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$311+ 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 10/3. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SAN
Aug 21 — Aug 281
Fri 8/21
Fri 8/28
1 adult, Economy
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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 July 22, 2026.

This Southwest deal was found by Cheapflights users on 7/22. 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 10/33:50 pm
ISP
-
SAN
1 stop8h 05m
Southwest
Sat 10/176:15 am
SAN
-
ISP
1 stop6h 55m
Southwest
Deal found 7/22$311
This Southwest deal was found by Cheapflights users on 7/17. 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.
Thu 8/276:10 am
ISP
-
SAN
1 stop8h 50m
Southwest
Tue 9/110:40 pm
SAN
-
ISP
1 stop8h 35m
Southwest
Deal found 7/17$337
This Southwest deal was found by Cheapflights users on 7/20. 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.
Thu 11/194:00 pm
ISP
-
SAN
1 stop7h 55m
Southwest
Tue 11/249:15 am
SAN
-
ISP
1 stop11h 15m
Southwest
Deal found 7/20$392
This Southwest deal was found by Cheapflights users on 7/21. 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 9/2812:35 pm
ISP
-
SAN
1 stop13h 10m
Southwest
Sun 10/46:35 am
SAN
-
ISP
1 stop8h 00m
Southwest
Deal found 7/21$394
This Southwest deal was found by Cheapflights users on 7/18. 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.
Thu 8/274:05 pm
ISP
-
SAN
1 stop9h 40m
Southwest
Sun 8/3010:40 pm
SAN
-
ISP
1 stop8h 00m
Southwest
Deal found 7/18$402

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 July 22, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$311
(Southwest)

Popular in

December

Cheapest in

September

Average price

$425
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
Highest demand for flights based on searches. 4% potential increase in price ($18 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
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 July 22, 2026.
Use the filters below to find and compare flights from Islip to San Diego that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Sat 10/3

3:50 pm-8:55 pm

1 stop8h 05m

San Diego

Sat 10/17

6:15 am-4:10 pm

1 stop6h 55m

$311

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Mon 9/28

12:35 pm-10:45 pm

1 stop13h 10m

San Diego

Sun 10/4

6:35 am-5:35 pm

1 stop8h 00m

$394

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Thu 8/27

4:05 pm-10:45 pm

1 stop9h 40m

San Diego

Sun 8/30

10:40 pm-9:40 am

1 stop8h 00m

$402

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Wed 9/16

12:55 pm-7:35 pm

1 stop9h 40m

San Diego

Fri 9/18

11:45 am-10:05 pm

1 stop7h 20m

$402
Quickest round-trip

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Sun 1/10

3:50 pm-8:45 pm

1 stop7h 55m

San Diego

Wed 1/13

11:35 am-9:30 pm

1 stop6h 55m

$402
Cheapest one-way

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Mon 10/5

3:02 pm-12:37 pm

1 stop24h 35m

$340

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Sat 8/15

11:57 am-11:24 am

1 stop26h 27m

$370
Quickest one-way

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Sun 8/16

7:49 pm-12:20 pm

1 stop19h 31m

$420

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Sat 8/8

11:57 am-11:24 am

1 stop26h 27m

$430

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Tue 7/28

11:56 am-12:33 pm

1 stop27h 37m

$590

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/22

Showing 1-10 of 12 resultsSorted by cheapest first
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 July.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice 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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Islip, New York-San Diego flight deals on Cheapflights vs. FlightHub >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 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, 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.

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 July 22, 2026.
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
4,240 reviews

Comfort

8.0

Overall

8.0

Entertainment

7.5

Boarding

8.1

Crew

8.6

Food

7.0

Reviews

1 / 20
10.0
Excellent

Walter,May 2026

LAS - BUR

Short but excellent flight. Everyone was friendly and professional it was a great flight!
Southwest
8.0
Very good
4,240 reviews
Southwest
8.0
Very good
4,240 reviews

Comfort

8.0

Overall

8.0

Entertainment

7.5

Boarding

8.1

Crew

8.6

Food

7.0

Reviews

1 / 20
10.0
Excellent

Walter,May 2026

LAS - BUR

Short but excellent flight. Everyone was friendly and professional it was a great flight!

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 fly from Islip, New York to San Diego in about 8h 05m. The time it takes to get you to your destination can typically vary by up to . Airlines will cover a distance of 2475 mi.

  • 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 $376.

  • 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.

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
National City
Chula Vista
Poway
La Mesa
Coronado
Santee
San Ysidro
Julian
Lemon Grove

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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 July 22, 2026.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$376Average$558FlexibilityNo cancel feeOn-time63%

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