Trip.com
>
Flights
>
United States
>
Massachusetts
>
Flights to Boston
>
Washington D.C. to Boston flight
>
Dulles International Airport to Portsmouth International Airport flight

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 1,380 BYN and round-trip from 2,683 BYN. Based on Trip.com's latest 7-day flight data.

    • Cheapest
      IAD 18:20
      19h 43m
      1 stop
      PSM 14:03
      Washington D.C. - Boston | Sun, Nov 22 | Allegiant Air
      1,380 BYN 2,171 BYN
      36% off
      36% off
      2,171 BYN 1,380 BYN
    • IAD 17:50
      23h 42m
      1 stop
      PSM 17:32
      Washington D.C. - Boston | Thu, Nov 12 | Allegiant Air
      1,503 BYN 2,171 BYN
      31% off
      31% off
      2,171 BYN 1,503 BYN
    • IAD 20:57
      20h 35m
      1 stop
      PSM 17:32
      Washington D.C. - Boston | Thu, Oct 29 | Allegiant Air
      1,823 BYN 2,171 BYN
      16% off
      16% off
      2,171 BYN 1,823 BYN
    • WAS 13:00
      17h 25m
      1 stop
      BOS 14:00
      Washington D.C. - Boston | Wed, Oct 28 | Normal Airline
      Find more flights
      Find more flights
    • IAD 17:50
      23h 42m
      1 stop
      PSM 17:32
      Washington D.C. - Boston | Wed, Nov 4 | Allegiant Air
      BOS 09:22
      1h 48m
      Direct
      DCA 11:10
      Boston - Washington D.C. | Sat, Nov 7 | Jetblue Airways
      2,683 BYN 4,145 BYN
      35% off
      35% off
      4,145 BYN 2,683 BYN
    • IAD 11:12
      8h 45m
      1 stop
      PSM 19:57
      Washington D.C. - Boston | Fri, Oct 30 | Frontier Airlines
      BOS 06:10
      1h 49m
      Direct
      DCA 07:59
      Boston - Washington D.C. | Sun, Nov 1 | Jetblue Airways
      2,759 BYN 4,145 BYN
      33% off
      33% off
      4,145 BYN 2,759 BYN
    • IAD 17:50
      23h 42m
      1 stop
      PSM 17:32
      Washington D.C. - Boston | Wed, Oct 28 | Allegiant Air
      BOS 06:10
      1h 49m
      Direct
      DCA 07:59
      Boston - Washington D.C. | Sat, Oct 31 | Jetblue Airways
      3,481 BYN 4,145 BYN
      16% off
      16% off
      4,145 BYN 3,481 BYN
    • WAS 13:00
      17h 25m
      1 stop
      BOS 14:00
      Washington D.C. - Boston | Wed, Oct 28 | Normal Airline
      BOS 15:00
      6h
      Direct
      WAS 16:00
      Boston - Washington D.C. | Fri, Oct 30 | Normal Airline
      Find more flights
      Find more flights
    • IAD 18:20
      19h 43m
      1 stop
      PSM 14:03
      Washington D.C. - Boston | Sun, Nov 22 | Allegiant Air
      1,380 BYN 2,171 BYN
      36% off
      36% off
      2,171 BYN 1,380 BYN
    • IAD 20:57
      20h 35m
      1 stop
      PSM 17:32
      Washington D.C. - Boston | Thu, Oct 29 | Allegiant Air
      1,823 BYN 2,171 BYN
      16% off
      16% off
      2,171 BYN 1,823 BYN
    • IAD 17:50
      23h 42m
      1 stop
      PSM 17:32
      Washington D.C. - Boston | Thu, Nov 12 | Allegiant Air
      1,503 BYN 2,171 BYN
      31% off
      31% off
      2,171 BYN 1,503 BYN
    • WAS 13:00
      17h 25m
      1 stop
      BOS 14:00
      Washington D.C. - Boston | Wed, Oct 28 | Normal Airline
      Find more flights
      Find more flights

Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.

About Dulles International Airport and Portsmouth International Airport

Learn about Dulles International Airport (IAD) and Portsmouth International Airport (PSM) — including location, terminals, transportation, and travel tips.

Flight distance 724.13km
Cheapest one-way ticket price 1,380 BYN
Cheapest return ticket price 2,683 BYN

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 1,380 BYN, and round-trip fares start from 2,683 BYN. The current lowest fare is a Allegiant Air flight departing on Sun, Nov 22; 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 1,606 BYN. 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.

Popular Destinations & Recommendations

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

Book with no extra fees

Prices displayed on this page are all-inclusive (incl. taxes, fuel surcharges, Civil Aviation Development Fund, etc.), and all fees are shown before payment. Charges for checked baggage, meals, Wi-Fi, and other optional services may also appear in the flight cards.

Real-time pricing updates

Prices, availability, and travel information on this page have been updated within the last 24 hours, and with many routes refreshed in real time. The more popular the route, the more accurate the data.

Change & Cancellation Policy

Trip.com shows the change and cancellation rules for each ticket during the booking process, including all related fees and conditions. Please refer to the following scenarios:
Voluntary cancellation/change:
To request a change or cancellation, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and flight segment, and submit your request. Please note that additional charges may apply based on the airline’s fare rules.
Cancellation/change due to a flight schedule change:
If your flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For full details of change and cancellation policies, please refer to the customer support pages.