In terms of precipitation, rainfall in Islip, New York ranges from 3.3 - 4.4 inches per month. March is typically the wettest month, when rainfall can reach 4.4 in. February is typically the driest time to visit Islip, New York when rainfall is around 3.3 in.

If weather is an important factor for your trip to Islip, New York, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).

What is the cheapest time of day to fly from SJC to ISP?

When flying from San Jose, California to Islip, New York, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Most accurate provider : When it comes to deals on San Jose, California-Islip, New York flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on San Jose, California-Islip, New York flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from San Jose, California-Islip, New York flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on San Jose, California-Islip, New York flights, Cheapflights users trust eDreams the most. eDreams 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 Jose, California-Islip, New York flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Can I find deals for flights from San Jose to Islip that include hotel bookings?

Yes. In addition to deals on San Jose to Islip flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from San Jose to Islip?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Jose to Islip.

Can I find deals for business class flights from San Jose to Islip?

Yes. Cheapflights offers flight deals from San Jose to Islip by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$1,990+ Flights from San Jose, CA to Islip, NY

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Cheap flight deals from San Jose to Islip

Cheapest flights from San Jose to Islip
Explore the most affordable flight options available from San Jose to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 14, 2025.

Sat 12/272:47 pmSJC - ISP

2 stops17h 18mMultiple Airlines

Tue 12/3012:30 pmISP - SJC

2 stops13h 09mMultiple Airlines

Deal found 12/13

$1,990

Sun 12/2812:02 pmSJC - ISP

2 stops20h 03mMultiple Airlines

Thu 1/112:30 pmISP - SJC

3 stops23h 28mMultiple Airlines

Deal found 12/13

$2,278

Best flights from San Jose to Islip
Discover carefully curated flight deals from San Jose to Islip that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 14, 2025.

Sat 12/272:47 pmSJC - ISP

2 stops17h 18mMultiple Airlines

Tue 12/3012:30 pmISP - SJC

2 stops13h 09mMultiple Airlines

Deal found 12/13

$1,990

Sun 12/2812:02 pmSJC - ISP

2 stops20h 03mMultiple Airlines

Thu 1/112:30 pmISP - SJC

3 stops23h 28mMultiple Airlines

Deal found 12/13

$2,278

Last-minute flights from San Jose to Islip
Discover last-minute flight deals from San Jose to Islip. Data last updated December 14, 2025 and is based on user searches.

Sat 12/272:47 pmSJC - ISP

2 stops17h 18mMultiple Airlines

Tue 12/3012:30 pmISP - SJC

2 stops13h 09mMultiple Airlines

Deal found 12/13

$1,990

Sun 12/2812:02 pmSJC - ISP

2 stops20h 03mMultiple Airlines

Thu 1/112:30 pmISP - SJC

3 stops23h 28mMultiple Airlines

Deal found 12/13

$2,278

Find flight deals from San Jose to Islip

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$1,990 (Expedia)
Popular in	November
Cheapest in	February
Average price	$474

Provider with most accurate pricing for San Jose-Islip Long Island flight deals.

Search Deals

Provider most trusted by Cheapflights users for San Jose-Islip Long Island flights.

Search Deals

From San Jose to Islip Long Island

Search Deals

Highest demand for flights based on searches. 16% potential increase in price ($69 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease ($13 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

San JoseIslip

SJC - ISP

SJCISP

San Jose

Sat 12/27

2:47 pm-11:05 am

2 stops17h 18m

Islip Long Island

Tue 12/30

12:30 pm-10:39 pm

2 stops13h 09m

$1,990

San JoseIslip

SJC - ISP

SJCISP

San Jose

Sun 12/28

12:02 pm-11:05 am

2 stops20h 03m

Islip Long Island

Thu 1/1

12:30 pm-8:58 am

3 stops23h 28m

$2,278

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/13

Compare providers for flights from San Jose to Islip

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from San Jose to Islip in December.

Provider	Price Accuracy	Trust Score*
FlightHub	Price Accuracy3 stars	Trust Score*1 star
eDreams	Price Accuracy3 stars	Trust Score*3 stars
Expedia	Price Accuracy2 stars	Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on San Jose, California-Islip, New York flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on San Jose, California-Islip, New York flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from San Jose, California-Islip, New York flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on San Jose, California-Islip, New York flights, Cheapflights users trust eDreams the most. eDreams 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 Jose, California-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 Jose to Islip

Have a flexible travel schedule? Discover the best time to fly to Islip from San Jose with our price prediction graph.

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.

Cheapflights Insights

Everything you need to know about your flight from San Jose to Islip

What is the cheapest month to book a flight from San Jose, California to Islip, New York?

Currently, January is the cheapest month in which you can book a flight from San Jose, California to Islip, New York (average of $64). Flying from San Jose, California to Islip, New York in December is currently the most expensive (average of $207). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Related info for your journey

Can I find deals for flights from San Jose to Islip that include hotel bookings?
Yes. In addition to deals on San Jose to Islip flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from San Jose to Islip?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Jose to Islip.
Can I find deals for business class flights from San Jose to Islip?
Yes. Cheapflights offers flight deals from San Jose to Islip by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from San Jose, California to Islip, New York?
Currently, January is the cheapest month in which you can book a flight from San Jose, California to Islip, New York (average of $64). Flying from San Jose, California to Islip, New York in December is currently the most expensive (average of $207). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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$1,990+ Cheap flights from San Jose, CA to Islip, NY (SJC - ISP)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/27. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from San Jose to Islip with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from San Jose to Islip

Cheapest flights from San Jose to IslipExplore the most affordable flight options available from San Jose to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 14, 2025.

Explore the most affordable flight options available from San Jose to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 14, 2025.

Find flight deals from San Jose to Islip

Most accurate provider

Most trusted provider

Round-trip from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

Use the filters below to find and compare flights from San Jose to Islip that are best for you.

Compare providers for flights from San Jose 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 Jose to Islip in December.

Best time to book a flight from San Jose to Islip

Have a flexible travel schedule? Discover the best time to fly to Islip from San Jose with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from San Jose to Islip

What is the cheapest month to book a flight from San Jose, California to Islip, New York?

Related info for your journey

Find useful and relevant information for your journey from San Jose to Islip. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

Can I find deals for flights from San Jose to Islip that include hotel bookings?

How can I find direct flights from San Jose to Islip?

Can I find deals for business class flights from San Jose to Islip?

What is the cheapest month to book a flight from San Jose, California to Islip, New York?

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Cheapest flights from San Jose to Islip
Explore the most affordable flight options available from San Jose to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 14, 2025.