Cheap flights from Ontario to San Diego (ONT - SAN) from $158

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/12. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
ONT — SAN
Jun 25 — Jul 21

Cheap flight deals from Ontario to San Diego

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to San Diego (SAN). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated June 20, 2024.

Round-trip from

$288

One-way from

$257
From Ontario to San Diego
One-way flight from Ontario to San Diego

What is the cheapest day to fly round-trip from Ontario to San Diego?

Users have found that leaving on a Wednesday can be a cost-effective option. It’s possible to save up to 141% on your flight compared to booking on days when demand is much higher.

How far in advance should I book a flight from Ontario to San Diego?

Find a great deal and save up to 57% by booking at least 25 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from Ontario to San Diego within the next two weeks, with the cheapest ticket starting at $178.

What is the cheapest month to fly from Ontario to San Diego?

The best pricing can be found in the month of August. Prices to San Diego from Ontario average $209. You can even find prices in August for less than $209, as users have found deals to San Diego from as low as $138. The month of November appears to be one of the more expensive times to travel to San Diego from Ontario. Flying in the targeted month can save you up to 12%.

What is the cheapest time of day to fly from ONT to SAN?

It’s typically best to fly out from Ontario to San Diego at noon. Doing so could potentially save you 18% on the flight price compared to flying in the morning, which is usually more expensive.

Cheap Ontario to San Diego flights in June & July 2024

Find cheap flight options from Ontario to San Diego specifically for the months of June and July 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 3,256,981 searches. Prices were last updated on June 20, 2024.
Scroll through some of the best deals on flights from Ontario to San Diego in 2024. Check back soon for alternative fares.
Sat 7/206:00 amONT - SAN
1 stop17h 59mAlaska Airlines
Sat 7/276:15 amSAN - ONT
1 stop17h 44mAlaska Airlines
Deal found 6/20$362
Wed 7/177:00 amONT - SAN
1 stop16h 59mAlaska Airlines
Wed 7/242:00 pmSAN - ONT
1 stop9h 59mAlaska Airlines
Deal found 6/19$377
Fri 7/264:24 pmONT - SAN
1 stop6h 25mAlaska Airlines
Tue 7/304:55 pmSAN - ONT
1 stop7h 04mAlaska Airlines
Deal found 6/20$382
Fri 7/194:24 pmONT - SAN
1 stop6h 25mAlaska Airlines
Fri 7/264:55 pmSAN - ONT
1 stop7h 04mAlaska Airlines
Deal found 6/19$432
Mon 7/224:24 pmONT - SAN
1 stop7h 35mAlaska Airlines
Fri 8/94:55 pmSAN - ONT
1 stop7h 04mAlaska Airlines
Deal found 6/19$452
Fri 7/194:24 pmONT - SAN
1 stop6h 25mAlaska Airlines
Fri 7/264:55 pmSAN - ONT
1 stop7h 04mAlaska Airlines
Deal found 6/19$472
Fri 7/198:20 pmONT - SAN
1 stop12h 16mAlaska Airlines
Sun 7/218:50 pmSAN - ONT
1 stop12h 15mAlaska Airlines
Deal found 6/19$482
Thu 7/46:10 amONT - SAN
1 stop8h 45mUnited Airlines
Tue 7/91:25 pmSAN - ONT
1 stop9h 20mUnited Airlines
Deal found 6/19$485
Fri 7/196:25 pmONT - SAN
1 stop14h 42mUnited Airlines
Fri 7/261:25 pmSAN - ONT
1 stop9h 20mUnited Airlines
Deal found 6/19$489

Ontario to San Diego 2024 flight deals

Discover exclusive flight deals for travel between Ontario and San Diego in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 3,256,981 searches. Data last updated June 20, 2024.
Scroll through some of the best deals on flights from Ontario to San Diego in 2024. Check back soon for alternative fares.
Thu 9/196:00 amONT - SAN
1 stop8h 32mAlaska Airlines
Sat 9/212:05 pmSAN - ONT
1 stop8h 15mAlaska Airlines
Deal found 6/20$312
Thu 9/1910:10 amONT - SAN
1 stop9h 36mAlaska Airlines
Sat 9/212:05 pmSAN - ONT
1 stop8h 15mAlaska Airlines
Deal found 6/19$332
Sat 7/206:00 amONT - SAN
1 stop17h 59mAlaska Airlines
Sat 7/276:15 amSAN - ONT
1 stop17h 44mAlaska Airlines
Deal found 6/20$362
Wed 7/177:00 amONT - SAN
1 stop16h 59mAlaska Airlines
Wed 7/242:00 pmSAN - ONT
1 stop9h 59mAlaska Airlines
Deal found 6/19$377
Fri 7/264:24 pmONT - SAN
1 stop6h 25mAlaska Airlines
Tue 7/304:55 pmSAN - ONT
1 stop7h 04mAlaska Airlines
Deal found 6/20$382
Wed 10/96:00 amONT - SAN
1 stop10h 57mAlaska Airlines
Thu 10/172:07 pmSAN - ONT
1 stop8h 45mAlaska Airlines
Deal found 6/20$392
Sun 10/66:00 amONT - SAN
1 stop7h 07mAlaska Airlines
Wed 10/92:07 pmSAN - ONT
1 stop8h 45mAlaska Airlines
Deal found 6/19$402
Thu 8/84:24 pmONT - SAN
1 stop7h 35mAlaska Airlines
Sun 8/116:45 amSAN - ONT
1 stop15h 55mAlaska Airlines
Deal found 6/19$422
Fri 7/194:24 pmONT - SAN
1 stop6h 25mAlaska Airlines
Fri 7/264:55 pmSAN - ONT
1 stop7h 04mAlaska Airlines
Deal found 6/19$432

Ontario to San Diego flights leaving soon

Find last-minute flight options from Ontario to San Diego for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 3,256,981 searches. Data last updated June 20, 2024.
Have a look at some of the last-minute flights available departing from Ontario to San Diego. To prevent any unwanted surprises, users should verify their flight info before booking.
Wed 6/265:15 amONT - SAN
1 stop15h 35mUnited Airlines
Thu 6/276:35 amSAN - ONT
1 stop14h 13mUnited Airlines
Deal found 6/19$603
Wed 6/265:15 amONT - SAN
2 stops18h 44mUnited Airlines
Thu 6/276:35 amSAN - ONT
1 stop14h 13mUnited Airlines
Deal found 6/19$678
Sat 6/296:30 amONT - SAN
1 stop8h 41mAmerican Airlines
Sat 6/297:31 pmSAN - ONT
1 stop13h 16mAmerican Airlines
Deal found 6/19$767
Sun 6/306:30 amONT - SAN
1 stop8h 41mAmerican Airlines
Sat 7/69:47 amSAN - ONT
1 stop8h 35mAmerican Airlines
Deal found 6/19$772
Wed 6/266:30 amONT - SAN
1 stop5h 15mAmerican Airlines
Mon 7/14:20 pmSAN - ONT
1 stop5h 20mAmerican Airlines
Deal found 6/20$1,005
Tue 6/259:24 amONT - SAN
1 stop5h 47mAmerican Airlines
Tue 6/257:31 pmSAN - ONT
1 stop13h 16mAmerican Airlines
Deal found 6/19$1,044

One-way flights to San Diego from Ontario

Search for one-way flight options from Ontario to San Diego. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 3,256,981 searches. Data last updated June 20, 2024.
Users traveling one-way from Ontario to San Diego can select one of these great deals. Those seeking round-trip flights from Ontario to San Diego should utilize the search form at the the top of the page.
Tue 11/121:55 pmONT - SAN
1 stop9h 17mUnited Airlines
Deal found 6/19$158
Fri 8/96:00 amONT - SAN
1 stop17h 59mAlaska Airlines
Deal found 6/19$187
Mon 7/227:00 amONT - SAN
1 stop16h 59mAlaska Airlines
Deal found 6/19$197
Fri 8/166:20 amONT - SAN
1 stop17h 35mUnited Airlines
Deal found 6/19$198
Mon 11/46:00 amONT - SAN
1 stop8h 47mAlaska Airlines
Deal found 6/19$201
Fri 7/198:20 pmONT - SAN
1 stop12h 16mAlaska Airlines
Deal found 6/19$207
Sun 7/284:24 pmONT - SAN
1 stop16h 12mAlaska Airlines
Deal found 6/19$217
Thu 7/188:20 pmONT - SAN
1 stop12h 16mAlaska Airlines
Deal found 6/18$257
Wed 7/36:35 pmONT - SAN
1 stop20h 20mUnited Airlines
Deal found 6/19$263

Find flights from Ontario to San Diego within your budget

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, Cheapflights users made 3,256,981 searches. Data last updated June 20, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$312 - $573

Route

Depart

Return

Price

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Thu 9/19

1 stop8h 32m

San Diego

Sat 9/21

1 stop8h 15m

$312

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Thu 9/19

1 stop9h 36m

San Diego

Sat 9/21

1 stop8h 15m

$332

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Sat 7/20

1 stop17h 59m

San Diego

Sat 7/27

1 stop17h 44m

$362

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Wed 7/17

1 stop16h 59m

San Diego

Wed 7/24

1 stop9h 59m

$377

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Wed 10/9

1 stop10h 57m

San Diego

Thu 10/17

1 stop8h 45m

$392

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Thu 7/4

1 stop8h 45m

San Diego

Tue 7/9

1 stop9h 20m

$485

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Fri 7/19

1 stop14h 42m

San Diego

Fri 7/26

1 stop9h 20m

$489

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Wed 7/3

1 stop20h 20m

San Diego

Fri 7/5

1 stop9h 20m

$507

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Fri 9/20

1 stop9h 08m

San Diego

Tue 9/24

1 stop8h 40m

$573

Flights are sorted by cheapest first

Deals found on 6/20

What is the cheapest day to fly from Ontario to San Diego?

Use this chart to determine the cheapest time to fly round-trip from Ontario to San Diego. Price data was last updated on June 16, 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their Ontario to San Diego flight should consider departing on Wednesday mornings when fares are most often at their lowest. Wednesday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
Search Deals

Best time to book a flight from Ontario to San Diego

Have a flexible travel schedule? Discover the best time to fly to San Diego from Ontario with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Temperature and rainfall in San Diego by month

Plan your trip to San Diego by taking into account the average temperature and rainfall totals by month.

SAN

Temperature

57.2 - 71.6 °F

If weather is an important factor for your trip to San Diego, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 71.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 57.2 F).

Reviews of airlines servicing San Diego

Get insights into the airlines that provide service to San Diego. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to San Diego. Reviews last updated June 20, 2024.
Get a feel of what it's like to fly with Alaska Airlines, United Airlines and American Airlines from Ontario to San Diego by reading reviews from past customers. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
8.1
Very good
9,296 reviews

Boarding

8.2

Entertainment

7.3

Food

7.3

Crew

8.6

Overall

8.1

Comfort

7.9

Reviews

1 / 10

We paid $161 for two exit row seats thinking there’d be extra leg room and not be cramped! The price we paid was a rip-off for these seats and the plane was extremely narrow and cramped. The male crew were okay but not super-friendly. When we picked up our luggage at baggage claim, someone ripped my luggage with a knife or blunt object and destroyed it!! I will be filling a claim for this and took pictures. I heard great reviews about this airline but am disappointed.

8.1
Very good
9,296 reviews
8.1
Very good
9,296 reviews

Boarding

8.2

Entertainment

7.3

Food

7.3

Crew

8.6

Overall

8.1

Comfort

7.9

Reviews

1 / 10

We paid $161 for two exit row seats thinking there’d be extra leg room and not be cramped! The price we paid was a rip-off for these seats and the plane was extremely narrow and cramped. The male crew were okay but not super-friendly. When we picked up our luggage at baggage claim, someone ripped my luggage with a knife or blunt object and destroyed it!! I will be filling a claim for this and took pictures. I heard great reviews about this airline but am disappointed.

7.4
Good
10,000 reviews
8.1
Very good
9,296 reviews

Boarding

8.2

Entertainment

7.3

Food

7.3

Crew

8.6

Overall

8.1

Comfort

7.9

Reviews

1 / 10

We paid $161 for two exit row seats thinking there’d be extra leg room and not be cramped! The price we paid was a rip-off for these seats and the plane was extremely narrow and cramped. The male crew were okay but not super-friendly. When we picked up our luggage at baggage claim, someone ripped my luggage with a knife or blunt object and destroyed it!! I will be filling a claim for this and took pictures. I heard great reviews about this airline but am disappointed.

7.3
Good
10,000 reviews
8.1
Very good
9,296 reviews

Boarding

8.2

Entertainment

7.3

Food

7.3

Crew

8.6

Overall

8.1

Comfort

7.9

Reviews

1 / 10

We paid $161 for two exit row seats thinking there’d be extra leg room and not be cramped! The price we paid was a rip-off for these seats and the plane was extremely narrow and cramped. The male crew were okay but not super-friendly. When we picked up our luggage at baggage claim, someone ripped my luggage with a knife or blunt object and destroyed it!! I will be filling a claim for this and took pictures. I heard great reviews about this airline but am disappointed.

Related info for your journey

Find useful and relevant information for your journey from Ontario to San Diego. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
  • Can I find flights from Ontario to San Diego for under $400 on Cheapflights?

    Yes, there are multiple flights from Ontario to San Diego for under $400. The cheapest flight booked recently is on Alaska Airlines for just $312, but on average you can expect to pay $455.

  • Are there last-minute flights available from Ontario to San Diego for under $700?

    There are currently 6+ open flights from Ontario to San Diego within the next 7 days for less than $700.

  • What are the cheapest airlines flying from Ontario to San Diego round-trip?

    Cheapflights users have booked flights from Ontario to San Diego round-trip from $312. Other airlines that can offer you cheap pricing are United Airlines, from $485, and American Airlines, from $573.

  • What are the cheapest airlines to fly from Ontario to San Diego one-way?

    To fly one-way, consider booking your trip with United Airlines, which is currently one of the cheapest options available, starting at $158. Alaska Airlines flights start at $187 while deals on American Airlines start at $288 one-way.

  • What does ONT to SAN mean?

    These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Ontario Airport to San Diego Airport flight would often be abbreviated as a ONT to SAN flight.

  • Can I find deals for flights from Ontario to San Diego that include extra baggage allowance?

    The amount of baggage you can bring on your Ontario to San Diego flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from Ontario to San Diego with specific airlines?

    Yes, Cheapflights allows you to browse and filter Ontario to San Diego flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • Can I find deals for flights from Ontario to San Diego that include hotel bookings?

    Yes. In addition to deals on Ontario to San Diego flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to San Diego?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to San Diego.

  • Can I find deals for business class flights from Ontario to San Diego?

    Yes. Cheapflights offers flight deals from Ontario to San Diego by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • Can I find deals for flights from Ontario to San Diego that allow pets onboard?

    Many airlines flying from Ontario to San Diego offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from Ontario to San Diego?

    Yes, you can often find last-minute deals on Ontario to San Diego flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the Ontario to San Diego flight deals updated?

    The Ontario to San Diego flight deals you see on this page were last updated on 6/20.

  • What is the cheapest month to book a flight from Ontario to San Diego?

    Currently, October is the cheapest month in which you can book a flight from Ontario to San Diego (average of $288). Flying from Ontario to San Diego in July is currently the most expensive (average of $346). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for Ontario to San Diego
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Search flights from Ontario to San Diego by cabin class

Find flights from Ontario to San Diego, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Weekly flight availability from Ontario to San Diego

Explore weekly flight availability from Ontario to San Diego. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated June 20, 2024.
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