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Portsmouth

Cheap flights from Dulles Intl (IAD) to Portsmouth, England

IAD — LHR
Nov 16 — Nov 231
Mon 11/16
Mon 11/23
1 adult, Economy
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Find flight deals from Dulles Intl to Portsmouth

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Popular in

June

Cheapest in

January

Average price

$871
Provider with most accurate pricing for Washington, D.C. (WAS)-London (LON) flight deals.
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Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-London (LON) flights.
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Highest demand for flights based on searches. 17% potential increase in price ($180 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($33 potential savings vs. average RT price).
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Average for round-trip flights in October 2026
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Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. Dulles Intl Airport to Portsmouth

What is the cheapest time of day to fly from IAD to P0R?

When flying from Washington, D.C. Dulles Intl Airport to Portsmouth, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Reviews of airlines servicing Portsmouth

Read through reviews of airlines operating flights from Washington, D.C. Dulles Intl Airport to Portsmouth, such as Aer Lingus. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Aer Lingus
7.3
Good
1,842 reviews

Crew

8.1

Entertainment

7.0

Boarding

7.5

Overall

7.3

Comfort

7.2

Food

6.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Nov 2025

DUB - EDI

Fine except for app. Couldn’t check in online - kept saying I couldn’t check in until the morning after my flight. On second leg I could check in but couldn’t get my boarding pass into my wallet. Thankfully I took a screenshot of it because I couldn’t retrieve it when we boarded - the app prohibited it.
Aer Lingus
7.3
Good
1,842 reviews
Aer Lingus
7.3
Good
1,842 reviews

Crew

8.1

Entertainment

7.0

Boarding

7.5

Overall

7.3

Comfort

7.2

Food

6.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Nov 2025

DUB - EDI

Fine except for app. Couldn’t check in online - kept saying I couldn’t check in until the morning after my flight. On second leg I could check in but couldn’t get my boarding pass into my wallet. Thankfully I took a screenshot of it because I couldn’t retrieve it when we boarded - the app prohibited it.

Related info for your journey

  • What are the most reliable airlines from Washington, D.C. Dulles Intl Airport to Portsmouth?

    Consider Iberia (87%), Aer Lingus (81%) or KLM (78%) when booking your flight. These represent the most reliable airlines when flying from Washington, D.C. Dulles Intl Airport to Portsmouth.

  • What are the cheapest flights from Washington, D.C. Dulles Intl Airport to Portsmouth?

    While on average a flight from Washington, D.C. Dulles Intl Airport to Portsmouth is generally $1,416, our data shows the cheapest flight currently is $346. When looking at the most popular route, (Washington, D.C. Dulles Intl - Southampton Eastleigh), you can expect to pay $1,237 for that flight.

  • Can I find deals for flights from Dulles Intl to Portsmouth that include hotel bookings?

    Yes. In addition to deals on Dulles Intl to Portsmouth flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Dulles Intl to Portsmouth?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Dulles Intl to Portsmouth.

  • Can I find deals for business class flights from Dulles Intl to Portsmouth?

    Yes. Cheapflights offers flight deals from Dulles Intl to Portsmouth by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Top 10 airlines flying from Dulles Intl to Portsmouth

AirlineCheapestAverageFlexibilityOn-time
TAP AIR PORTUGALCheapest$422Average$646FlexibilityNo cancel feeOn-timeN/A
Virgin AtlanticCheapest$432Average$942FlexibilityNo cancel feeOn-time72%
DeltaCheapest$450Average$1,071FlexibilityNo cancel feeOn-timeN/A
IcelandairCheapest$489Average$676FlexibilityNo cancel feeOn-time76%
IberiaCheapest$500Average$865FlexibilityNo cancel feeOn-time77%
Scandinavian AirlinesCheapest$568Average$805FlexibilityNo cancel feeOn-time77%
Air FranceCheapest$581Average$1,067FlexibilityNo cancel feeOn-time77%
SWISSCheapest$593Average$870FlexibilityNo cancel feeOn-time79%
FinnairCheapest$606Average$881FlexibilityNo cancel feeOn-time76%
Aer LingusCheapest$612Average$988FlexibilityNo cancel feeOn-timeN/A

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