$198+ 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 10/4. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SFO
Sep 10 — Sep 171
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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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 August 11, 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 August 11, 2026.
This Southwest deal was found by Cheapflights users on 8/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/296:05 am -
1 stop8h 30m
Tue 10/69:20 am -
2 stops10h 15m
Deal found 8/10![Southwest logo]()
$312
This Southwest deal was found by Cheapflights users on 8/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/195:30 am -
1 stop8h 25m
Mon 9/2110:30 pm -
1 stop8h 45m
Deal found 8/10![Southwest logo]()
$392
This Southwest deal was found by Cheapflights users on 8/8. 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.
Sat 9/511:55 am -
2 stops10h 40m
Sat 9/1210:30 pm -
1 stop8h 25m
Deal found 8/8![Southwest logo]()
$399
This Southwest deal was found by Cheapflights users on 8/6. 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 9/16:05 am -
1 stop8h 30m
Mon 9/710:30 pm -
1 stop8h 45m
Deal found 8/6![Southwest logo]()
$412
This Kiwi.com deal was found by Cheapflights users on 8/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/105:43 pm -
2 stops24h 56m
Wed 9/1612:36 pm -
1 stop27h 15m
Deal found 8/10![Multiple Airlines logo]()
$413
This Kiwi.com deal was found by Cheapflights users on 8/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/33:43 pm -
2 stops26h 07m
Wed 11/1112:36 pm -
1 stop25h 57m
Deal found 8/9![Multiple Airlines logo]()
$436
This Kiwi.com deal was found by Cheapflights users on 8/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/510:57 am -
2 stops12h 49m
Sat 9/1212:36 pm -
1 stop27h 15m
Deal found 8/9![Multiple Airlines logo]()
$465
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 August 11, 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 August 11, 2026.
This Southwest deal was found by Cheapflights users on 8/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/296:05 am -
1 stop8h 30m
Tue 10/69:20 am -
2 stops10h 15m
Deal found 8/10![Southwest logo]()
$312
This Kiwi.com deal was found by Cheapflights users on 8/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/105:43 pm -
2 stops24h 56m
Wed 9/1612:36 pm -
1 stop27h 15m
Deal found 8/10![Multiple Airlines logo]()
$413
This Southwest deal was found by Cheapflights users on 8/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/1911:55 am -
2 stops10h 40m
Mon 9/217:10 pm -
2 stops12h 05m
Deal found 8/10![Southwest logo]()
$402
This Kiwi.com deal was found by Cheapflights users on 8/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/33:43 pm -
2 stops26h 07m
Wed 11/1112:36 pm -
1 stop25h 57m
Deal found 8/9![Multiple Airlines logo]()
$436
This Southwest deal was found by Cheapflights users on 8/8. 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.
Sat 9/511:55 am -
2 stops10h 40m
Sat 9/126:25 am -
2 stops11h 25m
Deal found 8/8![Southwest logo]()
$404
This Southwest deal was found by Cheapflights users on 8/7. 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 9/16:05 am -
1 stop8h 30m
Mon 9/710:30 pm -
1 stop8h 45m
Deal found 8/7![Southwest logo]()
$412
This Southwest deal was found by Cheapflights users on 8/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/106:10 am -
2 stops11h 00m
Wed 9/167:10 pm -
2 stops11h 30m
Deal found 8/10![Southwest logo]()
$487
This Southwest deal was found by Cheapflights users on 8/6. 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 10/136:05 am -
2 stops12h 05m
Sun 10/189:35 pm -
1 stop11h 10m
Deal found 8/6![Southwest logo]()
$488
Last-minute flights from Islip to San FranciscoDiscover last-minute flight deals from Islip to San Francisco. Data last updated August 11, 2026 and is based on user searches.
Discover last-minute flight deals from Islip to San Francisco. Data last updated August 11, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 8/6. 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 9/16:05 am -
1 stop8h 30m
Mon 9/710:30 pm -
1 stop8h 45m
Deal found 8/6![Southwest logo]()
$412
This Southwest deal was found by Cheapflights users on 8/8. 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.
Sat 9/511:55 am -
2 stops10h 40m
Sat 9/1210:30 pm -
1 stop8h 25m
Deal found 8/8![Southwest logo]()
$399
This Kiwi.com deal was found by Cheapflights users on 8/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/510:57 am -
2 stops12h 49m
Sat 9/1212:36 pm -
1 stop27h 15m
Deal found 8/9![Multiple Airlines logo]()
$465
This Kiwi.com deal was found by Cheapflights users on 8/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/105:43 pm -
2 stops24h 56m
Wed 9/1612:36 pm -
1 stop27h 15m
Deal found 8/10![Multiple Airlines logo]()
$413
This Southwest deal was found by Cheapflights users on 8/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/195:30 am -
1 stop8h 25m
Mon 9/2110:30 pm -
1 stop8h 45m
Deal found 8/10![Southwest logo]()
$392
This Southwest deal was found by Cheapflights users on 8/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/296:05 am -
1 stop8h 30m
Tue 10/69:20 am -
2 stops10h 15m
Deal found 8/10![Southwest logo]()
$312
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 August 11, 2026.
Search for one-way flight options from Islip to San Francisco. Find affordable one-way fares based on user searches. Data last updated August 11, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/45:43 pm -
2 stops43h 39m
Deal found 8/9![Frontier logo]()
$198
This Kiwi.com deal was found by Cheapflights users on 8/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/234:13 pm -
2 stops29h 07m
Deal found 8/9![Frontier logo]()
$204
This JetBlue deal was found by Cheapflights users on 8/7. 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.
Sun 9/64:58 pm -
1 stop9h 53m
Deal found 8/7![JetBlue logo]()
$219
This Southwest deal was found by Cheapflights users on 8/9. 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.
Fri 10/236:00 am -
1 stop11h 35m
Deal found 8/9![Southwest logo]()
$244
This Kiwi.com deal was found by Cheapflights users on 8/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/45:43 pm -
3 stops29h 05m
Deal found 8/9![Multiple Airlines logo]()
$249
This Southwest deal was found by Cheapflights users on 8/9. 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.
Sun 10/45:40 am -
1 stop9h 15m
Deal found 8/9![Southwest logo]()
$261
This Kiwi.com deal was found by Cheapflights users on 8/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/2611:57 am -
2 stops50h 55m
Deal found 8/10![Multiple Airlines logo]()
$267
This Southwest deal was found by Cheapflights users on 8/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/266:05 am -
1 stop8h 30m
Deal found 8/10![Southwest logo]()
$299
This JetBlue deal was found by Cheapflights users on 8/9. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/84:58 pm -
1 stop9h 53m
Deal found 8/9![JetBlue logo]()
$309
This JetBlue deal was found by Cheapflights users on 8/8. 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 8/254:58 pm -
1 stop9h 53m
Deal found 8/8![JetBlue logo]()
$325
This Thrive Travel deal was found by Cheapflights users on 8/6. 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 Thrive Travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/274:58 pm -
1 stop9h 53m
Deal found 8/6![JetBlue logo]()
$337
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 August 11, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $312 (Southwest) |
One-way from | $198 (Kiwi.com) |
Popular in | June |
Cheapest in | January |
Average price | $522 |
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 August 11, 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
Tue 9/29
6:05 am-11:35 am
1 stop8h 30m
San Francisco
Tue 10/6
9:20 am-10:35 pm
2 stops10h 15m
$312
IslipSan Francisco
ISP Islip Long Island - SFO San Francisco
ISPSFO
Islip Long Island
Sat 9/19
11:55 am-7:35 pm
2 stops10h 40m
San Francisco
Mon 9/21
7:10 pm-10:15 am
2 stops12h 05m
$402
IslipSan Francisco
ISP Islip Long Island - SFO San Francisco
ISPSFO
Islip Long Island
Sat 9/5
11:55 am-7:35 pm
2 stops10h 40m
San Francisco
Sat 9/12
6:25 am-8:50 pm
2 stops11h 25m
$404
Quickest round-trip
IslipSan Francisco
ISP Islip Long Island - SFO San Francisco
ISPSFO
Islip Long Island
Tue 9/1
6:05 am-11:35 am
1 stop8h 30m
San Francisco
Mon 9/7
10:30 pm-10:15 am
1 stop8h 45m
$412
IslipSan Francisco
ISP Islip Long Island - SFO San Francisco
ISPSFO
Islip Long Island
Thu 9/10
5:43 pm-3:39 pm
2 stops24h 56m
San Francisco
Wed 9/16
12:36 pm-6:51 pm
1 stop27h 15m
$413
IslipSan Francisco
ISP Islip Long Island - SFO San Francisco
ISPSFO
Islip Long Island
Tue 11/3
3:43 pm-2:50 pm
2 stops26h 07m
San Francisco
Wed 11/11
12:36 pm-5:33 pm
1 stop25h 57m
$436
IslipSan Francisco
ISP Islip Long Island - SFO San Francisco
ISPSFO
Islip Long Island
Thu 9/10
6:10 am-2:10 pm
2 stops11h 00m
San Francisco
Wed 9/16
7:10 pm-9:40 am
2 stops11h 30m
$487
IslipSan Francisco
ISP Islip Long Island - SFO San Francisco
ISPSFO
Islip Long Island
Tue 10/13
6:05 am-3:10 pm
2 stops12h 05m
San Francisco
Sun 10/18
9:35 pm-11:45 am
1 stop11h 10m
$488
Cheapest one-way
IslipSan Francisco
ISP Islip Long Island - SFO San Francisco
ISPSFO
Islip Long Island
Fri 10/23
6:00 am-2:35 pm
1 stop11h 35m
$244
IslipSan Francisco
ISP Islip Long Island - SFO San Francisco
ISPSFO
Islip Long Island
Sun 10/4
5:40 am-11:55 am
1 stop9h 15m
$261
Showing 1-10 of 18 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 August.
| 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
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Emeryville
Roseville
Burlingame
Rancho Cordova
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Cupertino
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