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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 € 34 and round-trip from € 360. Based on Trip.com's latest 7-day flight data.

    • Cheapest
      DMK 15:10
      1h 15m
      Direct
      SNO 16:25
      Bangkok - Sakon Nakhon | Sun, Jan 10 | Thai AirAsia
      € 34 € 82
      59% off
      59% off
      € 82 € 34
    • DMK 06:50
      1h 15m
      Direct
      SNO 08:05
      Bangkok - Sakon Nakhon | Tue, Dec 8 | Thai AirAsia
      € 35 € 82
      56% off
      56% off
      € 82 € 35
    • DMK 16:00
      1h 15m
      Direct
      SNO 17:15
      Bangkok - Sakon Nakhon | Fri, Jan 8 | Nokair Airline
      € 35 € 82
      56% off
      56% off
      € 82 € 35
    • DMK 06:50
      1h 15m
      Direct
      SNO 08:05
      Bangkok - Sakon Nakhon | Thu, Nov 12 | Thai AirAsia
      € 35
      56% off
      € 82 € 35
    • DMK 06:50
      1h 15m
      Direct
      SNO 08:05
      Bangkok - Sakon Nakhon | Wed, Nov 18 | Thai AirAsia
      € 35
      56% off
      € 82 € 35
    • DMK 06:50
      1h 15m
      Direct
      SNO 08:05
      Bangkok - Sakon Nakhon | Wed, Nov 4 | Thai AirAsia
      € 35
      56% off
      € 82 € 35
    • DMK 15:10
      1h 15m
      Direct
      SNO 16:25
      Bangkok - Sakon Nakhon | Fri, Dec 18 | Thai AirAsia
      € 40
      51% off
      € 82 € 40
    • DMK 16:00
      1h 15m
      Direct
      SNO 17:15
      Bangkok - Sakon Nakhon | Wed, Nov 4 | Nokair Airline
      € 43
      48% off
      € 82 € 43
    • DMK 16:00
      1h 15m
      Direct
      SNO 17:15
      Bangkok - Sakon Nakhon | Mon, Nov 9 | Nokair Airline
      € 43
      48% off
      € 82 € 43
    • WAS 13:00
      17h 25m
      1 stop
      BOS 14:00
      Washington D.C. - Boston | Thu, Oct 29 | Normal Airline
      Find more flights
      Find more flights
    • IAD 17:50
      23h 42m
      1 stop
      PSM 17:32
      Washington D.C. - Boston | Thu, Nov 5 | Allegiant Air
      BOS 09:22
      1h 48m
      Direct
      DCA 11:10
      Boston - Washington D.C. | Sun, Nov 8 | Jetblue Airways
      € 360 € 584
      38% off
      38% off
      € 584 € 360
    • IAD 11:12
      8h 45m
      1 stop
      PSM 19:57
      Washington D.C. - Boston | Sat, Oct 31 | Frontier Airlines
      BOS 06:10
      1h 49m
      Direct
      DCA 07:59
      Boston - Washington D.C. | Mon, Nov 2 | Jetblue Airways
      € 370 € 584
      37% off
      37% off
      € 584 € 370
    • IAD 17:50
      23h 42m
      1 stop
      PSM 17:32
      Washington D.C. - Boston | Thu, Oct 29 | Allegiant Air
      BOS 06:10
      1h 49m
      Direct
      DCA 07:59
      Boston - Washington D.C. | Sun, Nov 1 | Jetblue Airways
      € 467 € 584
      20% off
      20% off
      € 584 € 467
    • WAS 13:00
      17h 25m
      1 stop
      BOS 14:00
      Washington D.C. - Boston | Thu, Oct 29 | Normal Airline
      BOS 15:00
      6h
      Direct
      WAS 16:00
      Boston - Washington D.C. | Sat, Oct 31 | Normal Airline
      Find more flights
      Find more flights
    • Cheapest nonstop
      DMK 15:10
      1h 15m
      Direct
      SNO 16:25
      Bangkok - Sakon Nakhon | Sun, Jan 10 | Thai AirAsia
      € 34 € 82
      59% off
      59% off
      € 82 € 34
    • DMK 06:50
      1h 15m
      Direct
      SNO 08:05
      Bangkok - Sakon Nakhon | Tue, Dec 8 | Thai AirAsia
      € 35 € 82
      56% off
      56% off
      € 82 € 35
    • DMK 16:00
      1h 15m
      Direct
      SNO 17:15
      Bangkok - Sakon Nakhon | Fri, Jan 8 | Nokair Airline
      € 35 € 82
      56% off
      56% off
      € 82 € 35
    • DMK 06:50
      1h 15m
      Direct
      SNO 08:05
      Bangkok - Sakon Nakhon | Thu, Nov 12 | Thai AirAsia
      € 35
      56% off
      € 82 € 35
    • DMK 06:50
      1h 15m
      Direct
      SNO 08:05
      Bangkok - Sakon Nakhon | Wed, Nov 18 | Thai AirAsia
      € 35
      56% off
      € 82 € 35
    • DMK 06:50
      1h 15m
      Direct
      SNO 08:05
      Bangkok - Sakon Nakhon | Wed, Nov 4 | Thai AirAsia
      € 35
      56% off
      € 82 € 35
    • DMK 15:10
      1h 15m
      Direct
      SNO 16:25
      Bangkok - Sakon Nakhon | Fri, Dec 18 | Thai AirAsia
      € 40
      51% off
      € 82 € 40
    • DMK 16:00
      1h 15m
      Direct
      SNO 17:15
      Bangkok - Sakon Nakhon | Wed, Nov 4 | Nokair Airline
      € 43
      48% off
      € 82 € 43
    • DMK 16:00
      1h 15m
      Direct
      SNO 17:15
      Bangkok - Sakon Nakhon | Mon, Nov 9 | Nokair Airline
      € 43
      48% off
      € 82 € 43
    • WAS 13:00
      17h 25m
      1 stop
      BOS 14:00
      Washington D.C. - Boston | Thu, Oct 29 | Normal Airline
      Find more flights
      Find more flights
    • DMK 15:10
      1h 15m
      Direct
      SNO 16:25
      Bangkok - Sakon Nakhon | Sun, Jan 10 | Thai AirAsia
      € 34 € 82
      59% off
      59% off
      € 82 € 34
    • DMK 06:50
      1h 15m
      Direct
      SNO 08:05
      Bangkok - Sakon Nakhon | Tue, Dec 8 | Thai AirAsia
      € 35 € 82
      56% off
      56% off
      € 82 € 35
    • DMK 16:00
      1h 15m
      Direct
      SNO 17:15
      Bangkok - Sakon Nakhon | Fri, Jan 8 | Nokair Airline
      € 35 € 82
      56% off
      56% off
      € 82 € 35
    • DMK 06:50
      1h 15m
      Direct
      SNO 08:05
      Bangkok - Sakon Nakhon | Thu, Nov 12 | Thai AirAsia
      € 35
      56% off
      € 82 € 35
    • DMK 06:50
      1h 15m
      Direct
      SNO 08:05
      Bangkok - Sakon Nakhon | Wed, Nov 18 | Thai AirAsia
      € 35
      56% off
      € 82 € 35
    • DMK 06:50
      1h 15m
      Direct
      SNO 08:05
      Bangkok - Sakon Nakhon | Wed, Nov 4 | Thai AirAsia
      € 35
      56% off
      € 82 € 35
    • DMK 15:10
      1h 15m
      Direct
      SNO 16:25
      Bangkok - Sakon Nakhon | Fri, Dec 18 | Thai AirAsia
      € 40
      51% off
      € 82 € 40
    • DMK 16:00
      1h 15m
      Direct
      SNO 17:15
      Bangkok - Sakon Nakhon | Wed, Nov 4 | Nokair Airline
      € 43
      48% off
      € 82 € 43
    • DMK 16:00
      1h 15m
      Direct
      SNO 17:15
      Bangkok - Sakon Nakhon | Mon, Nov 9 | Nokair Airline
      € 43
      48% off
      € 82 € 43
    • WAS 13:00
      17h 25m
      1 stop
      BOS 14:00
      Washington D.C. - Boston | Thu, Oct 29 | 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.

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 € 186) among 1 carriers operating this route. Based on Trip.com's latest 7-day flight data.

Allegiant Air
From € 186

Find more flights and airlines

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 € 34
Cheapest return ticket price € 360

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 € 186, and round-trip fares start from € 360. The current lowest fare is a Allegiant Air flight departing on Mon, Nov 23; 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 € 216. 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 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.