ONT - SAN

$41 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
$122
Typical prices: $185-$490
Frontier
Sun 10/7Sun 10/14
ONT - SAN • 1 stop
Cheapest one-way
$41
Typical prices: $138-$258
Frontier
Sun 12/2
ONT - SAN • 1 stop
When to travel
October
Cheapest • 59% price drop
May
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Denver Intl (DEN)
Cheapest • Avg $181 (round-trip)
Phoenix Sky Harbor Intl (PHX)
Shortest trip • 3h 40m (one-way)
Insights
Insights
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Flight Deals

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

Wed, Oct 7 - Wed, Oct 14
Frontier Logo
10:04 am - 4:59 pmONT  Ontario-SAN San Diego
6h 55m1 stop Las Vegas Harry Reid Intl
Frontier Logo
3:14 pm - 7:40 pmSAN  San Diego-ONT Ontario
28h 26m1 stop San Francisco
$122Frontier
Sat, Oct 3 - Mon, Oct 5
Frontier Logo
10:04 am - 4:59 pmONT  Ontario-SAN San Diego
6h 55m1 stop Las Vegas Harry Reid Intl
Frontier Logo
10:28 am - 7:36 pmSAN  San Diego-ONT Ontario
9h 08m1 stop San Francisco
$127Frontier
Wed, Oct 7 - Wed, Oct 14
Frontier Logo
10:04 am - 6:09 pmONT  Ontario-SAN San Diego
8h 05m2 stops Las Vegas Harry Reid Intl San Francisco
Frontier Logo
3:14 pm - 7:40 pmSAN  San Diego-ONT Ontario
28h 26m1 stop San Francisco
$129Frontier
Sat, Oct 3 - Mon, Oct 5
Frontier Logo
10:04 am - 4:59 pmONT  Ontario-SAN San Diego
6h 55m1 stop Las Vegas Harry Reid Intl
Frontier Logo
10:28 am - 9:09 amSAN  San Diego-ONT Ontario
22h 41m2 stops San Francisco Las Vegas Harry Reid Intl
$169Frontier
Tue, Oct 6 - Tue, Oct 13
Frontier Logo
10:04 am - 4:59 pmONT  Ontario-SAN San Diego
6h 55m1 stop Las Vegas Harry Reid Intl
Frontier Logo
2:01 pm - 10:31 amSAN  San Diego-ONT Ontario
20h 30m2 stops Phoenix Sky Harbor Intl Las Vegas Harry Reid Intl
$171Frontier
Sat, Oct 3 - Mon, Oct 5
Frontier Logo
10:04 am - 4:59 pmONT  Ontario-SAN San Diego
6h 55m1 stop Las Vegas Harry Reid Intl
Frontier Logo
9:03 pm - 9:09 amSAN  San Diego-ONT Ontario
12h 06m1 stop Las Vegas Harry Reid Intl
$194Frontier
Tue, Oct 6 - Tue, Oct 13
Frontier Logo
10:04 am - 4:59 pmONT  Ontario-SAN San Diego
6h 55m1 stop Las Vegas Harry Reid Intl
Frontier Logo
6:25 am - 11:50 pmSAN  San Diego-ONT Ontario
17h 25m1 stop Denver Intl
$201Frontier
Thu, Oct 8 - Thu, Oct 15
Frontier Logo
1:38 pm - 7:49 pmONT  Ontario-SAN San Diego
6h 11m1 stop Las Vegas Harry Reid Intl
Frontier Logo
8:34 pm - 7:04 amSAN  San Diego-ONT Ontario
10h 30m1 stop Las Vegas Harry Reid Intl
$203Frontier
Sat, Nov 14 - Wed, Nov 18
Frontier Logo
6:25 am - 3:58 pmONT  Ontario-SAN San Diego
9h 33m1 stop Denver Intl
Frontier Logo
4:53 pm - 11:51 pmSAN  San Diego-ONT Ontario
6h 58m1 stop Denver Intl
$215Frontier
Thu, Oct 1 - Fri, Oct 9
Frontier Logo
12:07 pm - 6:09 pmONT  Ontario-SAN San Diego
6h 02m1 stop San Francisco
Frontier Logo
3:14 pm - 7:40 pmSAN  San Diego-ONT Ontario
4h 26m1 stop San Francisco
$219Frontier
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 from Ontario to San Diego with more confidence.

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

Round-trip flights from Ontario to San Diego start at $122. Prices are below average for this route right now, with typical round-trip fares ranging from $185 to $490. The lowest price found in the past 5 days was $122 on Frontier.

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Key details for Ontario to San Diego flights

Low season

August

Cheapest flight

$41
Best time to beat the crowds with an average 58% drop in price.
Most popular time to fly with an average 11% increase in price.
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 route details based on KAYAK data, including flight times, airports, airlines and booking questions.

  • 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).

  • 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.

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

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

    • Las Vegas Harry Reid Intl (LAS) - 40% of one-stop connections
    • Denver Intl (DEN) - 20% of one-stop connections
    • Phoenix Sky Harbor Intl (PHX) - 20% of one-stop connections
    • San Francisco (SFO) - 20% of one-stop connections

    Las Vegas Harry Reid Intl (LAS) handles the largest share of one-stop connections on this route.

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

    Yes. Being flexible with your travel dates can save you up to 64% on the Ontario to San Diego route. Friday is the cheapest departure day at $180 round-trip on average, while Thursday is the most expensive at $494, a difference of $314. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

  • What popular places can I visit in San Diego?

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

  • 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 40m 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.

  • Have flight prices from Ontario to San Diego changed much recently?

    Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $122 to $719. That means the highest observed fare was about 6x higher than the lowest one.

  • 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 $77, which is 68% below the typical average for this route.

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

    Flying via Phoenix Sky Harbor Intl (PHX) gives the shortest average 1-stop total travel time at 3h 40m, compared with 7h 01m via Las Vegas Harry Reid Intl (LAS) and 12h 33m via Denver Intl (DEN).

  • 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

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 can be flexible, aim for a Friday departure instead of Thursday. On this route, Friday flights average $180 - about $314 less than Thursday (64% savings) based on the last 12 months.
  • If you can choose when to travel, plan your Ontario to San Diego trip for October. Fares historically average $180 round-trip in that month - typically $314 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