How long is the flight from Portsmouth to Washington, D.C. Dulles Intl Airport?

British Airways can get you from Portsmouth to Washington, D.C. Dulles Intl Airport in just under 11h 55m. Your travel time can differ by up to . Airlines will cover a distance of 3639 mi.

In terms of precipitation, rainfall in Washington, D.C. Dulles Intl Airport ranges from 66.0 - 102.0 inches per month. May is typically the wettest month, when rainfall can reach 102.0 mm. February is typically the driest time to visit Washington, D.C. Dulles Intl Airport when rainfall is around 66.0 mm.

If weather is an important factor for your trip to Washington, D.C. Dulles Intl Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 27.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 2.0 C).

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

The cheapest flight price from Portsmouth to Washington, D.C. Dulles Intl Airport is £336. On average you can expect to pay £1,400. The most popular route, (Southampton Eastleigh - Washington, D.C. Dulles Intl), can usually be booked for £511.

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

Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Portsmouth to Washington, D.C. Dulles Intl Airport on time: Air Canada (78%), Austrian Airlines (78%), Copa Airlines (78%).

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

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

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

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

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

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

£443+ Cheap Flights from Portsmouth to Washington, D.C. Dulles Intl Airport

Cheap flight deals from Portsmouth to Dulles Intl

Enter your travel dates to find the best prices.

Cheapest

Best

Last-minute

One-way

Cheapest flights from Portsmouth to Dulles Intl
Explore the most affordable flight options available from Portsmouth to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 19 September 2026.

Tue 3/1109:20 -

1 stop11h 25m

Tue 10/1117:15 -

1 stop10h 35m

Deal found 19/9£507

Thu 29/1012:25 -

1 stop11h 55m

Thu 5/1117:15 -

1 stop13h 40m

Deal found 18/9£511

Wed 7/1009:20 -

1 stop15h 05m

Wed 14/1017:15 -

1 stop10h 25m

Deal found 18/9£512

Tue 13/1009:15 -

1 stop11h 30m

Tue 20/1021:05 -

1 stop17h 25m

Deal found 15/9£514

Sun 4/1009:20 -

1 stop11h 25m

Sun 11/1017:15 -

1 stop10h 25m

Deal found 15/9£517

Thu 12/1109:20 -

1 stop11h 25m

Sun 15/1117:15 -

1 stop10h 35m

Deal found 17/9£540

Find flight deals from Portsmouth to Dulles Intl

Round-trip from	£507
One-way from	£443
Popular in	June
Cheapest in	February
Average price	£487

British Airways
3/11-10/11
2 total stops
22h 00m total
Portsmouth to Washington, D.C.

Search Deals

Delta
23/11-31/12
1 total stop
12h 15m total
Portsmouth to Washington, D.C.

Search Deals

Highest demand for flights based on searches. 9% potential increase in price (£39 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease (£5 potential savings vs. average return price).

Search Deals

Average for round-trip flights in September 2026

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Cheapflights Fare Finder

Use the filters below to find and compare flights from Portsmouth to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SouthamptonWashington, D.C.

SOU Southampton Eastleigh - IAD Washington, D.C. Dulles Intl

SOUIAD

Southampton Eastleigh

Mon 23/11

08:40-15:55

1 stop12h 15m

Washington, D.C. Dulles Intl

Wed 31/12

00:00-06:00

Nonstop0h 00m

£443

Fastest return journey

SouthamptonWashington, D.C.

SOU Southampton Eastleigh - IAD Washington, D.C. Dulles Intl

SOUIAD

Southampton Eastleigh

Thu 14/1

09:20-15:45

1 stop11h 25m

Washington, D.C. Dulles Intl

Wed 31/12

00:00-06:00

Nonstop0h 00m

£455

SouthamptonWashington, D.C.

SOU Southampton Eastleigh - IAD Washington, D.C. Dulles Intl

SOUIAD

Southampton Eastleigh

Sat 3/10

09:20-19:10

1 stop14h 50m

Washington, D.C. Dulles Intl

Wed 31/12

00:00-06:00

Nonstop0h 00m

£466

SouthamptonWashington, D.C.

SOU Southampton Eastleigh - IAD Washington, D.C. Dulles Intl

SOUIAD

Southampton Eastleigh

Sun 29/11

20:00-15:45

1 stop24h 45m

Washington, D.C. Dulles Intl

Wed 31/12

00:00-06:00

Nonstop0h 00m

£467

SouthamptonWashington, D.C.

SOU Southampton Eastleigh - IAD Washington, D.C. Dulles Intl

SOUIAD

Southampton Eastleigh

Thu 29/10

12:25-20:20

1 stop11h 55m

Washington, D.C. Dulles Intl

Thu 5/11

20:50-11:55

1 stop10h 05m

£511

SouthamptonWashington, D.C.

SOU Southampton Eastleigh - IAD Washington, D.C. Dulles Intl

SOUIAD

Southampton Eastleigh

Wed 7/10

09:20-19:25

1 stop15h 05m

Washington, D.C. Dulles Intl

Wed 14/10

17:15-08:40

1 stop10h 25m

£512

SouthamptonWashington, D.C.

SOU Southampton Eastleigh - IAD Washington, D.C. Dulles Intl

SOUIAD

Southampton Eastleigh

Fri 6/11

20:00-15:45

1 stop24h 45m

Washington, D.C. Dulles Intl

Mon 9/11

20:50-19:30

1 stop17h 40m

£514

SouthamptonWashington, D.C.

SOU Southampton Eastleigh - IAD Washington, D.C. Dulles Intl

SOUIAD

Southampton Eastleigh

Wed 7/10

09:20-15:45

1 stop11h 25m

Washington, D.C. Dulles Intl

Tue 13/10

17:15-08:05

1 stop9h 50m

£515

SouthamptonWashington, D.C.

SOU Southampton Eastleigh - IAD Washington, D.C. Dulles Intl

SOUIAD

Southampton Eastleigh

Thu 12/11

09:20-15:45

1 stop11h 25m

Washington, D.C. Dulles Intl

Sun 15/11

17:15-08:50

1 stop10h 35m

£540

SouthamptonWashington, D.C.

SOU Southampton Eastleigh - IAD Washington, D.C. Dulles Intl

SOUIAD

Southampton Eastleigh

Tue 3/11

09:20-15:45

1 stop11h 25m

Washington, D.C. Dulles Intl

Tue 10/11

21:45-08:50

2 stops30h 05m

£556

Flights are sorted by cheapest return flights first.

Deals found on 19/9

Sorted by cheapest first

Best time to book a flight from Portsmouth to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Portsmouth with our price prediction graph.

SOU-IAD

Estimated return price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

P0R-IAD

SOU-IAD

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

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

Weekly flight availability from Portsmouth to Washington, D.C. Dulles Intl Airport

The most flights from P0R to IAD are scheduled on a Friday (29 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (18 on average).

Reviews of airlines servicing Dulles Intl

Get a feel of what it's like to fly with Aer Lingus from Portsmouth to Washington, D.C. Dulles Intl Airport by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Aer Lingus

7.3

Good

1,768 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Patrick,Sept 2026

DUB - IAD

I had a great experience. Crew was great and very accommodating.

Aer Lingus

7.3

Good

1,768 reviews

Aer Lingus

7.3

Good

1,768 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Patrick,Sept 2026

DUB - IAD

I had a great experience. Crew was great and very accommodating.

Related info for your journey

How long is the flight from Portsmouth to Washington, D.C. Dulles Intl Airport?
British Airways can get you from Portsmouth to Washington, D.C. Dulles Intl Airport in just under 11h 55m. Your travel time can differ by up to . Airlines will cover a distance of 3639 mi.
What are the most reliable airlines from Portsmouth to Washington, D.C. Dulles Intl Airport?
Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Portsmouth to Washington, D.C. Dulles Intl Airport on time: Air Canada (78%), Austrian Airlines (78%), Copa Airlines (78%).
What are the cheapest flights from Portsmouth to Washington, D.C. Dulles Intl Airport?
The cheapest flight price from Portsmouth to Washington, D.C. Dulles Intl Airport is £336. On average you can expect to pay £1,400. The most popular route, (Southampton Eastleigh - Washington, D.C. Dulles Intl), can usually be booked for £511.
Can I find deals for flights from Portsmouth to Dulles Intl that include hotel bookings?
Yes. In addition to deals on Portsmouth to Dulles Intl flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Portsmouth to Dulles Intl?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Portsmouth to Dulles Intl.
Can I find deals for business class flights from Portsmouth to Dulles Intl?
Yes. Cheapflights offers flight deals from Portsmouth to Dulles Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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Grimsby to Reagan-National flights

Top 10 airlines flying from Portsmouth to Dulles Intl

Airline	Cheapest	Average	Flexibility	On-time
Icelandair	Cheapest£286	Average£425	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
TAP AIR PORTUGAL	Cheapest£384	Average£448	FlexibilityNo cancel fee	On-timeN/A	Search TAP AIR PORTUGAL flights
Aer Lingus	Cheapest£402	Average£594	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
British Airways	Cheapest£408	Average£563	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Air France	Cheapest£408	Average£630	FlexibilityNo cancel fee	On-time77%	Search Air France flights
Lufthansa	Cheapest£408	Average£563	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
Virgin Atlantic	Cheapest£409	Average£551	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
Scandinavian Airlines	Cheapest£410	Average£483	FlexibilityNo cancel fee	On-time77%	Search Scandinavian Airlines flights
Iberia	Cheapest£416	Average£563	FlexibilityNo cancel fee	On-time77%	Search Iberia flights
Finnair	Cheapest£418	Average£587	FlexibilityNo cancel fee	On-time76%	Search Finnair flights

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When you search for this flight from Portsmouth to Dulles Intl, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

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Cheap flights from Portsmouth to Washington, D.C. Dulles Intl Airport from £443

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 23/11. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Portsmouth to Dulles Intl

Cheapest flights from Portsmouth to Dulles IntlExplore the most affordable flight options available from Portsmouth to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 19 September 2026.

Explore the most affordable flight options available from Portsmouth to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 19 September 2026.

Best flights from Portsmouth to Dulles IntlDiscover carefully curated flight deals from Portsmouth to Dulles Intl that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 19 September 2026.

Discover carefully curated flight deals from Portsmouth to Dulles Intl that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 19 September 2026.

Last-minute flights from Portsmouth to Dulles IntlDiscover last-minute flight deals from Portsmouth to Dulles Intl. Data last updated 19 September 2026 and is based on user searches.

Discover last-minute flight deals from Portsmouth to Dulles Intl. Data last updated 19 September 2026 and is based on user searches.

One-way flights from Portsmouth to Dulles IntlSearch for one-way flight options from Portsmouth to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated 19 September 2026.

Search for one-way flight options from Portsmouth to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated 19 September 2026.

Find flight deals from Portsmouth to Dulles Intl

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Cheapest in

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Use the filters below to find and compare flights from Portsmouth to Washington, D.C. Dulles Intl Airport that are best for you.

Best time to book a flight from Portsmouth to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Portsmouth with our price prediction graph.

Cheapflights Insights

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

Find hourly flight availability from Portsmouth to Dulles Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 19 September 2026.

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

Weekly flight availability from Portsmouth to Washington, D.C. Dulles Intl Airport

The most flights from P0R to IAD are scheduled on a Friday (29 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (18 on average).

Reviews of airlines servicing Dulles Intl

Get a feel of what it's like to fly with Aer Lingus from Portsmouth to Washington, D.C. Dulles Intl Airport by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

How long is the flight from Portsmouth to Washington, D.C. Dulles Intl Airport?

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

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

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

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

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

Travelling to a place near Washington, D.C. Dulles Intl Airport?

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Alternative routes for Portsmouth to Dulles Intl

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Complete your trip

Complete your trip to Dulles Intl by adding a car hire and/or hotel booking to your travel itinerary.

Direct flights to District of Columbia

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Other flights to Dulles Intl

Explore flights to Dulles Intl departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 19 September 2026.

Search flights from Portsmouth to Dulles Intl by cabin class

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Portsmouth and Dulles Intl flights

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Cheapest flights from Portsmouth to Dulles Intl
Explore the most affordable flight options available from Portsmouth to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 19 September 2026.

Best flights from Portsmouth to Dulles Intl
Discover carefully curated flight deals from Portsmouth to Dulles Intl that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 19 September 2026.

Last-minute flights from Portsmouth to Dulles Intl
Discover last-minute flight deals from Portsmouth to Dulles Intl. Data last updated 19 September 2026 and is based on user searches.

One-way flights from Portsmouth to Dulles Intl
Search for one-way flight options from Portsmouth to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated 19 September 2026.