What are the cheapest airlines flying from Washington, D.C. to Islip, New York round-trip?

Currently priced at $180, Frontier will fly you from Washington, D.C. to Islip, New York and back. In addition to Frontier, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from JetBlue and Southwest - these airlines can fly you to your destination from $231 and $235, respectively. These flights start at 54% lower than the current average price 3 months from now.

What are the cheapest airlines to fly from Washington, D.C. to Islip, New York one-way?

$80 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on JetBlue and Southwest, with prices starting from $108 and $118, respectively.

What is the cheapest day to fly from Washington, D.C. to Islip, New York?

Travelers seeking maximum savings on their Washington, D.C. to Islip, New York flight should consider departing on Tuesday mornings when fares are most often at their lowest. Wednesday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

What are the most popular routes from Washington, D.C. to Islip, New York?

When deciding which route to take from Washington, D.C. to Islip, New York consider Baltimore/Washington - Islip Long Island, Washington, D.C. Dulles Intl - Islip Long Island or Washington, D.C. Reagan-National - Islip Long Island as they are the most popular.

What is the cheapest day to fly round-trip from Washington, D.C. to Islip, New York?

Users have found that flying from Washington, D.C. to Islip, New York on a Saturday typically leans towards higher prices. However, this doesn’t mean you still can’t find a deal. Flexibility with other aspects of your flight can still land a great price for your trip.

How far in advance should I book a flight from Washington, D.C. to Islip, New York?

Find a great deal and save up to 110% by booking at least 36 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from Washington, D.C. to Islip, New York within the next two weeks, with the cheapest ticket starting at $294.

What is the cheapest month to fly from Washington, D.C. to Islip, New York?

Flights from Washington, D.C. to Islip, New York lean towards being more expensive in December. Prices are generally better when you fly from Washington, D.C. to Islip, New York in September, with the cheapest ticket starting at $147.

Most accurate provider : When it comes to deals on Washington, D.C.-Islip, New York flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Washington, D.C.-Islip, New York flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Washington, D.C.-Islip, New York flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Washington, D.C.-Islip, New York 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 Washington, D.C.-Islip, New York flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

What airport do you fly into for flights to Islip from Washington, D.C.?

Located just 7.2 mi from the city center, Islip Long Island is the airport most travelers will use when flying to Islip from Washington, D.C.. Booking flights from Washington, D.C. to Long Island (ISP) should be relatively easy as there are 0 daily inbound flights from Washington, D.C. from 1 airline.

Can I find deals for flights from Washington, D.C. to Islip that include hotel bookings?

Yes. In addition to deals on Washington, D.C. to Islip flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Washington, D.C. to Islip?

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

Can I find deals for business class flights from Washington, D.C. to Islip?

Yes. Cheapflights offers flight deals from Washington, D.C. 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.

$80+ Save on Flights from Washington, D.C. to Islip, NY

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Cheap flight deals from Washington, D.C. to Islip

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$180 (Frontier)
One-way from	$80 (Frontier)
Popular in	January
Cheapest in	April
Average price	$320
Good round-trip deal	$295 or less
Good one-way deal	$170 or less

Provider with most accurate pricing for Washington, D.C. (WAS)-Islip Long Island flight deals.

Search Deals

Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-Islip Long Island flights.

Search Deals

From Washington, D.C. (WAS) to Islip Long Island

Search Deals

One-way flight from Washington, D.C. (WAS) to Islip Long Island

Search Deals

Highest demand for flights based on searches. 12% potential increase in price ($55 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease ($12 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in March 2025

Search Deals

Price to beat on a round-trip flight from Washington, D.C. (WAS) to Islip Long Island.

Search Deals

Price to beat on a one-way flight from Washington, D.C. (WAS) to Islip Long Island.

Search Deals

Find flight deals from Washington, D.C. to Islip

Cheapest flights from Washington, D.C. to Islip
Explore the most affordable flight options available from Washington, D.C. to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 25, 2025.

Sat 4/512:48 pmIAD - ISP

1 stop7h 16mFrontier

Sun 4/62:23 pmISP - IAD

1 stop6h 21mFrontier

Deal found 3/24

$189

Wed 6/114:15 pmDCA - ISP

1 stop4h 53mJetBlue

Wed 6/186:00 amISP - DCA

1 stop3h 41mJetBlue

Deal found 3/23

$231

Wed 4/239:40 pmBWI - ISP

Nonstop1h 10mSouthwest

Wed 4/304:00 pmISP - BWI

Nonstop1h 15mSouthwest

Deal found 3/24

$235

Thu 6/1212:55 pmDCA - ISP

1 stop9h 15mSouthwest

Mon 6/165:05 amISP - DCA

1 stop10h 50mSouthwest

Deal found 3/24

$378

Wed 4/2311:25 amBWI - ISP

3 stops22h 46mMultiple Airlines

Wed 4/307:19 pmISP - BWI

1 stop24h 58mMultiple Airlines

Deal found 3/24

$513

Tue 4/88:25 amIAD - ISP

3 stops33h 15mMultiple Airlines

Sat 4/126:20 pmISP - IAD

3 stops41h 04mMultiple Airlines

Deal found 3/24

$904

Best flights from Washington, D.C. to Islip
Discover carefully curated flight deals from Washington, D.C. to Islip that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 25, 2025.

Sat 5/39:24 amIAD - ISP

1 stop6h 09mFrontier

Sun 5/49:40 pmISP - IAD

1 stop10h 44mFrontier

Deal found 3/23

$180

Wed 6/114:15 pmDCA - ISP

1 stop4h 53mJetBlue

Wed 6/186:00 amISP - DCA

1 stop3h 41mJetBlue

Deal found 3/23

$231

Wed 4/237:10 pmBWI - ISP

Nonstop1h 10mSouthwest

Wed 4/304:00 pmISP - BWI

Nonstop1h 15mSouthwest

Deal found 3/24

$235

Wed 4/2311:25 amBWI - ISP

3 stops22h 46mMultiple Airlines

Wed 4/307:19 pmISP - BWI

1 stop24h 58mMultiple Airlines

Deal found 3/24

$513

Thu 6/1212:55 pmDCA - ISP

1 stop9h 15mSouthwest

Mon 6/165:05 amISP - DCA

1 stop10h 50mSouthwest

Deal found 3/24

$378

Fri 6/138:25 amIAD - ISP

3 stops34h 14mMultiple Airlines

Sun 6/157:49 pmISP - IAD

1 stop14h 31mMultiple Airlines

Deal found 3/22

$640

Last-minute flights from Washington, D.C. to Islip
Discover last-minute flight deals from Washington, D.C. to Islip. Data last updated March 25, 2025 and is based on user searches.

Fri 4/49:18 amIAD - ISP

1 stop6h 23mFrontier

Sun 4/62:23 pmISP - IAD

1 stop6h 21mFrontier

Deal found 3/24

$208

Sat 4/512:48 pmIAD - ISP

1 stop7h 16mFrontier

Sun 4/62:23 pmISP - IAD

1 stop6h 21mFrontier

Deal found 3/24

$189

Tue 4/88:25 amIAD - ISP

3 stops33h 15mMultiple Airlines

Sat 4/126:20 pmISP - IAD

3 stops41h 04mMultiple Airlines

Deal found 3/24

$904

Wed 4/239:40 pmBWI - ISP

Nonstop1h 10mSouthwest

Wed 4/304:00 pmISP - BWI

Nonstop1h 15mSouthwest

Deal found 3/24

$235

Wed 4/231:20 pmDCA - ISP

1 stop8h 50mSouthwest

Wed 4/307:30 amISP - DCA

1 stop9h 25mSouthwest

Deal found 3/24

$512

Wed 4/2311:25 amBWI - ISP

3 stops22h 46mMultiple Airlines

Wed 4/307:19 pmISP - BWI

1 stop24h 58mMultiple Airlines

Deal found 3/24

$513

One-way flights from Washington, D.C. to Islip
Search for one-way flight options from Washington, D.C. to Islip. Find affordable one-way fares based on user searches. Data last updated March 25, 2025.

Sat 4/512:48 pmIAD - ISP

1 stop7h 16mFrontier

Deal found 3/24

$80

Sat 5/313:15 pmDCA - ISP

1 stop6h 13mJetBlue

Deal found 3/24

$108

Thu 4/244:15 pmBWI - ISP

Nonstop1h 10mSouthwest

Deal found 3/24

$118

Wed 7/212:23 pmBWI - ISP

1 stop7h 13mFrontier

Deal found 3/24

$186

Sun 6/16:55 amDCA - ISP

1 stop6h 25mSouthwest

Deal found 3/23

$194

Wed 6/185:45 amBWI - ISP

3 stops37h 19mMultiple Airlines

Deal found 3/24

$211

Fri 4/1112:55 pmIAD - ISP

3 stops28h 45mMultiple Airlines

Deal found 3/24

$305

Sun 4/68:25 amIAD - ISP

1 stop26h 37mBreeze Airways

Deal found 3/24

$382

Cheapflights Fare Finder

Use the filters below to find and compare flights from Washington, D.C. to Islip that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Sat 4/5

12:48 pm-8:04 pm

1 stop7h 16m

Islip Long Island

Sun 4/6

2:23 pm-8:44 pm

1 stop6h 21m

$189

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Wed 6/11

4:15 pm-9:08 pm

1 stop4h 53m

Islip Long Island

Wed 6/18

6:00 am-9:41 am

1 stop3h 41m

$231

BaltimoreIslip

BWI - ISP

BWIISP

Baltimore/Washington

Wed 4/23

9:40 pm-10:50 pm

Nonstop1h 10m

Islip Long Island

Wed 4/30

4:00 pm-5:15 pm

Nonstop1h 15m

$235

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Thu 6/12

12:55 pm-10:10 pm

1 stop9h 15m

Islip Long Island

Mon 6/16

5:05 am-3:55 pm

1 stop10h 50m

$378

BaltimoreIslip

BWI - ISP

BWIISP

Baltimore/Washington

Wed 4/23

11:25 am-10:11 am

3 stops22h 46m

Islip Long Island

Wed 4/30

7:19 pm-8:17 pm

1 stop24h 58m

$513

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Tue 4/8

8:25 am-5:40 pm

3 stops33h 15m

Islip Long Island

Sat 4/12

6:20 pm-11:24 am

3 stops41h 04m

$904

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Sat 4/5

12:48 pm-8:04 pm

1 stop7h 16m

$80

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Sat 5/31

3:15 pm-9:28 pm

1 stop6h 13m

$108

BaltimoreIslip

BWI - ISP

BWIISP

Baltimore/Washington

Thu 4/24

4:15 pm-5:25 pm

Nonstop1h 10m

$118

BaltimoreIslip

BWI - ISP

BWIISP

Baltimore/Washington

Wed 7/2

12:23 pm-7:36 pm

1 stop7h 13m

$186

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/24

Showing 1-10 of 14 results

Compare providers for flights from Washington, D.C. to Islip

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Washington, D.C. to Islip in March.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*3 stars
eDreams	Price Accuracy3 stars	Trust 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 Washington, D.C.-Islip, New York flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Washington, D.C.-Islip, New York flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Washington, D.C.-Islip, New York flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Washington, D.C.-Islip, New York 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 Washington, D.C.-Islip, New York 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 Washington, D.C. to Islip

Have a flexible travel schedule? Discover the best time to fly to Islip from Washington, D.C. 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 Washington, D.C. to Islip

What is the cheapest month to book a flight from Washington, D.C. to Islip, New York?

Currently, January is the cheapest month in which you can book a flight from Washington, D.C. to Islip, New York (average of $108). Flying from Washington, D.C. 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.

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

When flying from Washington, D.C. to Islip, New York, the time of day you fly usually plays a role in the price. Save by searching for a flight at noon, which can drop the price by up to 11% versus a flight in the morning.

Rainfall in Islip by month

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.

Temperature in Islip by month

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).

Reviews of airlines servicing Islip

Peruse reviews from past customers who have flown with Southwest, Breeze Airways and JetBlue from Washington, D.C. to Islip 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

4,272 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Southwest

8.0

Very good

4,272 reviews

Southwest

8.0

Very good

4,272 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Breeze Airways

8.0

Very good

156 reviews

Southwest

8.0

Very good

4,272 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

JetBlue

7.3

Good

2,924 reviews

Southwest

8.0

Very good

4,272 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Frontier

6.0

Okay

3,273 reviews

Southwest

8.0

Very good

4,272 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Related info for your journey

What airport do you fly into for flights to Islip from Washington, D.C.?
Located just 7.2 mi from the city center, Islip Long Island is the airport most travelers will use when flying to Islip from Washington, D.C.. Booking flights from Washington, D.C. to Long Island (ISP) should be relatively easy as there are 0 daily inbound flights from Washington, D.C. from 1 airline.
What are the cheapest airlines flying from Washington, D.C. to Islip, New York round-trip?
Currently priced at $180, Frontier will fly you from Washington, D.C. to Islip, New York and back. In addition to Frontier, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from JetBlue and Southwest - these airlines can fly you to your destination from $231 and $235, respectively. These flights start at 54% lower than the current average price 3 months from now.
What are the cheapest airlines to fly from Washington, D.C. to Islip, New York one-way?
$80 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on JetBlue and Southwest, with prices starting from $108 and $118, respectively.
What are the most popular routes from Washington, D.C. to Islip, New York?
When deciding which route to take from Washington, D.C. to Islip, New York consider Baltimore/Washington - Islip Long Island, Washington, D.C. Dulles Intl - Islip Long Island or Washington, D.C. Reagan-National - Islip Long Island as they are the most popular.
Can I find deals for flights from Washington, D.C. to Islip that include hotel bookings?
Yes. In addition to deals on Washington, D.C. to Islip flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Washington, D.C. to Islip?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington, D.C. to Islip.
Can I find deals for business class flights from Washington, D.C. to Islip?
Yes. Cheapflights offers flight deals from Washington, D.C. 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 Washington, D.C. to Islip, New York?
Currently, January is the cheapest month in which you can book a flight from Washington, D.C. to Islip, New York (average of $108). Flying from Washington, D.C. 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.

See more FAQs

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Alternative routes for Washington, D.C. to Islip

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Other flights to Islip

Top airline flying from Washington, D.C. to Islip

Airline	Cheapest	Average	Flexibility	On-time
Southwest	Cheapest$260	Average$375	FlexibilityNo cancel fee	On-time63%

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$80+ Cheap flights from Washington, D.C. (WAS) to Islip, NY (ISP)

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 4/5. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Washington, D.C. to Islip with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

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Cheap flight deals from Washington, D.C. to Islip

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Round-trip from

One-way from

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Good round-trip deal

Good one-way deal

Find flight deals from Washington, D.C. to Islip

Cheapest flights from Washington, D.C. to IslipExplore the most affordable flight options available from Washington, D.C. to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 25, 2025.

Explore the most affordable flight options available from Washington, D.C. to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 25, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Washington, D.C. to Islip that are best for you.

Compare providers for flights from Washington, D.C. to Islip

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 Washington, D.C. to Islip in March.

Best time to book a flight from Washington, D.C. to Islip

Have a flexible travel schedule? Discover the best time to fly to Islip from Washington, D.C. with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. to Islip

What is the cheapest month to book a flight from Washington, D.C. to Islip, New York?

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

Find hourly flight availability from Washington, D.C. to Islip. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated March 25, 2025.

Rainfall in Islip by month

Plan your trip to Islip by taking into account the average rainfall totals by month.

Temperature in Islip by month

Plan your trip to Islip by taking into account the average temperature totals by month.

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 March 25, 2025.

Peruse reviews from past customers who have flown with Southwest, Breeze Airways and JetBlue from Washington, D.C. to Islip 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.

Related info for your journey

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

What airport do you fly into for flights to Islip from Washington, D.C.?

What are the cheapest airlines flying from Washington, D.C. to Islip, New York round-trip?

What are the cheapest airlines to fly from Washington, D.C. to Islip, New York one-way?

What are the most popular routes from Washington, D.C. to Islip, New York?

Can I find deals for flights from Washington, D.C. to Islip that include hotel bookings?

How can I find direct flights from Washington, D.C. to Islip?

Can I find deals for business class flights from Washington, D.C. to Islip?

What is the cheapest month to book a flight from Washington, D.C. to Islip, New York?

Traveling to a place near Washington, D.C.?

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Alternative routes for Washington, D.C. to Islip

See prices for flight routes from nearby airports that may be better suited for you.

Top airline flying from Washington, D.C. to Islip

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Cheapest flights from Washington, D.C. to Islip
Explore the most affordable flight options available from Washington, D.C. to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 25, 2025.