$185+ Cheap flights from Islip, NY to San Francisco (ISP - SFO)
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 1/13. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SFO
Oct 3 — Oct 101
Round-trip
1 adult, Economy
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Find cheap flights from Islip to San Francisco with Cheapflights
1. Tell us where you want to go
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
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
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 Islip to San Francisco
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Best
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One-way
Cheapest flights from Islip to San FranciscoExplore 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 3, 2026.
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 3, 2026.
This Southwest deal was found by Cheapflights users on 9/3. 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 10/153:10 pm -
2 stops11h 05m
Tue 10/209:35 pm -
1 stop11h 35m
Deal found 9/3![Southwest logo]()
$380
This Southwest deal was found by Cheapflights users on 9/1. 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 10/196:00 am -
1 stop11h 35m
Fri 10/239:35 pm -
1 stop11h 20m
Deal found 9/1![Southwest logo]()
$391
This Southwest deal was found by Cheapflights users on 8/30. 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 11/116:05 am -
1 stop10h 45m
Fri 11/139:25 pm -
1 stop11h 40m
Deal found 8/30![Southwest logo]()
$440
This Kiwi.com deal was found by Cheapflights users on 8/31. 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 9/155:43 pm -
2 stops20h 04m
Sat 9/1912:36 pm -
1 stop27h 15m
Deal found 8/31![Multiple Airlines logo]()
$480
This Southwest deal was found by Cheapflights users on 8/31. 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 9/306:05 am -
1 stop8h 30m
Sun 10/49:35 pm -
1 stop13h 55m
Deal found 8/31![Southwest logo]()
$548
This Southwest deal was found by Cheapflights users on 9/2. 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 9/176:10 am -
1 stop9h 50m
Mon 9/2110:30 pm -
1 stop8h 45m
Deal found 9/2![Southwest logo]()
$597
Best flights from Islip to San FranciscoDiscover carefully curated flight deals from Islip to San Francisco that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 3, 2026.
Discover carefully curated flight deals from Islip to San Francisco that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 3, 2026.
This Southwest deal was found by Cheapflights users on 9/1. 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 10/196:00 am -
1 stop11h 35m
Fri 10/239:35 pm -
1 stop11h 20m
Deal found 9/1![Southwest logo]()
$391
This Southwest deal was found by Cheapflights users on 8/30. 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 11/116:05 am -
2 stops10h 55m
Fri 11/139:25 pm -
1 stop11h 40m
Deal found 8/30![Southwest logo]()
$446
This Southwest deal was found by Cheapflights users on 9/3. 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 10/153:10 pm -
2 stops11h 05m
Tue 10/2011:40 pm -
2 stops13h 05m
Deal found 9/3![Southwest logo]()
$484
This Southwest deal was found by Cheapflights users on 8/31. 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 9/306:05 am -
1 stop8h 30m
Sun 10/49:35 pm -
1 stop13h 55m
Deal found 8/31![Southwest logo]()
$548
This Southwest deal was found by Cheapflights users on 8/31. 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 9/156:05 am -
1 stop8h 30m
Sat 9/1910:30 pm -
1 stop8h 25m
Deal found 8/31![Southwest logo]()
$624
This Southwest deal was found by Cheapflights users on 9/3. 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 9/286:10 am -
1 stop9h 50m
Thu 10/111:40 pm -
2 stops11h 50m
Deal found 9/3![Southwest logo]()
$738
Last-minute flights from Islip to San FranciscoDiscover last-minute flight deals from Islip to San Francisco. Data last updated September 3, 2026 and is based on user searches.
Discover last-minute flight deals from Islip to San Francisco. Data last updated September 3, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 8/31. 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 9/155:43 pm -
2 stops20h 04m
Sat 9/1912:36 pm -
1 stop27h 15m
Deal found 8/31![Multiple Airlines logo]()
$480
This Southwest deal was found by Cheapflights users on 8/30. 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 9/156:05 am -
1 stop8h 30m
Sat 9/1910:30 pm -
1 stop8h 25m
Deal found 8/30![Southwest logo]()
$624
This Southwest deal was found by Cheapflights users on 9/2. 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 9/176:10 am -
1 stop9h 50m
Mon 9/2110:30 pm -
1 stop8h 45m
Deal found 9/2![Southwest logo]()
$597
This Southwest deal was found by Cheapflights users on 8/31. 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 9/306:05 am -
1 stop8h 30m
Sun 10/49:35 pm -
1 stop13h 55m
Deal found 8/31![Southwest logo]()
$548
This Southwest deal was found by Cheapflights users on 9/3. 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 10/153:10 pm -
2 stops11h 05m
Tue 10/209:35 pm -
1 stop11h 35m
Deal found 9/3![Southwest logo]()
$380
This Southwest deal was found by Cheapflights users on 9/1. 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 10/196:00 am -
1 stop11h 35m
Fri 10/2310:50 pm -
2 stops10h 05m
Deal found 9/1![Southwest logo]()
$391
One-way flights from Islip to San FranciscoSearch for one-way flight options from Islip to San Francisco. Find affordable one-way fares based on user searches. Data last updated September 3, 2026.
Search for one-way flight options from Islip to San Francisco. Find affordable one-way fares based on user searches. Data last updated September 3, 2026.
This Southwest deal was found by Cheapflights users on 9/1. 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 1/135:45 am -
1 stop11h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/1![Southwest logo]()
$185
This Kiwi.com deal was found by Cheapflights users on 9/1. 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.
Wed 9/1612:00 pm -
2 stops15h 14m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/1![Multiple Airlines logo]()
$236
This Kiwi.com deal was found by Cheapflights users on 9/2. 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 9/1512:00 pm -
2 stops35h 08m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/2![Multiple Airlines logo]()
$244
This Kiwi.com deal was found by Cheapflights users on 9/1. 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 10/116:25 pm -
2 stops43h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/1![Frontier logo]()
$277
This Frontier deal was found by Cheapflights users on 9/2. 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 10/306:54 pm -
2 stops19h 23m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/2![Frontier logo]()
$297
This Southwest deal was found by Cheapflights users on 9/1. 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 9/166:05 am -
1 stop8h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/1![Southwest logo]()
$299
This Frontier deal was found by Cheapflights users on 9/2. 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 10/266:55 pm -
2 stops19h 22m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/2![Frontier logo]()
$311
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 September 3, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $380 (Southwest) |
One-way from | $185 (Southwest) |
Popular in | June |
Cheapest in | January |
Average price | $444 |
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 7,457,451 searches. Data last updated September 3, 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
Cheapest round-trip
IslipSan Francisco
ISP Islip Long Island - SFO San Francisco
ISPSFO
Islip Long Island
Wed 1/13
5:45 am-2:20 pm
1 stop11h 35m
San Francisco
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$185
IslipSan Francisco
ISP Islip Long Island - SFO San Francisco
ISPSFO
Islip Long Island
Wed 9/16
12:00 pm-12:14 am
2 stops15h 14m
San Francisco
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$236
IslipSan Francisco
ISP Islip Long Island - SFO San Francisco
ISPSFO
Islip Long Island
Sun 10/11
6:25 pm-11:05 am
2 stops43h 40m
San Francisco
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$277
Quickest round-trip
IslipSan Francisco
ISP Islip Long Island - SFO San Francisco
ISPSFO
Islip Long Island
Wed 9/16
6:05 am-11:35 am
1 stop8h 30m
San Francisco
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$299
IslipSan Francisco
ISP Islip Long Island - SFO San Francisco
ISPSFO
Islip Long Island
Mon 12/7
9:56 am-12:41 am
2 stops17h 45m
San Francisco
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$346
IslipSan Francisco
ISP Islip Long Island - SFO San Francisco
ISPSFO
Islip Long Island
Sun 10/11
5:40 am-11:55 am
1 stop9h 15m
San Francisco
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$359
IslipSan Francisco
ISP Islip Long Island - SFO San Francisco
ISPSFO
Islip Long Island
Mon 11/30
4:55 pm-12:25 am
2 stops10h 30m
San Francisco
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$361
IslipSan Francisco
ISP Islip Long Island - SFO San Francisco
ISPSFO
Islip Long Island
Fri 11/6
6:54 pm-11:17 am
2 stops19h 23m
San Francisco
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$376
IslipSan Francisco
ISP Islip Long Island - SFO San Francisco
ISPSFO
Islip Long Island
Mon 10/19
6:00 am-2:35 pm
1 stop11h 35m
San Francisco
Fri 10/23
9:35 pm-11:55 am
1 stop11h 20m
$391
IslipSan Francisco
ISP Islip Long Island - SFO San Francisco
ISPSFO
Islip Long Island
Tue 9/15
7:00 am-9:03 am
1 stop29h 03m
San Francisco
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$433
Showing 1-10 of 16 resultsSorted by cheapest first
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 September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- 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.
ISP-SFO
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.
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.
Traveling to a place near San Francisco?
Book flights to San Francisco if you plan to visit one of these locationsSouth San Francisco
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Santa Cruz
Walnut Creek
Emeryville
San Bruno
Burlingame
Rancho Cordova
Roseville
Fairfield
Vallejo
Cupertino
Newark
Hayward
San Ramon
Redwood City
Manteca
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Turlock
Davis
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