£444 Find Cheap Flights from Portsmouth to Washington, D.C. – Compare and Save

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1 adult, Economy, 0 bags

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Everything you should know

Cheapest return flight
£509
Typical prices: £522-£603
British Airways
Fri 5/10Fri 12/10
SOU - IAD • 1 stop
Cheapest one-way flight
£444
Typical prices: £314-£571
Delta
Fri 23/11
SOU - IAD • 1 stop
When to travel
July
Cheapest • 10% price drop
March
Most popular
Good to know
+1
Good to know
+1
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We hope you enjoy your trip to Washington, D.C.!
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Flight Deals

Cheap Flights from Portsmouth to Washington, D.C.

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent return flight deals from Portsmouth to Washington, D.C.

Sun, 25 Oct - Sun, 1 Nov
British Airways Logo
09:20 - 20:20SOU  Southampton Eastleigh-IAD Washington, D.C. Dulles Intl
15h 00m1 stop Dublin
British Airways Logo
17:15 - 11:55IAD  Washington, D.C. Dulles Intl-SOU Southampton Eastleigh
13h 40m1 stop Dublin
£509British Airways
Mon, 5 Oct - Mon, 12 Oct
British Airways Logo
09:20 - 15:45SOU  Southampton Eastleigh-IAD Washington, D.C. Dulles Intl
11h 25m1 stop Dublin
British Airways Logo
20:55 - 19:30IAD  Washington, D.C. Dulles Intl-SOU Southampton Eastleigh
17h 35m1 stop Dublin
£509British Airways
Thu, 29 Oct - Thu, 5 Nov
British Airways Logo
12:25 - 20:20SOU  Southampton Eastleigh-IAD Washington, D.C. Dulles Intl
11h 55m1 stop Dublin
British Airways Logo
17:15 - 11:55IAD  Washington, D.C. Dulles Intl-SOU Southampton Eastleigh
13h 40m1 stop Dublin
£511British Airways
Wed, 18 Nov - Wed, 2 Dec
British Airways Logo
09:20 - 19:20SOU  Southampton Eastleigh-IAD Washington, D.C. Dulles Intl
15h 00m1 stop Dublin
British Airways Logo
20:50 - 11:55IAD  Washington, D.C. Dulles Intl-SOU Southampton Eastleigh
10h 05m1 stop Dublin
£512British Airways
Thu, 29 Oct - Thu, 5 Nov
British Airways Logo
12:25 - 20:20SOU  Southampton Eastleigh-IAD Washington, D.C. Dulles Intl
11h 55m1 stop Dublin
British Airways Logo
17:15 - 11:55IAD  Washington, D.C. Dulles Intl-SOU Southampton Eastleigh
13h 40m1 stop Dublin
£512British Airways
Wed, 7 Oct - Sun, 11 Oct
British Airways Logo
09:20 - 19:25SOU  Southampton Eastleigh-IAD Washington, D.C. Dulles Intl
15h 05m1 stop Dublin
British Airways Logo
17:15 - 16:50IAD  Washington, D.C. Dulles Intl-SOU Southampton Eastleigh
18h 35m1 stop Dublin
£513British Airways
Fri, 9 Oct - Fri, 16 Oct
British Airways Logo
20:00 - 15:45SOU  Southampton Eastleigh-IAD Washington, D.C. Dulles Intl
24h 45m1 stop Dublin
British Airways Logo
17:15 - 08:40IAD  Washington, D.C. Dulles Intl-SOU Southampton Eastleigh
10h 25m1 stop Dublin
£519British Airways
Thu, 22 Oct - Thu, 29 Oct
British Airways Logo
09:20 - 19:40SOU  Southampton Eastleigh-BWI Baltimore/Washington
15h 20m2 stops Dublin London Heathrow
British Airways Logo
19:55 - 19:10BWI  Baltimore/Washington-SOU Southampton Eastleigh
19h 15m2 stops London Heathrow Belfast City
£599British Airways
Thu, 29 Oct - Thu, 5 Nov
Aer Lingus Logo
20:00 - 17:20SOU  Southampton Eastleigh-IAD Washington, D.C. Dulles Intl
25h 20m2 stops Dublin Madrid Barajas
Aer Lingus Logo
17:50 - 08:45IAD  Washington, D.C. Dulles Intl-SOU Southampton Eastleigh
33h 55m2 stops Madrid Barajas Dublin
£651Aer Lingus
Mon, 5 Oct - Mon, 12 Oct
Aer Lingus Logo
08:55 - 15:45SOU  Southampton Eastleigh-IAD Washington, D.C. Dulles Intl
35h 50m3 stops Belfast City Glasgow Intl Dublin
Aer Lingus Logo
17:15 - 19:00IAD  Washington, D.C. Dulles Intl-SOU Southampton Eastleigh
20h 45m3 stops Dublin Glasgow Intl Belfast City
£999Aer Lingus
Booking Insights

Price, demand, and travel trends for Portsmouth to Washington, D.C. flights

Use KAYAK data on prices, travel dates, airlines, and seasonal trends to compare options and book flights from Portsmouth to Washington, D.C. with more confidence.

How much is a return flight from Portsmouth to Washington, D.C.?

Return flights from Portsmouth to Washington, D.C. start at £509. Prices are below average for this route right now, with typical return fares ranging from £522 to £603. The lowest price found in the past 5 days was £509 on British Airways.

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Key details for Portsmouth to Washington, D.C. flights

Low season

January

Cheapest flight

£444
Most popular time to fly (3% more expensive on average)
Flights from Southampton to Washington, D.C. Dulles Intl Airport

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

Your Portsmouth to Washington, D.C. flight questions, answered

Find helpful route details based on KAYAK data, including flight times, airports, airlines, and booking questions.

  • Which cabin classes can I book on flights from Portsmouth to Washington, D.C.?

    Only Economy class is available on flights from Portsmouth to Washington, D.C..

  • Which airports do connecting flights from Portsmouth to Washington, D.C. pass through?

    Connecting flights from Portsmouth to Washington, D.C. most commonly pass through:

    • Dublin (DUB) – 86% of one-stop connections
    • Amsterdam Schiphol (AMS) – 14% of one-stop connections
    Together, these airports account for 100% of one-stop bookings on this route.

  • Can I save money by using flexible dates for flights from Portsmouth to Washington, D.C.?

    Yes. Being flexible with your travel dates can save you up to 14% on the Portsmouth to Washington, D.C. route. Thursday is the cheapest departure day at £522 return on average, while Tuesday is the most expensive at £603, a difference of £81. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

  • What popular places can I visit in Washington, D.C.?

    Some of the most popular sights in Washington, D.C. are Union Station, Capital One Arena, and Charles Sumner School Museum and Archives. These are among the most viewed places in Washington, D.C. on KAYAK.

  • How long is a flight from Portsmouth to Washington, D.C.?

    There are currently no direct flights available from Portsmouth to Washington, D.C.. Flights with 1 stopover take between 11h 29m and 12h 03m in total, depending on the connection.

  • Do I need a passport to fly from Portsmouth to Washington, D.C.?

    Yes, a valid passport is required for this international route. Many destinations require at least six months of validity beyond your travel dates. Check your passport expiry well before booking.

  • Have flight prices from Portsmouth to Washington, D.C. changed much recently?

    Yes. Based on fares seen in the past 5 days, return flight prices on this route showed a wide range, from about £509 to £1,630. That means the highest observed fare was about 3x higher than the lowest one.

  • How are flight prices from Portsmouth to Washington, D.C. looking right now?

    One-way fares from Portsmouth to Washington, D.C. are currently lower than usual. Average one-way flight prices are about £447, which is 16% below the typical average for this route.

  • How much time can I save by choosing a different stopover airport from Portsmouth to Washington, D.C.?

    Flying via Dublin (DUB) gives the shortest average 1-stop total travel time of 11h 29m, compared to 12h 03m via Amsterdam Schiphol (AMS).

  • What is the time difference between Portsmouth and Washington, D.C.?

    Washington, D.C. is 5 hours behind Portsmouth (Eastern Time vs British Time). Plan for the time shift when scheduling connections or first-day activities.

  • What car hire options are available in Washington, D.C.?

    Since Washington, D.C. is served by multiple airports, car hire options and rates can vary depending on which one you fly into.
    Near Washington, D.C. Reagan-National Airport (DCA) – daily rates from around £17:

    • Sixt
    • Dollar
    • Thrifty
    • Alamo
    • Budget

    Near Washington, D.C. Dulles Intl Airport (IAD) – daily rates from around £18:

    • Dollar
    • Budget
    • Hertz
    • Sixt
    • Thrifty

  • How much should I expect to pay for a Portsmouth to Washington, D.C. flight?

    Return flights from Portsmouth to Washington, D.C. range from £522 to £603, with an average of £573 over the past 12 months. Anything below £522 counts as a good deal.

Your guide to booking Portsmouth to Washington, D.C. flights

Get tips on when to book, when to fly, and what to know before your trip.
  • If your dates are flexible, aim for a Thursday departure instead of Tuesday. On this route, Thursday flights average £522 – about £81 less than Tuesday (13% savings) based on the last 12 months.
  • If you can choose when to travel, plan your Portsmouth to Washington, D.C. trip for July. Fares historically average £518 return in that month – typically £521 less than the most expensive month, which is April (based on the last 12 months).
  • If you're arriving late at night and need somewhere to stay, check out these hotels close to Washington, D.C. Reagan-National Airport.
    - Hyatt House Washington DC The Wharf
    - Intercontinental Hotels Washington D.C. - The Wharf By IHG
    - Canopy by Hilton Washington D.C - The Wharf

More options for your flight from Portsmouth to Washington, D.C.

Complete your trip to Washington, D.C. with a hotel stay or car hire

Car hire in Washington, D.C.
Hotels in Washington, D.C.
Holidays in Washington, D.C.