Latest deals
Insights
When to book
FAQs
Price Alerts

Cheap flights from Islip, New York to San Francisco from $131

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Islip, New York to San Francisco departing on 5/20. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Islip, New York to San Francisco

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
4:41 pm - 10:29 am
ISP
-
SFO
20h 48m
1 stop
Frontier Logo
8:51 pm - 10:03 am
SFO
-
ISP
10h 12m
1 stop
$355Frontier
Tue, Jun 16 - Wed, Jun 24
Frontier Logo
11:00 am - 10:41 am
ISP
-
SFO
26h 41m
1 stop
Frontier Logo
8:44 pm - 3:56 pm
SFO
-
ISP
16h 12m
1 stop
$370Frontier
Wed, Jun 3 - Mon, Jun 8
Southwest Logo
4:10 pm - 9:25 pm
ISP
-
SFO
8h 15m
1 stop
Southwest Logo
9:15 pm - 1:50 pm
SFO
-
ISP
13h 35m
1 stop
$388Southwest
Tue, May 5 - Tue, May 12
Southwest Logo
4:10 pm - 11:35 pm
ISP
-
SFO
10h 25m
2 stops
Southwest Logo
11:25 pm - 1:50 pm
SFO
-
ISP
11h 25m
2 stops
$393Southwest
Tue, May 5 - Tue, May 12
Southwest Logo
4:10 pm - 9:25 pm
ISP
-
SFO
8h 15m
1 stop
Southwest Logo
6:10 pm - 8:05 am
SFO
-
ISP
10h 55m
2 stops
$396Southwest
Wed, Jun 3 - Mon, Jun 8
Southwest Logo
12:30 pm - 7:55 pm
ISP
-
SFO
10h 25m
2 stops
Southwest Logo
10:50 pm - 11:50 am
SFO
-
ISP
10h 00m
2 stops
$401Southwest
Wed, Jun 3 - Mon, Jun 8
Southwest Logo
4:30 pm - 11:20 pm
ISP
-
SFO
9h 50m
1 stop
Southwest Logo
9:15 pm - 1:50 pm
SFO
-
ISP
13h 35m
1 stop
$404Southwest
Thu, Apr 23 - Mon, Apr 27
Southwest Logo
4:30 pm - 12:10 am
ISP
-
SFO
10h 40m
2 stops
Southwest Logo
11:25 pm - 11:55 am
SFO
-
ISP
9h 30m
2 stops
$409Southwest
Thu, Apr 23 - Mon, Apr 27
Southwest Logo
12:15 pm - 8:05 pm
ISP
-
SFO
10h 50m
1 stop
Southwest Logo
9:10 pm - 8:05 am
SFO
-
ISP
7h 55m
1 stop
$467Southwest
Sat, Jun 20 - Tue, Jun 30
Southwest Logo
3:30 pm - 11:30 pm
ISP
-
SFO
11h 00m
2 stops
Southwest Logo
9:10 pm - 8:05 am
SFO
-
ISP
7h 55m
1 stop
$472Southwest
Sat, Jun 20 - Tue, Jun 30

Frontier flights from Islip, New York to San Francisco

Our best Frontier deals on Islip, New York to San Francisco flight tickets
Frontier
Jun 16
ISP4:41 pmIslip Long Island
20h 48m
1 stop
SFO10:29 amSan Francisco
Jun 24
SFO8:51 pmSan Francisco
10h 12m
1 stop
ISP10:03 amIslip Long Island
$355
Frontier
Jun 3
ISP11:00 amIslip Long Island
26h 41m
1 stop
SFO10:41 amSan Francisco
Jun 8
SFO8:44 pmSan Francisco
16h 12m
1 stop
ISP3:56 pmIslip Long Island
$370
Frontier
Jul 18
ISP10:48 amIslip Long Island
26h 41m
1 stop
SFO10:29 amSan Francisco
Jul 22
SFO8:51 pmSan Francisco
10h 12m
1 stop
ISP10:03 amIslip Long Island
$710

Southwest flights from Islip, New York to San Francisco

Our best Southwest deals on Islip, New York to San Francisco flight tickets
Southwest
May 5
ISP4:10 pmIslip Long Island
8h 15m
1 stop
SFO9:25 pmSan Francisco
May 12
SFO9:15 pmSan Francisco
13h 35m
1 stop
ISP1:50 pmIslip Long Island
$388
Southwest
May 5
ISP4:10 pmIslip Long Island
10h 25m
2 stops
SFO11:35 pmSan Francisco
May 12
SFO11:25 pmSan Francisco
11h 25m
2 stops
ISP1:50 pmIslip Long Island
$393
Southwest
Jun 3
ISP4:10 pmIslip Long Island
8h 15m
1 stop
SFO9:25 pmSan Francisco
Jun 8
SFO6:10 pmSan Francisco
10h 55m
2 stops
ISP8:05 amIslip Long Island
$396

momondo Fare Finder

 
Customize your flight search to find flights from Islip, New York 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, momondo users made 832,500 searches. Data last updated March 23, 2026.
Use the filters below to find and compare flights from Islip, New York to San Francisco that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Tue 6/16

4:41 pm-10:29 am

1 stop20h 48m

San Francisco

Wed 6/24

8:51 pm-10:03 am

1 stop10h 12m

$355

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Wed 6/3

11:00 am-10:41 am

1 stop26h 41m

San Francisco

Mon 6/8

8:44 pm-3:56 pm

1 stop16h 12m

$370

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Tue 5/5

4:10 pm-9:25 pm

1 stop8h 15m

San Francisco

Tue 5/12

9:15 pm-1:50 pm

1 stop13h 35m

$388

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Tue 5/5

4:10 pm-11:35 pm

2 stops10h 25m

San Francisco

Tue 5/12

11:25 pm-1:50 pm

2 stops11h 25m

$393

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Wed 6/3

4:10 pm-9:25 pm

1 stop8h 15m

San Francisco

Mon 6/8

6:10 pm-8:05 am

2 stops10h 55m

$396

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Wed 6/3

12:30 pm-7:55 pm

2 stops10h 25m

San Francisco

Mon 6/8

10:50 pm-11:50 am

2 stops10h 00m

$401

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Thu 4/23

4:30 pm-11:20 pm

1 stop9h 50m

San Francisco

Mon 4/27

9:15 pm-1:50 pm

1 stop13h 35m

$404

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Thu 4/23

4:30 pm-12:10 am

2 stops10h 40m

San Francisco

Mon 4/27

11:25 pm-11:55 am

2 stops9h 30m

$409
Quickest round-trip

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Sat 6/20

12:15 pm-8:05 pm

1 stop10h 50m

San Francisco

Tue 6/30

9:10 pm-8:05 am

1 stop7h 55m

$467

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Sat 6/20

3:30 pm-11:30 pm

2 stops11h 00m

San Francisco

Tue 6/30

9:10 pm-8:05 am

1 stop7h 55m

$472

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

See travel insights to San Francisco from

How to get the cheapest flight ticket from Islip, New York to San Francisco

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to San Francisco?

The cheapest day to depart from Islip, New York to San Francisco is on a Thursday when prices can be found for as low as $405. The most expensive day to fly to San Francisco is Sunday, with ticket prices averaging around $579.

What is the cheapest time of day to depart on your flight to San Francisco?

Our data shows that the cheapest Islip, New York to San Francisco flights are usually those with departure times in the evening. Our users have found flights to San Francisco in the evening for as low as $391. Flights in the afternoon are often more expensive with an average ticket price of $485.

Can stopping save me money on Islip, New York to San Francisco flights?

You could potentially save up to 63% on your flight if you consider stops on a Islip, New York to San Francisco flight.

When to book flights from Islip, New York to San Francisco

Are you open to changing your travel dates? Check out the ideal times to fly from Islip, New York to San Francisco according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Islip, New York to San Francisco (ISP to SFO) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Islip, New York to San Francisco

Fastest flight time

8h 15m

Direct flights

None
The fastest flight from Islip, New York to San Francisco takes 8h 15m
There are no direct flights from Islip, New York to San Francisco. There are no popular flight routes from Islip, New York to San Francisco.
Search flight deals

  • How far is Islip Long Island to San Francisco by plane?

    A flight from Islip Long Island to San Francisco will travel around 2603.7 mi. Flights usually cover this in 8h 15m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Islip Long Island Airport to San Francisco Airport?

    Prices for flights from Islip Long Island Airport to San Francisco Airport are refreshed on a daily basis.

  • How old do you have to be to fly from Islip Long Island Airport to San Francisco Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Islip Long Island Airport to San Francisco Airport.

  • What documentation or ID do you need to fly to San Francisco Airport?

    The required travel and health documents for your San Francisco Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at San Francisco Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Traveling to a place near San Francisco?

Book flights to San Francisco if you plan to visit one of these locations
Santa Cruz
Carmel-by-the-Sea
Modesto
Sonoma
Bodega Bay
Walnut Creek
Roseville
Hayward
Berkeley
Santa Clara
Big Sur
Fremont
Calistoga
Vallejo
Salinas
Half Moon Bay
Daly City
Milpitas
Pacific Grove
South San Francisco

Why use momondo?

Why should I use momondo to find a flight deal from Islip to San Francisco?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Islip to San Francisco for you.

Can I find flights from Islip to San Francisco with flexible booking policies on momondo?

All flight searches from Islip to San Francisco on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Islip to San Francisco?

Once all potential Islip to San Francisco flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Islip to San Francisco right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Islip to San Francisco flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your San Francisco trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Wed 4/22
Wed 4/29
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States