$174+ 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 8/29. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SFO
Sep 4 — Sep 111
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
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
Cheapest
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 August 5, 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 5, 2026.
This Southwest deal was found by Cheapflights users on 8/5. 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 8/5![Southwest logo]()
$380
This Southwest deal was found by Cheapflights users on 8/4. 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 8/4![Southwest logo]()
$412
This Southwest deal was found by Cheapflights users on 8/4. 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 9/46:10 am -
1 stop9h 50m
Mon 9/710:30 pm -
1 stop8h 45m
Deal found 8/4![Southwest logo]()
$413
This Expedia deal was found by Cheapflights users on 8/3. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/34:58 pm -
1 stop9h 53m
Thu 9/1010:24 am -
1 stop9h 58m
Deal found 8/3![JetBlue logo]()
$427
This Southwest deal was found by Cheapflights users on 8/3. 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 9/34:05 pm -
2 stops9h 50m
Thu 9/1010:30 pm -
1 stop8h 10m
Deal found 8/3![Southwest logo]()
$450
This Southwest deal was found by Cheapflights users on 8/1. 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.
Thu 9/36:10 am -
1 stop9h 50m
Sun 9/67:25 pm -
2 stops11h 15m
Deal found 8/1![Southwest logo]()
$482
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 5, 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 5, 2026.
This Southwest deal was found by Cheapflights users on 8/5. 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 -
2 stops10h 45m
Mon 9/710:30 pm -
1 stop8h 45m
Deal found 8/5![Southwest logo]()
$385
This Southwest deal was found by Cheapflights users on 8/4. 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 8/4![Southwest logo]()
$412
This Southwest deal was found by Cheapflights users on 8/3. 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 9/34:05 pm -
2 stops9h 50m
Thu 9/107:55 pm -
2 stops10h 45m
Deal found 8/3![Southwest logo]()
$455
This Southwest deal was found by Cheapflights users on 8/4. 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 9/44:05 pm -
2 stops9h 50m
Mon 9/710:30 pm -
1 stop8h 45m
Deal found 8/4![Southwest logo]()
$501
This Southwest deal was found by Cheapflights users on 8/1. 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.
Thu 9/36:10 am -
1 stop9h 50m
Sun 9/610:30 pm -
1 stop8h 10m
Deal found 8/1![Southwest logo]()
$528
This Southwest deal was found by Cheapflights users on 7/31. 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.
Mon 8/1712:35 pm -
2 stops9h 30m
Wed 8/1910:30 pm -
1 stop8h 10m
Deal found 7/31![Southwest logo]()
$629
This Southwest deal was found by Cheapflights users on 8/1. 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 8/1712:35 pm -
2 stops9h 30m
Fri 8/2111:40 pm -
2 stops11h 50m
Deal found 8/1![Southwest logo]()
$634
Last-minute flights from Islip to San FranciscoDiscover last-minute flight deals from Islip to San Francisco. Data last updated August 5, 2026 and is based on user searches.
Discover last-minute flight deals from Islip to San Francisco. Data last updated August 5, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 8/5. 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 8/5![Southwest logo]()
$380
This Expedia deal was found by Cheapflights users on 8/3. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/34:58 pm -
1 stop9h 53m
Thu 9/1010:24 am -
1 stop9h 58m
Deal found 8/3![JetBlue logo]()
$427
This Southwest deal was found by Cheapflights users on 8/3. 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 9/34:05 pm -
2 stops9h 50m
Thu 9/1010:30 pm -
1 stop8h 10m
Deal found 8/3![Southwest logo]()
$450
This Southwest deal was found by Cheapflights users on 8/1. 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.
Thu 9/36:10 am -
1 stop9h 50m
Sun 9/67:25 pm -
2 stops11h 15m
Deal found 8/1![Southwest logo]()
$482
This Southwest deal was found by Cheapflights users on 8/4. 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 9/46:10 am -
1 stop9h 50m
Mon 9/710:30 pm -
1 stop8h 45m
Deal found 8/4![Southwest logo]()
$413
This Southwest deal was found by Cheapflights users on 8/4. 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 8/4![Southwest logo]()
$412
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 5, 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 5, 2026.
This Southwest deal was found by Cheapflights users on 8/2. 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 8/295:30 am -
1 stop8h 25m
Deal found 8/2![Southwest logo]()
$174
This Southwest deal was found by Cheapflights users on 8/2. 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.
Mon 8/316:10 am -
1 stop9h 50m
Deal found 8/2![Southwest logo]()
$207
This JetBlue deal was found by Cheapflights users on 8/3. 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 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 8/3![JetBlue logo]()
$214
This Kiwi.com deal was found by Cheapflights users on 8/4. 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.
Mon 8/242:28 pm -
2 stops48h 24m
Deal found 8/4![Multiple Airlines logo]()
$219
This Southwest deal was found by Cheapflights users on 8/4. 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 8/196:05 am -
1 stop8h 30m
Deal found 8/4![Southwest logo]()
$299
This JetBlue deal was found by Cheapflights users on 8/1. 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.
Thu 9/34:58 pm -
1 stop9h 53m
Deal found 8/1![JetBlue logo]()
$303
This JetBlue deal was found by Cheapflights users on 8/3. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/304:58 pm -
1 stop9h 53m
Deal found 8/3![JetBlue logo]()
$309
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 5, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $380 (Southwest) |
One-way from | $174 (Southwest) |
Popular in | June |
Cheapest in | January |
Average price | $489 |
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 5, 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 9/1
6:05 am-1:50 pm
2 stops10h 45m
San Francisco
Mon 9/7
10:30 pm-10:15 am
1 stop8h 45m
$385
IslipSan Francisco
ISP Islip Long Island - SFO San Francisco
ISPSFO
Islip Long Island
Thu 9/17
6:10 am-1:00 pm
1 stop9h 50m
San Francisco
Mon 9/21
10:30 pm-10:15 am
1 stop8h 45m
$412
IslipSan Francisco
ISP Islip Long Island - SFO San Francisco
ISPSFO
Islip Long Island
Thu 9/3
4:05 pm-10:55 pm
2 stops9h 50m
San Francisco
Thu 9/10
7:55 pm-9:40 am
2 stops10h 45m
$455
IslipSan Francisco
ISP Islip Long Island - SFO San Francisco
ISPSFO
Islip Long Island
Fri 9/4
4:05 pm-10:55 pm
2 stops9h 50m
San Francisco
Mon 9/7
10:30 pm-10:15 am
1 stop8h 45m
$501
IslipSan Francisco
ISP Islip Long Island - SFO San Francisco
ISPSFO
Islip Long Island
Thu 9/3
6:10 am-1:00 pm
1 stop9h 50m
San Francisco
Sun 9/6
10:30 pm-9:40 am
1 stop8h 10m
$528
Quickest round-trip
IslipSan Francisco
ISP Islip Long Island - SFO San Francisco
ISPSFO
Islip Long Island
Mon 8/17
12:35 pm-7:05 pm
2 stops9h 30m
San Francisco
Wed 8/19
10:30 pm-9:40 am
1 stop8h 10m
$629
IslipSan Francisco
ISP Islip Long Island - SFO San Francisco
ISPSFO
Islip Long Island
Mon 8/17
12:35 pm-7:05 pm
2 stops9h 30m
San Francisco
Fri 8/21
11:40 pm-2:30 pm
2 stops11h 50m
$634
Cheapest one-way
IslipSan Francisco
ISP Islip Long Island - SFO San Francisco
ISPSFO
Islip Long Island
Sat 8/29
11:55 am-7:35 pm
2 stops10h 40m
$179
IslipSan Francisco
ISP Islip Long Island - SFO San Francisco
ISPSFO
Islip Long Island
Tue 8/25
4:58 pm-11:51 pm
1 stop9h 53m
$214
IslipSan Francisco
ISP Islip Long Island - SFO San Francisco
ISPSFO
Islip Long Island
Mon 8/24
2:28 pm-11:52 am
2 stops48h 24m
$219
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 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
Santa Clara
Santa Cruz
San Bruno
Fairfield
Emeryville
Roseville
Burlingame
Rancho Cordova
Vallejo
Cupertino
Newark
Hayward
San Ramon
Redwood City
San Carlos
Milpitas
Turlock
San Lorenzo
Davis
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Other flights from Islip
Popular flights
San Francisco flight routes