Latest deals
Insights
When to book
FAQs
Price Alerts

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 11/17. 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
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 to San Francisco

Cheap round-trip flights

Frontier Logo
9:27 pm - 12:15 pmISP-SFO
17h 48m2 stops
Frontier Logo
1:10 pm - 10:37 amSFO-ISP
18h 27m2 stops
$278Frontier
Find Deal
dom., nov. 9 - jue., nov. 13
JetBlue Logo
1:57 pm - 11:31 pmISP-SFO
12h 34m1 stop
JetBlue Logo
9:44 pm - 1:02 pmSFO-ISP
12h 18m1 stop
$352JetBlue
Find Deal
lun., oct. 27 - vie., oct. 31
Frontier Logo
9:49 am - 12:16 amISP-SFO
17h 27m2 stops
Frontier Logo
11:57 pm - 4:27 pmSFO-ISP
13h 30m2 stops
$376Frontier
Find Deal
dom., sep. 28 - jue., oct. 2
JetBlue Logo
4:24 pm - 11:30 pmISP-SFO
10h 06m1 stop
JetBlue Logo
11:00 pm - 11:18 amSFO-ISP
9h 18m1 stop
$397JetBlue
Find Deal
lun., nov. 24 - lun., dic. 1
JetBlue Logo
1:57 pm - 11:31 pmISP-SFO
12h 34m1 stop
JetBlue Logo
11:00 pm - 11:18 amSFO-ISP
9h 18m1 stop
$407JetBlue
Find Deal
sáb., nov. 15 - lun., dic. 1
Frontier Logo
9:49 am - 12:16 amISP-SFO
17h 27m2 stops
Frontier Logo
7:07 pm - 10:40 amSFO-ISP
12h 33m2 stops
$420Frontier
Find Deal
dom., sep. 28 - dom., oct. 5
Southwest Logo
5:25 am - 3:00 pmISP-SFO
12h 35m2 stops
Southwest Logo
7:10 am - 11:50 pmSFO-ISP
13h 40m2 stops
$588Southwest
Find Deal
dom., oct. 12 - dom., oct. 19
Southwest Logo
5:25 am - 3:00 pmISP-SFO
12h 35m2 stops
Southwest Logo
9:05 pm - 11:50 amSFO-ISP
11h 45m1 stop
$628Southwest
Find Deal
dom., oct. 12 - dom., oct. 19
Breeze Airways Logo
8:47 pm - 12:05 pmISP-SFO
18h 18m2 stops
Breeze Airways Logo
12:39 pm - 1:39 pmSFO-ISP
22h 00m1 stop
$657Breeze Airways
Find Deal
lun., oct. 20 - mié., oct. 22
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
$667Breeze Airways
Find Deal
vie., oct. 3 - mar., oct. 7

Frontier flights from Islip to San Francisco

Our best Frontier deals on Islip to San Francisco flight tickets
Frontier
Nov 9
ISP9:27 pmIslip Long Island
17h 48m
2 stops
SFO12:15 pmSan Francisco
Nov 13
SFO1:10 pmSan Francisco
18h 27m
2 stops
ISP10:37 amIslip Long Island
$278
Find similar
Frontier
Sep 28
ISP9:49 amIslip Long Island
17h 27m
2 stops
SFO12:16 amSan Francisco
Oct 2
SFO11:57 pmSan Francisco
13h 30m
2 stops
ISP4:27 pmIslip Long Island
$376
Find similar
Frontier
Sep 28
ISP9:49 amIslip Long Island
17h 27m
2 stops
SFO12:16 amSan Francisco
Oct 5
SFO7:07 pmSan Francisco
12h 33m
2 stops
ISP10:40 amIslip Long Island
$420
Find similar

Southwest flights from Islip to San Francisco

Our best Southwest deals on Islip to San Francisco flight tickets
Southwest
Oct 12
ISP5:25 amIslip Long Island
12h 35m
2 stops
SFO3:00 pmSan Francisco
Oct 19
SFO7:10 amSan Francisco
13h 40m
2 stops
ISP11:50 pmIslip Long Island
$588
Find similar
Southwest
Oct 12
ISP5:25 amIslip Long Island
12h 35m
2 stops
SFO3:00 pmSan Francisco
Oct 19
SFO9:05 pmSan Francisco
11h 45m
1 stop
ISP11:50 amIslip Long Island
$628
Find similar
Southwest
Nov 23
ISP5:50 amIslip Long Island
12h 15m
2 stops
SFO3:05 pmSan Francisco
Nov 30
SFO7:25 pmSan Francisco
13h 30m
2 stops
ISP11:55 amIslip Long Island
$729
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 septiembre 15, 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

dom. 11/9

9:27 pm-12:15 pm

2 stops17h 48m

San Francisco

jue. 11/13

1:10 pm-10:37 am

2 stops18h 27m

$278

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

lun. 10/27

1:57 pm-11:31 pm

1 stop12h 34m

San Francisco

vie. 10/31

9:44 pm-1:02 pm

1 stop12h 18m

$352

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

dom. 9/28

9:49 am-12:16 am

2 stops17h 27m

San Francisco

jue. 10/2

11:57 pm-4:27 pm

2 stops13h 30m

$376

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

lun. 11/24

4:24 pm-11:30 pm

1 stop10h 06m

San Francisco

lun. 12/1

11:00 pm-11:18 am

1 stop9h 18m

$397

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

sáb. 11/15

1:57 pm-11:31 pm

1 stop12h 34m

San Francisco

lun. 12/1

11:00 pm-11:18 am

1 stop9h 18m

$407

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

dom. 9/28

9:49 am-12:16 am

2 stops17h 27m

San Francisco

dom. 10/5

7:07 pm-10:40 am

2 stops12h 33m

$420

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

dom. 10/12

5:25 am-3:00 pm

2 stops12h 35m

San Francisco

dom. 10/19

7:10 am-11:50 pm

2 stops13h 40m

$588

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

dom. 10/12

5:25 am-3:00 pm

2 stops12h 35m

San Francisco

dom. 10/19

9:05 pm-11:50 am

1 stop11h 45m

$628

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

lun. 10/20

8:47 pm-12:05 pm

2 stops18h 18m

San Francisco

mié. 10/22

12:39 pm-1:39 pm

1 stop22h 00m

$657

IslipSan Francisco

ISP - SFO

ISPSFO

Islip Long Island

vie. 10/3

8:47 pm-11:54 am

2 stops18h 07m

San Francisco

mar. 10/7

12:50 pm-7:41 pm

2 stops27h 51m

$667

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 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 $424. 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 $404. Flights in the afternoon are often more expensive with an average ticket price of $509.

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 10h 06m, 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
Bodega Bay
Roseville
Hayward
Big Sur
Santa Clara
Daly City
Fremont
Berkeley
Half Moon Bay
Walnut Creek
Vallejo
Redwood City
Salinas
South San Francisco
Fairfield

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
mié. 10/15
mié. 10/22
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States