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$39+ Cheap flights from Fremont, CA to San Diego (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 11/18. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — SAN
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
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Cheapflights Tip: The best prices from Fremont to San Diego are usually found in January or February, booked 72 days in advance, depart on a Saturday or Tuesday and return on a Friday

Cheap flight deals from Fremont to San Diego

Keep the following information in mind while searching for Fremont to San Diego flight deals. Data was last updated September 15, 2025.

Round-trip from

$76
(Expedia)

One-way from

$39
(Alaska Airlines)

Popular in

December

Cheapest in

January

Average price

$155
From Fremont to San Diego
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One-way flight from Fremont to San Diego
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High demand for flights, 2% potential price rise
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Cheapest flight prices on average. 1% potential price decrease ($3 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Fremont to San Diego

Cheapest flights from Fremont to San Diego
Explore the most affordable flight options available from Fremont to San Diego. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 15, 2025.

This Expedia deal was found by Cheapflights users on 9/13. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/303:14 pmSFO - SAN
Nonstop1h 43mMultiple Airlines
Tue 11/48:08 pmSAN - SFO
Nonstop1h 53mMultiple Airlines
Deal found 9/13$76
This Southwest deal was found by Cheapflights users on 9/15. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/138:15 pmSFO - SAN
Nonstop1h 30mSouthwest
Tue 10/147:40 pmSAN - SFO
Nonstop1h 40mSouthwest
Deal found 9/15$77
This Frontier deal was found by Cheapflights users on 9/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/612:17 pmSFO - SAN
Nonstop1h 40mFrontier
Fri 10/105:28 pmSAN - SFO
Nonstop1h 45mFrontier
Deal found 9/15$78
This Trip.com deal was found by Cheapflights users on 9/15. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/209:59 pmSFO - SAN
Nonstop1h 41mFrontier
Sat 9/277:20 pmSAN - SFO
Nonstop1h 49mFrontier
Deal found 9/15$79
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/1810:24 amSFO - SAN
Nonstop1h 42mFrontier
Sun 10/1911:51 amSAN - SFO
Nonstop2h 01mFrontier
Deal found 9/13$80
This Cheapflightsfares deal was found by Cheapflights users on 9/13. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/169:39 amSFO - SAN
Nonstop1h 48mFrontier
Sun 10/1911:51 amSAN - SFO
Nonstop2h 01mFrontier
Deal found 9/13$81
This Southwest deal was found by Cheapflights users on 9/12. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/155:15 amSFO - SAN
1 stop6h 45mSouthwest
Sat 11/151:45 pmSAN - SFO
Nonstop1h 40mSouthwest
Deal found 9/12$82
This Frontier deal was found by Cheapflights users on 9/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/143:14 pmSFO - SAN
Nonstop1h 43mFrontier
Mon 11/1712:12 pmSAN - SFO
Nonstop1h 52mFrontier
Deal found 9/14$84
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/49:59 pmSFO - SAN
Nonstop1h 41mFrontier
Fri 10/105:28 pmSAN - SFO
Nonstop1h 45mFrontier
Deal found 9/15$85
This Southwest deal was found by Cheapflights users on 9/13. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/245:40 amSFO - SAN
Nonstop1h 30mSouthwest
Mon 10/277:35 pmSAN - SFO
1 stop4h 10mSouthwest
Deal found 9/13$86
This Southwest deal was found by Cheapflights users on 9/12. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/138:15 pmSFO - SAN
Nonstop1h 30mSouthwest
Thu 10/167:35 pmSAN - SFO
1 stop4h 10mSouthwest
Deal found 9/12$88

Cheapflights Fare Finder

 
Customize your flight search to find flights from Fremont 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 2,558,603 searches. Data last updated September 15, 2025.
Use the filters below to find and compare flights from Fremont to San Diego that are best for you.

Fly from

Fremont

Fly to

San Diego

Route

Depart

Return

Price

San FranciscoSan Diego

SFO - SAN

SFOSAN

San Francisco

Sat 10/11

7:10 pm-8:49 pm

Nonstop1h 39m

San Diego

Thu 10/16

8:08 pm-9:48 pm

Nonstop1h 40m

$77

San FranciscoSan Diego

SFO - SAN

SFOSAN

San Francisco

Mon 11/17

7:00 am-8:40 am

Nonstop1h 40m

San Diego

Wed 11/19

8:08 pm-10:01 pm

Nonstop1h 53m

$77

San FranciscoSan Diego

SFO - SAN

SFOSAN

San Francisco

Sun 11/16

12:55 pm-2:25 pm

Nonstop1h 30m

San Diego

Sat 11/22

9:35 pm-11:15 pm

Nonstop1h 40m

$87

San FranciscoSan Diego

SFO - SAN

SFOSAN

San Francisco

Mon 10/13

8:15 pm-9:45 pm

Nonstop1h 30m

San Diego

Thu 10/16

7:35 pm-11:45 pm

1 stop4h 10m

$88

San FranciscoSan Diego

SFO - SAN

SFOSAN

San Francisco

Sat 10/18

4:35 pm-9:00 pm

1 stop4h 25m

San Diego

Mon 10/20

7:35 pm-11:45 pm

1 stop4h 10m

$96

San FranciscoSan Diego

SFO - SAN

SFOSAN

San Francisco

Tue 10/14

10:26 am-12:16 pm

Nonstop1h 50m

San Diego

Wed 10/15

7:15 am-9:06 am

Nonstop1h 51m

$97

San FranciscoSan Diego

SFO - SAN

SFOSAN

San Francisco

Tue 10/14

5:30 am-10:25 am

1 stop4h 55m

San Diego

Tue 10/21

10:35 am-12:20 pm

Nonstop1h 45m

$97

San FranciscoSan Diego

SFO - SAN

SFOSAN

San Francisco

Sat 10/11

2:20 pm-3:59 pm

Nonstop1h 39m

San Diego

Sat 10/11

6:00 pm-7:40 pm

Nonstop1h 40m

$98

San FranciscoSan Diego

SFO - SAN

SFOSAN

San Francisco

Sun 11/2

5:15 am-9:20 am

1 stop4h 05m

San Diego

Thu 11/6

7:00 am-8:45 am

Nonstop1h 45m

$99

San FranciscoSan Diego

SFO - SAN

SFOSAN

San Francisco

Tue 12/2

5:30 am-10:45 am

1 stop5h 15m

San Diego

Sun 12/7

10:30 am-12:10 pm

Nonstop1h 40m

$99

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 21 results
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Best time to book a flight from Fremont to San Diego

Have a flexible travel schedule? Discover the best time to fly to San Diego from Fremont 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.

Cheapflights Insights

Everything you need to know about your flight from Fremont to San Diego

How far ahead should I book a flight from Fremont to San Diego?

Use this chart to determine the optimal time to book a round-trip flight from Fremont to San Diego. Price data was last updated on September 12, 2025.

Booking 72 days in advance of your planned departure date is, on average, the best time to get cheap flights from Fremont to San Diego. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, August is the cheapest month in which you can book a flight from Fremont to San Diego (average of $286). Flying from Fremont to San Diego in March is currently the most expensive (average of $366). 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 FR8 to SAN?

Find hourly flight availability from Fremont 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 September 15, 2025.

When flying from Fremont to San Diego, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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

Use this chart to determine the cheapest time to fly round-trip from Fremont to San Diego. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Fremont to San Diego flight should consider departing on Saturday evenings when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Fremont to San Diego

Explore weekly flight availability from Fremont 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 September 15, 2025.

The most flights from FR8 to SAN are scheduled on a Monday (85 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (53 on average).

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 September 15, 2025.
See what other customers who have flown with Alaska Airlines, Southwest, and Hawaiian Airlines from Fremont to San Diego have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Boarding

8.1

Entertainment

7.0

Food

7.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Boarding

8.1

Entertainment

7.0

Food

7.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Southwest
8.0
Very good
4,242 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Boarding

8.1

Entertainment

7.0

Food

7.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Hawaiian Airlines
7.8
Good
2,723 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Boarding

8.1

Entertainment

7.0

Food

7.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
United Airlines
7.4
Good
8,929 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Boarding

8.1

Entertainment

7.0

Food

7.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Frontier
5.8
Fair
3,172 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Boarding

8.1

Entertainment

7.0

Food

7.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.

Related info for your journey

Find useful and relevant information for your journey from Fremont to San Diego. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to San Diego from Fremont?

    For a flight from Fremont to San Diego, you will be flying into San Diego. San Diego (SAN) is just 2.6 mi from the center of the city. San Diego is the only San Diego airport and it handles 75 inbound flights from Fremont per day. 8 airlines have flights to San Diego from Fremont on a regular basis.

  • How popular is this Fremont to San Diego flight route?

    Within the past month, 204 users have taken a look at flights from Fremont to San Diego.

  • How long is the flight from Fremont to San Diego?

    There are many flights that can get you from Fremont to San Diego in 1h 30m. Fly via United Airlines, Alaska Airlines, or Southwest to get the fastest option. There are 446 mi between Fremont and San Diego. Most flights are nonstop.

  • What are the cheapest airlines to fly from Fremont 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 $39. Alaska Airlines flights start at $39 while deals on Southwest start at $39 one-way.

  • What are the most reliable airlines from Fremont to San Diego?

    Before booking your flight to San Diego from Fremont, check out the most reliable airlines to get you to your destination on time: Air China (88%), United Airlines (78%), Emirates( 78%).

  • What are the cheapest flights from Fremont to San Diego?

    While on average a flight from Fremont to San Diego is generally $346, our data shows the cheapest flight currently is $38. When looking at the most popular route, (San Francisco - San Diego), you can expect to pay $62 for that flight.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Fremont 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.

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

    Currently, August is the cheapest month in which you can book a flight from Fremont to San Diego (average of $286). Flying from Fremont to San Diego in March is currently the most expensive (average of $366). 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

Traveling to a place near San Diego?

Book flights to San Diego if you plan to visit one of these locations
El Cajon
Chula Vista
La Mesa
Poway
Lemon Grove
Coronado
Imperial Beach
National City
Alpine

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Top 8 airlines flying from Fremont to San Diego

Discover the top 8 airlines that operate flights from Fremont to San Diego. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$27Average$95FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$28Average$107FlexibilityNo cancel feeOn-time65%
Hawaiian AirlinesCheapest$38Average$156FlexibilityNo cancel feeOn-time85%
United AirlinesCheapest$57Average$185FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$58Average$188FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$78Average$208FlexibilityNo cancel feeOn-time63%
DeltaCheapest$98Average$196FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$177Average$317FlexibilityNo cancel feeOn-time71%

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