Trip.com
>
Flights
>
Flights to United States
>
Flights to New York State
>
Flights to Islip
>
Flights from Manassas to Islip

No flights were found from Manassas to Islip. Instead, check out the deals below for nearby routes from Washington D.C. to Islip.

      • IAD 09:26
        14h 33m
        1 stop
        ISP 23:59
        Washington D.C. - Islip | Fri, Dec 12 | Frontier Airlines
        ISP 06:15
        16h 45m
        1 stop
        DCA 23:00
        Islip - Washington D.C. | Sun, Dec 14 | Frontier Airlines
        €241 €757
        68% OFF
        68% OFF
        €757 €241
      • DCA 18:00
        15h 13m
        1 stop
        ISP 09:13
        Washington D.C. - Islip | Sun, Dec 14 | Jetblue Airways
        ISP 12:20
        8h 51m
        1 stop
        DCA 21:11
        Islip - Washington D.C. | Thu, Dec 18 | Frontier Airlines
        €258 €757
        66% OFF
        66% OFF
        €757 €258
      • DCA 15:32
        17h 41m
        1 stop
        ISP 09:13
        Washington D.C. - Islip | Sun, Dec 14 | American Airlines
        ISP 12:20
        11h 9m
        1 stop
        DCA 23:29
        Islip - Washington D.C. | Thu, Dec 18 | Frontier Airlines
        €260 €757
        66% OFF
        66% OFF
        €757 €260
      • DCA 08:19
        14h 25m
        1 stop
        ISP 22:44
        Washington D.C. - Islip | Wed, Dec 17 | American Airlines
        ISP 18:40
        26h 50m
        1 stop
        DCA 21:30
        Islip - Washington D.C. | Sat, Dec 20 | Frontier Airlines
        €279
        63% OFF
        €757 €279
      • DCA 11:00
        11h 44m
        1 stop
        ISP 22:44
        Washington D.C. - Islip | Wed, Dec 17 | Jetblue Airways
        ISP 18:40
        16h 32m
        1 stop
        DCA 11:12
        Islip - Washington D.C. | Sat, Dec 20 | Frontier Airlines
        €285
        62% OFF
        €757 €285
      • IAD 09:00
        14h 59m
        1 stop
        ISP 23:59
        Washington D.C. - Islip | Sun, Dec 14 | United Airlines
        ISP 05:45
        10h 29m
        1 stop
        IAD 16:14
        Islip - Washington D.C. | Thu, Dec 18 | Frontier Airlines
        €344
        55% OFF
        €757 €344
      • DCA 10:45
        24h 50m
        1 stop
        ISP 11:35
        Washington D.C. - Islip | Fri, Jan 16 | Jetblue Airways
        ISP 12:25
        10h 6m
        1 stop
        DCA 22:31
        Islip - Washington D.C. | Mon, Jan 19 | Jetblue Airways
        €415
        45% OFF
        €757 €415
      • DCA 18:15
        18h 54m
        1 stop
        ISP 13:09
        Washington D.C. - Islip | Sun, Dec 28 | Jetblue Airways
        ISP 20:35
        24h 36m
        1 stop
        DCA 21:11
        Islip - Washington D.C. | Sun, Jan 4 | Frontier Airlines
        €468
        38% OFF
        €757 €468
      • IAD 12:42
        10h 2m
        1 stop
        ISP 22:44
        Washington D.C. - Islip | Wed, Dec 17 | United Airlines
        ISP 18:40
        23h 45m
        1 stop
        IAD 18:25
        Islip - Washington D.C. | Sat, Dec 20 | Frontier Airlines
        €475
        37% OFF
        €757 €475
      • DCA 18:15
        15h 46m
        1 stop
        ISP 10:01
        Washington D.C. - Islip | Mon, Dec 29 | Jetblue Airways
        ISP 07:30
        8h 19m
        1 stop
        DCA 15:49
        Islip - Washington D.C. | Fri, Jan 2 | Cape Air
        €530
        30% OFF
        €757 €530
      • WAS 13:00
        17h 25m
        1 stop
        ISP Invalid Date
        Washington D.C. - Islip | Thu, Dec 11 | Normal Airline
        ISP 15:00
        6h
        Nonstop
        WAS 16:00
        Islip - Washington D.C. | Sat, Dec 13 | Normal Airline
        Find More Flights
        Find More Flights

Displayed flight fares from Manassas to Islip are based on average prices across airlines for the next 3 months, according to the latest Trip.com database.

Flight Info | Manassas to Islip

Check out flight details for routes from Washington D.C. to Islip—including distance, duration, and the best value month—to help plan your trip from Manassas to Islip.

Cheapest one-way flight price€84
Cheapest return ticket price€241
Off-season for travelSeptember
Peak season for travelJuly
Flight distance397.38 km

When is the cheapest time to fly from Manassas to Islip?

Analyze price trends for flights from Washington D.C. to Islip—including distance, duration, and the most cost-effective month—to plan your journey from Manassas to Islip.

Cheapest flights
From price
Search
  • 714
  • 1421
  • 2128

  • Jan

    284
  • 411
  • 1118
  • 1825

  • Feb

    251
  • 18
  • 815
  • 1522

  • Mar

    221
Displayed fare trends are based on Trip.com's aggregated average of the lowest flight prices from Manassas to Islip, calculated over the upcoming 10 weeks.

Frequently Asked Questions

FAQs for flights from Manassas to Islip when there’s no local airport. Departures and arrivals are through Washington D.C. to Islip.

  • What are the cheapest flights from Washington D.C. to Islip (WAS-ISP)?

    Based on Trip.com data, Jetblue Airways offers one-way fares as low as €84 on Cheapest nonstop routes (e.g. DCA to ISP on Tue, Dec 16), while Frontier Airlines offers Cheapest nonstop round-trips from €241 departing on Fri, Dec 12 and returning on Sun, Dec 14.
  • By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Washington D.C. to Islip is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.
  • To find best deals on flights from Washington D.C. to Islip, you can use various tools on Trip.com:
    · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Tue, Dec 16, with one-way flights priced at just €84.
    · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Jetblue Airways.
    · Set up price alerts to easily monitor ticket prices without having to check every day.
    · Check Trip.com flight deals and promo codes frequently.
    · Avoid peak season unless you book very early. It seems the peak season for Islip travel is around July.
    · Get exclusive promo codes for Trip.com app users.
  • The cheapest months to fly from Washington D.C. to Islip is September, when demand for travel is lower.
  • After crunching the numbers on our December flight calendar, it's currently cheapest to fly from Washington D.C. to Islip on December 12, 2025 with Frontier Airlines, with prices starting at €240.
  • The time difference between Islip and Washington D.C. is 0h.
  • Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.

Explore More Popular Flights