San Francisco

$157+ Cheap flights from Islip, NY to San Francisco (ISP - SFO)

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 9/9. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SFO
Jul 30 — Aug 61
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Cheap flight deals from Islip to San Francisco

Discover tips and strategies to find the most affordable flight options for your journey from Islip (ISP) to San Francisco (SFO). 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 July 25, 2025.

Round-trip from

$325
(FlightHub)

One-way from

$157
(Southwest)

Popular in

December

Cheapest in

February

Average price

$437
From Islip Long Island to San Francisco
One-way flight from Islip Long Island to San Francisco
Highest demand for flights based on searches. 6% potential increase in price ($29 potential increase over avg. RT price).
Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
Average for round-trip flights in July 2025

Find flight deals from Islip to San Francisco

Cheapest flights from Islip to San Francisco
Explore the most affordable flight options available from Islip to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 25, 2025.

This JetBlue deal was found by Cheapflights users on 7/22. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/2712:15 pmISP - SFO
1 stop14h 09mJetBlue
Sun 11/29:45 pmSFO - ISP
1 stop10h 33mJetBlue
Deal found 7/22$279
This FlightHub deal was found by Cheapflights users on 7/24. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/18:37 pmISP - SFO
1 stop16h 48mFrontier
Mon 8/48:53 pmSFO - ISP
1 stop22h 05mFrontier
Deal found 7/24$325
This Southwest deal was found by Cheapflights users on 7/22. 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 9/2712:15 pmISP - SFO
2 stops12h 10mSouthwest
Tue 9/309:05 pmSFO - ISP
1 stop11h 50mSouthwest
Deal found 7/22$348
This Mytrip deal was found by Cheapflights users on 7/23. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/48:38 pmISP - SFO
1 stop16h 47mMultiple Airlines
Mon 8/1112:29 pmSFO - ISP
3 stops21h 46mMultiple Airlines
Deal found 7/23$516
This Booking.com deal was found by Cheapflights users on 7/23. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/77:39 pmISP - SFO
3 stops19h 05mBreeze Airways
Mon 8/1112:29 pmSFO - ISP
3 stops21h 46mBreeze Airways
Deal found 7/23$689

Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip to San Francisco 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 July 25, 2025.
Use the filters below to find and compare flights from Islip to San Francisco that are best for you.

Fly from

Islip

Fly to

San Francisco

Route

Depart

Return

Price

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Mon 10/27

12:15 pm-11:24 pm

1 stop14h 09m

San Francisco

Sun 11/2

9:45 pm-11:18 am

1 stop10h 33m

$279

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Mon 8/4

8:38 pm-10:25 am

1 stop16h 47m

San Francisco

Mon 8/11

8:53 pm-9:58 pm

1 stop22h 05m

$325

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Sat 9/27

12:15 pm-9:25 pm

2 stops12h 10m

San Francisco

Tue 9/30

9:05 pm-11:55 am

1 stop11h 50m

$348

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Mon 8/4

8:38 pm-10:25 am

1 stop16h 47m

San Francisco

Mon 8/11

12:29 pm-1:15 pm

3 stops21h 46m

$516

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Thu 8/7

7:39 pm-11:44 am

3 stops19h 05m

San Francisco

Mon 8/11

12:29 pm-1:15 pm

3 stops21h 46m

$689

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Tue 9/9

6:05 am-1:25 pm

1 stop10h 20m

$157

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Fri 8/1

8:37 pm-10:25 am

1 stop16h 48m

$175

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Mon 10/27

12:15 pm-11:24 pm

1 stop14h 09m

$199

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Mon 11/17

8:47 pm-12:05 pm

2 stops18h 18m

$373

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Tue 9/9

7:30 am-8:10 pm

3 stops15h 40m

$423

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/24

Best time to book a flight from Islip to San Francisco

Have a flexible travel schedule? Discover the best time to fly to San Francisco from Islip 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 Islip to San Francisco

What is the cheapest month to book a flight from Islip, New York to San Francisco?

Currently, January is the cheapest month in which you can book a flight from Islip, New York to San Francisco (average of $276). Flying from Islip, New York to San Francisco in June is currently the most expensive (average of $358). 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.

Reviews of airlines servicing San Francisco

Get insights into the airlines that provide service to San Francisco. 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 Francisco. Reviews last updated July 25, 2025.
Read through reviews of airlines operating flights from Islip to San Francisco, such as Southwest, Breeze Airways, and JetBlue. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Boarding

8.1

Overall

8.0

Food

7.0

Entertainment

7.6

Comfort

8.0

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

Boarding

8.1

Overall

8.0

Food

7.0

Entertainment

7.6

Comfort

8.0

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

Boarding

8.1

Overall

8.0

Food

7.0

Entertainment

7.6

Comfort

8.0

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

Boarding

8.1

Overall

8.0

Food

7.0

Entertainment

7.6

Comfort

8.0

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

Boarding

8.1

Overall

8.0

Food

7.0

Entertainment

7.6

Comfort

8.0

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

Related info for your journey

Find useful and relevant information for your journey from Islip to San Francisco. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
  • What are the cheapest airlines to fly from Islip, New York to San Francisco one-way?

    For one-way options, check prices for Southwest. According to our data, you can fly for as low as $157. Users have also found prices from $175 and $199 on Frontier and JetBlue, respectively.

  • Can I find deals for flights from Islip to San Francisco that include hotel bookings?

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

  • How can I find direct flights from Islip to San Francisco?

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

  • Can I find deals for business class flights from Islip to San Francisco?

    Yes. Cheapflights offers flight deals from Islip to San Francisco 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 Islip, New York to San Francisco?

    Currently, January is the cheapest month in which you can book a flight from Islip, New York to San Francisco (average of $276). Flying from Islip, New York to San Francisco in June is currently the most expensive (average of $358). 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 Francisco?

Book flights to San Francisco if you plan to visit one of these locations
Roseville
Mountain View
Santa Cruz
South San Francisco
Livermore
Turlock
Manteca
Antioch
Hollister
Watsonville
Newark
Milpitas
Sunnyvale
Campbell
Lathrop
Foster City
Capitola
Santa Clara
San Leandro
Burlingame

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