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Cheap flights from Islip, New York to District of Columbia from $150

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 1/16. 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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0 bags

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Find the cheapest flights from Islip, New York to District of Columbia

Cheap round-trip flights

Enter your travel dates to find the best prices.
Southwest Logo
9:15 am - 6:00 pm
ISP
-
DCA
8h 45m2 stops
Southwest Logo
7:30 am - 1:30 pm
DCA
-
ISP
6h 00m1 stop
$377Southwest
Tue, Jan 13 - Thu, Jan 15
Southwest Logo
9:15 am - 6:00 pm
ISP
-
DCA
8h 45m2 stops
Southwest Logo
7:55 am - 2:35 pm
DCA
-
ISP
6h 40m1 stop
$387Southwest
Sun, Jan 18 - Tue, Jan 20
Southwest Logo
11:55 am - 8:45 pm
ISP
-
DCA
8h 50m1 stop
Southwest Logo
7:30 am - 1:30 pm
DCA
-
ISP
6h 00m1 stop
$408Southwest
Mon, Feb 16 - Thu, Feb 19
Southwest Logo
9:15 am - 3:45 pm
ISP
-
DCA
6h 30m1 stop
Southwest Logo
7:30 am - 1:30 pm
DCA
-
ISP
6h 00m1 stop
$437Southwest
Tue, Jan 13 - Thu, Jan 15
Southwest Logo
11:55 am - 8:45 pm
ISP
-
DCA
8h 50m1 stop
Southwest Logo
7:30 am - 4:45 pm
DCA
-
ISP
9h 15m1 stop
$499Southwest
Fri, Feb 13 - Mon, Feb 16
Southwest Logo
11:55 am - 10:35 pm
ISP
-
DCA
10h 40m2 stops
Southwest Logo
7:30 am - 4:45 pm
DCA
-
ISP
9h 15m1 stop
$504Southwest
Fri, Feb 13 - Mon, Feb 16
Southwest Logo
11:55 am - 10:35 pm
ISP
-
DCA
10h 40m2 stops
Southwest Logo
12:45 pm - 11:10 pm
DCA
-
ISP
10h 25m2 stops
$509Southwest
Fri, Feb 13 - Mon, Feb 16
Southwest Logo
1:35 pm - 8:45 pm
ISP
-
DCA
7h 10m1 stop
Southwest Logo
7:55 am - 2:35 pm
DCA
-
ISP
6h 40m1 stop
$519Southwest
Sun, Jan 4 - Tue, Jan 6
Southwest Logo
2:10 pm - 10:55 pm
ISP
-
DCA
8h 45m2 stops
Southwest Logo
7:55 am - 2:35 pm
DCA
-
ISP
6h 40m1 stop
$524Southwest
Mon, Jan 19 - Tue, Jan 20
Southwest Logo
6:20 am - 4:00 pm
ISP
-
DCA
9h 40m1 stop
Southwest Logo
7:55 am - 2:35 pm
DCA
-
ISP
6h 40m1 stop
$602Southwest
Mon, Jan 19 - Tue, Jan 20

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
Jan 7
ISP9:15 amIslip Long Island
6h 30m
1 stop
DCA3:45 pmWashington, D.C. Reagan-National
Jan 15
DCA7:30 amWashington, D.C. Reagan-National
6h 00m
1 stop
ISP1:30 pmIslip Long Island
$367
Find similar
Southwest
Jan 7
ISP9:15 amIslip Long Island
8h 45m
2 stops
DCA6:00 pmWashington, D.C. Reagan-National
Jan 15
DCA7:30 amWashington, D.C. Reagan-National
6h 00m
1 stop
ISP1:30 pmIslip Long Island
$372
Find similar
Southwest
Jan 13
ISP9:15 amIslip Long Island
8h 45m
2 stops
DCA6:00 pmWashington, D.C. Reagan-National
Jan 15
DCA7:30 amWashington, D.C. Reagan-National
6h 00m
1 stop
ISP1:30 pmIslip Long Island
$377
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 December 18, 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

Tue 1/13

9:15 am-6:00 pm

2 stops8h 45m

Washington, D.C. Reagan-National

Thu 1/15

7:30 am-1:30 pm

1 stop6h 00m

$377

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Sun 1/18

9:15 am-6:00 pm

2 stops8h 45m

Washington, D.C. Reagan-National

Tue 1/20

7:55 am-2:35 pm

1 stop6h 40m

$387

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Mon 2/16

11:55 am-8:45 pm

1 stop8h 50m

Washington, D.C. Reagan-National

Thu 2/19

7:30 am-1:30 pm

1 stop6h 00m

$408

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Tue 1/13

9:15 am-3:45 pm

1 stop6h 30m

Washington, D.C. Reagan-National

Thu 1/15

7:30 am-1:30 pm

1 stop6h 00m

$437

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Fri 2/13

11:55 am-8:45 pm

1 stop8h 50m

Washington, D.C. Reagan-National

Mon 2/16

7:30 am-4:45 pm

1 stop9h 15m

$499

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Fri 2/13

11:55 am-10:35 pm

2 stops10h 40m

Washington, D.C. Reagan-National

Mon 2/16

7:30 am-4:45 pm

1 stop9h 15m

$504

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Fri 2/13

11:55 am-10:35 pm

2 stops10h 40m

Washington, D.C. Reagan-National

Mon 2/16

12:45 pm-11:10 pm

2 stops10h 25m

$509

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Sun 1/4

1:35 pm-8:45 pm

1 stop7h 10m

Washington, D.C. Reagan-National

Tue 1/6

7:55 am-2:35 pm

1 stop6h 40m

$519

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Mon 1/19

2:10 pm-10:55 pm

2 stops8h 45m

Washington, D.C. Reagan-National

Tue 1/20

7:55 am-2:35 pm

1 stop6h 40m

$524

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Mon 1/19

6:20 am-4:00 pm

1 stop9h 40m

Washington, D.C. Reagan-National

Tue 1/20

7:55 am-2:35 pm

1 stop6h 40m

$602

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 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 is only 1 cabin class 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

Fastest flight time

8h 45m

Direct flights

None
The fastest flight from Islip, New York to District of Columbia takes 8h 45m
There are no direct flights from Islip, New York to District of Columbia. There are no popular flight routes from Islip, New York to District of Columbia.
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 $245Free CancellationRating
7.9
4,250 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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