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$214+ 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 11/28. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SAN
ago. 25 — sep. 11
lun. 8/25
lun. 9/1
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 agosto 20, 2025.

Round-trip from

$265
(FlightHub)

One-way from

$214
(Southwest)

Popular in

December

Cheapest in

October

Average price

$392
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. 6% potential increase in price ($26 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($13 potential savings vs. average RT price).
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Average for round-trip flights in August 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 agosto 20, 2025.

This FlightHub deal was found by Cheapflights users on 8/18. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/411:45 amISP - SAN
2 stops25h 45mFrontier
lun. 9/86:49 pmSAN - ISP
2 stops36h 51mFrontier
Deal found 8/18$265
This FlightHub deal was found by Cheapflights users on 8/18. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/45:05 pmISP - SAN
2 stops33h 48mFrontier
jue. 10/97:23 pmSAN - ISP
2 stops36h 52mFrontier
Deal found 8/18$277
This FlightHub deal was found by Cheapflights users on 8/18. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/45:05 pmISP - SAN
2 stops21h 04mFrontier
mié. 10/82:11 pmSAN - ISP
2 stops27h 31mFrontier
Deal found 8/18$288
This FlightHub deal was found by Cheapflights users on 8/18. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/65:05 pmISP - SAN
2 stops26h 37mFrontier
lun. 9/810:20 amSAN - ISP
2 stops21h 20mFrontier
Deal found 8/18$295
This Southwest deal was found by Cheapflights users on 8/19. 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.
vie. 10/35:35 pmISP - SAN
1 stop7h 55mSouthwest
vie. 10/1012:10 pmSAN - ISP
1 stop8h 35mSouthwest
Deal found 8/19$359
This Southwest deal was found by Cheapflights users on 8/20. 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.
mar. 10/74:55 pmISP - SAN
1 stop9h 15mSouthwest
dom. 10/121:25 pmSAN - ISP
1 stop7h 25mSouthwest
Deal found 8/20$372
This Southwest deal was found by Cheapflights users on 8/18. 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.
sáb. 10/43:10 pmISP - SAN
1 stop8h 25mSouthwest
mié. 10/88:50 amSAN - ISP
2 stops10h 15mSouthwest
Deal found 8/18$376
This Expedia deal was found by Cheapflights users on 8/18. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/239:37 pmISP - SAN
2 stops17h 40mFrontier
sáb. 10/252:24 pmSAN - ISP
2 stops15h 35mFrontier
Deal found 8/18$386
This Southwest deal was found by Cheapflights users on 8/17. 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.
jue. 10/165:35 pmISP - SAN
1 stop7h 55mSouthwest
dom. 10/191:25 pmSAN - ISP
1 stop7h 25mSouthwest
Deal found 8/17$449

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 agosto 20, 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

jue. 9/4

11:45 am-10:30 am

2 stops25h 45m

San Diego

lun. 9/8

6:49 pm-10:40 am

2 stops36h 51m

$265

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

jue. 9/11

11:25 am-10:30 am

2 stops26h 05m

San Diego

lun. 9/15

6:49 pm-10:40 am

2 stops36h 51m

$265

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

jue. 10/16

9:37 pm-9:37 am

2 stops39h 00m

San Diego

dom. 10/19

7:23 pm-8:42 pm

2 stops46h 19m

$265

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

sáb. 10/4

5:05 pm-11:53 pm

2 stops33h 48m

San Diego

jue. 10/9

7:23 pm-11:15 am

2 stops36h 52m

$277

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

sáb. 10/4

5:05 pm-11:09 am

2 stops21h 04m

San Diego

mié. 10/8

2:11 pm-8:42 pm

2 stops27h 31m

$288

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

sáb. 9/6

5:05 pm-4:42 pm

2 stops26h 37m

San Diego

lun. 9/8

10:20 am-10:40 am

2 stops21h 20m

$295

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

vie. 10/3

5:35 pm-10:30 pm

1 stop7h 55m

San Diego

vie. 10/10

12:10 pm-11:45 pm

1 stop8h 35m

$359

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

mar. 10/7

4:55 pm-11:10 pm

1 stop9h 15m

San Diego

dom. 10/12

1:25 pm-11:50 pm

1 stop7h 25m

$372

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

sáb. 10/4

3:10 pm-8:35 pm

1 stop8h 25m

San Diego

mié. 10/8

8:50 am-10:05 pm

2 stops10h 15m

$376

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

jue. 10/23

9:37 pm-12:17 pm

2 stops17h 40m

San Diego

sáb. 10/25

2:24 pm-8:59 am

2 stops15h 35m

$386

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/20

Showing 1-10 of 18 results
1
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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, August is the cheapest month in which you can book a flight from Islip to San Diego (average of $286). Flying from Islip to San Diego in March is currently the most expensive (average of $366). 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 agosto 20, 2025.

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

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 agosto 20, 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
4,246 reviews

Overall

8.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Food

7.0

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
4,246 reviews
Southwest
8.0
Very good
4,246 reviews

Overall

8.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Food

7.0

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?

    Frontier can get you from Islip to San Diego in just under 25h 45m. 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, August is the cheapest month in which you can book a flight from Islip to San Diego (average of $286). Flying from Islip to San Diego in March is currently the most expensive (average of $366). 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
La Mesa
Poway
Lemon Grove
Coronado
Imperial Beach
National City
Alpine

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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 agosto 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$350Average$521FlexibilityNo cancel feeOn-time63%

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