$171+ 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 5/26. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SFO
Apr 2 — Apr 91
1 adult, Economy
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Find cheap flights from Islip to San Francisco 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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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 March 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 March 3, 2026.
This JetBlue deal was found by Cheapflights users on 3/2. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/33:07 pm
ISP
- SFO
1 stop11h 47m
JetBlue
Tue 9/88:35 pm
SFO
- ISP
1 stop11h 15m
JetBlue
Deal found 3/2![JetBlue logo]()
$450
This Southwest deal was found by Cheapflights users on 3/2. 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.
Sat 6/132:45 pm
ISP
- SFO
1 stop8h 20m
Southwest
Wed 6/178:25 am
SFO
- ISP
2 stops11h 10m
Southwest
Deal found 3/2![Southwest logo]()
$474
This Southwest deal was found by Cheapflights users on 2/26. 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 3/125:55 pm
ISP
- SFO
1 stop8h 45m
Southwest
Mon 3/1611:25 pm
SFO
- ISP
2 stops9h 15m
Southwest
Deal found 2/26![Southwest logo]()
$572
This Southwest deal was found by Cheapflights users on 2/26. 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 3/145:50 pm
ISP
- SFO
2 stops16h 05m
Southwest
Wed 3/189:35 am
SFO
- ISP
2 stops10h 15m
Southwest
Deal found 2/26![Southwest logo]()
$583
This Southwest deal was found by Cheapflights users on 2/28. 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 3/165:55 pm
ISP
- SFO
1 stop8h 45m
Southwest
Fri 3/2011:25 pm
SFO
- ISP
2 stops9h 15m
Southwest
Deal found 2/28![Southwest logo]()
$632
This Kiwi.com deal was found by Cheapflights users on 3/2. 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.
Sat 6/1310:03 am
ISP
- SFO
1 stop15h 49m
Multiple Airlines
Wed 6/1712:22 pm
SFO
- ISP
1 stop26h 44m
Multiple Airlines
Deal found 3/2![Multiple Airlines logo]()
$660
This CheapOair deal was found by Cheapflights users on 2/26. 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.
Fri 6/510:03 am
ISP
- SFO
1 stop15h 49m
Frontier
Mon 6/1511:59 pm
SFO
- ISP
1 stop30h 09m
Frontier
Deal found 2/26![Frontier logo]()
$744
This JetBlue deal was found by Cheapflights users on 2/26. 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 3/81:25 pm
ISP
- SFO
1 stop13h 34m
JetBlue
Fri 3/1311:12 am
SFO
- ISP
1 stop9h 34m
JetBlue
Deal found 2/26![JetBlue logo]()
$769
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 March 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 March 3, 2026.
This Southwest deal was found by Cheapflights users on 2/26. 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 3/145:50 pm
ISP
- SFO
1 stop9h 05m
Southwest
Wed 3/1811:25 pm
SFO
- ISP
2 stops9h 15m
Southwest
Deal found 2/26![Southwest logo]()
$572
This Gotogate deal was found by Cheapflights users on 3/2. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/132:33 pm
ISP
- SFO
2 stops24h 29m
Breeze Airways
Wed 6/1712:22 pm
SFO
- ISP
3 stops27h 45m
Breeze Airways
Deal found 3/2![Breeze Airways logo]()
$832
This Southwest deal was found by Cheapflights users on 2/28. 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 3/165:55 pm
ISP
- SFO
1 stop8h 45m
Southwest
Fri 3/209:20 pm
SFO
- ISP
1 stop11h 20m
Southwest
Deal found 2/28![Southwest logo]()
$632
This Southwest deal was found by Cheapflights users on 3/1. 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.
Tue 3/174:40 pm
ISP
- SFO
1 stop8h 25m
Southwest
Sat 3/2110:50 am
SFO
- ISP
2 stops9h 45m
Southwest
Deal found 3/1![Southwest logo]()
$777
This KAYAK deal was found by Cheapflights users on 3/1. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/128:43 pm
ISP
- SFO
2 stops17h 54m
Breeze Airways
Tue 6/1612:47 pm
SFO
- ISP
2 stops21h 46m
Breeze Airways
Deal found 3/1![Breeze Airways logo]()
$866
This KAYAK deal was found by Cheapflights users on 2/28. 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.
Fri 5/153:50 pm
ISP
- SFO
2 stops22h 47m
Breeze Airways
Wed 5/2012:22 pm
SFO
- ISP
1 stop26h 44m
Breeze Airways
Deal found 2/28![Breeze Airways logo]()
$896
This KAYAK deal was found by Cheapflights users on 2/28. 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.
Tue 6/3011:56 am
ISP
- SFO
3 stops26h 41m
Breeze Airways
Sat 7/412:22 pm
SFO
- ISP
3 stops27h 45m
Breeze Airways
Deal found 2/28![Breeze Airways logo]()
$897
Last-minute flights from Islip to San FranciscoDiscover last-minute flight deals from Islip to San Francisco. Data last updated March 3, 2026 and is based on user searches.
Discover last-minute flight deals from Islip to San Francisco. Data last updated March 3, 2026 and is based on user searches.
This JetBlue deal was found by Cheapflights users on 2/26. 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 3/81:25 pm
ISP
- SFO
1 stop13h 34m
JetBlue
Fri 3/1311:12 am
SFO
- ISP
1 stop9h 34m
JetBlue
Deal found 2/26![JetBlue logo]()
$769
This JetBlue deal was found by Cheapflights users on 3/1. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/101:25 pm
ISP
- SFO
1 stop13h 34m
JetBlue
Fri 3/1311:12 am
SFO
- ISP
1 stop9h 34m
JetBlue
Deal found 3/1![JetBlue logo]()
$788
This Southwest deal was found by Cheapflights users on 2/26. 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 3/125:55 pm
ISP
- SFO
1 stop8h 45m
Southwest
Mon 3/169:20 pm
SFO
- ISP
1 stop11h 20m
Southwest
Deal found 2/26![Southwest logo]()
$572
This Southwest deal was found by Cheapflights users on 3/2. 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.
Fri 3/135:55 pm
ISP
- SFO
1 stop8h 45m
Southwest
Sun 3/1510:10 am
SFO
- ISP
2 stops10h 40m
Southwest
Deal found 3/2![Southwest logo]()
$902
This Southwest deal was found by Cheapflights users on 2/26. 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 3/145:50 pm
ISP
- SFO
2 stops16h 05m
Southwest
Wed 3/189:35 am
SFO
- ISP
2 stops10h 15m
Southwest
Deal found 2/26![Southwest logo]()
$583
This Southwest deal was found by Cheapflights users on 2/28. 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 3/165:55 pm
ISP
- SFO
1 stop8h 45m
Southwest
Fri 3/2011:25 pm
SFO
- ISP
2 stops9h 15m
Southwest
Deal found 2/28![Southwest logo]()
$632
This Southwest deal was found by Cheapflights users on 3/1. 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.
Tue 3/174:40 pm
ISP
- SFO
1 stop8h 25m
Southwest
Sat 3/219:20 pm
SFO
- ISP
1 stop11h 25m
Southwest
Deal found 3/1![Southwest logo]()
$867
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 March 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 March 3, 2026.
This CheapOair deal was found by Cheapflights users on 2/26. 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 5/2610:03 am
ISP
- SFO
1 stop15h 49m
Frontier
Deal found 2/26![Frontier logo]()
$171
This Southwest deal was found by Cheapflights users on 3/1. 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.
Tue 4/74:05 pm
ISP
- SFO
1 stop8h 20m
Southwest
Deal found 3/1![Southwest logo]()
$190
This Southwest deal was found by Cheapflights users on 3/2. 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.
Sat 4/189:20 am
ISP
- SFO
1 stop8h 05m
Southwest
Deal found 3/2![Southwest logo]()
$224
This Trip.com deal was found by Cheapflights users on 2/26. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/85:08 pm
ISP
- SFO
2 stops25h 18m
Frontier
Deal found 2/26![Frontier logo]()
$258
This Kiwi.com deal was found by Cheapflights users on 2/26. 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 3/85:08 pm
ISP
- SFO
3 stops25h 18m
Multiple Airlines
Deal found 2/26![Multiple Airlines logo]()
$279
This Southwest deal was found by Cheapflights users on 3/1. 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.
Sun 4/511:45 am
ISP
- SFO
1 stop15h 05m
Southwest
Deal found 3/1![Southwest logo]()
$280
This Trip.com deal was found by Cheapflights users on 3/1. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/610:23 am
ISP
- SFO
2 stops31h 58m
Frontier
Deal found 3/1![Frontier logo]()
$283
This Southwest deal was found by Cheapflights users on 3/1. 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 4/14:40 pm
ISP
- SFO
1 stop8h 25m
Southwest
Deal found 3/1![Southwest logo]()
$311
This JetBlue deal was found by Cheapflights users on 3/2. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/91:25 pm
ISP
- SFO
1 stop13h 34m
JetBlue
Deal found 3/2![JetBlue logo]()
$373
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 March 3, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $474 (Southwest) |
One-way from | $171 (CheapOair) |
Popular in | December |
Cheapest in | January |
Average price | $367 |
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 March 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
IslipSan Francisco
ISP - SFO
ISPSFO
Islip Long Island
Sat 3/14
5:50 pm-11:55 pm
1 stop9h 05m
San Francisco
Wed 3/18
11:25 pm-11:40 am
2 stops9h 15m
$572
IslipSan Francisco
ISP - SFO
ISPSFO
Islip Long Island
Mon 3/16
5:55 pm-11:40 pm
1 stop8h 45m
San Francisco
Fri 3/20
9:20 pm-11:40 am
1 stop11h 20m
$632
IslipSan Francisco
ISP - SFO
ISPSFO
Islip Long Island
Tue 3/17
4:40 pm-10:05 pm
1 stop8h 25m
San Francisco
Sat 3/21
10:50 am-11:35 pm
2 stops9h 45m
$777
IslipSan Francisco
ISP - SFO
ISPSFO
Islip Long Island
Sat 6/13
2:33 pm-12:02 pm
2 stops24h 29m
San Francisco
Wed 6/17
12:22 pm-7:07 pm
3 stops27h 45m
$832
IslipSan Francisco
ISP - SFO
ISPSFO
Islip Long Island
Fri 6/12
8:43 pm-11:37 am
2 stops17h 54m
San Francisco
Tue 6/16
12:47 pm-1:33 pm
2 stops21h 46m
$866
IslipSan Francisco
ISP - SFO
ISPSFO
Islip Long Island
Fri 5/15
3:50 pm-11:37 am
2 stops22h 47m
San Francisco
Wed 5/20
12:22 pm-6:06 pm
1 stop26h 44m
$896
IslipSan Francisco
ISP - SFO
ISPSFO
Islip Long Island
Tue 6/30
11:56 am-11:37 am
3 stops26h 41m
San Francisco
Sat 7/4
12:22 pm-7:07 pm
3 stops27h 45m
$897
IslipSan Francisco
ISP - SFO
ISPSFO
Islip Long Island
Tue 5/26
10:03 am-10:52 pm
1 stop15h 49m
$171
IslipSan Francisco
ISP - SFO
ISPSFO
Islip Long Island
Tue 4/7
4:05 pm-9:25 pm
1 stop8h 20m
$190
IslipSan Francisco
ISP - SFO
ISPSFO
Islip Long Island
Wed 4/22
4:10 pm-9:25 pm
1 stop8h 15m
$190
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 March.
| 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.
Cheapflights Insights
Everything you need to know about your flight from Islip to San Francisco
Related info for your journey
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