Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Islip, New York to Washington, D.C. from $78

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, New York to Washington, D.C. departing on 9/3. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Islip, New York to Washington, D.C.

Cheap round-trip flights

Frontier Logo
5:12 pm - 7:29 amISP-BWI
14h 17m1 stop
Frontier Logo
4:09 pm - 10:40 amBWI-ISP
18h 31m1 stop
$163Frontier
Find Deal
Thu, Sep 4 - Mon, Sep 8
Southwest Logo
6:05 am - 7:20 amISP-BWI
1h 15mnonstop
Southwest Logo
10:50 am - 12:00 pmBWI-ISP
1h 10mnonstop
$166Southwest
Find Deal
Tue, Sep 9 - Mon, Sep 15
Frontier Logo
5:18 pm - 8:05 pmISP-BWI
26h 47m1 stop
Frontier Logo
4:24 pm - 10:55 amBWI-ISP
18h 31m1 stop
$168Frontier
Find Deal
Sat, Sep 27 - Wed, Oct 1
Frontier Logo
8:00 am - 2:08 pmISP-BWI
6h 08m1 stop
Frontier Logo
4:24 pm - 10:40 amBWI-ISP
18h 16m1 stop
$170Frontier
Find Deal
Wed, Sep 3 - Wed, Sep 10
Southwest Logo
12:30 pm - 1:50 pmISP-BWI
1h 20mnonstop
Southwest Logo
10:45 am - 11:55 amBWI-ISP
1h 10mnonstop
$175Southwest
Find Deal
Wed, Sep 3 - Wed, Sep 10
Frontier Logo
5:05 pm - 3:29 pmISP-BWI
22h 24m1 stop
Frontier Logo
9:27 pm - 10:40 amBWI-ISP
13h 13m1 stop
$176Frontier
Find Deal
Fri, Sep 5 - Sun, Sep 7
Southwest Logo
6:00 am - 7:15 amISP-BWI
1h 15mnonstop
Southwest Logo
9:45 pm - 10:55 pmBWI-ISP
1h 10mnonstop
$177Southwest
Find Deal
Thu, Sep 4 - Mon, Sep 8
Frontier Logo
11:25 am - 3:29 pmISP-BWI
28h 04m1 stop
Frontier Logo
4:09 pm - 10:40 amBWI-ISP
18h 31m1 stop
$179Frontier
Find Deal
Tue, Sep 9 - Mon, Sep 15
JetBlue Logo
11:35 am - 6:06 pmISP-DCA
6h 31m1 stop
JetBlue Logo
6:40 am - 1:02 pmDCA-ISP
6h 22m1 stop
$336JetBlue
Find Deal
Sat, Oct 25 - Sun, Oct 26
JetBlue Logo
4:19 pm - 1:28 pmISP-DCA
21h 09m1 stop
JetBlue Logo
4:00 pm - 3:23 pmDCA-ISP
23h 23m1 stop
$345JetBlue
Find Deal
Mon, Sep 15 - Wed, Sep 17

Frontier flights from Islip, New York to Washington, D.C.

Our best Frontier deals on Islip, New York to Washington, D.C. flight tickets
Frontier
Sep 4
ISP5:12 pmIslip Long Island
14h 17m
1 stop
BWI7:29 amBaltimore/Washington
Sep 8
BWI4:09 pmBaltimore/Washington
18h 31m
1 stop
ISP10:40 amIslip Long Island
$163
Find similar
Frontier
Sep 27
ISP5:18 pmIslip Long Island
26h 47m
1 stop
BWI8:05 pmBaltimore/Washington
Oct 1
BWI4:24 pmBaltimore/Washington
18h 31m
1 stop
ISP10:55 amIslip Long Island
$168
Find similar
Frontier
Sep 3
ISP8:00 amIslip Long Island
6h 08m
1 stop
BWI2:08 pmBaltimore/Washington
Sep 10
BWI4:24 pmBaltimore/Washington
18h 16m
1 stop
ISP10:40 amIslip Long Island
$170
Find similar

Southwest flights from Islip, New York to Washington, D.C.

Our best Southwest deals on Islip, New York to Washington, D.C. flight tickets
Southwest
Sep 9
ISP6:05 amIslip Long Island
1h 15m
BWI7:20 amBaltimore/Washington
Sep 15
BWI10:50 amBaltimore/Washington
1h 10m
ISP12:00 pmIslip Long Island
$166
Find similar
Southwest
Sep 3
ISP12:30 pmIslip Long Island
1h 20m
BWI1:50 pmBaltimore/Washington
Sep 10
BWI10:45 amBaltimore/Washington
1h 10m
ISP11:55 amIslip Long Island
$175
Find similar
Southwest
Sep 4
ISP6:00 amIslip Long Island
1h 15m
BWI7:15 amBaltimore/Washington
Sep 8
BWI9:45 pmBaltimore/Washington
1h 10m
ISP10:55 pmIslip Long Island
$177
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Islip, New York 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 August 16, 2025.
Use the filters below to find and compare flights from Islip, New York to Washington, D.C. that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

Thu 9/4

5:12 pm-7:29 am

1 stop14h 17m

Baltimore/Washington

Mon 9/8

4:09 pm-10:40 am

1 stop18h 31m

$163

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

Tue 9/9

6:05 am-7:20 am

Nonstop1h 15m

Baltimore/Washington

Mon 9/15

10:50 am-12:00 pm

Nonstop1h 10m

$166

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

Sat 9/27

5:18 pm-8:05 pm

1 stop26h 47m

Baltimore/Washington

Wed 10/1

4:24 pm-10:55 am

1 stop18h 31m

$168

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

Wed 9/3

8:00 am-2:08 pm

1 stop6h 08m

Baltimore/Washington

Wed 9/10

4:24 pm-10:40 am

1 stop18h 16m

$170

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

Wed 9/3

12:30 pm-1:50 pm

Nonstop1h 20m

Baltimore/Washington

Wed 9/10

10:45 am-11:55 am

Nonstop1h 10m

$175

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

Fri 9/5

5:05 pm-3:29 pm

1 stop22h 24m

Baltimore/Washington

Sun 9/7

9:27 pm-10:40 am

1 stop13h 13m

$176

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

Thu 9/4

6:00 am-7:15 am

Nonstop1h 15m

Baltimore/Washington

Mon 9/8

9:45 pm-10:55 pm

Nonstop1h 10m

$177

IslipBaltimore

ISP - BWI

ISPBWI

Islip Long Island

Tue 9/9

11:25 am-3:29 pm

1 stop28h 04m

Baltimore/Washington

Mon 9/15

4:09 pm-10:40 am

1 stop18h 31m

$179

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Sat 10/25

11:35 am-6:06 pm

1 stop6h 31m

Washington, D.C. Reagan-National

Sun 10/26

6:40 am-1:02 pm

1 stop6h 22m

$336

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Mon 9/15

4:19 pm-1:28 pm

1 stop21h 09m

Washington, D.C. Reagan-National

Wed 9/17

4:00 pm-3:23 pm

1 stop23h 23m

$345

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

See travel insights to Washington, D.C. from

How to get the cheapest flight ticket from Islip, New York 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, New York, with most prices found around $296. If you’re not able to fly to Washington, D.C. in May, then September is your next best option. Flight prices from Islip, New York to Washington, D.C. during September average around $319.

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, New York is on a Friday. momondo users have found tickets for Friday departures for as low as $352. 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, New York to Washington, D.C. for around $468.

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, New York to Washington, D.C. when you can find flight prices for as low as $381. 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 $468. 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 are 1 cabin classes 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, New York to Washington, D.C. flights?

No. A direct flight is the cheapest option for a flight between Islip, New York to Washington, D.C..

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

Are you open to changing your travel dates? Check out the ideal times to fly from Islip, New York 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, New York 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, New York to Washington, D.C.

Best Price Found

$78

Fastest flight time

1h 15m

Direct flights

Every day

Airports in Washington, D.C.

2 airports
The best one-way flight to Washington, D.C. from Islip, New York in the past 72 hours is $78. The best round-trip flight deal from Islip, New York to Washington, D.C. found on momondo in the last 72 hours is $163.
The fastest flight from Islip, New York to Washington, D.C. takes 1h 15m
Direct flights go from Islip, New York to Washington, D.C. every day.
There are 2 airports near Washington, D.C.: Washington, D.C. Reagan-National (DCA), 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, New York to Washington, D.C.?

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

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

Compare and see reviews for airlines that fly from Islip, New York to Washington, D.C. with momondo
Airline
Rating
Free Cancellation
Price
SouthwestPriceFrom $273Free CancellationRating
8.0
4,246 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
Arlington
National Harbor
Woodbridge
Tysons
Laurel
Silver Spring
Waldorf
Fredericksburg
Colonial Beach
Manassas
Rockville
Towson
Gaithersburg
Fairfax
Reston
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

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Thu 8/21
Thu 8/28
By creating a price alert you accept our terms of use and privacy policy.

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