In terms of precipitation, rainfall in Islip, New York ranges from 3.3 - 4.4 inches per month. March is typically the wettest month, when rainfall can reach 4.4 in. February is typically the driest time to visit Islip, New York when rainfall is around 3.3 in.

If weather is an important factor for your trip to Islip, New York, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).

How far in advance should I book a flight from Des Moines to Islip, New York?

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 40 days in advance, which can save you up to 86% on flights from Des Moines to Islip, New York compared to booking the week you need them. Waiting 40 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $310. For sooner than that we have options available in the next 3 days from $388.

What is the cheapest month to fly from Des Moines to Islip, New York?

Our data shows that September tends to be the cheapest month to fly to Islip, New York from Des Moines. Users have commonly found prices around $315 for the month, but tickets can be as low as $99. Due to multiple factors, prepare for potentially higher prices in December.

What is the cheapest time of day to fly from DSM to ISP?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Des Moines to Islip, New York as you normally would.

Can I find deals for flights from Des Moines to Islip that include hotel bookings?

Yes. In addition to deals on Des Moines to Islip flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Des Moines to Islip?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Des Moines to Islip.

Can I find deals for business class flights from Des Moines to Islip?

Yes. Cheapflights offers flight deals from Des Moines to Islip by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$614+ Flights from Des Moines to Islip, NY

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Cheap flight deals from Des Moines to Islip

Round-trip from	$614 (Southwest)
Popular in	December
Cheapest in	September
Average price	$327

From Des Moines to Islip Long Island

Search Deals

Highest demand for flights based on searches. 6% potential increase in price ($20 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in July 2025

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Find flight deals from Des Moines to Islip

Cheapest flights from Des Moines to Islip
Explore the most affordable flight options available from Des Moines to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.

Thu 10/95:35 amDSM - ISP

2 stops10h 15mSouthwest

Sun 10/1212:55 pmISP - DSM

2 stops11h 50mSouthwest

Deal found 7/28

$614

Thu 10/910:51 amDSM - ISP

3 stops25h 54mMultiple Airlines

Sun 10/122:19 pmISP - DSM

2 stops21h 16mMultiple Airlines

Deal found 7/28

$840

Best flights from Des Moines to Islip
Discover carefully curated flight deals from Des Moines to Islip that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 29, 2025.

Thu 10/95:35 amDSM - ISP

2 stops10h 15mSouthwest

Sun 10/1212:55 pmISP - DSM

2 stops11h 50mSouthwest

Deal found 7/28

$614

Thu 10/910:51 amDSM - ISP

3 stops25h 54mMultiple Airlines

Sun 10/122:19 pmISP - DSM

2 stops21h 16mMultiple Airlines

Deal found 7/28

$840

Fly from

Fly to

Route

Depart

Return

Price

Des MoinesIslip

DSM - ISP

DSMISP

Des Moines

Thu 10/9

5:35 am-4:50 pm

2 stops10h 15m

Islip Long Island

Sun 10/12

12:55 pm-11:45 pm

2 stops11h 50m

$614

Des MoinesIslip

DSM - ISP

DSMISP

Des Moines

Thu 10/9

10:51 am-1:45 pm

3 stops25h 54m

Islip Long Island

Sun 10/12

2:19 pm-10:35 am

2 stops21h 16m

$840

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Best time to book a flight from Des Moines to Islip

Have a flexible travel schedule? Discover the best time to fly to Islip from Des Moines 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 Des Moines to Islip

What is the cheapest month to book a flight from Des Moines to Islip, New York?

Currently, January is the cheapest month in which you can book a flight from Des Moines to Islip, New York (average of $108). Flying from Des Moines to Islip, New York in November is currently the most expensive (average of $213). 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.

Reviews of airlines servicing Islip

Read through reviews of airlines operating flights from Des Moines to Islip, such as Southwest. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Southwest

8.0

Very good

4,238 reviews

Reviews

1 / 20

8.0

Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

Southwest

8.0

Very good

4,238 reviews

Southwest

8.0

Very good

4,238 reviews

Reviews

1 / 20

8.0

Excellent

Gina,Jul 2025

LAS - DEN

Related info for your journey

Can I find deals for flights from Des Moines to Islip that include hotel bookings?
Yes. In addition to deals on Des Moines to Islip flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Des Moines to Islip?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Des Moines to Islip.
Can I find deals for business class flights from Des Moines to Islip?
Yes. Cheapflights offers flight deals from Des Moines to Islip 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 Des Moines to Islip, New York?
Currently, January is the cheapest month in which you can book a flight from Des Moines to Islip, New York (average of $108). Flying from Des Moines to Islip, New York in November is currently the most expensive (average of $213). 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.

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Complete your trip

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$614+ Cheap flights from Des Moines to Islip, NY (DSM - ISP)

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 10/9. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Des Moines to Islip with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Des Moines to Islip

Round-trip from

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Find flight deals from Des Moines to Islip

Cheapest flights from Des Moines to IslipExplore the most affordable flight options available from Des Moines to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.

Explore the most affordable flight options available from Des Moines to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Des Moines to Islip that are best for you.

Best time to book a flight from Des Moines to Islip

Have a flexible travel schedule? Discover the best time to fly to Islip from Des Moines with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Des Moines to Islip

What is the cheapest month to book a flight from Des Moines to Islip, New York?

Reviews of airlines servicing Islip

Get insights into the airlines that provide service to Islip. 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 Islip. Reviews last updated July 29, 2025.

Read through reviews of airlines operating flights from Des Moines to Islip, such as Southwest. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Des Moines to Islip. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

Can I find deals for flights from Des Moines to Islip that include hotel bookings?

How can I find direct flights from Des Moines to Islip?

Can I find deals for business class flights from Des Moines to Islip?

What is the cheapest month to book a flight from Des Moines to Islip, New York?

Traveling to a place near Islip?

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Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Des Moines to Islip

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Book with Flexibility

Travel Smart

Cheapest flights from Des Moines to Islip
Explore the most affordable flight options available from Des Moines to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.