£388 Find Cheap Flights from Portsmouth to Washington, D.C.

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 Washington, D.C. departing on 13/7. 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

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Everything you should know

Cheapest return fare
£521
British Airways
Wed 4/3Sun 8/3
SOU - IAD • 1 stop
Cheapest one-way flight
£388
Multiple Airlines
Mon 13/7
SOU - BWI • 3 stops
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Flight Deals
Useful Info
Flight Deals

Cheap Flights from Portsmouth to Washington, D.C.

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from Portsmouth to Washington, D.C. 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 Washington, D.C.

Wed, 4 Mar - Sun, 8 Mar
British Airways Logo
12:25 - 19:30
SOU
-
IAD
12h 05m
1 stop
British Airways Logo
18:05 - 08:45
IAD
-
SOU
10h 40m
1 stop
£521British Airways
Fri, 13 Mar - Fri, 20 Mar
Delta Logo
08:50 - 23:44
SOU
-
DCA
18h 54m
2 stops
Delta Logo
06:14 - 08:50
DCA
-
SOU
22h 36m
2 stops
£542Delta
Wed, 4 Mar - Sun, 8 Mar
British Airways Logo
12:25 - 19:30
SOU
-
IAD
12h 05m
1 stop
British Airways Logo
22:45 - 18:30
IAD
-
SOU
15h 45m
2 stops
£542British Airways
Fri, 13 Mar - Fri, 20 Mar
Virgin Atlantic Logo
08:50 - 22:51
SOU
-
DCA
18h 01m
2 stops
Virgin Atlantic Logo
06:14 - 08:50
DCA
-
SOU
22h 36m
2 stops
£573Virgin Atlantic
Wed, 4 Mar - Sun, 8 Mar
British Airways Logo
08:55 - 19:55
SOU
-
IAD
16h 00m
2 stops
British Airways Logo
22:45 - 18:30
IAD
-
SOU
15h 45m
2 stops
£582British Airways
Fri, 13 Mar - Fri, 20 Mar
British Airways Logo
09:30 - 20:30
SOU
-
IAD
15h 00m
1 stop
British Airways Logo
18:05 - 08:45
IAD
-
SOU
10h 40m
1 stop
£606British Airways
Fri, 13 Mar - Fri, 20 Mar
Multiple Airlines Logo
08:50 - 17:05
SOU
-
IAD
12h 15m
1 stop
Multiple Airlines Logo
19:29 - 08:50
IAD
-
SOU
33h 21m
2 stops
£634Multiple Airlines
Fri, 13 Mar - Fri, 20 Mar
KLM Logo
08:50 - 20:30
SOU
-
IAD
15h 40m
2 stops
KLM Logo
22:40 - 17:00
IAD
-
SOU
14h 20m
2 stops
£683KLM
Fri, 13 Mar - Fri, 20 Mar
Multiple Airlines Logo
17:35 - 19:45
SOU
-
DCA
30h 10m
3 stops
Multiple Airlines Logo
06:59 - 14:50
DCA
-
SOU
27h 51m
3 stops
£707Multiple Airlines
Fri, 13 Mar - Fri, 20 Mar
Delta Logo
08:50 - 23:01
SOU
-
BWI
18h 11m
2 stops
Delta Logo
15:35 - 17:00
BWI
-
SOU
21h 25m
2 stops
£708Delta
Useful Info

Good to know - Cheap tickets from Portsmouth to Washington, D.C.

Low seasonFebruary
Cheapest flight£388
Best time to beat the crowds (15% less expensive on average)
Most popular time to fly (9% more expensive on average)
Flight from Southampton to Baltimore

When to book flights from Portsmouth to Washington, D.C.

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

FAQs for booking flights from Portsmouth to Washington, D.C.

  • How does KAYAK find such low prices on flights from Portsmouth to Washington, D.C.?

    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, D.C..

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

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

  • What is the Hacker Fare option on flights from Portsmouth to Washington, D.C.?

    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, D.C. 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, D.C.?

    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, D.C. 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 Washington, D.C.

 
Need help choosing which airline to fly with from Portsmouth to Washington, D.C.? 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.
7.2
Aer LingusOverall score based on 1443 reviews
7.1Comfort
6.9Entertainment
6.6Food
7.4Boarding
8.0Crew
Airline reviews

One of the best flight experiences I've have had in along time. Would fly with them again.

10.0 ExcellentDoug, Jan 2026
DUB - MCO
Read more Aer Lingus reviews

One of the best flight experiences I've have had in along time. Would fly with them again.

Like getting a bus. No great luxury but will get you there

Got us to destination alive, albeit a bit late. Luggage was left behind. No live tracking app available (available on some other airlines). Supposedly going to be delivered in next couple of days.

So, the trip from Dublin to LA did not really happen because the flight took off before we could finish the transfer.

Very nice experience. Flight had good entertainment system and good food options. Customer service was very friendly and nice as well.

The connection time between the regional flight (from Newcastle) to an international flight (to The States) was too short. To require as second security scan and customs clearance within an hour and 20 mins is not enough time to make the actual connection. We had a final boarding call the minute we walked out of US customs and had to sprint (with two small children) through 20 gates to make it in time before the door closed. The concept is great in theory to clear customs before leaving Europe, but the timing needs to be adjusted. We travel abroad frequently and won’t be using this route again. Thanks.

Like - the crew were nice Dislike - sitting on the tarmac for long periods after boarding and landing.

I was not admitted to the flight!!! i need a refund for this.

One of the best flights I've been on in a while. Very genuinely friendly staff. Courteous, kind, respectful. On a past flight (not Aer Lingus) I remember being woken up rudely to put my seat forward. Like a child being berated for something. Oddly jarring experience when someone could just tap you gently on the shoulder and gesture kindly. But I noticed the Aer Lingus staff were incredibly patient with everyone on the plane. It's the holiday season and I noticed a lot more elderly customers on the plane than I typically see flying, and the staff went above and beyond with helping accommodate people. Service throughout the flight was flawless. They came through offering water, and picking up garbage at perfect intervals. Seemed like this flight, everyone was on point. And the flight landed early on top of that

Seats are small, but comfortable and more space around you, so for a normal person the seats are perfect. If you are a big and fat individual, I would not think the seats are comfortable. All else was good and normal. Lots of movies to watch.

Everything you need to know for your flight from Portsmouth to Washington, D.C.

Cabin class types available on flights to Portsmouth

Cabin classes available on flights to Portsmouth. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.