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

According to our current data, Southwest ($245), and JetBlue ($343) offers the cheapest pricing from Islip, New York to Washington, D.C.. You may be able to fly from Islip, New York to Washington, D.C. for 41% less than the average price by searching for these airlines.

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

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

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

Thursday is generally a great day to depart. Flying on this day could help you save up to 40%.

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

To save on the cost of your flight from Islip, New York to Washington, D.C., book at least 36 days before your planned departure. Booking around this time can save you about 172% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $301 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $451.

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

April is one of the best times of the year to fly to Washington, D.C. from Islip, New York. Prices for April average $236 per person but you can even find prices for as low as $91. The most expensive prices can be found in the month of December. Opting for a April flight can save you 26% on your journey compared to booking in December

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

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

What airport do you fly from for flights from Islip to 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 Washington, D.C. from Islip. Booking flights from Long Island (ISP) to Washington, D.C. should be relatively easy as there are 0 daily outbound flights to Washington, D.C. from 1 airline.

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

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

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

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

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

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

$109+ Flights from Islip, NY to Washington, D.C.

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1. Tell us where you want to go

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3. Compare prices and book

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

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$245 (Southwest)
One-way from	$109 (Southwest)
Popular in	August
Cheapest in	May
Average price	$429
Good round-trip deal	$334 or less
Good one-way deal	$183 or less

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

Search Deals

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

Search Deals

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

Search Deals

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

Search Deals

Highest demand for flights based on searches. 3% potential increase in price ($12 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 5% potential price decrease ($23 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in April 2025

Search Deals

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

Search Deals

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

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

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

jue. 5/295:40 amISP - BWI

Nonstop1h 15mSouthwest

jue. 6/510:55 pmBWI - ISP

Nonstop1h 10mSouthwest

Deal found 4/29

$245

vie. 7/185:05 amISP - DCA

1 stop6h 20mSouthwest

dom. 7/2011:35 amDCA - ISP

1 stop5h 45mSouthwest

Deal found 4/27

$327

mar. 5/131:41 pmISP - DCA

1 stop7h 08mJetBlue

sáb. 5/177:00 amDCA - ISP

1 stop9h 50mJetBlue

Deal found 4/28

$343

jue. 5/297:39 pmISP - BWI

2 stops21h 25mMultiple Airlines

jue. 6/511:54 amBWI - ISP

2 stops22h 10mMultiple Airlines

Deal found 4/29

$423

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

lun. 5/265:40 amISP - BWI

Nonstop1h 15mSouthwest

lun. 6/27:10 pmBWI - ISP

Nonstop1h 10mSouthwest

Deal found 4/28

$245

mar. 5/131:41 pmISP - DCA

1 stop7h 08mJetBlue

sáb. 5/177:00 amDCA - ISP

1 stop9h 50mJetBlue

Deal found 4/28

$343

vie. 6/610:44 amISP - BWI

2 stops25h 02mMultiple Airlines

dom. 6/88:26 amBWI - ISP

2 stops25h 38mMultiple Airlines

Deal found 4/28

$477

vie. 7/185:05 amISP - DCA

1 stop6h 20mSouthwest

dom. 7/2011:35 amDCA - ISP

1 stop5h 45mSouthwest

Deal found 4/27

$327

Last-minute flights from Islip to Washington, D.C.
Discover last-minute flight deals from Islip to Washington, D.C.. Data last updated abril 29, 2025 and is based on user searches.

lun. 5/53:59 pmISP - BWI

2 stops18h 26mMultiple Airlines

mié. 5/72:59 pmBWI - ISP

3 stops28h 00mMultiple Airlines

Deal found 4/29

$778

vie. 5/95:40 amISP - BWI

Nonstop1h 15mSouthwest

dom. 5/1110:40 amBWI - ISP

Nonstop1h 10mSouthwest

Deal found 4/28

$397

vie. 5/95:00 amISP - DCA

1 stop6h 10mSouthwest

dom. 5/116:55 amDCA - ISP

1 stop6h 25mSouthwest

Deal found 4/27

$447

mar. 5/131:41 pmISP - DCA

1 stop7h 08mJetBlue

sáb. 5/177:00 amDCA - ISP

1 stop9h 50mJetBlue

Deal found 4/28

$343

mié. 5/142:25 pmISP - BWI

2 stops28h 27mMultiple Airlines

dom. 5/188:26 amBWI - ISP

2 stops25h 38mMultiple Airlines

Deal found 4/29

$498

dom. 5/184:20 pmISP - DCA

1 stop6h 15mSouthwest

mar. 5/207:30 amDCA - ISP

1 stop7h 40mSouthwest

Deal found 4/28

$338

lun. 5/265:40 amISP - BWI

Nonstop1h 15mSouthwest

lun. 6/27:10 pmBWI - ISP

Nonstop1h 10mSouthwest

Deal found 4/28

$245

One-way flights from Islip to Washington, D.C.
Search for one-way flight options from Islip to Washington, D.C.. Find affordable one-way fares based on user searches. Data last updated abril 29, 2025.

jue. 7/312:05 pmISP - BWI

Nonstop1h 20mSouthwest

Deal found 4/28

$109

mié. 6/116:25 amISP - DCA

1 stop9h 20mSouthwest

Deal found 4/29

$120

mar. 6/312:59 pmISP - DCA

1 stop7h 50mJetBlue

Deal found 4/29

$147

dom. 6/19:27 amISP - BWI

2 stops33h 25mMultiple Airlines

Deal found 4/28

$161

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

jue. 5/29

5:40 am-6:55 am

Nonstop1h 15m

Baltimore/Washington

jue. 6/5

10:55 pm-12:05 am

Nonstop1h 10m

$245

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

vie. 7/18

5:05 am-11:25 am

1 stop6h 20m

Washington, D.C. Reagan-National

dom. 7/20

11:35 am-5:20 pm

1 stop5h 45m

$327

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

mar. 5/13

1:41 pm-8:49 pm

1 stop7h 08m

Washington, D.C. Reagan-National

sáb. 5/17

7:00 am-4:50 pm

1 stop9h 50m

$343

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

jue. 5/29

7:39 pm-5:04 pm

2 stops21h 25m

Baltimore/Washington

jue. 6/5

11:54 am-10:04 am

2 stops22h 10m

$423

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

jue. 7/3

12:05 pm-1:25 pm

Nonstop1h 20m

$109

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

mié. 6/11

6:25 am-3:45 pm

1 stop9h 20m

$120

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

mar. 6/3

12:59 pm-8:49 pm

1 stop7h 50m

$147

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

mié. 6/11

2:55 pm-4:39 pm

1 stop25h 44m

$168

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

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

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

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
eDreams	Price Accuracy3 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*2 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-Washington, D.C. flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Islip, New York-Washington, D.C. flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Islip, New York-Washington, D.C. flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Islip, New York-Washington, D.C. flights, Cheapflights users trust eDreams the most. eDreams 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-Washington, D.C. 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 Washington, D.C.

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

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

Currently, August is the cheapest month in which you can book a flight from Islip, New York to Washington, D.C. (average of $309). Flying from Islip, New York to Washington, D.C. in June is currently the most expensive (average of $373). 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 WAS?

When flying from Islip, New York to Washington, D.C., the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 26% versus a flight in the morning.

Rainfall in Washington, D.C. by month

In terms of precipitation, rainfall in Washington, D.C. ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Washington, D.C. when rainfall is around 2.6 in.

Temperature in Washington, D.C. by month

If weather is an important factor for your trip to Washington, D.C., 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 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

Reviews of airlines servicing Washington, D.C.

Southwest

8.0

Very good

4,295 reviews

Reviews

1 / 20

10.0

Excellent

Gina,Apr 2025

LAS - DEN

Good, the crew was friendly and helpful. The pilot had great skills in keeping the plane stable through rough turbulence. Smooth landing, too! Thank you!

Southwest

8.0

Very good

4,295 reviews

Southwest

8.0

Very good

4,295 reviews

Reviews

1 / 20

10.0

Excellent

Gina,Apr 2025

LAS - DEN

Good, the crew was friendly and helpful. The pilot had great skills in keeping the plane stable through rough turbulence. Smooth landing, too! Thank you!

JetBlue

7.3

Good

2,922 reviews

Southwest

8.0

Very good

4,295 reviews

Reviews

1 / 20

10.0

Excellent

Gina,Apr 2025

LAS - DEN

Good, the crew was friendly and helpful. The pilot had great skills in keeping the plane stable through rough turbulence. Smooth landing, too! Thank you!

Related info for your journey

What airport do you fly from for flights from Islip to 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 Washington, D.C. from Islip. Booking flights from Long Island (ISP) to Washington, D.C. should be relatively easy as there are 0 daily outbound flights to Washington, D.C. from 1 airline.
What are the cheapest airlines flying from Islip, New York to Washington, D.C. round-trip?
According to our current data, Southwest ($245), and JetBlue ($343) offers the cheapest pricing from Islip, New York to Washington, D.C.. You may be able to fly from Islip, New York to Washington, D.C. for 41% less than the average price by searching for these airlines.
Can I find deals for flights from Islip to Washington, D.C. that include hotel bookings?
Yes. In addition to deals on Islip to Washington, D.C. flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Islip to Washington, D.C.?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Islip to Washington, D.C..
Can I find deals for business class flights from Islip to Washington, D.C.?
Yes. Cheapflights offers flight deals from Islip to Washington, D.C. 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 Washington, D.C.?
Currently, August is the cheapest month in which you can book a flight from Islip, New York to Washington, D.C. (average of $309). Flying from Islip, New York to Washington, D.C. in June is currently the most expensive (average of $373). 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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Arlington

Woodbridge

Tysons

Fairfax

Springfield

Rockville

Fredericksburg

Silver Spring

Gaithersburg

Linthicum Heights

Falls Church

Laurel

Easton

Towson

Herndon

Bowie

National Harbor

Oxon Hill

Reston

Browse thousands of different options on Cheapflights for your next trip

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

Airline	Cheapest	Average	Flexibility	On-time
Southwest	Cheapest$278	Average$343	FlexibilityNo cancel fee	On-time63%

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$109+ Cheap flights from Islip, NY (ISP) to Washington, D.C. (WAS)

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 7/3. Fares are subject to change and may not be available on all flights or dates of travel.

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

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

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

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

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

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

Explore the most affordable flight options available from Islip to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on abril 29, 2025.

Cheapflights Fare Finder

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

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

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 Washington, D.C. in April.

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

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

Cheapflights Insights

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

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

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

Find hourly flight availability from Islip to Washington, D.C.. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated abril 29, 2025.

Rainfall in Washington, D.C. by month

Plan your trip to Washington, D.C. by taking into account the average rainfall totals by month.

Temperature in Washington, D.C. by month

Plan your trip to Washington, D.C. by taking into account the average temperature totals by month.

Reviews of airlines servicing Washington, D.C.

Related info for your journey

Find useful and relevant information for your journey from Islip to Washington, D.C.. 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 from for flights from Islip to Washington, D.C.?

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

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

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

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

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

Traveling to a place near Islip?

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Islip to Washington, D.C.

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

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