$125+ Cheap flights from San Francisco to Islip, NY (SFO - ISP)
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 6/9. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — ISP
May 30 — Jun 61
Round-trip
1 adult, Economy
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Find cheap flights from San Francisco to Islip 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 San Francisco to Islip
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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 April 30, 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 April 30, 2026.
This CheapOair deal was found by Cheapflights users on 4/27. 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 7/78:51 pm
SFO
- ISP
1 stop10h 07m
Frontier
Wed 7/1510:48 am
ISP
- SFO
1 stop26h 27m
Frontier
Deal found 4/27![Frontier logo]()
$270
This CheapOair deal was found by Cheapflights users on 4/30. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/18:51 pm
SFO
- ISP
1 stop10h 12m
Frontier
Sat 9/510:48 am
ISP
- SFO
1 stop26h 41m
Frontier
Deal found 4/30![Frontier logo]()
$335
This CheapOair deal was found by Cheapflights users on 4/28. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/98:51 pm
SFO
- ISP
1 stop10h 12m
Frontier
Mon 6/1510:48 am
ISP
- SFO
1 stop26h 46m
Frontier
Deal found 4/28![Frontier logo]()
$355
This Southwest deal was found by Cheapflights users on 4/29. 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 5/2710:40 pm
SFO
- ISP
2 stops10h 10m
Southwest
Mon 6/14:30 pm
ISP
- SFO
1 stop9h 50m
Southwest
Deal found 4/29![Southwest logo]()
$396
This Expedia deal was found by Cheapflights users on 4/27. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/128:51 pm
SFO
- ISP
1 stop10h 12m
Frontier
Sun 6/1410:48 am
ISP
- SFO
1 stop26h 46m
Frontier
Deal found 4/27![Frontier logo]()
$415
This Expedia deal was found by Cheapflights users on 4/26. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/98:51 pm
SFO
- ISP
1 stop10h 12m
Frontier
Sun 6/1410:48 am
ISP
- SFO
1 stop26h 46m
Frontier
Deal found 4/26![Frontier logo]()
$420
This Trip.com deal was found by Cheapflights users on 4/26. 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.
Wed 5/2711:36 am
SFO
- ISP
2 stops19h 29m
Frontier
Mon 6/111:00 am
ISP
- SFO
2 stops40h 23m
Frontier
Deal found 4/26![Frontier logo]()
$424
This Kiwi.com deal was found by Cheapflights users on 4/26. 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.
Tue 6/1612:38 pm
SFO
- ISP
2 stops18h 25m
Frontier
Tue 6/234:41 pm
ISP
- SFO
1 stop20h 53m
Frontier
Deal found 4/26![Frontier logo]()
$440
This CheapOair deal was found by Cheapflights users on 4/27. 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.
Wed 6/178:51 pm
SFO
- ISP
1 stop10h 12m
Frontier
Tue 6/234:41 pm
ISP
- SFO
1 stop20h 53m
Frontier
Deal found 4/27![Frontier logo]()
$444
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 April 30, 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 April 30, 2026.
This Southwest deal was found by Cheapflights users on 4/26. 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.
Wed 5/277:20 am
SFO
- ISP
2 stops11h 50m
Southwest
Mon 6/14:30 pm
ISP
- SFO
1 stop9h 50m
Southwest
Deal found 4/26![Southwest logo]()
$438
This Southwest deal was found by Cheapflights users on 4/28. 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.
Tue 7/79:10 pm
SFO
- ISP
1 stop7h 55m
Southwest
Wed 7/1512:25 pm
ISP
- SFO
1 stop10h 25m
Southwest
Deal found 4/28![Southwest logo]()
$467
This Southwest deal was found by Cheapflights users on 4/26. 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.
Tue 6/169:10 pm
SFO
- ISP
1 stop7h 55m
Southwest
Tue 6/232:55 pm
ISP
- SFO
1 stop7h 55m
Southwest
Deal found 4/26![Southwest logo]()
$467
This Southwest deal was found by Cheapflights users on 4/29. 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 7/299:10 pm
SFO
- ISP
1 stop8h 10m
Southwest
Sat 8/13:30 pm
ISP
- SFO
2 stops11h 00m
Southwest
Deal found 4/29![Southwest logo]()
$472
This Southwest deal was found by Cheapflights users on 4/29. 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 10/911:40 pm
SFO
- ISP
2 stops12h 55m
Southwest
Mon 10/126:00 am
ISP
- SFO
1 stop8h 15m
Southwest
Deal found 4/29![Southwest logo]()
$472
This Southwest deal was found by Cheapflights users on 4/28. 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 7/66:10 pm
SFO
- ISP
2 stops10h 55m
Southwest
Tue 7/214:40 pm
ISP
- SFO
2 stops9h 35m
Southwest
Deal found 4/28![Southwest logo]()
$477
This Southwest deal was found by Cheapflights users on 4/29. 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 5/2210:55 pm
SFO
- ISP
2 stops9h 40m
Southwest
Wed 5/274:10 pm
ISP
- SFO
2 stops10h 05m
Southwest
Deal found 4/29![Southwest logo]()
$479
Last-minute flights from San Francisco to IslipDiscover last-minute flight deals from San Francisco to Islip. Data last updated April 30, 2026 and is based on user searches.
Discover last-minute flight deals from San Francisco to Islip. Data last updated April 30, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 4/29. 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 5/1510:55 pm
SFO
- ISP
2 stops9h 40m
Southwest
Tue 5/196:30 am
ISP
- SFO
2 stops11h 00m
Southwest
Deal found 4/29![Southwest logo]()
$597
This Southwest deal was found by Cheapflights users on 4/29. 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 5/1811:25 pm
SFO
- ISP
2 stops11h 25m
Southwest
Sat 5/239:20 am
ISP
- SFO
2 stops12h 15m
Southwest
Deal found 4/29![Southwest logo]()
$573
This Southwest deal was found by Cheapflights users on 4/29. 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 5/2210:55 pm
SFO
- ISP
2 stops9h 40m
Southwest
Wed 5/274:10 pm
ISP
- SFO
2 stops10h 05m
Southwest
Deal found 4/29![Southwest logo]()
$479
This Southwest deal was found by Cheapflights users on 4/29. 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 5/2710:40 pm
SFO
- ISP
2 stops10h 10m
Southwest
Mon 6/14:30 pm
ISP
- SFO
1 stop9h 50m
Southwest
Deal found 4/29![Southwest logo]()
$396
This Trip.com deal was found by Cheapflights users on 4/26. 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.
Wed 5/2711:36 am
SFO
- ISP
2 stops19h 29m
Frontier
Mon 6/111:00 am
ISP
- SFO
2 stops40h 23m
Frontier
Deal found 4/26![Frontier logo]()
$424
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 April 30, 2026.
Search for one-way flight options from San Francisco to Islip. Find affordable one-way fares based on user searches. Data last updated April 30, 2026.
This CheapOair deal was found by Cheapflights users on 4/28. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/98:51 pm
SFO
- ISP
1 stop10h 12m
Frontier
Deal found 4/28![Frontier logo]()
$125
This Frontier deal was found by Cheapflights users on 4/29. 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 6/88:44 pm
SFO
- ISP
1 stop16h 12m
Frontier
Deal found 4/29![Frontier logo]()
$151
This Southwest deal was found by Cheapflights users on 4/27. 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 8/1110:30 pm
SFO
- ISP
1 stop8h 45m
Southwest
Deal found 4/27![Southwest logo]()
$192
This Kiwi.com deal was found by Cheapflights users on 4/26. 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.
Fri 5/1510:40 pm
SFO
- ISP
2 stops32h 47m
Frontier
Deal found 4/26![Frontier logo]()
$197
This CheapOair deal was found by Cheapflights users on 4/26. 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 6/308:51 pm
SFO
- ISP
1 stop10h 12m
Frontier
Deal found 4/26![Frontier logo]()
$210
This Kiwi.com deal was found by Cheapflights users on 4/26. 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 5/1010:40 pm
SFO
- ISP
3 stops35h 48m
Multiple Airlines
Deal found 4/26![Multiple Airlines logo]()
$219
This Kiwi.com deal was found by Cheapflights users on 4/29. 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 7/96:00 am
SFO
- ISP
2 stops24h 58m
Frontier
Deal found 4/29![Frontier logo]()
$224
This Kiwi.com deal was found by Cheapflights users on 4/29. 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 7/97:11 pm
SFO
- ISP
3 stops37h 06m
Multiple Airlines
Deal found 4/29![Multiple Airlines logo]()
$238
This Southwest deal was found by Cheapflights users on 4/26. 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.
Wed 7/18:55 am
SFO
- ISP
2 stops10h 40m
Southwest
Deal found 4/26![Southwest logo]()
$239
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 April 30, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $270 (CheapOair) |
One-way from | $125 (CheapOair) |
Popular in | December |
Cheapest in | January |
Average price | $401 |
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 2,558,603 searches. Data last updated April 30, 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 - ISP
SFOISP
San Francisco
Wed 5/27
7:20 am-10:10 pm
2 stops11h 50m
Islip Long Island
Mon 6/1
4:30 pm-11:20 pm
1 stop9h 50m
$438
San FranciscoIslip
SFO - ISP
SFOISP
San Francisco
Tue 7/7
9:10 pm-8:05 am
1 stop7h 55m
Islip Long Island
Wed 7/15
12:25 pm-7:50 pm
1 stop10h 25m
$467
Quickest round-trip
San FranciscoIslip
SFO - ISP
SFOISP
San Francisco
Tue 6/16
9:10 pm-8:05 am
1 stop7h 55m
Islip Long Island
Tue 6/23
2:55 pm-7:50 pm
1 stop7h 55m
$467
San FranciscoIslip
SFO - ISP
SFOISP
San Francisco
Wed 7/29
9:10 pm-8:20 am
1 stop8h 10m
Islip Long Island
Sat 8/1
3:30 pm-11:30 pm
2 stops11h 00m
$472
San FranciscoIslip
SFO - ISP
SFOISP
San Francisco
Fri 10/9
11:40 pm-3:35 pm
2 stops12h 55m
Islip Long Island
Mon 10/12
6:00 am-11:15 am
1 stop8h 15m
$472
San FranciscoIslip
SFO - ISP
SFOISP
San Francisco
Mon 7/6
6:10 pm-8:05 am
2 stops10h 55m
Islip Long Island
Tue 7/21
4:40 pm-11:15 pm
2 stops9h 35m
$477
San FranciscoIslip
SFO - ISP
SFOISP
San Francisco
Fri 5/22
10:55 pm-11:35 am
2 stops9h 40m
Islip Long Island
Wed 5/27
4:10 pm-11:15 pm
2 stops10h 05m
$479
Cheapest one-way
San FranciscoIslip
SFO - ISP
SFOISP
San Francisco
Thu 7/9
7:11 pm-11:17 am
3 stops37h 06m
$238
Quickest one-way
San FranciscoIslip
SFO - ISP
SFOISP
San Francisco
Wed 7/1
8:55 am-10:35 pm
2 stops10h 40m
$239
San FranciscoIslip
SFO - ISP
SFOISP
San Francisco
Sun 5/10
9:15 pm-11:50 am
1 stop11h 35m
$299
Showing 1-10 of 17 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 April.
| 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 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 April 30, 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.
Crew
8.6
Entertainment
7.5
Boarding
8.1
Comfort
8.0
Food
7.0
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Crew
8.6
Entertainment
7.5
Boarding
8.1
Comfort
8.0
Food
7.0
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
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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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 2,558,603 searches. Data last updated April 30, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$318 | Average$487 | FlexibilityNo cancel fee | On-time63% |