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$181+ Cheap flights from Islip 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 10/30. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SAN
Nov 15 — Nov 221
Sat 11/15
Sat 11/22
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 October 16, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$412
(Kiwi.com)

One-way from

$181
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$352
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
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One-way flight from Islip Long Island to San Diego
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Highest demand for flights based on searches. 7% potential increase in price ($31 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($12 potential savings vs. average RT price).
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Average for round-trip flights in October 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 October 16, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/15. 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 10/307:36 pmISP - SAN
1 stop19h 51mMultiple Airlines
Mon 11/36:25 amSAN - ISP
2 stops32h 17mMultiple Airlines
Deal found 10/15$412
This Southwest deal was found by Cheapflights users on 10/14. 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.
Tue 12/25:40 amISP - SAN
2 stops10h 40mSouthwest
Tue 12/912:00 pmSAN - ISP
1 stop7h 05mSouthwest
Deal found 10/14$418
This Kiwi.com deal was found by Cheapflights users on 10/16. 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 10/307:36 pmISP - SAN
1 stop19h 51mMultiple Airlines
Sun 11/25:41 amSAN - ISP
2 stops24h 56mMultiple Airlines
Deal found 10/16$447
This Southwest deal was found by Cheapflights users on 10/16. 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.
Sat 11/153:40 pmISP - SAN
1 stop9h 35mSouthwest
Sat 11/2211:35 amSAN - ISP
2 stops9h 20mSouthwest
Deal found 10/16$454
This Southwest deal was found by Cheapflights users on 10/16. 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.
Sun 11/165:50 amISP - SAN
1 stop9h 30mSouthwest
Wed 11/196:50 amSAN - ISP
1 stop12h 15mSouthwest
Deal found 10/16$488
This Southwest deal was found by Cheapflights users on 10/16. 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.
Mon 11/173:55 pmISP - SAN
1 stop8h 40mSouthwest
Thu 11/209:00 amSAN - ISP
2 stops10h 05mSouthwest
Deal found 10/16$533
This Kiwi.com deal was found by Cheapflights users on 10/16. 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 10/307:36 pmISP - SAN
1 stop19h 51mBreeze Airways
Sun 11/21:21 pmSAN - ISP
1 stop21h 24mBreeze Airways
Deal found 10/16$577

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 October 16, 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 10/30

7:36 pm-12:27 pm

1 stop19h 51m

San Diego

Mon 11/3

6:25 am-5:42 pm

2 stops32h 17m

$412

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Tue 12/2

6:15 am-6:55 pm

1 stop15h 40m

San Diego

Tue 12/9

12:00 pm-10:05 pm

1 stop7h 05m

$418

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Thu 10/30

7:36 pm-12:27 pm

1 stop19h 51m

San Diego

Sun 11/2

5:41 am-9:37 am

2 stops24h 56m

$447

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Sat 11/15

3:40 pm-10:15 pm

1 stop9h 35m

San Diego

Sat 11/22

11:35 am-11:55 pm

2 stops9h 20m

$454

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Sun 11/16

5:50 am-12:20 pm

1 stop9h 30m

San Diego

Wed 11/19

6:50 am-10:05 pm

1 stop12h 15m

$488

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Mon 11/17

3:55 pm-9:35 pm

1 stop8h 40m

San Diego

Thu 11/20

9:00 am-10:05 pm

2 stops10h 05m

$533

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Thu 10/30

7:36 pm-12:27 pm

1 stop19h 51m

San Diego

Sun 11/2

1:21 pm-1:45 pm

1 stop21h 24m

$577

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Thu 10/30

6:37 pm-11:48 pm

2 stops32h 11m

$188

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Thu 10/30

7:36 pm-12:27 pm

1 stop19h 51m

$232

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Sun 11/30

8:25 pm-8:07 pm

2 stops50h 42m

$365

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/16

Showing 1-10 of 12 results
1
2

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

Currently, March is the cheapest month in which you can book a flight from Islip to San Diego (average of $97). Flying from Islip to San Diego in December is currently the most expensive (average of $200). 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 October 16, 2025.

A simple way to save on the total cost of your ticket is to fly from Islip 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 October 16, 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
4,241 reviews

Overall

8.0

Comfort

8.0

Food

7.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

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
4,241 reviews
Southwest
8.0
Very good
4,241 reviews

Overall

8.0

Comfort

8.0

Food

7.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

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 to San Diego?

    Southwest can get you from Islip to San Diego in just under 15h 40m. Your travel time can differ by up to . There are 2475 mi between Islip and San Diego.

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

    Our cheapest airline available from Islip to San Diego is Southwest. Our recent data shows that you can find tickets from as low as $350 on this airline.

  • 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 to San Diego?

    Currently, March is the cheapest month in which you can book a flight from Islip to San Diego (average of $97). Flying from Islip to San Diego in December is currently the most expensive (average of $200). 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
Imperial Beach
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 October 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$350Average$521FlexibilityNo cancel feeOn-time63%

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