HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
San Diego

$349+ Cheap flights from Islip, NY to San Diego (ISP - SAN)

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 12/25. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SAN
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Islip to San Diego 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 Diego

Cheapest flights from Islip to San Diego
Explore the most affordable flight options available from Islip to San Diego. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 12, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/10. 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.
Thu 12/2510:38 amISP - SAN
1 stop28h 49mMultiple Airlines
Mon 12/294:47 pmSAN - ISP
2 stops15h 38mMultiple Airlines
Deal found 12/10$845
This Southwest deal was found by Cheapflights users on 12/10. 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 12/2612:40 pmISP - SAN
1 stop12h 40mSouthwest
Sun 12/286:20 amSAN - ISP
1 stop7h 55mSouthwest
Deal found 12/10$867
This Kiwi.com deal was found by Cheapflights users on 12/10. 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.
Thu 12/2510:38 amISP - SAN
1 stop28h 49mBreeze Airways
Mon 12/291:12 pmSAN - ISP
1 stop17h 46mBreeze Airways
Deal found 12/10$981

Find flight deals from Islip to San Diego

Discover tips and strategies to find the most affordable flight options for your journey from Islip (ISP) to San Diego (SAN). 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 December 12, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$845
(Kiwi.com)

One-way from

$349
(Southwest)

Popular in

December

Cheapest in

January

Average price

$709
Provider with most accurate pricing for Islip Long Island-San Diego flight deals.
Search Deals
Provider most trusted by Cheapflights users for Islip Long Island-San Diego flights.
Search Deals
From Islip Long Island to San Diego
Search Deals
One-way flight from Islip Long Island to San Diego
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($66 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($23 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip to San Diego 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 December 12, 2025.
Use the filters below to find and compare flights from Islip to San Diego that are best for you.

Fly from

Islip

Fly to

San Diego

Route

Depart

Return

Price

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Thu 12/25

10:38 am-12:27 pm

1 stop28h 49m

San Diego

Mon 12/29

4:47 pm-11:25 am

2 stops15h 38m

$845

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Fri 12/26

12:40 pm-10:20 pm

1 stop12h 40m

San Diego

Sun 12/28

6:20 am-5:15 pm

1 stop7h 55m

$867

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Thu 12/25

10:38 am-12:27 pm

1 stop28h 49m

San Diego

Mon 12/29

1:12 pm-9:58 am

1 stop17h 46m

$981

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Thu 12/25

5:40 am-1:20 pm

2 stops10h 40m

$349

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Thu 12/25

2:19 pm-11:00 pm

3 stops35h 41m

$433

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Wed 12/24

3:55 pm-9:35 pm

1 stop8h 40m

$449

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Tue 12/23

1:35 pm-8:45 pm

1 stop10h 10m

$449

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Tue 12/23

11:40 am-12:36 pm

3 stops51h 56m

$621

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/10

Compare providers for flights from Islip to San Diego

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 Diego in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust 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 Islip, New York-San Diego flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Islip, New York-San Diego flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Islip, New York-San Diego flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Islip, New York-San Diego 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 Islip, New York-San Diego 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 Diego

Have a flexible travel schedule? Discover the best time to fly to San Diego from Islip 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 Islip to San Diego

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

Currently, November is the cheapest month in which you can book a flight from Islip, New York to San Diego (average of $72). Flying from Islip, New York to San Diego in July is currently the most expensive (average of $168). 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.

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

Find hourly flight availability from Islip to San Diego. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 12, 2025.

A simple way to save on the total cost of your ticket is to fly from Islip, New York to San Diego in the evening. If you’re flexible enough to do this you can expect to save up to 58% on your trip compared to booking a flight at noon.

How much does it cost to fly round-trip from Islip, New York to San Diego?

Reviews of airlines servicing San Diego

Get insights into the airlines that provide service to San Diego. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to San Diego. Reviews last updated December 12, 2025.
Peruse reviews from past customers who have flown with Southwest from Islip to San Diego to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
7.9
Good
4,253 reviews

Entertainment

7.5

Comfort

8.0

Crew

8.6

Overall

7.9

Food

7.0

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
7.9
Good
4,253 reviews
Southwest
7.9
Good
4,253 reviews

Entertainment

7.5

Comfort

8.0

Crew

8.6

Overall

7.9

Food

7.0

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Related info for your journey

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

  • How long is the flight from Islip, New York to San Diego?

    Airlines like Southwest and Breeze Airways fly from Islip, New York to San Diego in about 12h 40m. The time it takes to get you to your destination can typically vary by up to 16h 09m. Airlines will cover a distance of 2475 mi. This flight may include one or multiple stops.

  • What is the cheapest airline to fly from Islip, New York to San Diego round-trip?

    Cheapflights users have booked flights from Islip, New York to San Diego round-trip from $350. Southwest is currently priced 27% below the average price you’ll pay for this route.

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

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

  • How can I find direct flights from Islip to San Diego?

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

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

    Yes. Cheapflights offers flight deals from Islip to San Diego 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 Islip, New York to San Diego?

    Currently, November is the cheapest month in which you can book a flight from Islip, New York to San Diego (average of $72). Flying from Islip, New York to San Diego in July is currently the most expensive (average of $168). 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.

See more FAQs

Traveling to a place near San Diego?

Book flights to San Diego if you plan to visit one of these locations
El Cajon
Chula Vista
Coronado
La Mesa
Poway
Lemon Grove
Julian
National City

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 for Islip to San Diego

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Las Vegas flights
John F Kennedy Intl to Los Angeles flights
Newark to Los Angeles flights
Newark to Las Vegas flights
John F Kennedy Intl to San Francisco flights
LaGuardia to Las Vegas flights
LaGuardia to Los Angeles flights
Newark to San Francisco flights
LaGuardia to San Francisco flights
John F Kennedy Intl to San Diego flights
LaGuardia to Burbank flights
Newark to San Diego flights
John F Kennedy Intl to Ontario flights
Newark to Ontario flights
John F Kennedy Intl to Santa Ana flights
LaGuardia to Santa Ana flights
LaGuardia to San Diego flights
Newark to Santa Ana flights
LaGuardia to Ontario flights
Newark to Palm Springs flights
John F Kennedy Intl to Palm Springs flights
John F Kennedy Intl to San Jose flights
John F Kennedy Intl to Reno flights
John F Kennedy Intl to Burbank flights
LaGuardia to Palm Springs flights
Buffalo to Las Vegas flights
Newark to San Jose flights
Rochester to Las Vegas flights
Newark to Sacramento flights
Newark to Reno flights
Albany to Las Vegas flights
Buffalo to Los Angeles flights
Newark to Burbank flights
LaGuardia to Reno flights
John F Kennedy Intl to Oakland flights
LaGuardia to San Jose flights
White Plains to Las Vegas flights
Syracuse to Las Vegas flights
John F Kennedy Intl to Sacramento flights
Islip to Las Vegas flights
Newark to Oakland flights
John F Kennedy Intl to Long Beach flights
Islip to Los Angeles flights
LaGuardia to Sacramento flights
Syracuse to Los Angeles flights
Rochester to Los Angeles flights
White Plains to Los Angeles flights
Albany to Los Angeles flights
Stewart to Las Vegas flights

Top airline flying from Islip to San Diego

Discover the top airline that operate flights from Islip to San Diego. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$350Average$517FlexibilityNo cancel feeOn-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
Site
©2025 Cheapflights