$216+ 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 9/1. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SFO
Jun 12 — Jun 191
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
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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 Islip to San Francisco
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Best
Last-minute
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 May 13, 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 May 13, 2026.
This CheapOair deal was found by Cheapflights users on 5/7. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/14:41 pm
ISP
- SFO
1 stop20h 48m
Frontier
Fri 9/48:51 pm
SFO
- ISP
1 stop10h 12m
Frontier
Deal found 5/7![Frontier logo]()
$355
This Southwest deal was found by Cheapflights users on 5/8. 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.
Tue 9/226:05 am
ISP
- SFO
1 stop8h 30m
Southwest
Sat 9/2610:30 pm
SFO
- ISP
1 stop8h 25m
Southwest
Deal found 5/8![Southwest logo]()
$397
This Orbitz deal was found by Cheapflights users on 5/9. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/2110:48 am
ISP
- SFO
1 stop26h 41m
Frontier
Fri 8/288:51 pm
SFO
- ISP
1 stop10h 12m
Frontier
Deal found 5/9![Frontier logo]()
$415
This Southwest deal was found by Cheapflights users on 5/11. 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.
Mon 10/126:00 am
ISP
- SFO
1 stop8h 15m
Southwest
Fri 10/309:40 pm
SFO
- ISP
1 stop10h 55m
Southwest
Deal found 5/11![Southwest logo]()
$472
This Southwest deal was found by Cheapflights users on 5/9. 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.
Wed 6/106:00 am
ISP
- SFO
2 stops10h 40m
Southwest
Thu 6/116:45 pm
SFO
- ISP
2 stops10h 35m
Southwest
Deal found 5/9![Southwest logo]()
$477
This Southwest deal was found by Cheapflights users on 5/9. 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.
Mon 6/14:30 pm
ISP
- SFO
1 stop9h 50m
Southwest
Mon 6/86:45 pm
SFO
- ISP
2 stops10h 20m
Southwest
Deal found 5/9![Southwest logo]()
$485
This Southwest deal was found by Cheapflights users on 5/9. 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.
Mon 6/812:30 pm
ISP
- SFO
2 stops11h 10m
Southwest
Mon 6/1510:50 pm
SFO
- ISP
2 stops10h 00m
Southwest
Deal found 5/9![Southwest logo]()
$487
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 May 13, 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 May 13, 2026.
This Southwest deal was found by Cheapflights users on 5/7. 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 7/142:55 pm
ISP
- SFO
1 stop7h 55m
Southwest
Sat 7/2511:40 pm
SFO
- ISP
2 stops12h 15m
Southwest
Deal found 5/7![Southwest logo]()
$472
This Southwest deal was found by Cheapflights users on 5/11. 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.
Mon 10/126:00 am
ISP
- SFO
1 stop8h 15m
Southwest
Fri 10/308:05 am
SFO
- ISP
2 stops12h 30m
Southwest
Deal found 5/11![Southwest logo]()
$472
This Southwest deal was found by Cheapflights users on 5/8. 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.
Fri 7/1012:30 pm
ISP
- SFO
2 stops10h 50m
Southwest
Mon 7/139:10 pm
SFO
- ISP
1 stop7h 55m
Southwest
Deal found 5/8![Southwest logo]()
$472
This Southwest deal was found by Cheapflights users on 5/9. 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.
Wed 6/106:00 am
ISP
- SFO
2 stops10h 40m
Southwest
Thu 6/116:45 pm
SFO
- ISP
2 stops10h 35m
Southwest
Deal found 5/9![Southwest logo]()
$477
This Southwest deal was found by Cheapflights users on 5/9. 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.
Mon 6/812:30 pm
ISP
- SFO
1 stop8h 00m
Southwest
Mon 6/159:10 pm
SFO
- ISP
1 stop7h 55m
Southwest
Deal found 5/9![Southwest logo]()
$528
Last-minute flights from Islip to San FranciscoDiscover last-minute flight deals from Islip to San Francisco. Data last updated May 13, 2026 and is based on user searches.
Discover last-minute flight deals from Islip to San Francisco. Data last updated May 13, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 5/9. 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.
Mon 6/14:30 pm
ISP
- SFO
1 stop9h 50m
Southwest
Mon 6/86:45 pm
SFO
- ISP
2 stops10h 20m
Southwest
Deal found 5/9![Southwest logo]()
$485
This Southwest deal was found by Cheapflights users on 5/12. 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 6/14:30 pm
ISP
- SFO
2 stops10h 40m
Southwest
Tue 6/3010:50 pm
SFO
- ISP
2 stops10h 00m
Southwest
Deal found 5/12![Southwest logo]()
$537
This Southwest deal was found by Cheapflights users on 5/9. 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.
Mon 6/812:30 pm
ISP
- SFO
2 stops11h 10m
Southwest
Mon 6/1510:50 pm
SFO
- ISP
2 stops10h 00m
Southwest
Deal found 5/9![Southwest logo]()
$487
This Southwest deal was found by Cheapflights users on 5/9. 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.
Wed 6/106:00 am
ISP
- SFO
2 stops10h 40m
Southwest
Thu 6/116:45 pm
SFO
- ISP
2 stops10h 35m
Southwest
Deal found 5/9![Southwest logo]()
$477
This Southwest deal was found by Cheapflights users on 5/11. 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.
Thu 6/1112:30 pm
ISP
- SFO
2 stops10h 50m
Southwest
Thu 6/1810:10 am
SFO
- ISP
2 stops10h 25m
Southwest
Deal found 5/11![Southwest logo]()
$535
This Southwest deal was found by Cheapflights users on 5/8. 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 6/2412:25 pm
ISP
- SFO
1 stop10h 25m
Southwest
Wed 6/249:10 pm
SFO
- ISP
1 stop8h 10m
Southwest
Deal found 5/8![Southwest logo]()
$513
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 May 13, 2026.
Search for one-way flight options from Islip to San Francisco. Find affordable one-way fares based on user searches. Data last updated May 13, 2026.
This CheapOair deal was found by Cheapflights users on 5/7. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/14:41 pm
ISP
- SFO
1 stop20h 48m
Frontier
Deal found 5/7![Frontier logo]()
$216
This Southwest deal was found by Cheapflights users on 5/11. 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.
Mon 8/246:10 am
ISP
- SFO
1 stop9h 50m
Southwest
Deal found 5/11![Southwest logo]()
$234
This Southwest deal was found by Cheapflights users on 5/8. 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.
Fri 7/1012:30 pm
ISP
- SFO
2 stops10h 50m
Southwest
Deal found 5/8![Southwest logo]()
$239
This Priceline deal was found by Cheapflights users on 5/9. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/2712:25 pm
ISP
- SFO
1 stop15h 08m
JetBlue
Deal found 5/9![JetBlue logo]()
$243
This JetBlue deal was found by Cheapflights users on 5/10. 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.
Tue 7/285:00 pm
ISP
- SFO
1 stop9h 50m
JetBlue
Deal found 5/10![JetBlue logo]()
$252
This Southwest deal was found by Cheapflights users on 5/11. 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.
Mon 8/312:30 pm
ISP
- SFO
2 stops11h 10m
Southwest
Deal found 5/11![Southwest logo]()
$261
This JetBlue deal was found by Cheapflights users on 5/12. 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 7/305:00 pm
ISP
- SFO
1 stop9h 50m
JetBlue
Deal found 5/12![JetBlue logo]()
$283
This Southwest deal was found by Cheapflights users on 5/9. 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.
Wed 5/274:10 pm
ISP
- SFO
1 stop8h 15m
Southwest
Deal found 5/9![Southwest logo]()
$294
This JetBlue deal was found by Cheapflights users on 5/12. 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.
Wed 6/243:07 pm
ISP
- SFO
1 stop11h 47m
JetBlue
Deal found 5/12![JetBlue logo]()
$310
This JetBlue deal was found by Cheapflights users on 5/11. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/173:07 pm
ISP
- SFO
1 stop11h 47m
JetBlue
Deal found 5/11![JetBlue logo]()
$312
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 May 13, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $397 (Southwest) |
One-way from | $216 (CheapOair) |
Popular in | May |
Cheapest in | January |
Average price | $484 |
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 May 13, 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 - SFO
ISPSFO
Islip Long Island
Tue 7/14
2:55 pm-7:50 pm
1 stop7h 55m
San Francisco
Sat 7/25
11:40 pm-2:55 pm
2 stops12h 15m
$472
IslipSan Francisco
ISP - SFO
ISPSFO
Islip Long Island
Mon 10/12
6:00 am-11:15 am
1 stop8h 15m
San Francisco
Fri 10/30
8:05 am-11:35 pm
2 stops12h 30m
$472
IslipSan Francisco
ISP - SFO
ISPSFO
Islip Long Island
Fri 7/10
12:30 pm-8:20 pm
2 stops10h 50m
San Francisco
Mon 7/13
9:10 pm-8:05 am
1 stop7h 55m
$472
IslipSan Francisco
ISP - SFO
ISPSFO
Islip Long Island
Wed 6/10
6:00 am-1:40 pm
2 stops10h 40m
San Francisco
Thu 6/11
6:45 pm-8:20 am
2 stops10h 35m
$477
Quickest round-trip
IslipSan Francisco
ISP - SFO
ISPSFO
Islip Long Island
Mon 6/8
12:30 pm-5:30 pm
1 stop8h 00m
San Francisco
Mon 6/15
9:10 pm-8:05 am
1 stop7h 55m
$528
Cheapest one-way
IslipSan Francisco
ISP - SFO
ISPSFO
Islip Long Island
Fri 7/10
12:30 pm-8:20 pm
2 stops10h 50m
$239
Quickest one-way
IslipSan Francisco
ISP - SFO
ISPSFO
Islip Long Island
Thu 7/30
5:00 pm-11:50 pm
1 stop9h 50m
$283
IslipSan Francisco
ISP - SFO
ISPSFO
Islip Long Island
Wed 5/27
12:30 pm-7:55 pm
2 stops10h 25m
$299
IslipSan Francisco
ISP - SFO
ISPSFO
Islip Long Island
Thu 7/9
5:00 pm-11:50 pm
1 stop9h 50m
$310
IslipSan Francisco
ISP - SFO
ISPSFO
Islip Long Island
Thu 7/2
5:00 pm-11:54 pm
1 stop9h 54m
$310
Showing 1-10 of 15 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 May.
| 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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