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Cheap flights from Islip to San Francisco from $149

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 to San Francisco departing on 10/29. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Islip to San Francisco (ISP-SFO)

Cheap round-trip flights

Frontier Logo
11:25 am - 11:02 pmISP-SFO
14h 37m2 stops
Frontier Logo
6:29 am - 10:40 amSFO-ISP
25h 11m2 stops
$320Frontier
Find Deal
Thu, Sep 11 - Mon, Sep 15
JetBlue Logo
1:57 pm - 11:31 pmISP-SFO
12h 34m1 stop
JetBlue Logo
9:45 pm - 11:18 amSFO-ISP
10h 33m1 stop
$400JetBlue
Find Deal
Wed, Nov 19 - Wed, Dec 3
JetBlue Logo
1:57 pm - 11:31 pmISP-SFO
12h 34m1 stop
JetBlue Logo
9:45 pm - 11:18 amSFO-ISP
10h 33m1 stop
$426JetBlue
Find Deal
Wed, Nov 19 - Tue, Dec 2
Frontier Logo
5:05 pm - 8:15 amISP-SFO
18h 10m2 stops
Frontier Logo
11:00 pm - 8:42 pmSFO-ISP
18h 42m2 stops
$447Frontier
Find Deal
Sat, Sep 27 - Mon, Oct 6
Southwest Logo
6:05 am - 1:25 pmISP-SFO
10h 20m1 stop
Southwest Logo
9:05 pm - 12:30 pmSFO-ISP
12h 25m1 stop
$448Southwest
Find Deal
Wed, Sep 17 - Sat, Sep 20
Frontier Logo
11:40 am - 11:02 pmISP-SFO
14h 22m2 stops
Frontier Logo
11:00 pm - 8:42 pmSFO-ISP
18h 42m2 stops
$457Frontier
Find Deal
Thu, Oct 2 - Mon, Oct 6
Frontier Logo
11:35 am - 9:21 pmISP-SFO
36h 46m2 stops
Frontier Logo
11:00 pm - 10:40 amSFO-ISP
32h 40m2 stops
$458Frontier
Find Deal
Wed, Sep 10 - Sun, Sep 14
Southwest Logo
12:35 pm - 9:55 pmISP-SFO
12h 20m2 stops
Southwest Logo
9:05 pm - 12:25 pmSFO-ISP
12h 20m1 stop
$470Southwest
Find Deal
Fri, Oct 3 - Mon, Oct 13
Breeze Airways Logo
8:47 pm - 11:54 amISP-SFO
18h 07m2 stops
Breeze Airways Logo
12:50 pm - 8:07 pmSFO-ISP
28h 17m2 stops
$667Breeze Airways
Find Deal
Fri, Nov 7 - Sun, Nov 9
Breeze Airways Logo
8:47 pm - 11:54 amISP-SFO
18h 07m2 stops
Breeze Airways Logo
12:50 pm - 7:41 pmSFO-ISP
27h 51m2 stops
$686Breeze Airways
Find Deal
Fri, Sep 12 - Tue, Sep 16

Frontier flights from Islip to San Francisco

Our best Frontier deals on Islip to San Francisco flight tickets
Frontier
Sep 11
ISP11:25 amIslip Long Island
14h 37m
2 stops
SFO11:02 pmSan Francisco
Sep 15
SFO6:29 amSan Francisco
25h 11m
2 stops
ISP10:40 amIslip Long Island
$320
Find similar
Frontier
Sep 27
ISP5:05 pmIslip Long Island
18h 10m
2 stops
SFO8:15 amSan Francisco
Oct 6
SFO11:00 pmSan Francisco
18h 42m
2 stops
ISP8:42 pmIslip Long Island
$447
Find similar
Frontier
Oct 2
ISP11:40 amIslip Long Island
14h 22m
2 stops
SFO11:02 pmSan Francisco
Oct 6
SFO11:00 pmSan Francisco
18h 42m
2 stops
ISP8:42 pmIslip Long Island
$457
Find similar

Southwest flights from Islip to San Francisco

Our best Southwest deals on Islip to San Francisco flight tickets
Southwest
Sep 17
ISP6:05 amIslip Long Island
10h 20m
1 stop
SFO1:25 pmSan Francisco
Sep 20
SFO9:05 pmSan Francisco
12h 25m
1 stop
ISP12:30 pmIslip Long Island
$448
Find similar
Southwest
Oct 3
ISP12:35 pmIslip Long Island
12h 20m
2 stops
SFO9:55 pmSan Francisco
Oct 13
SFO9:05 pmSan Francisco
12h 20m
1 stop
ISP12:25 pmIslip Long Island
$470
Find similar
Southwest
Oct 3
ISP5:30 amIslip Long Island
11h 55m
1 stop
SFO2:25 pmSan Francisco
Oct 13
SFO9:05 pmSan Francisco
12h 20m
1 stop
ISP12:25 pmIslip Long Island
$482
Find similar

momondo 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, momondo users made 832,500 searches. Data last updated August 28, 2025.
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

Price

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Thu 9/11

11:25 am-11:02 pm

2 stops14h 37m

San Francisco

Mon 9/15

6:29 am-10:40 am

2 stops25h 11m

$320

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Wed 11/19

1:57 pm-11:31 pm

1 stop12h 34m

San Francisco

Wed 12/3

9:45 pm-11:18 am

1 stop10h 33m

$400

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Wed 11/19

1:57 pm-11:31 pm

1 stop12h 34m

San Francisco

Tue 12/2

9:45 pm-11:18 am

1 stop10h 33m

$426

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Sat 9/27

5:05 pm-8:15 am

2 stops18h 10m

San Francisco

Mon 10/6

11:00 pm-8:42 pm

2 stops18h 42m

$447

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Wed 9/17

6:05 am-1:25 pm

1 stop10h 20m

San Francisco

Sat 9/20

9:05 pm-12:30 pm

1 stop12h 25m

$448

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Thu 10/2

11:40 am-11:02 pm

2 stops14h 22m

San Francisco

Mon 10/6

11:00 pm-8:42 pm

2 stops18h 42m

$457

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Wed 9/10

11:35 am-9:21 pm

2 stops36h 46m

San Francisco

Sun 9/14

11:00 pm-10:40 am

2 stops32h 40m

$458

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Fri 10/3

12:35 pm-9:55 pm

2 stops12h 20m

San Francisco

Mon 10/13

9:05 pm-12:25 pm

1 stop12h 20m

$470

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Fri 11/7

8:47 pm-11:54 am

2 stops18h 07m

San Francisco

Sun 11/9

12:50 pm-8:07 pm

2 stops28h 17m

$667

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

Fri 9/12

8:47 pm-11:54 am

2 stops18h 07m

San Francisco

Tue 9/16

12:50 pm-7:41 pm

2 stops27h 51m

$686

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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How to get the cheapest flight ticket from Islip 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 to San Francisco is on a Thursday when prices can be found for as low as $425. The most expensive day to fly to San Francisco is Sunday, with ticket prices averaging around $594.

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

Our data shows that the cheapest Islip 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 $403. Flights in the afternoon are often more expensive with an average ticket price of $510.

When to book flights from Islip to San Francisco

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

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

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

Direct flights

None
There are no direct flights from Islip to San Francisco. There are no popular flight routes from Islip 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 9h 17m, 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
Calistoga
Hayward
Bodega Bay
Roseville
Santa Clara
Big Sur
Daly City
Fremont
Berkeley
Walnut Creek
Half Moon Bay
South San Francisco
Vallejo
Redwood City
Pacific Grove
Salinas

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.

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