IAD

£430 Find Cheap Flights from Portsmouth to Washington Dulles Airport

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Portsmouth to Dulles Intl departing on 23/11. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Washington, D.C. Dulles Intl Airport

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Everything you should know

Cheapest return fare
£507
British Airways
Wed 8/7Fri 24/7
SOU - IAD • 1 stop
Cheapest one-way flight
£430
British Airways
Mon 23/11
SOU - IAD • 1 stop
Direct flights
Every day
You can fly direct with ANA, Aer Lingus, and others. Average duration is 0
Direct flights
Direct flights
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+1
Direct flights
Direct flights
+1
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We hope you love your trip to Dulles Intl!
Flight Deals
Useful Info
Flight Deals

Cheap Flights from Portsmouth to Dulles Intl

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from Portsmouth to Dulles Intl that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent return flight deals from Portsmouth to Dulles Intl

Wed, 8 Jul - Fri, 24 Jul
British Airways Logo
09:20 - 15:45
SOU
-
IAD
11h 25m
1 stop
British Airways Logo
17:15 - 16:50
IAD
-
SOU
18h 35m
1 stop
£507British Airways
Thu, 29 Oct - Thu, 5 Nov
British Airways Logo
09:20 - 16:35
SOU
-
IAD
11h 15m
1 stop
British Airways Logo
17:05 - 08:40
IAD
-
SOU
10h 35m
1 stop
£509British Airways
Thu, 29 Oct - Thu, 5 Nov
British Airways Logo
09:20 - 20:30
SOU
-
IAD
15h 10m
1 stop
British Airways Logo
17:05 - 08:40
IAD
-
SOU
10h 35m
1 stop
£510British Airways
Thu, 29 Oct - Thu, 5 Nov
British Airways Logo
09:20 - 20:30
SOU
-
IAD
15h 10m
1 stop
British Airways Logo
17:05 - 08:40
IAD
-
SOU
10h 35m
1 stop
£510British Airways
Thu, 29 Oct - Thu, 5 Nov
British Airways Logo
09:20 - 16:35
SOU
-
IAD
11h 15m
1 stop
British Airways Logo
17:05 - 16:35
IAD
-
SOU
18h 30m
1 stop
£512British Airways
Sun, 5 Jul - Sun, 12 Jul
British Airways Logo
20:00 - 19:15
SOU
-
IAD
28h 15m
1 stop
British Airways Logo
17:15 - 16:50
IAD
-
SOU
18h 35m
1 stop
£517British Airways
Fri, 23 Oct - Sun, 1 Nov
British Airways Logo
20:00 - 15:45
SOU
-
IAD
24h 45m
1 stop
British Airways Logo
21:00 - 19:30
IAD
-
SOU
17h 30m
1 stop
£522British Airways
Wed, 5 Aug - Wed, 12 Aug
British Airways Logo
09:20 - 19:25
SOU
-
IAD
15h 05m
1 stop
British Airways Logo
17:15 - 08:40
IAD
-
SOU
10h 25m
1 stop
£523British Airways
Sun, 23 Aug - Mon, 31 Aug
British Airways Logo
20:00 - 19:25
SOU
-
IAD
28h 25m
1 stop
British Airways Logo
17:15 - 08:40
IAD
-
SOU
10h 25m
1 stop
£529British Airways
Fri, 21 Aug - Thu, 3 Sep
British Airways Logo
09:20 - 19:25
SOU
-
IAD
15h 05m
1 stop
British Airways Logo
17:15 - 08:40
IAD
-
SOU
10h 25m
1 stop
£544British Airways
Useful Info

Good to know - Cheap tickets from Portsmouth to Washington Dulles Airport

Low seasonJanuary
Best time to beat the crowds but there is an average 2% increase in price.
Most popular time to fly (17% more expensive on average)

When to book flights from Portsmouth to Dulles Intl

Are your dates flexible? Find out the best times to travel from Portsmouth to Dulles Intl based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated return price

FAQs for booking Portsmouth to Washington Dulles Airport flights

  • How does KAYAK find such low prices on flights from Portsmouth to Washington Dulles Airport?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Portsmouth to Washington Dulles Airport.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Portsmouth to Washington Dulles Airport?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Washington Dulles Airport from Portsmouth is likely to change within 7 days, so travellers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Portsmouth to Washington Dulles Airport?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly to Washington Dulles Airport with an airline and back to Portsmouth with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Portsmouth to Washington Dulles Airport?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Washington Dulles Airport from Portsmouth up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Portsmouth to Dulles Intl

 
Need help choosing which airline to fly with from Portsmouth to Dulles Intl? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.3
Aer LingusOverall score based on 1603 reviews
8.1Crew
7.0Entertainment
6.7Food
7.4Boarding
7.2Comfort
Airline reviews

Boarding was fine, difficult to understand the guy over the speaker though so we were unsure when exactly to board until they updated the monitor by the gate. Flight itself was fine, nice flight attendants, seats were comfortable enough, good selection of entertainment on the screens. Other airlines at a similar price point have included wifi though, at a minimum messaging, for free, so that was a little disappointing to not have that. But otherwise fine. Food was pretty decent, nice hot meal, good drink selection, nice snacks. Bathrooms were ok, could've been cleaned a little more often, but they were never bad.

8.0 ExcellentTim, Jun 2026
DUB - LAX
Read more Aer Lingus reviews

Boarding was fine, difficult to understand the guy over the speaker though so we were unsure when exactly to board until they updated the monitor by the gate. Flight itself was fine, nice flight attendants, seats were comfortable enough, good selection of entertainment on the screens. Other airlines at a similar price point have included wifi though, at a minimum messaging, for free, so that was a little disappointing to not have that. But otherwise fine. Food was pretty decent, nice hot meal, good drink selection, nice snacks. Bathrooms were ok, could've been cleaned a little more often, but they were never bad.

Aer Lingus App never showed the gate and the board did not update until very close to the time the gate was due to close. Both planes departed late but no announcement was made which would have saved a run for the gate.

Vegetarian food option was very poor. Effectively, overcooked rice ("risotto"). Zero protein which is always disappointing with no vegetables and poorly seasoned. Basically had lots of carbs on 6-hour flight. Not acceptable for business class in 2026. Flight was otherwise very good.

Small plane. Tight seating . What can one say except that it was fast!

I sat in the first row behind first class. There was plenty of legroom. The entertainment was great. I saw two excellent movies and one episode of a sitcom. Also enjoyed the flight tracker.

OK overall. Flight was delayed Crew on flight was good

On time, only a little turbulence, very competent and caring attendants. Clear information.

Late late late. Delayed and arrived an hour late for a 1 hour 45 minute connection. Every time. Poor record for this company. I try to fly any other carrier first.

The flights are literally always delayed arriving, boarding and taking off so they are always late for the connection. I planned ahead so I was okay but many others aren't. The food was terrible. The staff was very pleasant. I appreciate boarding back to front.

The crew was friendly. The plane was comfortable. In-flight wifi didn't work well at all. The ride was quite turbulent but understandable given the weather.

Everything you need to know for your flight from Portsmouth to Dulles Intl

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