San Diego

$101+ Cheap flights from Ontario to San Diego (ONT - SAN)

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 1/13. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SAN
Nov 5 — Nov 121
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1. Tell us where you want to go
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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 October 31, 2024.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$222
(Alaska Airlines)

One-way from

$101
(Alaska Airlines)
Provider with most accurate pricing for Ontario-San Diego flight deals.
Provider most trusted by Cheapflights users for Ontario-San Diego flights.
From Ontario to San Diego
One-way flight from Ontario to San Diego

Find flight deals from Ontario to San Diego

Cheapest flights from Ontario to San Diego
Explore the most affordable flight options available from Ontario to San Diego. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 31, 2024.

This Alaska Airlines deal was found by Cheapflights users on 10/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/58:55 pmONT - SAN
1 stop11h 55mAlaska Airlines
Sat 12/76:15 amSAN - ONT
1 stop14h 49mAlaska Airlines
Deal found 10/31$237
This United Airlines deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/255:05 amONT - SAN
1 stop12h 23mUnited Airlines
Mon 12/95:15 pmSAN - ONT
1 stop6h 43mUnited Airlines
Deal found 10/30$369
This American Airlines deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/146:10 amONT - SAN
1 stop12h 13mAmerican Airlines
Sat 12/219:58 amSAN - ONT
1 stop12h 04mAmerican Airlines
Deal found 10/30$492

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 2,570,725 searches. Data last updated October 31, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Mon 1/13

6:00 am-12:51 pm

1 stop6h 51m

$101

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Mon 11/25

5:40 am-2:42 pm

1 stop9h 02m

$172

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Thu 11/28

1:55 pm-8:37 am

1 stop18h 42m

$237

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Fri 1/10

4:06 pm-11:59 pm

1 stop7h 53m

San Diego

Sun 2/2

6:20 am-3:16 pm

1 stop8h 56m

$222

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Mon 11/25

5:05 am-5:28 pm

1 stop12h 23m

San Diego

Mon 12/9

5:15 pm-11:58 pm

1 stop6h 43m

$369

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Sat 12/14

6:10 am-6:23 pm

1 stop12h 13m

San Diego

Sat 12/21

9:58 am-10:02 pm

1 stop12h 04m

$492

Flights are sorted by cheapest first

Deals found on 10/31

Compare providers for flights from Ontario to San Diego

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to San Diego in October.
ProviderPrice AccuracyTrust Score*Cancellation Policy
ExpediaPrice Accuracy1 starTrust Score*3 starsCancellation PolicyAirline Policy
FlightHubPrice Accuracy3 starsTrust Score*3 starsCancellation PolicyAirline Policy
eDreamsPrice Accuracy3 starsTrust Score*3 starsCancellation PolicyAirline Policy

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Ontario-San Diego flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-San Diego flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-San Diego flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-San Diego flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-San Diego flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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.

Travel insights for flights from Ontario to San Diego

Get recent, data-driven insights about flights from Ontario to San Diego including ideal travel times, pricing trends, and more.

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

Currently, September is the cheapest month in which you can book a flight from Ontario to San Diego (average of $266). Flying from Ontario to San Diego in March is currently the most expensive (average of $338). 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.

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

Find hourly flight availability from Ontario to San Diego. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 31, 2024.

It’s typically best to fly out from Ontario to San Diego in the morning. Doing so could potentially save you 40% on the flight price compared to flying at noon, which is usually more expensive.

Rainfall in San Diego by month

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

In terms of precipitation, rainfall in San Diego ranges from 0.0 - 2.3 inches per month. February is typically the wettest month, when rainfall can reach 2.3 in. July is typically the driest time to visit San Diego when rainfall is around 0.0 in.

Temperature in San Diego by month

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

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 October 31, 2024.
Get a feel of what it's like to fly with Alaska Airlines and United 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.
8.0
Very good
9,420 reviews

Boarding

8.2

Crew

8.6

Comfort

7.9

Food

7.2

Overall

8.0

Entertainment

7.1

Reviews

1 / 10

A/C was not working on the ground so it was 110 degrees on the plane when we boarded and we sat there for almost 40 minutes because Austin’s gate system has not kept up with growth. Not Alaska’s fault 100% but it was miserable.

8.0
Very good
9,420 reviews
8.0
Very good
9,420 reviews

Boarding

8.2

Crew

8.6

Comfort

7.9

Food

7.2

Overall

8.0

Entertainment

7.1

Reviews

1 / 10

A/C was not working on the ground so it was 110 degrees on the plane when we boarded and we sat there for almost 40 minutes because Austin’s gate system has not kept up with growth. Not Alaska’s fault 100% but it was miserable.

8.0
Very good
8,835 reviews
8.0
Very good
9,420 reviews

Boarding

8.2

Crew

8.6

Comfort

7.9

Food

7.2

Overall

8.0

Entertainment

7.1

Reviews

1 / 10

A/C was not working on the ground so it was 110 degrees on the plane when we boarded and we sat there for almost 40 minutes because Austin’s gate system has not kept up with growth. Not Alaska’s fault 100% but it was miserable.

7.4
Good
9,240 reviews
8.0
Very good
9,420 reviews

Boarding

8.2

Crew

8.6

Comfort

7.9

Food

7.2

Overall

8.0

Entertainment

7.1

Reviews

1 / 10

A/C was not working on the ground so it was 110 degrees on the plane when we boarded and we sat there for almost 40 minutes because Austin’s gate system has not kept up with growth. Not Alaska’s fault 100% but it was miserable.

7.2
Good
10,000 reviews
8.0
Very good
9,420 reviews

Boarding

8.2

Crew

8.6

Comfort

7.9

Food

7.2

Overall

8.0

Entertainment

7.1

Reviews

1 / 10

A/C was not working on the ground so it was 110 degrees on the plane when we boarded and we sat there for almost 40 minutes because Austin’s gate system has not kept up with growth. Not Alaska’s fault 100% but it was miserable.

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 $300 on Cheapflights?

    Yes, there are multiple flights from Ontario to San Diego for under $300. The cheapest flight booked recently is on Alaska Airlines for just $222, but on average you can expect to pay $361.

  • Are there last-minute flights available from Ontario to San Diego for under $600?

    There are currently 2+ open flights from Ontario to San Diego within the next 7 days for less than $600.

  • 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 $222. Other airlines that can offer you cheap pricing are United Airlines, from $369, and American Airlines, from $492.

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

    To fly one-way, consider booking your trip with Alaska Airlines, which is currently one of the cheapest options available, starting at $101. Delta flights start at $172 while deals on United Airlines start at $237 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 10/31.

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

    Currently, September is the cheapest month in which you can book a flight from Ontario to San Diego (average of $266). Flying from Ontario to San Diego in March is currently the most expensive (average of $338). 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.

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