connections
    • Las Vegas Harry Reid Intl (LAS) - 25% of one-stop connections
    • Phoenix Sky Harbor Intl (PHX) - 25% of one-stop connections
    • San Francisco (SFO) - 25% of one-stop connections

  • Can I save money by using flexible dates for flights from Ontario to San Diego?

    Yes. Flexible dates can save you up to 9% on flights from Ontario to San Diego. Monday is the cheapest departure day at $450 round-trip on average, while Thursday is the most expensive at $494, a difference of $44.

    KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

  • How much time can I save by choosing a different layover airport from Ontario to San Diego?

    Flying via Las Vegas Harry Reid Intl (LAS) gives the shortest average 1-stop total travel time at 3h 12m, compared with 3h 40m via Phoenix Sky Harbor Intl (PHX) and 12h 33m via Denver Intl (DEN).

  • What popular places can I visit in San Diego?

    Some of the most popular sights in San Diego are Gaslamp Quarter, SeaWorld San Diego and San Diego Convention Center. These are among the most viewed places in San Diego on KAYAK.

Your guide to booking Ontario to San Diego flights

Get tips on when to book, when to fly and what to know before your trip.
  • If your dates are flexible, aim for a Monday departure and avoid flying on Thursday. On this route, Monday flights average $450, about $44 less than Thursday fares (9% savings) based on the last 12 months.
  • If you can choose when to travel, plan your Ontario to San Diego trip for January. Fares historically average $181 round-trip in that month - typically $313 less than the most expensive month, which is June (based on the last 12 months).
  • If you're arriving late at night and need somewhere to stay, check out these hotels close to San Diego Airport.

    • Courtyard by Marriott San Diego Downtown Little Italy
    • Bay Club Hotel & Marina
    • Sheraton San Diego Resort

More options for your flight from Ontario to San Diego

Complete your trip to San Diego with a hotel stay or car rental

Car rentals in San Diego
Hotels in San Diego
Vacations in San Diego