£491 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 1/9. 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

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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, 17 Dec - Mon, 5 Jan
British Airways Logo
08:40 - 19:55SOU-IAD
16h 15m2 stops
British Airways Logo
18:20 - 15:30IAD-SOU
16h 10m2 stops
£994British Airways
Find Deal
Wed, 13 Aug - Wed, 20 Aug
British Airways Logo
09:10 - 19:30SOU-IAD
15h 20m1 stop
British Airways Logo
21:00 - 19:30IAD-SOU
17h 30m1 stop
£998British Airways
Find Deal
Wed, 17 Dec - Mon, 5 Jan
British Airways Logo
09:30 - 19:30SOU-IAD
15h 00m1 stop
British Airways Logo
18:20 - 15:30IAD-SOU
16h 10m2 stops
£1,002British Airways
Find Deal
Wed, 17 Dec - Mon, 5 Jan
British Airways Logo
09:30 - 19:30SOU-IAD
15h 00m1 stop
British Airways Logo
18:20 - 15:30IAD-SOU
16h 10m2 stops
£1,010British Airways
Find Deal
Wed, 17 Dec - Mon, 5 Jan
British Airways Logo
09:30 - 19:30SOU-IAD
15h 00m1 stop
British Airways Logo
17:05 - 08:45IAD-SOU
10h 40m1 stop
£1,048British Airways
Find Deal
Wed, 17 Dec - Mon, 5 Jan
British Airways Logo
09:30 - 19:30SOU-IAD
15h 00m1 stop
British Airways Logo
17:05 - 08:45IAD-SOU
10h 40m1 stop
£1,056British Airways
Find Deal
Wed, 17 Dec - Mon, 5 Jan
British Airways Logo
08:40 - 19:55SOU-IAD
16h 15m2 stops
British Airways Logo
18:20 - 15:30IAD-SOU
16h 10m2 stops
£1,233British Airways
Find Deal
Wed, 13 Aug - Wed, 20 Aug
British Airways Logo
08:40 - 17:30SOU-IAD
13h 50m2 stops
British Airways Logo
17:20 - 08:40IAD-SOU
10h 20m1 stop
£1,311British Airways
Find Deal
Useful Info

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

Low seasonFebruary
Cheapest flight£491
Best time to beat the crowds (14% less expensive on average)
Most popular time to fly (11% more expensive on average)
Flight from Southampton to Washington, D.C.

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.
7.1
Aer LingusOverall score based on 1192 reviews
6.4Food
7.1Comfort
7.3Boarding
8.0Crew
6.8Entertainment
Airline reviews

I appteciate the very courteous staff. The flight was good. Something that wasn't good was that my bag was only checked as far as Dublin and I had a connecting flight to Vienna. (That was a mistake the ORD desk made.) Fortunately the desk at DUB was able to re-tag without me having to re-check in (which initially it seemed I might have to do.)

8.0 ExcellentAnonymous, Jul 2025ORD - DUB
Read more Aer Lingus reviews

I appteciate the very courteous staff. The flight was good. Something that wasn't good was that my bag was only checked as far as Dublin and I had a connecting flight to Vienna. (That was a mistake the ORD desk made.) Fortunately the desk at DUB was able to re-tag without me having to re-check in (which initially it seemed I might have to do.)

I wish Aer Lingus offered free wifi and had power outlets at the seats. Overall, the flight was good. Seat back entertainment had some interesting options. Food and snack options were mediocre at best. I enjoyed the canned red wine.

I had an awful experience at the ticketing agent stand. I had purchased three tickets, one of which I had the maiden name of a passenger on the ticket. They refused to help, assist, and actually delayed our process and had us miss an opportunity to purchase a ticket on the same flight. I was sent through multiple phone calls, none of which helped, and the person at the counter was the person who told me to both call Aer Lingus for help and was the person who said they could not fulfill my request that they were privy to from the beginning. My partner is still stuck in Scotland, racking up thousands of dollars in additional fees and tickets. I am very upset and two of my tickets went unused. I will never be using Aer Lingus ever again and I will continue to complain about them.

This was the most expensive economy flight per minute of flight time ever. But the quality was lacking. Extremely Aer Lingus rude staff at LHR said that the flight from London to Dublin (Ireland) was “NOT international.” Horrified at the colonial and imperial perspective. Seats were dirty with trash in seat pockets. Airline doesn’t clean or care about hygiene and safety.

In business class overhead bins were minuscule. Had to use cabin staff to find a place for my carry-on bag. Boarding process was shambolic, as “passengers who needed assistance in boarding” absorbed an excessive amount of time and attention that Aer Lingus was apparently unprepared for.

Charging for coffee on a business class fare??? And to not even mention it? Inexcusable. Boarding and disembarking was pathetic. Could not use a jetway on either end. Had to use stairs and walk across tarmac at origination and use stairs and be bussed to terminal at destination.

Aer Lingus was fabulous.nhowever, Aiirfare Assist who Kayak routes me to to purchase tickets for m was awful. They messed up my reservation so bad that after about six hours on the phone with them over the week before departure, I had been choice but to show up at the airport. The Aer Lingus staff were amazing and got it sorted out but I would recommend not using Airfare Assist.

Dublin to Boston was decent. Food and entertainment was included and that was expected for the rate paid.

The Nice airport was a horrible boarding experience. I have never experienced the kind of compressed mob (in the B12-B17 gate area) of people all unclear what was happening and no airport staff to assist. There was no signage and 1000’s of people waiting for any info for 2 hours.

Flight was on time. Boarding was quick and efficient. Seats were comfortable. Food was fine.

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.

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