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Dulles International Airport to Portsmouth International Airport flight
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Dulles International Airport to Portsmouth International Airport Flights Info

Cheapest one-way
€187
Allegiant Air Allegiant Air 23h 42m · 1 stop Tue, Nov 17
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Cheapest round-trip
€279
Breeze Airways Breeze Airways 25h 21m · 1 stop Fri, Nov 20 - Mon, Nov 23
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Recommended airlines
Allegiant Air Allegiant AirCheapest· From €187 Jetblue Airways Jetblue AirwaysMost booked

Explore the cheapest one-way and round-trip flights from Dulles International Airport to Portsmouth International Airport over the next 90 days, with one-way fares from €187 and round-trip from €279. Based on Trip.com's latest 7-day flight data.

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    • IAD 6:36 PM
      25h 21m
      1 stop
      PSM 7:57 PM
      Washington D.C. - Boston | Fri, Nov 20 | Breeze Airways
      BOS 6:00 AM
      1h 54m
      Nonstop
      DCA 7:54 AM
      Boston - Washington D.C. | Mon, Nov 23 | American Airlines
      €279 €410
      32% off
      32% off
      €410 €279
    • IAD 9:35 PM
      22h 22m
      1 stop
      PSM 7:57 PM
      Washington D.C. - Boston | Fri, Nov 20 | Frontier Airlines
      BOS 6:00 AM
      1h 54m
      Nonstop
      DCA 7:54 AM
      Boston - Washington D.C. | Mon, Nov 23 | American Airlines
      €332 €410
      19% off
      19% off
      €410 €332
    • WAS 1:00 PM
      17h 25m
      1 stop
      BOS 2:00 PM
      Washington D.C. - Boston | Sun, Nov 15 | Normal Airline
      BOS 3:00 PM
      6h
      Nonstop
      WAS 4:00 PM
      Boston - Washington D.C. | Tue, Nov 17 | Normal Airline
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    • Cheapest
      IAD 5:50 PM
      23h 42m
      1 stop
      PSM 5:32 PM
      Washington D.C. - Boston | Tue, Nov 17 | Allegiant Air
      €187 €231
      19% off
      19% off
      €231 €187
    • WAS 1:00 PM
      17h 25m
      1 stop
      BOS 2:00 PM
      Washington D.C. - Boston | Sun, Nov 15 | Normal Airline
      Find more flights
      Find more flights
    • IAD 5:50 PM
      23h 42m
      1 stop
      PSM 5:32 PM
      Washington D.C. - Boston | Tue, Nov 17 | Allegiant Air
      €187 €231
      19% off
      19% off
      €231 €187
    • WAS 1:00 PM
      17h 25m
      1 stop
      BOS 2:00 PM
      Washington D.C. - Boston | Sun, Nov 15 | Normal Airline
      Find more flights
      Find more flights

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

Which airline offers the cheapest flights from Dulles International Airport to Portsmouth International Airport?

The cheapest airline flying from Dulles International Airport to Portsmouth International Airport is Allegiant Air (from €187) among 5 carriers operating this route. Based on Trip.com's latest 7-day flight data.
American Airlines logo American Airlines Frontier Airlines logo Frontier Airlines Delta Air Lines logo Delta Air Lines United Airlines logo United Airlines Alaska Airlines logo Alaska Airlines
Jetblue Airways logo Jetblue Airways Delta Air Lines logo Delta Air Lines United Airlines logo United Airlines American Airlines logo American Airlines Frontier Airlines logo Frontier Airlines

FAQs for Dulles International Airport to Portsmouth International Airport Flights

  • What are the cheapest flights from Dulles International Airport to Portsmouth International Airport?

    One-way flights from Dulles International Airport to Portsmouth International Airport currently start from €187, and round-trip fares start from €279. The current lowest fare is a Allegiant Air flight departing on Tue, Nov 17; prices may vary depending on availability.
  • Based on Trip.com flight data for departures within the next 30 days with at most one stop, the average one-way price from Dulles International Airport to Portsmouth International Airport is €272. Prices may vary depending on the departure date, airline, and availability.
  • Enter Dulles International Airport and Portsmouth International Airport, select your departure date and number of passengers, then compare flights by price, flight duration, and baggage allowance. Once you've chosen a fare, review the change and refund rules, fill in passenger details, and pay to receive your booking confirmation.

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Note: Prices shown on this page are estimated lowest price and include all taxes and fees found in the last 24 hours.

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Prices displayed in this page are all-inclusive prices (incl. taxes, fuel surcharge, civil aviation development fund, etc) with all fees confirmed before payment. Fees for luggage, meals, WLAN, or other additional services are also included as shown in the flight cards.

Real-time pricing updates

Prices, availability, and travel information on this page were updated within last 24 hours—even in real-time. The more popular the route, the more precise the data.

Change & Cancellation Policy

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Voluntary cancellation/change:
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.
Cancellation/change due to a flight schedule change:
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.