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$420+ Cheap flights from Islip, NY to San Diego (ISP - SAN)

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 1/25. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SAN
Dec 11 — Dec 181
Thu 12/11
Thu 12/18
1 adult, Economy
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Cheap 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 November 11, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$420
(Southwest)

Popular in

December

Cheapest in

September

Average price

$432
Provider with most accurate pricing for Islip Long Island-San Diego flight deals.
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Provider most trusted by Cheapflights users for Islip Long Island-San Diego flights.
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From Islip Long Island to San Diego
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($45 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($14 potential savings vs. average RT price).
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Average for round-trip flights in November 2025
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Find 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 November 11, 2025.

This Trip.com deal was found by Cheapflights users on 11/9. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/249:02 amISP - SAN
2 stops17h 57mFrontier
Fri 11/286:36 amSAN - ISP
2 stops14h 23mFrontier
Deal found 11/9$473
This Southwest deal was found by Cheapflights users on 11/9. 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 12/53:55 pmISP - SAN
1 stop8h 40mSouthwest
Sun 12/76:40 amSAN - ISP
1 stop7h 15mSouthwest
Deal found 11/9$519
This Kiwi.com deal was found by Cheapflights users on 11/9. 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.
Mon 11/242:25 pmISP - SAN
1 stop25h 11mMultiple Airlines
Fri 11/286:35 amSAN - ISP
2 stops22h 27mMultiple Airlines
Deal found 11/9$853
This Kiwi.com deal was found by Cheapflights users on 11/11. 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.
Wed 11/2611:03 amISP - SAN
2 stops28h 33mMultiple Airlines
Sun 11/301:21 pmSAN - ISP
1 stop21h 24mMultiple Airlines
Deal found 11/11$1,091
This FlightHub deal was found by Cheapflights users on 11/10. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/257:36 pmISP - SAN
1 stop19h 51mBreeze Airways
Sat 11/291:12 pmSAN - ISP
1 stop26h 44mBreeze Airways
Deal found 11/10$1,163
This United deal was found by Cheapflights users on 11/9. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/512:40 pmISP - SAN
3 stops24h 41mMultiple Airlines
Sun 12/712:50 pmSAN - ISP
2 stops24h 20mMultiple Airlines
Deal found 11/9$1,202
This Gotogate deal was found by Cheapflights users on 11/11. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/268:45 pmISP - SAN
2 stops42h 42mBreeze Airways
Sun 11/301:21 pmSAN - ISP
2 stops42h 07mBreeze Airways
Deal found 11/11$1,516
This Gotogate deal was found by Cheapflights users on 11/9. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/247:08 pmISP - SAN
2 stops44h 19mBreeze Airways
Fri 11/281:12 pmSAN - ISP
3 stops27h 53mBreeze Airways
Deal found 11/9$1,680

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 November 11, 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

Sun 1/25

12:35 pm-7:45 pm

1 stop10h 10m

San Diego

Thu 1/29

12:00 pm-9:55 pm

1 stop6h 55m

$420

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Mon 11/24

9:02 am-11:59 pm

2 stops17h 57m

San Diego

Fri 11/28

6:36 am-11:59 pm

2 stops14h 23m

$473

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Fri 12/5

3:55 pm-9:35 pm

1 stop8h 40m

San Diego

Sun 12/7

6:40 am-4:55 pm

1 stop7h 15m

$519

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Sun 1/25

12:30 pm-10:37 pm

2 stops13h 07m

San Diego

Thu 1/29

8:37 pm-4:10 pm

3 stops16h 33m

$955

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Wed 11/26

11:03 am-12:36 pm

2 stops28h 33m

San Diego

Sun 11/30

1:21 pm-1:45 pm

1 stop21h 24m

$1,091

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Tue 11/25

7:36 pm-12:27 pm

1 stop19h 51m

San Diego

Sat 11/29

1:12 pm-6:56 pm

1 stop26h 44m

$1,163

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Fri 12/5

12:40 pm-10:21 am

3 stops24h 41m

San Diego

Sun 12/7

12:50 pm-4:10 pm

2 stops24h 20m

$1,202

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/10

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 November.
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 $81). 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 November 11, 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.

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 November 11, 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
8.0
Very good
4,235 reviews

Entertainment

7.5

Comfort

8.0

Food

7.0

Overall

8.0

Boarding

8.1

Crew

8.6

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
8.0
Very good
4,235 reviews
Southwest
8.0
Very good
4,235 reviews

Entertainment

7.5

Comfort

8.0

Food

7.0

Overall

8.0

Boarding

8.1

Crew

8.6

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 Frontier fly from Islip, New York to San Diego in about 10h 10m. The time it takes to get you to your destination can typically vary by up to 7h 47m. 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.

  • 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 $81). 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
National City

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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 November 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$350Average$521FlexibilityNo cancel feeOn-time63%

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