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$149+ Cheap flights from Islip 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 11/17. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SFO
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
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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 September 15, 2025.

Round-trip from

$278
(Frontier)

One-way from

$149
(JetBlue)

Popular in

December

Cheapest in

February

Average price

$397
From Islip Long Island to San Francisco
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One-way flight from Islip Long Island to San Francisco
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Highest demand for flights based on searches. 7% potential increase in price ($34 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($13 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 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 September 15, 2025.

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.
Sun 11/99:27 pmISP - SFO
2 stops17h 48mFrontier
Thu 11/131:10 pmSFO - ISP
2 stops18h 27mFrontier
Deal found 9/14$278
This JetBlue 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/271:57 pmISP - SFO
1 stop12h 34mJetBlue
Fri 10/319:44 pmSFO - ISP
1 stop12h 18mJetBlue
Deal found 9/15$352
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/289:49 amISP - SFO
2 stops17h 27mFrontier
Thu 10/211:57 pmSFO - ISP
2 stops13h 30mFrontier
Deal found 9/13$376
This JetBlue 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/244:24 pmISP - SFO
1 stop10h 06mJetBlue
Mon 12/111:00 pmSFO - ISP
1 stop9h 18mJetBlue
Deal found 9/13$397
This JetBlue 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/151:57 pmISP - SFO
1 stop12h 34mJetBlue
Mon 12/111:00 pmSFO - ISP
1 stop9h 18mJetBlue
Deal found 9/13$407
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.
Sat 9/205:05 pmISP - SFO
2 stops18h 10mFrontier
Mon 9/227:07 pmSFO - ISP
2 stops12h 33mFrontier
Deal found 9/14$420
This JetBlue 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/171:57 pmISP - SFO
1 stop12h 34mJetBlue
Tue 12/29:45 pmSFO - ISP
1 stop10h 33mJetBlue
Deal found 9/13$426
This JetBlue 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/171:57 pmISP - SFO
1 stop12h 34mJetBlue
Wed 12/39:45 pmSFO - ISP
1 stop10h 33mJetBlue
Deal found 9/13$445
This JetBlue 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/141:57 pmISP - SFO
1 stop12h 34mJetBlue
Mon 12/111:00 pmSFO - ISP
1 stop9h 18mJetBlue
Deal found 9/13$447
This JetBlue 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/2212:09 pmISP - SFO
1 stop12h 38mJetBlue
Mon 12/111:00 pmSFO - ISP
1 stop9h 18mJetBlue
Deal found 9/13$455
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.
Sat 9/205:05 pmISP - SFO
2 stops18h 10mFrontier
Fri 9/267:07 pmSFO - ISP
2 stops12h 48mFrontier
Deal found 9/14$459
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.
Sat 9/205:05 pmISP - SFO
2 stops18h 10mFrontier
Thu 9/257:07 pmSFO - ISP
2 stops10h 57mFrontier
Deal found 9/14$460

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 September 15, 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 11/17

1:57 pm-11:31 pm

1 stop12h 34m

San Francisco

Mon 12/1

11:00 pm-11:18 am

1 stop9h 18m

$352

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Mon 10/27

1:57 pm-11:31 pm

1 stop12h 34m

San Francisco

Fri 10/31

9:44 pm-1:02 pm

1 stop12h 18m

$352

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Mon 11/24

4:24 pm-11:30 pm

1 stop10h 06m

San Francisco

Mon 12/1

11:00 pm-11:18 am

1 stop9h 18m

$397

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Sat 11/15

1:57 pm-11:31 pm

1 stop12h 34m

San Francisco

Mon 12/1

11:00 pm-11:18 am

1 stop9h 18m

$407

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Sun 9/28

9:49 am-12:16 am

2 stops17h 27m

San Francisco

Sun 10/5

7:07 pm-10:40 am

2 stops12h 33m

$420

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Tue 11/18

1:57 pm-11:31 pm

1 stop12h 34m

San Francisco

Tue 12/2

9:45 pm-11:18 am

1 stop10h 33m

$426

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Mon 11/17

1:57 pm-11:31 pm

1 stop12h 34m

San Francisco

Tue 12/2

9:45 pm-11:18 am

1 stop10h 33m

$426

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Wed 11/19

1:57 pm-11:31 pm

1 stop12h 34m

San Francisco

Tue 12/2

9:45 pm-11:18 am

1 stop10h 33m

$426

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Mon 11/17

1:57 pm-11:31 pm

1 stop12h 34m

San Francisco

Wed 12/3

9:45 pm-11:18 am

1 stop10h 33m

$445

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Tue 11/18

1:57 pm-11:31 pm

1 stop12h 34m

San Francisco

Wed 12/3

9:45 pm-11:18 am

1 stop10h 33m

$445

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 23 results
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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 to San Francisco?

Currently, January is the cheapest month in which you can book a flight from Islip to San Francisco (average of $276). Flying from Islip to San Francisco in June is currently the most expensive (average of $357). 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.

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.

  • How long is the flight from Islip to San Francisco?

    JetBlue and Frontier can get you from Islip to San Francisco in just under 12h 34m. Your travel time can differ by up to 4h 53m. There are 2611 mi between Islip and San Francisco. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • 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 to San Francisco?

    Currently, January is the cheapest month in which you can book a flight from Islip to San Francisco (average of $276). Flying from Islip to San Francisco in June is currently the most expensive (average of $357). 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
Santa Cruz
Livermore
South San Francisco
Turlock
Antioch
Watsonville
Manteca
Santa Clara
Sunnyvale
Hollister
Vacaville
Foster City
Vallejo
Burlingame
Redwood City
Union City
San Leandro
San Mateo
Lathrop

Browse thousands of different options on Cheapflights for your next trip

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