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Cheap flights from Islip, New York to District of Columbia from $118

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 District of Columbia departing on 9/12. 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, New York to District of Columbia

Cheap round-trip flights

Southwest Logo
4:00 pm - 10:00 pmISP-DCA
6h 00m1 stop
Southwest Logo
6:55 am - 1:15 pmDCA-ISP
6h 20m1 stop
$197Southwest
Find Deal
Wed, Aug 27 - Wed, Sep 3
Southwest Logo
2:05 pm - 10:00 pmISP-DCA
7h 55m2 stops
Southwest Logo
6:55 am - 1:15 pmDCA-ISP
6h 20m1 stop
$202Southwest
Find Deal
Wed, Aug 27 - Wed, Sep 3
Southwest Logo
2:05 pm - 10:00 pmISP-DCA
7h 55m2 stops
Southwest Logo
6:55 am - 3:15 pmDCA-ISP
8h 20m2 stops
$207Southwest
Find Deal
Wed, Aug 27 - Wed, Sep 3
Southwest Logo
6:05 am - 5:00 pmISP-DCA
10h 55m1 stop
Southwest Logo
6:55 am - 3:05 pmDCA-ISP
8h 10m2 stops
$208Southwest
Find Deal
Sat, Sep 6 - Sat, Sep 13
Southwest Logo
4:00 pm - 10:00 pmISP-DCA
6h 00m1 stop
Southwest Logo
12:50 pm - 9:05 pmDCA-ISP
8h 15m1 stop
$262Southwest
Find Deal
Wed, Aug 27 - Tue, Sep 2
Southwest Logo
4:00 pm - 10:00 pmISP-DCA
6h 00m1 stop
Southwest Logo
6:55 am - 3:15 pmDCA-ISP
8h 20m2 stops
$267Southwest
Find Deal
Wed, Aug 27 - Tue, Sep 2
Southwest Logo
2:05 pm - 10:00 pmISP-DCA
7h 55m2 stops
Southwest Logo
6:55 am - 3:15 pmDCA-ISP
8h 20m2 stops
$272Southwest
Find Deal
Wed, Aug 27 - Tue, Sep 2
JetBlue Logo
11:35 am - 8:54 pmISP-DCA
9h 19m1 stop
JetBlue Logo
4:00 pm - 3:23 pmDCA-ISP
23h 23m1 stop
$337JetBlue
Find Deal
Sat, Sep 6 - Mon, Sep 8
Southwest Logo
6:25 am - 4:10 pmISP-DCA
9h 45m1 stop
Southwest Logo
6:55 am - 5:00 pmDCA-ISP
10h 05m2 stops
$358Southwest
Find Deal
Thu, Sep 18 - Sun, Sep 21
Logo
7:30 am - 3:22 pmISP-DCA
7h 52m2 stops
Logo
6:00 am - 8:01 pmDCA-ISP
14h 01m2 stops
$725
Find Deal
Sat, Sep 6 - Sat, Sep 13

Southwest flights from Islip, New York to District of Columbia

Our best Southwest deals on Islip, New York to District of Columbia flight tickets
Southwest
Aug 27
ISP4:00 pmIslip Long Island
6h 00m
1 stop
DCA10:00 pmWashington, D.C. Reagan-National
Sep 3
DCA6:55 amWashington, D.C. Reagan-National
6h 20m
1 stop
ISP1:15 pmIslip Long Island
$197
Find similar
Southwest
Aug 27
ISP2:05 pmIslip Long Island
7h 55m
2 stops
DCA10:00 pmWashington, D.C. Reagan-National
Sep 3
DCA6:55 amWashington, D.C. Reagan-National
6h 20m
1 stop
ISP1:15 pmIslip Long Island
$202
Find similar
Southwest
Aug 27
ISP2:05 pmIslip Long Island
7h 55m
2 stops
DCA10:00 pmWashington, D.C. Reagan-National
Sep 3
DCA6:55 amWashington, D.C. Reagan-National
8h 20m
2 stops
ISP3:15 pmIslip Long Island
$207
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Islip, New York to District of Columbia 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 July 31, 2025.
Use the filters below to find and compare flights from Islip, New York to District of Columbia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Wed 8/27

4:00 pm-10:00 pm

1 stop6h 00m

Washington, D.C. Reagan-National

Wed 9/3

6:55 am-1:15 pm

1 stop6h 20m

$197

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Wed 8/27

2:05 pm-10:00 pm

2 stops7h 55m

Washington, D.C. Reagan-National

Wed 9/3

6:55 am-1:15 pm

1 stop6h 20m

$202

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Wed 8/27

2:05 pm-10:00 pm

2 stops7h 55m

Washington, D.C. Reagan-National

Wed 9/3

6:55 am-3:15 pm

2 stops8h 20m

$207

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Sat 9/6

6:05 am-5:00 pm

1 stop10h 55m

Washington, D.C. Reagan-National

Sat 9/13

6:55 am-3:05 pm

2 stops8h 10m

$208

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Wed 8/27

4:00 pm-10:00 pm

1 stop6h 00m

Washington, D.C. Reagan-National

Tue 9/2

12:50 pm-9:05 pm

1 stop8h 15m

$262

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Wed 8/27

4:00 pm-10:00 pm

1 stop6h 00m

Washington, D.C. Reagan-National

Tue 9/2

6:55 am-3:15 pm

2 stops8h 20m

$267

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Wed 8/27

2:05 pm-10:00 pm

2 stops7h 55m

Washington, D.C. Reagan-National

Tue 9/2

6:55 am-3:15 pm

2 stops8h 20m

$272

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Sat 9/6

11:35 am-8:54 pm

1 stop9h 19m

Washington, D.C. Reagan-National

Mon 9/8

4:00 pm-3:23 pm

1 stop23h 23m

$337

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Thu 9/18

6:25 am-4:10 pm

1 stop9h 45m

Washington, D.C. Reagan-National

Sun 9/21

6:55 am-5:00 pm

2 stops10h 05m

$358

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Sat 9/6

7:30 am-3:22 pm

2 stops7h 52m

Washington, D.C. Reagan-National

Sat 9/13

6:00 am-8:01 pm

2 stops14h 01m

$725

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 District of Columbia from

How to get the cheapest flight ticket from Islip, New York to District of Columbia

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 District of Columbia?

In general, May is the cheapest month to fly from Islip, New York to District of Columbia. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $296. If you don’t want to visit District of Columbia in May, then you should wait until September to fly from Islip, New York, when ticket prices are also cheap, with an average price of $319.

What is the cheapest day to depart on your flight to District of Columbia?

The cheapest day to depart on your flight to District of Columbia is on a Friday when prices can be found for as low as $383. This is often the case because there is less demand to fly during this day of the week. On the other hand, Monday is the most expensive day to depart from Islip, New York because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $537.

What is the cheapest time of day to depart on your flight to District of Columbia?

Flying to District of Columbia from Islip, New York in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $335 when looking at flights departing in the afternoon. Flights to District of Columbia are more costly in the morning, with an average ticket price of $447. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest Islip Long Island to District of Columbia flight route?

Fly from Islip Long Island to Baltimore/Washington for the best Islip Long Island - District of Columbia flight prices

What cabin class options are available on Islip Long Island to District of Columbia flights?

There are 1 cabin classes available to choose from on Islip Long Island to District of Columbia flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Cheap Islip, New York to District of Columbia flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Islip, New York to District of Columbia

Best Price Found

$118

Fastest flight time

5h 40m

Direct flights

None

Airports in District of Columbia

1 airport
The best one-way flight to District of Columbia from Islip, New York in the past 72 hours is $118. The best round-trip flight deal from Islip, New York to District of Columbia found on momondo in the last 72 hours is $197.
The fastest flight from Islip, New York to District of Columbia takes 5h 40m
There are no direct flights from Islip, New York to District of Columbia. Popular non-direct route for this connection is Islip Long Island Airport - Washington, D.C. Reagan-National Airport.
There is 1 airport near District of Columbia: Washington, D.C. Reagan-National (DCA)
Search flight deals

  • When did momondo last update prices for flights from Islip Long Island Airport to District of Columbia?

    Prices for flights from Islip Long Island Airport to District of Columbia were last updated today.

  • How old do you have to be to fly from Islip Long Island Airport to District of Columbia?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Islip Long Island Airport to District of Columbia.

  • What documentation or ID do you need to fly to District of Columbia?

    The travel and health documents required for your trip to District of Columbia can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at District of Columbia. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Islip, New York to District of Columbia

Compare and see reviews for airlines that fly from Islip, New York to District of Columbia with momondo
Airline
Rating
Free Cancellation
Price
SouthwestPriceFrom $273Free CancellationRating
8.0
4,246 reviews
Search Southwest flights

Why use momondo?

Why should I use momondo to find a flight deal from Islip to District of Columbia?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Islip to District of Columbia for you.

Can I find flights from Islip to District of Columbia with flexible booking policies on momondo?

All flight searches from Islip to District of Columbia on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Islip to District of Columbia?

momondo provides multiple filters to help you find the best flight to District of Columbia from Islip. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Islip to District of Columbia right now. Can momondo alert me if prices change?

Price alerts on flights to District of Columbia from Islip are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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