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San Juan

$178+ Cheap flights from Fremont, CA to San Juan

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 1/27. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — SJU
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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Cheapflights Tip: The best prices from Fremont to San Juan are usually found in May or January, booked 72 days in advance, depart on a Tuesday or Sunday and return on a Saturday

Find flight deals from Fremont to San Juan

Cheapest flights from Fremont to San Juan
Explore the most affordable flight options available from Fremont to San Juan. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 30, 2025.

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.
Tue 12/29:15 amSFO - SJU
2 stops11h 29mAmerican Airlines
Wed 12/107:00 amSJU - SFO
1 stop12h 05mAmerican Airlines
Deal found 10/30$358
This Frontier deal was found by Cheapflights users on 10/28. 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.
Wed 12/3111:20 pmSFO - SJU
1 stop11h 41mFrontier
Sat 1/107:01 pmSJU - SFO
1 stop16h 48mFrontier
Deal found 10/28$361
This Frontier deal was found by Cheapflights users on 10/28. 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.
Sat 11/1510:23 pmSFO - SJU
1 stop12h 56mFrontier
Sat 11/227:11 amSJU - SFO
2 stops21h 13mFrontier
Deal found 10/28$364
This Frontier deal was found by Cheapflights users on 10/28. 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 11/1410:23 pmSFO - SJU
1 stop12h 56mFrontier
Thu 11/206:01 amSJU - SFO
2 stops19h 07mFrontier
Deal found 10/28$365
This Frontier deal was found by Cheapflights users on 10/28. 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.
Thu 11/1310:23 pmSFO - SJU
1 stop12h 56mFrontier
Wed 11/199:00 amSJU - SFO
2 stops17h 27mFrontier
Deal found 10/28$366
This American Airlines deal was found by Cheapflights users on 10/28. 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.
Fri 11/141:15 pmSFO - SJU
1 stop17h 02mAmerican Airlines
Tue 11/187:15 amSJU - SFO
1 stop10h 22mAmerican Airlines
Deal found 10/28$367
This American Airlines deal was found by Cheapflights users on 10/28. 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.
Wed 12/106:30 amSFO - SJU
1 stop13h 22mAmerican Airlines
Thu 12/1810:25 amSJU - SFO
1 stop17h 34mAmerican Airlines
Deal found 10/28$369
This Frontier deal was found by Cheapflights users on 10/29. 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 11/1410:23 pmSFO - SJU
1 stop12h 56mFrontier
Sat 11/226:01 amSJU - SFO
1 stop17h 22mFrontier
Deal found 10/29$370
This Kiwi.com deal was found by Cheapflights users on 10/28. 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.
Sun 12/286:00 amSFO - SJU
2 stops37h 38mMultiple Airlines
Tue 1/1310:59 amSJU - SFO
1 stop30h 30mMultiple Airlines
Deal found 10/28$371

Cheap flight deals from Fremont to San Juan

Keep the following information in mind while searching for Fremont to San Juan flight deals. Data was last updated October 30, 2025.

Round-trip from

$358
(American Airlines)

One-way from

$178
(Southwest)

Popular in

December

Cheapest in

May

Average price

$443
From Fremont to San Juan
Search Deals
One-way flight from Fremont to San Juan
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($51 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($15 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Fremont to San Juan 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 October 30, 2025.
Use the filters below to find and compare flights from Fremont to San Juan that are best for you.

Fly from

Fremont

Fly to

San Juan

Route

Depart

Return

Price

San FranciscoSan Juan

SFO - SJU

SFOSJU

San Francisco

Sat 1/17

8:20 am-12:10 am

2 stops11h 50m

San Juan Luis Munoz Marin Intl

Sun 1/25

5:35 am-2:40 pm

2 stops13h 05m

$449

San FranciscoSan Juan

SFO - SJU

SFOSJU

San Francisco

Wed 12/10

6:00 am-10:22 pm

2 stops12h 22m

San Juan Luis Munoz Marin Intl

Mon 1/12

2:05 am-1:29 pm

2 stops15h 24m

$469

San FranciscoSan Juan

SFO - SJU

SFOSJU

San Francisco

Sun 1/18

9:20 pm-1:17 pm

1 stop11h 57m

San Juan Luis Munoz Marin Intl

Thu 1/22

2:05 am-12:15 pm

1 stop14h 10m

$469

San FranciscoSan Juan

SFO - SJU

SFOSJU

San Francisco

Tue 1/27

10:50 pm-12:55 pm

1 stop10h 05m

San Juan Luis Munoz Marin Intl

Sun 2/1

2:05 am-10:23 am

1 stop12h 18m

$493

San FranciscoSan Juan

SFO - SJU

SFOSJU

San Francisco

Wed 11/5

6:45 am-10:22 pm

1 stop11h 37m

San Juan Luis Munoz Marin Intl

Fri 11/14

2:05 am-3:35 pm

2 stops17h 30m

$515

San FranciscoSan Juan

SFO - SJU

SFOSJU

San Francisco

Tue 1/27

6:45 am-9:00 pm

1 stop10h 15m

San Juan Luis Munoz Marin Intl

Sat 1/31

2:05 am-10:23 am

1 stop12h 18m

$539

San FranciscoSan Juan

SFO - SJU

SFOSJU

San Francisco

Wed 1/21

6:25 am-10:22 pm

2 stops11h 57m

San Juan Luis Munoz Marin Intl

Sat 1/24

2:05 am-10:23 am

1 stop12h 18m

$539

San FranciscoSan Juan

SFO - SJU

SFOSJU

San Francisco

Mon 12/15

6:07 am-10:22 pm

1 stop12h 15m

San Juan Luis Munoz Marin Intl

Sun 12/21

8:10 am-3:41 pm

1 stop11h 31m

$539

San FranciscoSan Juan

SFO - SJU

SFOSJU

San Francisco

Fri 11/14

9:44 pm-10:35 am

1 stop8h 51m

San Juan Luis Munoz Marin Intl

Fri 11/21

1:59 am-10:10 am

1 stop12h 11m

$553

San FranciscoSan Juan

SFO - SJU

SFOSJU

San Francisco

Wed 1/14

10:59 pm-9:00 pm

2 stops18h 01m

San Juan Luis Munoz Marin Intl

Tue 1/20

2:05 am-3:35 pm

2 stops17h 30m

$601

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/28

Showing 1-10 of 23 results
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Best time to book a flight from Fremont to San Juan

Have a flexible travel schedule? Discover the best time to fly to San Juan 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 Juan

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

Use this chart to determine the optimal time to book a round-trip flight from Fremont to San Juan. Price data was last updated on October 24, 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 Juan. 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 Juan?

Currently, December is the cheapest month in which you can book a flight from Fremont to San Juan (average of $169). Flying from Fremont to San Juan in October is currently the most expensive (average of $329). 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 SJU?

Find hourly flight availability from Fremont to San Juan. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 30, 2025.

One of the essential ways to save on airfare from Fremont to San Juan is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the afternoon could potentially save you up to 32% on airfare.

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

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

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

Reviews of airlines servicing San Juan

Get insights into the airlines that provide service to San Juan. 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 Juan. Reviews last updated October 30, 2025.
See what other customers who have flown with Delta, United Airlines, and American Airlines from Fremont to San Juan have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
7,999 reviews

Food

7.3

Comfort

7.9

Entertainment

7.9

Crew

8.5

Overall

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
7.9
Good
7,999 reviews
Delta
7.9
Good
7,999 reviews

Food

7.3

Comfort

7.9

Entertainment

7.9

Crew

8.5

Overall

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
United Airlines
7.4
Good
8,996 reviews
Delta
7.9
Good
7,999 reviews

Food

7.3

Comfort

7.9

Entertainment

7.9

Crew

8.5

Overall

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
American Airlines
7.2
Good
11,034 reviews
Delta
7.9
Good
7,999 reviews

Food

7.3

Comfort

7.9

Entertainment

7.9

Crew

8.5

Overall

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
JetBlue
7.2
Good
2,906 reviews
Delta
7.9
Good
7,999 reviews

Food

7.3

Comfort

7.9

Entertainment

7.9

Crew

8.5

Overall

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Frontier
5.8
Fair
3,123 reviews
Delta
7.9
Good
7,999 reviews

Food

7.3

Comfort

7.9

Entertainment

7.9

Crew

8.5

Overall

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

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

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

    A quick flight from Fremont to San Juan can take about 11h 50m. Southwest provides one of the quickest options available for as low as $449. The distance between Fremont and San Juan is about 3623 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from Fremont to San Juan one-way?

    One-way options have recently been found by users for as low as $178 on Southwest. Other airlines that offer cheap prices include Frontier from $184 and United Airlines from $190 one-way.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Fremont to San Juan 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 Juan?

    Currently, December is the cheapest month in which you can book a flight from Fremont to San Juan (average of $169). Flying from Fremont to San Juan in October is currently the most expensive (average of $329). 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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Top 8 airlines flying from Fremont to San Juan

Discover the top 8 airlines that operate flights from Fremont to San Juan. 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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$160Average$330FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$232Average$460FlexibilityNo cancel feeOn-time65%
DeltaCheapest$240Average$525FlexibilityNo cancel feeOn-timeN/A
Sun Country AirCheapest$286Average$934FlexibilityNo cancel feeOn-time83%
United AirlinesCheapest$298Average$563FlexibilityNo cancel feeOn-time69%
JetBlueCheapest$315Average$475FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$349Average$594FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$383Average$592FlexibilityNo cancel feeOn-time63%

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