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

According to our current data, Frontier ($130), and Southwest ($412) 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 67% less than the average price by searching for these airlines.

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

To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $75. Southwest flights start at $123 while deals on JetBlue start at $186 one-way.

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 55 days before your planned departure. Booking around this time can save you about 111% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $298 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $481.

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

September is one of the best times of the year to fly to Washington, D.C. from Islip, New York. Prices for September average $252 per person but you can even find prices for as low as $117. The most expensive prices can be found in the month of December. Opting for a September flight can save you 18% 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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Islip, New York-Washington, D.C. flight deals on Cheapflights vs. FlightHub >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 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 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.

$61+ Save on Flights from Islip, NY to Washington, D.C.

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1. Tell us where you want to go

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

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$130 (Frontier)
One-way from	$75 (Cheapflightsfares)
Popular in	August
Cheapest in	March
Average price	$320
Good round-trip deal	$347 or less
Good one-way deal	$188 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.

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

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

Search Deals

Highest demand for flights based on searches. 7% potential increase in price ($32 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 7% potential price decrease ($30 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in February 2025

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

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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 febrero 20, 2025.

jue. 3/69:04 pmISP - BWI

1 stop10h 17mFrontier

jue. 3/138:21 amBWI - ISP

1 stop11h 43mFrontier

Deal found 2/20

$150

sáb. 3/82:35 pmISP - BWI

2 stops9h 41mMultiple Airlines

mié. 3/126:50 amBWI - ISP

2 stops29h 26mMultiple Airlines

Deal found 2/20

$248

mié. 4/99:00 amISP - DCA

2 stops27h 04mFrontier

mié. 4/167:00 amDCA - ISP

2 stops25h 10mFrontier

Deal found 2/19

$397

vie. 2/282:00 pmISP - DCA

1 stop6h 40mSouthwest

dom. 3/27:30 amDCA - ISP

1 stop5h 55mSouthwest

Deal found 2/19

$507

jue. 2/275:45 amISP - BWI

Nonstop1h 20mSouthwest

lun. 3/33:50 pmBWI - ISP

Nonstop1h 10mSouthwest

Deal found 2/20

$543

dom. 4/2710:39 amISP - DCA

1 stop6h 51mJetBlue

vie. 5/24:15 pmDCA - ISP

1 stop4h 53mJetBlue

Deal found 2/19

$569

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 febrero 20, 2025.

mar. 3/49:33 pmISP - BWI

1 stop9h 48mFrontier

mar. 3/118:21 amBWI - ISP

1 stop11h 43mFrontier

Deal found 2/18

$130

lun. 3/38:25 pmISP - BWI

2 stops26h 14mMultiple Airlines

mié. 3/512:00 pmBWI - ISP

2 stops22h 11mMultiple Airlines

Deal found 2/18

$193

vie. 4/44:20 pmISP - DCA

1 stop6h 00mSouthwest

dom. 4/67:35 amDCA - ISP

1 stop9h 50mSouthwest

Deal found 2/20

$412

mié. 3/53:50 pmISP - BWI

Nonstop1h 30mSouthwest

jue. 3/64:15 pmBWI - ISP

Nonstop1h 10mSouthwest

Deal found 2/19

$429

Last-minute flights from Islip to Washington, D.C.
Discover last-minute flight deals from Islip to Washington, D.C.. Data last updated febrero 20, 2025 and is based on user searches.

jue. 2/279:07 amISP - BWI

1 stop6h 23mFrontier

lun. 3/38:21 amBWI - ISP

1 stop11h 43mFrontier

Deal found 2/20

$250

jue. 2/275:45 amISP - BWI

Nonstop1h 20mSouthwest

lun. 3/33:50 pmBWI - ISP

Nonstop1h 10mSouthwest

Deal found 2/20

$543

vie. 2/2812:56 pmISP - BWI

3 stops33h 29mMultiple Airlines

dom. 3/28:39 pmBWI - ISP

2 stops23h 06mMultiple Airlines

Deal found 2/20

$320

vie. 2/282:00 pmISP - DCA

1 stop6h 40mSouthwest

dom. 3/27:30 amDCA - ISP

1 stop5h 55mSouthwest

Deal found 2/19

$507

lun. 3/32:10 pmISP - DCA

1 stop8h 49mJetBlue

mié. 3/511:30 amDCA - ISP

1 stop8h 10mJetBlue

Deal found 2/18

$657

jue. 3/69:04 pmISP - BWI

1 stop10h 17mFrontier

jue. 3/138:21 amBWI - ISP

1 stop11h 43mFrontier

Deal found 2/20

$150

sáb. 3/82:35 pmISP - BWI

2 stops9h 41mMultiple Airlines

mié. 3/126:50 amBWI - ISP

2 stops29h 26mMultiple Airlines

Deal found 2/20

$248

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 febrero 20, 2025.

mié. 3/59:41 amISP - BWI

1 stop6h 29mFrontier

Deal found 2/19

$75

jue. 3/206:00 amISP - BWI

Nonstop1h 15mSouthwest

Deal found 2/20

$123

mié. 3/121:34 pmISP - DCA

1 stop9h 25mJetBlue

Deal found 2/19

$186

jue. 3/137:50 amISP - DCA

1 stop8h 55mSouthwest

Deal found 2/19

$224

Find flights from Islip to Washington, D.C. within your budget

Fly from

Fly to

Route

Depart

Return

Price

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

mar. 3/4

9:33 pm-7:21 am

1 stop9h 48m

Baltimore/Washington

mar. 3/11

8:21 am-8:04 pm

1 stop11h 43m

$130

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

lun. 3/3

8:25 pm-10:39 pm

2 stops26h 14m

Baltimore/Washington

mié. 3/5

12:00 pm-10:11 am

2 stops22h 11m

$193

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

vie. 4/4

4:20 pm-10:20 pm

1 stop6h 00m

Washington, D.C. Reagan-National

dom. 4/6

7:35 am-5:25 pm

1 stop9h 50m

$412

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

mié. 3/5

3:50 pm-5:20 pm

Nonstop1h 30m

Baltimore/Washington

jue. 3/6

4:15 pm-5:25 pm

Nonstop1h 10m

$429

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

lun. 3/17

9:04 pm-7:21 am

1 stop10h 17m

$61

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

jue. 3/20

6:00 am-7:15 am

Nonstop1h 15m

$123

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

jue. 3/13

12:56 pm-9:15 am

2 stops20h 19m

$130

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

sáb. 3/8

1:24 pm-10:59 pm

1 stop9h 35m

$241

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/18

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 February.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	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 Islip, New York-Washington, D.C. flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Islip, New York-Washington, D.C. flight deals on Cheapflights vs. FlightHub >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 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 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.

Travel insights for flights from Islip to Washington, D.C.

Get recent, data-driven insights about flights from Islip to Washington, D.C. including ideal travel times, pricing trends, and more.

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 $389). 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.

Get a feel of what it's like to fly with Southwest, JetBlue and Frontier from Islip to Washington, D.C. by reading reviews from past customers. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Southwest

8.1

Very good

4,411 reviews

Reviews

1 / 20

2.0

Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Southwest

8.1

Very good

4,411 reviews

Southwest

8.1

Very good

4,411 reviews

Reviews

1 / 20

2.0

Mediocre

Anonymous,Feb 2025

MCO - STL

JetBlue

7.4

Good

3,070 reviews

Southwest

8.1

Very good

4,411 reviews

Reviews

1 / 20

2.0

Mediocre

Anonymous,Feb 2025

MCO - STL

Frontier

6.0

Okay

3,355 reviews

Southwest

8.1

Very good

4,411 reviews

Reviews

1 / 20

2.0

Mediocre

Anonymous,Feb 2025

MCO - STL

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, Frontier ($130), and Southwest ($412) 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 67% less than the average price by searching for these airlines.
What are the cheapest airlines to fly from Islip, New York to Washington, D.C. one-way?
To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $75. Southwest flights start at $123 while deals on JetBlue start at $186 one-way.
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 $389). 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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Fairfax

Springfield

Rockville

Tysons

Gaithersburg

Silver Spring

Fredericksburg

Linthicum Heights

Laurel

Falls Church

Woodbridge

Easton

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Bowie

Reston

National Harbor

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Gettysburg

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$297	Average$361	FlexibilityNo cancel fee	On-time63%

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$61+ 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 3/17. 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 febrero 20, 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 febrero 20, 2025.

Find flights from Islip to Washington, D.C. within your budget

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 February.

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.

Travel insights for flights from Islip to Washington, D.C.

Get recent, data-driven insights about flights from Islip to Washington, D.C. including ideal travel times, pricing trends, and more.

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 febrero 20, 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.

Get a feel of what it's like to fly with Southwest, JetBlue and Frontier from Islip to Washington, D.C. by reading reviews from past customers. 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 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?

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

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?

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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 febrero 20, 2025.