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Cheap flights from Islip to Washington, D.C. from $84

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Islip to Washington, D.C. departing on 12/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Islip to Washington, D.C.

Cheap round-trip flights

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Frontier Logo
9:49 am - 5:24 pmISP-BWI
7h 35m1 stop
Frontier Logo
11:19 am - 8:42 pmBWI-ISP
9h 23m1 stop
$162Frontier
Find Deal
Fri, Oct 17 - Tue, Oct 21
Frontier Logo
4:58 pm - 9:05 amISP-BWI
16h 07m2 stops
Frontier Logo
11:19 am - 5:42 pmBWI-ISP
6h 23m1 stop
$191Frontier
Find Deal
Fri, Oct 24 - Tue, Oct 28
Frontier Logo
9:49 am - 5:21 pmISP-BWI
7h 32m1 stop
Frontier Logo
4:12 pm - 9:44 amBWI-ISP
17h 32m2 stops
$197Frontier
Find Deal
Thu, Oct 16 - Mon, Oct 20
Frontier Logo
9:49 am - 5:24 pmISP-BWI
7h 35m1 stop
Frontier Logo
10:00 pm - 9:04 amBWI-ISP
11h 04m1 stop
$205Frontier
Find Deal
Fri, Oct 17 - Sun, Oct 19
Multiple Airlines Logo
9:37 pm - 12:40 pmISP-BWI
15h 03m1 stop
Multiple Airlines Logo
11:31 am - 8:42 pmBWI-ISP
9h 11m1 stop
$214Multiple Airlines
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Tue, Oct 21 - Thu, Oct 23
Southwest Logo
5:40 am - 7:00 amISP-BWI
1h 20mnonstop
Southwest Logo
2:10 pm - 3:20 pmBWI-ISP
1h 10mnonstop
$217Southwest
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Tue, Nov 4 - Tue, Nov 11
Southwest Logo
6:00 am - 7:15 amISP-BWI
1h 15mnonstop
Southwest Logo
10:35 pm - 11:45 pmBWI-ISP
1h 10mnonstop
$231Southwest
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Tue, Oct 21 - Thu, Oct 23
Multiple Airlines Logo
4:58 pm - 9:21 amISP-BWI
16h 23m1 stop
Multiple Airlines Logo
4:31 pm - 5:42 pmBWI-ISP
25h 11m1 stop
$235Multiple Airlines
Find Deal
Fri, Oct 24 - Mon, Oct 27
JetBlue Logo
10:44 am - 5:02 pmISP-DCA
6h 18m1 stop
JetBlue Logo
6:30 am - 12:51 pmDCA-ISP
6h 21m1 stop
$358JetBlue
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Thu, Nov 13 - Sun, Nov 16
JetBlue Logo
1:57 pm - 10:29 pmISP-DCA
8h 32m1 stop
JetBlue Logo
6:45 am - 1:02 pmDCA-ISP
6h 17m1 stop
$480JetBlue
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Sun, Oct 26 - Wed, Oct 29

Southwest flights from Islip to Washington, D.C.

Our best Southwest deals on Islip to Washington, D.C. flight tickets
Southwest
Nov 4
ISP5:40 amIslip Long Island
1h 20m
BWI7:00 amBaltimore/Washington
Nov 11
BWI2:10 pmBaltimore/Washington
1h 10m
ISP3:20 pmIslip Long Island
$217
Find similar
Southwest
Oct 21
ISP6:00 amIslip Long Island
1h 15m
BWI7:15 amBaltimore/Washington
Oct 23
BWI10:35 pmBaltimore/Washington
1h 10m
ISP11:45 pmIslip Long Island
$231
Find similar
Southwest
Oct 24
ISP5:30 amIslip Long Island
1h 15m
BWI6:45 amBaltimore/Washington
Oct 27
BWI10:35 pmBaltimore/Washington
1h 10m
ISP11:45 pmIslip Long Island
$289
Find similar

Frontier flights from Islip to Washington, D.C.

Our best Frontier deals on Islip to Washington, D.C. flight tickets
Frontier
Oct 17
ISP9:49 amIslip Long Island
7h 35m
1 stop
BWI5:24 pmBaltimore/Washington
Oct 21
BWI11:19 amBaltimore/Washington
9h 23m
1 stop
ISP8:42 pmIslip Long Island
$162
Find similar
Frontier
Oct 24
ISP4:58 pmIslip Long Island
16h 07m
2 stops
BWI9:05 amBaltimore/Washington
Oct 28
BWI11:19 amBaltimore/Washington
6h 23m
1 stop
ISP5:42 pmIslip Long Island
$191
Find similar
Frontier
Oct 16
ISP9:49 amIslip Long Island
7h 32m
1 stop
BWI5:21 pmBaltimore/Washington
Oct 20
BWI4:12 pmBaltimore/Washington
17h 32m
2 stops
ISP9:44 amIslip Long Island
$197
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Islip to Washington, D.C. 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, momondo users made 832,500 searches. Data last updated October 2, 2025.
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

Fri 10/17

9:49 am-5:24 pm

1 stop7h 35m

Baltimore/Washington

Tue 10/21

11:19 am-8:42 pm

1 stop9h 23m

$162

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

Fri 10/24

4:58 pm-9:05 am

2 stops16h 07m

Baltimore/Washington

Tue 10/28

11:19 am-5:42 pm

1 stop6h 23m

$191

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

Thu 10/16

9:49 am-5:21 pm

1 stop7h 32m

Baltimore/Washington

Mon 10/20

4:12 pm-9:44 am

2 stops17h 32m

$197

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

Fri 10/17

9:49 am-5:24 pm

1 stop7h 35m

Baltimore/Washington

Sun 10/19

10:00 pm-9:04 am

1 stop11h 04m

$205

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

Tue 10/21

9:37 pm-12:40 pm

1 stop15h 03m

Baltimore/Washington

Thu 10/23

11:31 am-8:42 pm

1 stop9h 11m

$214

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

Tue 11/4

5:40 am-7:00 am

Nonstop1h 20m

Baltimore/Washington

Tue 11/11

2:10 pm-3:20 pm

Nonstop1h 10m

$217

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

Tue 10/21

6:00 am-7:15 am

Nonstop1h 15m

Baltimore/Washington

Thu 10/23

10:35 pm-11:45 pm

Nonstop1h 10m

$231

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

Fri 10/24

4:58 pm-9:21 am

1 stop16h 23m

Baltimore/Washington

Mon 10/27

4:31 pm-5:42 pm

1 stop25h 11m

$235

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Thu 11/13

10:44 am-5:02 pm

1 stop6h 18m

Washington, D.C. Reagan-National

Sun 11/16

6:30 am-12:51 pm

1 stop6h 21m

$358

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Sun 10/26

1:57 pm-10:29 pm

1 stop8h 32m

Washington, D.C. Reagan-National

Wed 10/29

6:45 am-1:02 pm

1 stop6h 17m

$480

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Washington, D.C. from

How to get the cheapest flight ticket from Islip to Washington, D.C.

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Washington, D.C.?

The month of May is, on average, the cheapest month to fly to Washington, D.C. from Islip, with most prices found around $296. If you’re not able to fly to Washington, D.C. in May, then January is your next best option. Flight prices from Islip to Washington, D.C. during January average around $320.

What is the cheapest day to depart on your flight to Washington, D.C.?

On average, the least expensive day to fly to Washington, D.C. from Islip is on a Friday. momondo users have found tickets for Friday departures for as low as $351. However, this price may fluctuate depending on the airline, the season, and holidays. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Islip to Washington, D.C. for around $466.

What is the cheapest time of day to depart on your flight to Washington, D.C.?

In the morning is the cheapest time of day to fly from Islip to Washington, D.C. when you can find flight prices for as low as $379. Flying to Washington, D.C. in the morning is an ideal time because this is during off-peak travel hours. Try not to purchase tickets at noon because they tend to be around $465. Of course, these prices can vary depending on the time of year and what airport you fly to.

What is the cheapest Islip Long Island to Washington, D.C. flight route?

Fly from Islip Long Island to Baltimore/Washington for the best Islip Long Island - Washington, D.C. flight prices

What cabin class options are available on Islip Long Island to Washington, D.C. flights?

There is only 1 cabin class available to choose from on Islip Long Island to Washington, D.C. flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Islip to Washington, D.C. flights?

You could potentially save up to 24% on your flight if you consider stops on a Islip to Washington, D.C. flight.

When to book flights from Islip to Washington, D.C.

Are you open to changing your travel dates? Check out the ideal times to fly from Islip to Washington, D.C. according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Islip to Washington, D.C. (ISP to WAS) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Islip to Washington, D.C.

Best Price Found

$145

Fastest flight time

1h 15m

Direct flights

Mon, Tue, Wed, Thu, Sat and Sun

Airports in Washington, D.C.

1 airport
The best one-way flight to Washington, D.C. from Islip in the past 72 hours is $145. The best round-trip flight deal from Islip to Washington, D.C. found on momondo in the last 72 hours is $353.
The fastest flight from Islip to Washington, D.C. takes 1h 15m
Direct flights go from Islip to Washington, D.C. on Monday, Tuesday, Wednesday, Thursday, Saturday and Sunday. There are no airlines offering direct flights.
There is 1 airport near Washington, D.C.: Baltimore/Washington (BWI)
Search flight deals

  • How far is Islip Long Island to Washington, D.C. by plane?

    A flight from Islip Long Island to Washington, D.C. will travel around 238.7 mi. A reasonable flight in good conditions will take 1h 15m.

  • When did momondo last update prices for flights from Islip Long Island Airport to Washington, D.C.?

    Prices for flights from Islip Long Island Airport to Washington, D.C. are updated daily.

  • How many operators does momondo search for flights from Islip Long Island Airport to Washington, D.C.?

  • How old do you have to be to fly from Islip Long Island Airport to Washington, D.C.?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Islip Long Island Airport to Washington, D.C..

  • What documentation or ID do you need to fly to Washington, D.C.?

    The required travel and health documents for your Washington, D.C. trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Washington, D.C.. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from Islip to Washington, D.C.?

  • What is the most popular airline from Islip to Washington, D.C.?

Best airlines flying from Islip to Washington, D.C.

Compare and see reviews for airlines that fly from Islip to Washington, D.C. with momondo
Airline
Rating
Free Cancellation
Price
SouthwestPriceFrom $265Free CancellationRating
8.0
4,248 reviews
Search Southwest flights

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

Book flights to Washington, D.C. if you plan to visit one of these locations
Alexandria
Gettysburg
National Harbor
Arlington
Woodbridge
Waldorf
Tysons
Laurel
Colonial Beach
Silver Spring
Fredericksburg
Towson
Rockville
Manassas
Fairfax
Reston
Gaithersburg
Glen Burnie
Linthicum Heights
Springfield

Why use momondo?

Why should I use momondo to find a flight deal from Islip to Washington, D.C.?

It is quick and easy to find Islip to Washington, D.C. flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Washington, D.C. that suits you.

Can I find flights from Islip to Washington, D.C. with flexible booking policies on momondo?

All flight searches from Islip to Washington, D.C. on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Islip to Washington, D.C.?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Islip to Washington, D.C..

I’m not ready to book a flight from Islip to Washington, D.C. right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Washington, D.C., momondo offers a useful price alert feature which will track prices for flights to Washington, D.C. from Islip and alert you when they change.

An easier way to manage your Washington, D.C. trip

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Find better results for your trip to the United States

Fly into one of these airports located in Washington, D.C.

Airports listed have a maximum distance of 22.4 mi from Washington, D.C.
Washington, D.C. Reagan-National Airport
Washington, D.C. Dulles Intl Airport