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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 US$307 and round-trip from US$403. Based on Trip.com's latest 7-day flight data.

    • Cheapest
      IAD 20:57
      20h 35m
      1 stop
      PSM 17:32
      Washington D.C. - Boston | Mon, Nov 2 | Allegiant Air
      US$307 US$421
      27% off
      27% off
      US$421 US$307
    • WAS 13:00
      17h 25m
      1 stop
      BOS 14:00
      Washington D.C. - Boston | Fri, Oct 30 | Normal Airline
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    • 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
      US$403 US$568
      28% off
      28% off
      US$568 US$403
    • 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
      US$414 US$568
      27% off
      27% off
      US$568 US$414
    • WAS 13:00
      17h 25m
      1 stop
      BOS 14:00
      Washington D.C. - Boston | Fri, Oct 30 | Normal Airline
      BOS 15:00
      6h
      Direct
      WAS 16:00
      Boston - Washington D.C. | Sun, Nov 1 | Normal Airline
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    • IAD 20:57
      20h 35m
      1 stop
      PSM 17:32
      Washington D.C. - Boston | Mon, Nov 2 | Allegiant Air
      US$307 US$421
      27% off
      27% off
      US$421 US$307
    • WAS 13:00
      17h 25m
      1 stop
      BOS 14:00
      Washington D.C. - Boston | Fri, Oct 30 | 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 US$272) among 1 carriers operating this route. Based on Trip.com's latest 7-day flight data.

Allegiant Air
From US$272

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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 US$307
Cheapest return ticket price US$403

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 US$307, and round-trip fares start from US$403. The current lowest fare is a Allegiant Air flight departing on Mon, Nov 2; 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 US$241. 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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