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$149+ Cheap flights from San Francisco to Islip (SFO - ISP)

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 1/7. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — ISP
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheap flight deals from San Francisco to Islip

Discover tips and strategies to find the most affordable flight options for your journey from San Francisco (SFO) to Islip (ISP). 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 11, 2025.

Round-trip from

$252
(Frontier)

One-way from

$149
(JetBlue)

Popular in

December

Cheapest in

February

Average price

$384
From San Francisco to Islip Long Island
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One-way flight from San Francisco to Islip Long Island
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Highest demand for flights based on searches. 7% potential increase in price ($31 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($11 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 San Francisco to Islip

Cheapest flights from San Francisco to Islip
Explore the most affordable flight options available from San Francisco to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This Frontier deal was found by Cheapflights users on 9/10. 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 10/27:07 pmSFO - ISP
2 stops10h 57mFrontier
Sat 10/45:05 pmISP - SFO
2 stops18h 10mFrontier
Deal found 9/10$252
This Frontier deal was found by Cheapflights users on 9/10. 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.
Mon 9/297:07 pmSFO - ISP
2 stops12h 33mFrontier
Sat 10/45:05 pmISP - SFO
2 stops18h 10mFrontier
Deal found 9/10$280
This Frontier deal was found by Cheapflights users on 9/11. 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 10/3012:43 pmSFO - ISP
2 stops18h 54mFrontier
Sun 11/29:27 pmISP - SFO
2 stops17h 43mFrontier
Deal found 9/11$281
This Frontier deal was found by Cheapflights users on 9/10. 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 9/267:07 pmSFO - ISP
2 stops12h 48mFrontier
Sat 10/45:05 pmISP - SFO
2 stops18h 10mFrontier
Deal found 9/10$295
This Booking.com deal was found by Cheapflights users on 9/11. 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.
Fri 9/266:29 amSFO - ISP
2 stops25h 26mFrontier
Tue 9/3011:25 amISP - SFO
2 stops38h 05mFrontier
Deal found 9/11$303
This Frontier deal was found by Cheapflights users on 9/10. 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 9/272:10 pmSFO - ISP
2 stops17h 30mFrontier
Sat 10/45:05 pmISP - SFO
2 stops18h 10mFrontier
Deal found 9/10$307
This Frontier deal was found by Cheapflights users on 9/10. 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.
Mon 9/297:07 pmSFO - ISP
2 stops12h 33mFrontier
Thu 10/211:40 amISP - SFO
2 stops14h 22mFrontier
Deal found 9/10$310
This Frontier deal was found by Cheapflights users on 9/10. 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 9/267:07 pmSFO - ISP
2 stops12h 48mFrontier
Thu 10/211:40 amISP - SFO
2 stops14h 22mFrontier
Deal found 9/10$325
This Frontier deal was found by Cheapflights users on 9/10. 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 9/272:10 pmSFO - ISP
2 stops17h 30mFrontier
Thu 10/211:40 amISP - SFO
2 stops14h 22mFrontier
Deal found 9/10$337
This Frontier deal was found by Cheapflights users on 9/8. 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.
Mon 10/2710:23 pmSFO - ISP
2 stops16h 19mFrontier
Sun 11/29:27 pmISP - SFO
2 stops22h 28mFrontier
Deal found 9/8$348
This JetBlue deal was found by Cheapflights users on 9/10. 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.
Thu 10/309:44 pmSFO - ISP
1 stop12h 27mJetBlue
Mon 11/31:57 pmISP - SFO
1 stop12h 34mJetBlue
Deal found 9/10$352

Cheapflights Fare Finder

 
Customize your flight search to find flights from San Francisco to Islip 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 11, 2025.
Use the filters below to find and compare flights from San Francisco to Islip that are best for you.

Fly from

San Francisco

Fly to

Islip

Route

Depart

Return

Price

San FranciscoIslip

SFO - ISP

SFOISP

San Francisco

Thu 10/2

7:07 pm-9:04 am

2 stops10h 57m

Islip Long Island

Sat 10/4

5:05 pm-8:15 am

2 stops18h 10m

$252

San FranciscoIslip

SFO - ISP

SFOISP

San Francisco

Thu 10/30

12:43 pm-10:37 am

2 stops18h 54m

Islip Long Island

Sun 11/2

9:27 pm-12:10 pm

2 stops17h 43m

$281

San FranciscoIslip

SFO - ISP

SFOISP

San Francisco

Fri 9/26

7:07 pm-10:55 am

2 stops12h 48m

Islip Long Island

Sat 10/4

5:05 pm-8:15 am

2 stops18h 10m

$295

San FranciscoIslip

SFO - ISP

SFOISP

San Francisco

Fri 9/26

6:29 am-10:55 am

2 stops25h 26m

Islip Long Island

Tue 9/30

11:25 am-10:30 pm

2 stops38h 05m

$303

San FranciscoIslip

SFO - ISP

SFOISP

San Francisco

Mon 9/29

7:07 pm-10:40 am

2 stops12h 33m

Islip Long Island

Thu 10/2

11:40 am-11:02 pm

2 stops14h 22m

$310

San FranciscoIslip

SFO - ISP

SFOISP

San Francisco

Fri 9/26

7:07 pm-10:55 am

2 stops12h 48m

Islip Long Island

Thu 10/2

11:40 am-11:02 pm

2 stops14h 22m

$325

San FranciscoIslip

SFO - ISP

SFOISP

San Francisco

Sat 9/27

2:10 pm-10:40 am

2 stops17h 30m

Islip Long Island

Sat 10/4

5:05 pm-8:15 am

2 stops18h 10m

$339

San FranciscoIslip

SFO - ISP

SFOISP

San Francisco

Thu 10/30

9:44 pm-1:11 pm

1 stop12h 27m

Islip Long Island

Mon 11/3

1:57 pm-11:31 pm

1 stop12h 34m

$352

San FranciscoIslip

SFO - ISP

SFOISP

San Francisco

Sun 2/22

5:55 am-11:30 pm

2 stops14h 35m

Islip Long Island

Sat 2/28

1:10 pm-8:15 pm

2 stops10h 05m

$384

San FranciscoIslip

SFO - ISP

SFOISP

San Francisco

Fri 10/31

9:44 pm-1:02 pm

1 stop12h 18m

Islip Long Island

Mon 11/3

1:57 pm-11:31 pm

1 stop12h 34m

$420

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Showing 1-10 of 22 results
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Best time to book a flight from San Francisco to Islip

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

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

Currently, January is the cheapest month in which you can book a flight from San Francisco to Islip (average of $108). Flying from San Francisco to Islip in November is currently the most expensive (average of $213). 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 SFO to ISP?

Find hourly flight availability from San Francisco to Islip. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

A simple way to save on the total cost of your ticket is to fly from San Francisco to Islip at noon. If you’re flexible enough to do this you can expect to save up to 35% on your trip compared to booking a flight in the afternoon.

Reviews of airlines servicing Islip

Get insights into the airlines that provide service to Islip. 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 Islip. Reviews last updated September 11, 2025.
Peruse reviews from past customers who have flown with Southwest from San Francisco to Islip to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Overall

8.0

Food

7.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Overall

8.0

Food

7.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Related info for your journey

Find useful and relevant information for your journey from San Francisco to Islip. 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 San Francisco to Islip?

    Airlines like Frontier fly from San Francisco to Islip in about 10h 57m. The time it takes to get you to your destination can typically vary by up to . The distance from San Francisco to Islip is about 2611 mi.

  • What is the cheapest airline to fly from San Francisco to Islip round-trip?

    Currently priced at $318, Southwest will fly you from San Francisco to Islip and back. In addition to Southwest, many other airlines offer competitively priced options for your trip.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from San Francisco to Islip (average of $108). Flying from San Francisco to Islip in November is currently the most expensive (average of $213). 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 Islip?

Book flights to Islip if you plan to visit one of these locations
Riverhead
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Alternative routes for San Francisco to Islip

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Top airline flying from San Francisco to Islip

Discover the top airline that operate flights from San Francisco to Islip. 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$318Average$549FlexibilityNo cancel feeOn-time63%

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