$225+ Cheap flights from San Francisco to Islip, NY (SFO - ISP)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/15. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — ISP
Oct 12 — Oct 191
Round-trip
1 adult, Economy
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Find cheap flights from San Francisco to Islip with Cheapflights
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Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from San Francisco to Islip
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Best
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Cheapest flights from San Francisco to IslipExplore 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 12, 2026.
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 12, 2026.
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2811:40 pm -
2 stops11h 50m
Sun 11/15:35 am -
1 stop11h 10m
Deal found 9/8![Southwest logo]()
$438
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/219:35 pm -
1 stop13h 55m
Mon 10/263:10 pm -
2 stops11h 05m
Deal found 9/8![Southwest logo]()
$444
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/309:35 pm -
1 stop11h 20m
Sun 11/15:35 am -
1 stop11h 10m
Deal found 9/11![Southwest logo]()
$480
This Frontier deal was found by Cheapflights users on 9/9. 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 10/2310:14 pm -
2 stops16h 16m
Mon 10/266:55 pm -
2 stops19h 22m
Deal found 9/9![Frontier logo]()
$559
This Southwest deal was found by Cheapflights users on 9/9. 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 10/89:55 am -
2 stops10h 45m
Sun 10/115:40 am -
1 stop9h 15m
Deal found 9/9![Southwest logo]()
$638
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.
Sun 10/1810:14 pm -
2 stops16h 46m
Fri 10/236:55 pm -
2 stops19h 10m
Deal found 9/10![Frontier logo]()
$656
This FlightHub 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/910:40 am -
1 stop31h 57m
Mon 10/126:00 am -
1 stop30h 05m
Deal found 9/10![JetBlue logo]()
$703
Best flights from San Francisco to IslipDiscover carefully curated flight deals from San Francisco to Islip that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 12, 2026.
Discover carefully curated flight deals from San Francisco to Islip that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 12, 2026.
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2811:40 pm -
2 stops11h 50m
Sun 11/15:35 am -
1 stop11h 10m
Deal found 9/8![Southwest logo]()
$438
This FlightHub 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/910:40 am -
1 stop31h 57m
Mon 10/126:00 am -
1 stop30h 05m
Deal found 9/10![JetBlue logo]()
$703
This KAYAK 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1212:46 pm -
2 stops17h 13m
Sun 11/157:45 pm -
3 stops18h 24m
Deal found 9/11![Breeze Airways logo]()
$734
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/309:35 pm -
1 stop11h 20m
Sun 11/15:35 am -
1 stop11h 10m
Deal found 9/11![Southwest logo]()
$480
This Southwest deal was found by Cheapflights users on 9/9. 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 10/89:55 am -
2 stops10h 45m
Sun 10/115:40 am -
1 stop9h 15m
Deal found 9/9![Southwest logo]()
$638
This KAYAK 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/2412:36 pm -
1 stop25h 57m
Sun 11/17:45 pm -
3 stops18h 24m
Deal found 9/11![Breeze Airways logo]()
$754
This Southwest deal was found by Cheapflights users on 9/7. 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 9/1510:30 pm -
1 stop8h 45m
Sat 10/1012:20 pm -
2 stops12h 30m
Deal found 9/7![Southwest logo]()
$802
Last-minute flights from San Francisco to IslipDiscover last-minute flight deals from San Francisco to Islip. Data last updated September 12, 2026 and is based on user searches.
Discover last-minute flight deals from San Francisco to Islip. Data last updated September 12, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 9/9. 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 10/89:55 am -
2 stops10h 45m
Sun 10/115:40 am -
1 stop9h 15m
Deal found 9/9![Southwest logo]()
$638
This FlightHub 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/910:40 am -
1 stop31h 57m
Mon 10/126:00 am -
1 stop30h 05m
Deal found 9/10![JetBlue logo]()
$703
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.
Sun 10/1810:14 pm -
2 stops16h 46m
Fri 10/236:55 pm -
2 stops19h 10m
Deal found 9/10![Frontier logo]()
$656
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/219:35 pm -
1 stop13h 55m
Mon 10/263:10 pm -
2 stops11h 05m
Deal found 9/8![Southwest logo]()
$444
This Frontier deal was found by Cheapflights users on 9/9. 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 10/2310:14 pm -
2 stops16h 16m
Mon 10/266:55 pm -
2 stops19h 22m
Deal found 9/9![Frontier logo]()
$559
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2811:40 pm -
2 stops11h 50m
Sun 11/15:35 am -
1 stop11h 10m
Deal found 9/8![Southwest logo]()
$438
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/309:35 pm -
1 stop11h 20m
Sun 11/15:35 am -
1 stop11h 10m
Deal found 9/11![Southwest logo]()
$480
One-way flights from San Francisco to IslipSearch for one-way flight options from San Francisco to Islip. Find affordable one-way fares based on user searches. Data last updated September 12, 2026.
Search for one-way flight options from San Francisco to Islip. Find affordable one-way fares based on user searches. Data last updated September 12, 2026.
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/154:57 pm -
3 stops39h 23m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![Multiple Airlines logo]()
$225
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/159:25 pm -
1 stop11h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![Southwest logo]()
$244
This JetBlue deal was found by Cheapflights users on 9/7. 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 10/210:24 am -
1 stop9h 58m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![JetBlue logo]()
$277
This KAYAK deal was found by Cheapflights users on 9/9. 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.
Wed 10/710:30 am -
1 stop9h 52m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/9![JetBlue logo]()
$279
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.
Fri 10/2310:14 pm -
2 stops16h 16m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![Frontier logo]()
$281
This JetBlue 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/610:30 am -
1 stop9h 52m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![JetBlue logo]()
$287
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 10/511:58 pm -
2 stops14h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/10![Frontier logo]()
$291
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.
Fri 10/1610:14 pm -
2 stops16h 16m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![Frontier logo]()
$292
This KAYAK 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/110:24 am -
1 stop9h 58m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/10![JetBlue logo]()
$295
Find 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 12, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $438 (Southwest) |
One-way from | $225 (Kiwi.com) |
Popular in | June |
Cheapest in | January |
Average price | $483 |
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 7,457,451 searches. Data last updated September 12, 2026.
Use the filters below to find and compare flights from San Francisco to Islip that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
San FranciscoIslip
SFO San Francisco - ISP Islip Long Island
SFOISP
San Francisco
Sat 10/3
10:24 am-11:22 pm
1 stop9h 58m
Islip Long Island
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$277
San FranciscoIslip
SFO San Francisco - ISP Islip Long Island
SFOISP
San Francisco
Tue 10/6
10:30 am-11:22 pm
1 stop9h 52m
Islip Long Island
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$277
San FranciscoIslip
SFO San Francisco - ISP Islip Long Island
SFOISP
San Francisco
Fri 10/2
10:24 am-11:22 pm
1 stop9h 58m
Islip Long Island
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$297
San FranciscoIslip
SFO San Francisco - ISP Islip Long Island
SFOISP
San Francisco
Wed 10/7
10:30 am-11:22 pm
1 stop9h 52m
Islip Long Island
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$297
Quickest round-trip
San FranciscoIslip
SFO San Francisco - ISP Islip Long Island
SFOISP
San Francisco
Mon 12/21
10:45 pm-11:30 am
2 stops9h 45m
Islip Long Island
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$341
San FranciscoIslip
SFO San Francisco - ISP Islip Long Island
SFOISP
San Francisco
Wed 9/30
10:24 am-11:22 pm
1 stop9h 58m
Islip Long Island
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$355
San FranciscoIslip
SFO San Francisco - ISP Islip Long Island
SFOISP
San Francisco
Thu 10/1
10:24 am-11:22 pm
1 stop9h 58m
Islip Long Island
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$355
San FranciscoIslip
SFO San Francisco - ISP Islip Long Island
SFOISP
San Francisco
Wed 10/28
11:40 pm-2:30 pm
2 stops11h 50m
Islip Long Island
Sun 11/1
5:35 am-1:45 pm
1 stop11h 10m
$438
San FranciscoIslip
SFO San Francisco - ISP Islip Long Island
SFOISP
San Francisco
Fri 10/30
9:35 pm-11:55 am
1 stop11h 20m
Islip Long Island
Sun 11/1
5:35 am-1:45 pm
1 stop11h 10m
$480
San FranciscoIslip
SFO San Francisco - ISP Islip Long Island
SFOISP
San Francisco
Thu 10/8
9:55 am-11:40 pm
2 stops10h 45m
Islip Long Island
Sun 10/11
5:40 am-11:55 am
1 stop9h 15m
$638
Showing 1-10 of 14 resultsSorted by cheapest first
Compare providers for flights from San Francisco to Islip
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 San Francisco to Islip in September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on San Francisco-Islip, New York flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on San Francisco-Islip, New York flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from San Francisco-Islip, New York flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on San Francisco-Islip, New York 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 San Francisco-Islip, New York 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 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.
SFO-ISP
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.
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 12, 2026.
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.
Entertainment
7.5
Overall
8.0
Boarding
8.1
Comfort
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Entertainment
7.5
Overall
8.0
Boarding
8.1
Comfort
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
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.
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Book flights to Islip if you plan to visit one of these locationsRiverhead
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Check out other popular destinations found by fellow travelers in 2026
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 7,457,451 searches. Data last updated September 12, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$398 | Average$475 | FlexibilityNo cancel fee | On-time63% |