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$86+ 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 5/20. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SFO
Apr 26 — May 31
Sun 4/26
Sun 5/3
1 adult, Economy
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Cheap 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 March 27, 2026.

This CheapOair deal was found by Cheapflights users on 3/26. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/2311:00 am
ISP
-
SFO
1 stop26h 41m
Frontier
Thu 6/48:44 pm
SFO
-
ISP
1 stop10h 21m
Frontier
Deal found 3/26$255
This CheapOair deal was found by Cheapflights users on 3/26. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/1610:48 am
ISP
-
SFO
1 stop26h 41m
Frontier
Mon 7/208:51 pm
SFO
-
ISP
1 stop16h 05m
Frontier
Deal found 3/26$270
This CheapOair deal was found by Cheapflights users on 3/25. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/2111:00 am
ISP
-
SFO
1 stop26h 41m
Frontier
Sun 5/248:44 pm
SFO
-
ISP
1 stop10h 21m
Frontier
Deal found 3/25$290
This Southwest deal was found by Cheapflights users on 3/23. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/214:10 pm
ISP
-
SFO
1 stop8h 15m
Southwest
Tue 4/2811:25 pm
SFO
-
ISP
2 stops9h 30m
Southwest
Deal found 3/23$327
This CheapOair deal was found by Cheapflights users on 3/23. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/164:41 pm
ISP
-
SFO
1 stop20h 48m
Frontier
Wed 6/248:51 pm
SFO
-
ISP
1 stop10h 12m
Frontier
Deal found 3/23$355
This Southwest deal was found by Cheapflights users on 3/26. 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.
Tue 4/1412:30 pm
ISP
-
SFO
2 stops10h 25m
Southwest
Tue 4/1411:25 pm
SFO
-
ISP
2 stops11h 25m
Southwest
Deal found 3/26$383
This Southwest deal was found by Cheapflights users on 3/27. 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.
Thu 5/74:30 pm
ISP
-
SFO
1 stop9h 50m
Southwest
Sat 5/96:15 am
SFO
-
ISP
2 stops14h 05m
Southwest
Deal found 3/27$404
This CheapOair deal was found by Cheapflights users on 3/26. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/1810:48 am
ISP
-
SFO
1 stop26h 41m
Frontier
Tue 6/238:51 pm
SFO
-
ISP
1 stop10h 12m
Frontier
Deal found 3/26$420
This Southwest deal was found by Cheapflights users on 3/24. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/164:30 pm
ISP
-
SFO
1 stop9h 50m
Southwest
Mon 4/2011:25 pm
SFO
-
ISP
2 stops11h 25m
Southwest
Deal found 3/24$422

Find 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 March 27, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$255
(CheapOair)

One-way from

$86
(CheapOair)

Popular in

December

Cheapest in

January

Average price

$399
Provider with most accurate pricing for Islip Long Island-San Francisco flight deals.
Search Deals
Provider most trusted by Cheapflights users for Islip Long Island-San Francisco flights.
Search Deals
From Islip Long Island to San Francisco
Search Deals
One-way flight from Islip Long Island to San Francisco
Search Deals
Highest demand for flights based on searches. 3% potential increase in price ($12 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

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 March 27, 2026.
Use the filters below to find and compare flights from Islip to San Francisco that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Tue 6/16

4:41 pm-10:29 am

1 stop20h 48m

San Francisco

Wed 6/24

8:51 pm-10:03 am

1 stop10h 12m

$355

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Tue 4/14

12:30 pm-7:55 pm

2 stops10h 25m

San Francisco

Tue 4/14

9:15 pm-1:50 pm

1 stop13h 35m

$383

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Thu 5/7

4:30 pm-11:20 pm

1 stop9h 50m

San Francisco

Sat 5/9

6:15 am-11:20 pm

2 stops14h 05m

$404

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Fri 4/24

4:30 pm-11:20 pm

1 stop9h 50m

San Francisco

Fri 5/1

10:55 pm-11:35 am

2 stops9h 40m

$431
Quickest round-trip

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Fri 4/10

4:30 pm-11:20 pm

1 stop9h 50m

San Francisco

Tue 4/14

11:25 pm-11:55 am

2 stops9h 30m

$485

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Wed 4/22

4:10 pm-11:35 pm

2 stops10h 25m

San Francisco

Wed 4/29

5:25 am-6:30 pm

2 stops10h 05m

$513

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Fri 4/10

4:30 pm-11:20 pm

1 stop9h 50m

San Francisco

Mon 4/13

11:25 pm-11:55 am

2 stops9h 30m

$568
Cheapest one-way

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Wed 5/20

11:00 am-10:41 am

1 stop26h 41m

$86

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Wed 5/27

11:00 am-10:41 am

1 stop26h 41m

$131

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Sun 6/21

10:48 am-10:29 am

1 stop26h 41m

$151

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/25

Showing 1-10 of 18 resultsSorted by cheapest first
1
2

Compare providers for flights from Islip to San Francisco

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 Islip to San Francisco in March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*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 Islip, New York-San Francisco flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Islip, New York-San Francisco flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Islip, New York-San Francisco flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Islip, New York-San Francisco 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 Islip, New York-San Francisco 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 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, December is the cheapest month in which you can book a flight from Islip, New York to San Francisco (average of $113). Flying from Islip, New York to San Francisco in May is currently the most expensive (average of $198). 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, New York to San Francisco?

    A quick flight from Islip, New York to San Francisco can take about 10h 25m. Frontier provides one of the quickest options available for as low as $383. The distance from Islip, New York to San Francisco is about 2611 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • 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, December is the cheapest month in which you can book a flight from Islip, New York to San Francisco (average of $113). Flying from Islip, New York to San Francisco in May is currently the most expensive (average of $198). 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
South San Francisco
Santa Cruz
Santa Clara
Livermore
Roseville
Rancho Cordova
San Bruno
Watsonville
San Ramon
Sunnyvale
Vacaville
San Carlos
Turlock
Redwood City
San Lorenzo
Davis
Manteca
Union City
Elk Grove
Rohnert Park

Browse thousands of different options on Cheapflights for your next trip

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