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$194+ 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 9/14. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SAN
Jul 16 — Jul 231
Wed 7/16
Wed 7/23
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 July 11, 2025.

Round-trip from

$224
(Southwest)

One-way from

$194
(Southwest)

Popular in

December

Cheapest in

October

Average price

$402
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 ($25 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 July 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 July 11, 2025.

This Southwest deal was found by Cheapflights users on 7/8. 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.
Wed 10/154:55 pmISP - SAN
1 stop9h 15mSouthwest
Sat 10/189:10 pmSAN - ISP
1 stop12h 00mSouthwest
Deal found 7/8$224
This Frontier deal was found by Cheapflights users on 7/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/58:00 amISP - SAN
2 stops18h 02mFrontier
Tue 8/127:04 pmSAN - ISP
2 stops17h 38mFrontier
Deal found 7/10$452
This Mytrip deal was found by Cheapflights users on 7/10. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/253:59 pmISP - SAN
3 stops28h 56mMultiple Airlines
Tue 7/293:57 pmSAN - ISP
3 stops18h 35mMultiple Airlines
Deal found 7/10$774
This KAYAK deal was found by Cheapflights users on 7/10. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/177:39 pmISP - SAN
1 stop19h 34mBreeze Airways
Mon 7/2112:58 pmSAN - ISP
1 stop21h 17mBreeze Airways
Deal found 7/10$852

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 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

Wed 10/15

4:55 pm-11:10 pm

1 stop9h 15m

San Diego

Sat 10/18

9:10 pm-12:10 pm

1 stop12h 00m

$224

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Tue 8/5

8:00 am-11:02 pm

2 stops18h 02m

San Diego

Wed 8/13

7:04 pm-1:04 pm

2 stops15h 00m

$452

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Fri 7/25

3:59 pm-5:55 pm

3 stops28h 56m

San Diego

Tue 7/29

3:57 pm-1:32 pm

3 stops18h 35m

$774

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Wed 7/23

2:55 pm-12:03 pm

1 stop24h 08m

San Diego

Sun 7/27

12:48 pm-3:19 pm

1 stop23h 31m

$928

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Sun 9/14

6:00 am-11:20 am

1 stop8h 20m

$194

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Thu 8/7

2:05 pm-11:57 pm

2 stops12h 52m

$209

IslipSan Diego

ISP - SAN

ISPSAN

Islip Long Island

Sun 9/14

7:36 pm-11:45 pm

3 stops31h 09m

$393

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/10

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, August is the cheapest month in which you can book a flight from Islip, New York to San Diego (average of $286). Flying from Islip, New York 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 July 11, 2025.

A simple way to save on the total cost of your ticket is to fly from Islip, New York 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 July 11, 2025.
Peruse reviews from past customers who have flown with Southwest, Breeze Airways, and Frontier 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
4,249 reviews

Crew

8.6

Boarding

8.1

Overall

8.0

Food

7.0

Comfort

8.0

Entertainment

7.6

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Southwest
8.0
Very good
4,249 reviews
Southwest
8.0
Very good
4,249 reviews

Crew

8.6

Boarding

8.1

Overall

8.0

Food

7.0

Comfort

8.0

Entertainment

7.6

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Breeze Airways
8.0
Very good
187 reviews
Southwest
8.0
Very good
4,249 reviews

Crew

8.6

Boarding

8.1

Overall

8.0

Food

7.0

Comfort

8.0

Entertainment

7.6

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Frontier
5.9
Fair
3,271 reviews
Southwest
8.0
Very good
4,249 reviews

Crew

8.6

Boarding

8.1

Overall

8.0

Food

7.0

Comfort

8.0

Entertainment

7.6

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

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.

  • What are the cheapest airlines flying from Islip, New York to San Diego round-trip?

    Cheapflights users have booked flights from Islip, New York to San Diego round-trip from $224. Other airlines that can offer you cheap pricing are Frontier, from $452, and Breeze Airways, from $928.

  • 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, August is the cheapest month in which you can book a flight from Islip, New York to San Diego (average of $286). Flying from Islip, New York 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 Islip?

Book flights to Islip if you plan to visit one of these locations
El Cajon
Chula Vista
Coronado
National City
Lemon Grove
Imperial Beach
La Mesa
Poway
Alpine
Santee

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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 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$350Average$551FlexibilityNo cancel feeOn-time63%

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