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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 11/4. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SFO
Nov 13 — Nov 201
Thu 11/13
Thu 11/20
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 October 14, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$364
(Southwest)

One-way from

$149
(JetBlue)

Popular in

December

Cheapest in

February

Average price

$387
Provider with most accurate pricing for Islip Long Island-San Francisco flight deals.
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Provider most trusted by Cheapflights users for Islip Long Island-San Francisco flights.
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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. 9% potential increase in price ($39 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 October 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 October 14, 2025.

This Southwest deal was found by Cheapflights users on 10/13. 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.
Mon 12/85:40 amISP - SFO
1 stop10h 40mSouthwest
Mon 12/159:25 pmSFO - ISP
1 stop11h 50mSouthwest
Deal found 10/13$364
This JetBlue deal was found by Cheapflights users on 10/14. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/41:15 pmISP - SFO
1 stop13h 16mJetBlue
Tue 11/119:44 pmSFO - ISP
1 stop11h 34mJetBlue
Deal found 10/14$380
This Southwest deal was found by Cheapflights users on 10/13. 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.
Thu 11/276:00 amISP - SFO
1 stop10h 40mSouthwest
Wed 12/39:25 amSFO - ISP
2 stops9h 40mSouthwest
Deal found 10/13$408
This JetBlue deal was found by Cheapflights users on 10/14. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/41:15 pmISP - SFO
1 stop13h 16mJetBlue
Wed 11/129:44 pmSFO - ISP
1 stop12h 04mJetBlue
Deal found 10/14$426
This Kiwi.com deal was found by Cheapflights users on 10/13. 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.
Tue 10/286:27 pmISP - SFO
2 stops29h 55mMultiple Airlines
Sat 11/112:39 pmSFO - ISP
1 stop23h 00mMultiple Airlines
Deal found 10/13$434
This Priceline deal was found by Cheapflights users on 10/13. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/281:57 pmISP - SFO
1 stop12h 34mJetBlue
Sat 11/19:43 pmSFO - ISP
1 stop13h 09mJetBlue
Deal found 10/13$449
This JetBlue deal was found by Cheapflights users on 10/13. 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.
Tue 10/281:57 pmISP - SFO
1 stop12h 34mJetBlue
Fri 10/319:44 pmSFO - ISP
1 stop12h 18mJetBlue
Deal found 10/13$450
This KAYAK deal was found by Cheapflights users on 10/14. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/104:45 pmISP - SFO
1 stop19h 40mJetBlue
Thu 11/139:44 pmSFO - ISP
1 stop12h 07mJetBlue
Deal found 10/14$452
This JetBlue deal was found by Cheapflights users on 10/14. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/11:57 pmISP - SFO
1 stop12h 34mJetBlue
Tue 11/119:44 pmSFO - ISP
1 stop11h 34mJetBlue
Deal found 10/14$463

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 October 14, 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

Wed 2/25

6:00 am-1:25 pm

1 stop10h 25m

San Francisco

Wed 3/4

9:30 pm-11:40 am

1 stop11h 10m

$364

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Mon 12/8

5:40 am-1:20 pm

1 stop10h 40m

San Francisco

Mon 12/15

9:25 pm-12:15 pm

1 stop11h 50m

$364

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Thu 11/27

6:00 am-1:40 pm

1 stop10h 40m

San Francisco

Wed 12/3

9:25 am-10:05 pm

2 stops9h 40m

$408

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Tue 2/17

4:05 pm-9:55 pm

1 stop8h 50m

San Francisco

Sat 2/21

9:30 pm-12:15 pm

1 stop11h 45m

$430

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Tue 10/28

6:27 pm-9:22 pm

2 stops29h 55m

San Francisco

Sat 11/1

12:39 pm-2:39 pm

1 stop23h 00m

$434

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Tue 10/28

1:57 pm-11:31 pm

1 stop12h 34m

San Francisco

Sat 11/1

9:43 pm-1:52 pm

1 stop13h 09m

$449

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Tue 10/28

1:57 pm-11:31 pm

1 stop12h 34m

San Francisco

Fri 10/31

9:44 pm-1:02 pm

1 stop12h 18m

$450

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Mon 11/10

4:45 pm-9:25 am

1 stop19h 40m

San Francisco

Thu 11/13

9:44 pm-12:51 pm

1 stop12h 07m

$452

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Sat 11/1

1:57 pm-11:31 pm

1 stop12h 34m

San Francisco

Tue 11/11

9:44 pm-12:18 pm

1 stop11h 34m

$463

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

$470

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/14

Showing 1-10 of 22 results
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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 October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice 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-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-San Francisco flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Islip-San Francisco flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Islip-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-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 to San Francisco?

Currently, February is the cheapest month in which you can book a flight from Islip to San Francisco (average of $71). Flying from Islip to San Francisco in July is currently the most expensive (average of $190). 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?

    Southwest can get you from Islip to San Francisco in just under 10h 25m. Your travel time can differ by up to . There are 2611 mi between Islip and San Francisco.

  • 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, February is the cheapest month in which you can book a flight from Islip to San Francisco (average of $71). Flying from Islip to San Francisco in July is currently the most expensive (average of $190). 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
Santa Clara
Manteca
Sunnyvale
Vacaville
Hollister
Foster City
Union City
Vallejo
Fairfield
Burlingame
Redwood City
Lodi
San Mateo

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