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

A quick flight from Portsmouth to Washington, D.C. can take about 11h 25m. Aer Lingus provides one of the quickest options available for as low as £854. The distance from Portsmouth to Washington, D.C. is about 3639 mi. Both multi-stop and direct flights can be found to your destination and back.

In terms of precipitation, rainfall in Washington, D.C. 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. when rainfall is around 66.0 mm.

If weather is an important factor for your trip to Washington, D.C., 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 most popular routes from Portsmouth to Washington, D.C.?

The most popular route from Portsmouth to Washington, D.C. is Southampton Eastleigh - Baltimore/Washington. You may also consider Southampton Eastleigh - Washington, D.C. Dulles Intl or Southampton Eastleigh - Washington, D.C. Reagan-National.

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

On average you can expect to pay £1,229 for a flight from Portsmouth to Washington, D.C.. The cheapest flight overall is £437 while the most popular route, (Southampton Eastleigh - Baltimore/Washington) is currently priced at £808.

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

Consider Air Canada (87%), Austrian Airlines (87%) or Copa Airlines (87%) when booking your flight. These represent the most reliable airlines when flying from Portsmouth to Washington, D.C..

Can I find deals for flights from Portsmouth to Washington, D.C. that include hotel bookings?

Yes. In addition to deals on Portsmouth to Washington, D.C. flights, Cheapflights offers holiday packages that include both flights and hotel.

How can I find direct flights from Portsmouth to Washington, D.C.?

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

Can I find deals for business class flights from Portsmouth to Washington, D.C.?

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

£389+ Cheap Flights from Portsmouth to Washington, D.C.

Cheap flight deals from Portsmouth to Washington, D.C.

Enter your travel dates to find the best prices.

Cheapest

Best

Last-minute

One-way

Cheapest flights from Portsmouth to Washington, D.C.
Explore the most affordable flight options available from Portsmouth to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 25 April 2026.

Mon 18/509:20

SOU

IAD

1 stop15h 05m

Aer Lingus

Mon 25/517:15

IAD

SOU

1 stop10h 25m

Aer Lingus

Deal found 20/4£611

Thu 4/609:20

SOU

IAD

1 stop14h 40m

Aer Lingus

Thu 11/617:15

IAD

SOU

1 stop10h 25m

Aer Lingus

Deal found 20/4£634

Thu 29/1009:20

SOU

IAD

1 stop11h 15m

Aer Lingus

Thu 5/1117:05

IAD

SOU

1 stop10h 35m

Aer Lingus

Deal found 24/4£670

Mon 18/509:20

SOU

IAD

1 stop11h 25m

Multiple Airlines

Mon 25/521:00

IAD

SOU

2 stops30h 35m

Multiple Airlines

Deal found 20/4£685

Thu 29/1009:20

SOU

IAD

1 stop15h 10m

Multiple Airlines

Thu 5/1118:20

IAD

SOU

2 stops17h 15m

Multiple Airlines

Deal found 24/4£723

Thu 4/609:20

SOU

BWI

2 stops15h 05m

Multiple Airlines

Thu 11/620:30

BWI

SOU

2 stops18h 00m

Multiple Airlines

Deal found 20/4£793

Thu 29/1020:00

SOU

BWI

2 stops27h 45m

Multiple Airlines

Thu 5/1120:35

BWI

SOU

2 stops17h 55m

Multiple Airlines

Deal found 21/4£807

Thu 4/617:20

SOU

DCA

3 stops34h 08m

Multiple Airlines

Thu 11/606:00

DCA

SOU

3 stops32h 30m

Multiple Airlines

Deal found 20/4£853

Sat 6/607:50

SOU

DCA

3 stops33h 11m

Multiple Airlines

Sat 13/618:55

DCA

SOU

2 stops16h 55m

Multiple Airlines

Deal found 21/4£856

Tue 23/606:45

SOU

BWI

2 stops17h 55m

British Airways

Tue 30/621:30

BWI

SOU

2 stops15h 15m

British Airways

Deal found 24/4£868

Thu 20/806:45

SOU

BWI

2 stops17h 55m

British Airways

Fri 18/921:30

BWI

SOU

2 stops31h 15m

British Airways

Deal found 24/4£905

Sat 6/609:15

SOU

BWI

3 stops18h 00m

Multiple Airlines

Sat 13/623:20

BWI

SOU

3 stops28h 15m

Multiple Airlines

Deal found 21/4£946

Find flight deals from Portsmouth to Washington, D.C.

Round-trip from	£611
One-way from	£389
Popular in	July
Cheapest in	February
Average price	£528

Aer Lingus
18/5-25/5
2 total stops
25h 30m total
Portsmouth to Washington, D.C.

Search Deals

5/9
3 total stops
30h 16m total
Portsmouth to Washington, D.C.

Search Deals

Highest demand for flights based on searches. 10% potential increase in price (£44 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease (£6 potential savings vs. average return price).

Search Deals

Average for round-trip flights in April 2026

Search Deals

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

Fastest return journey

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Mon 18/5

09:20-19:25

1 stop15h 05m

Washington, D.C. Dulles Intl

Mon 25/5

17:15-08:40

1 stop10h 25m

£611

SouthamptonBaltimore

SOU - BWI

SOUBWI

Southampton Eastleigh

Thu 4/6

09:20-19:25

2 stops15h 05m

Baltimore/Washington

Thu 11/6

20:30-19:30

2 stops18h 00m

£793

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Mon 18/5

17:20-20:29

3 stops32h 09m

Washington, D.C. Dulles Intl

Mon 25/5

08:18-19:30

3 stops30h 12m

£849

SouthamptonWashington, D.C.

SOU - DCA

SOUDCA

Southampton Eastleigh

Thu 4/6

17:20-22:28

3 stops34h 08m

Washington, D.C. Reagan-National

Thu 11/6

06:00-19:30

3 stops32h 30m

£853

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Thu 3/9

09:20-15:45

1 stop11h 25m

Washington, D.C. Dulles Intl

Mon 7/9

21:00-16:50

1 stop14h 50m

£854

SouthamptonWashington, D.C.

SOU - DCA

SOUDCA

Southampton Eastleigh

Sat 6/6

07:50-12:01

3 stops33h 11m

Washington, D.C. Reagan-National

Sat 13/6

18:55-16:50

2 stops16h 55m

£856

SouthamptonBaltimore

SOU - BWI

SOUBWI

Southampton Eastleigh

Tue 23/6

06:45-19:40

2 stops17h 55m

Baltimore/Washington

Tue 30/6

21:30-17:45

2 stops15h 15m

£868

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Sat 6/6

07:50-20:29

2 stops17h 39m

Washington, D.C. Dulles Intl

Sat 13/6

12:44-16:50

3 stops23h 06m

£885

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Tue 23/6

06:45-20:20

2 stops18h 35m

Washington, D.C. Dulles Intl

Tue 30/6

17:40-12:55

2 stops14h 15m

£888

SouthamptonBaltimore

SOU - BWI

SOUBWI

Southampton Eastleigh

Thu 20/8

06:45-19:40

2 stops17h 55m

Baltimore/Washington

Fri 18/9

21:30-09:45

2 stops31h 15m

£905

Flights are sorted by cheapest return flights first.

Deals found on 21/4

Showing 1-10 of 26 resultsSorted by cheapest first

Best time to book a flight from Portsmouth to Washington, D.C.

Have a flexible travel schedule? Discover the best time to fly to Washington, D.C. from Portsmouth with our price prediction graph.

SOU-BWI

SOU-IAD

SOU-DCA

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.

P0R-WAS

SOU-BWI

SOU-IAD

SOU-DCA

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

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Portsmouth to Washington, D.C. as you normally would.

Weekly flight availability from Portsmouth to Washington, D.C.

The most flights from P0R to WAS are scheduled on a Monday (28 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (26 on average).

Related info for your journey

How long is the flight from Portsmouth to Washington, D.C.?
A quick flight from Portsmouth to Washington, D.C. can take about 11h 25m. Aer Lingus provides one of the quickest options available for as low as £854. The distance from Portsmouth to Washington, D.C. is about 3639 mi. Both multi-stop and direct flights can be found to your destination and back.
What are the most popular routes from Portsmouth to Washington, D.C.?
The most popular route from Portsmouth to Washington, D.C. is Southampton Eastleigh - Baltimore/Washington. You may also consider Southampton Eastleigh - Washington, D.C. Dulles Intl or Southampton Eastleigh - Washington, D.C. Reagan-National.
What are the most reliable airlines from Portsmouth to Washington, D.C.?
Consider Air Canada (87%), Austrian Airlines (87%) or Copa Airlines (87%) when booking your flight. These represent the most reliable airlines when flying from Portsmouth to Washington, D.C..
What are the cheapest flights from Portsmouth to Washington, D.C.?
On average you can expect to pay £1,229 for a flight from Portsmouth to Washington, D.C.. The cheapest flight overall is £437 while the most popular route, (Southampton Eastleigh - Baltimore/Washington) is currently priced at £808.
Can I find deals for flights from Portsmouth to Washington, D.C. that include hotel bookings?
Yes. In addition to deals on Portsmouth to Washington, D.C. flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Portsmouth to Washington, D.C.?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Portsmouth to Washington, D.C..
Can I find deals for business class flights from Portsmouth to Washington, D.C.?
Yes. Cheapflights offers flight deals from Portsmouth to Washington, D.C. 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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Washington, D.C. flight routes

Alternative routes for Portsmouth to Washington, D.C.

Heathrow to Dulles Intl flights

Heathrow to Reagan-National flights

Gatwick to Dulles Intl flights

Stansted to Dulles Intl flights

London City to Dulles Intl flights

Gatwick to Reagan-National flights

Luton to Dulles Intl flights

Manchester to Dulles Intl flights

Edinburgh to Dulles Intl flights

Manchester to Reagan-National flights

Edinburgh to Reagan-National flights

Birmingham to Dulles Intl flights

Birmingham to Reagan-National flights

Leeds to Dulles Intl flights

Newcastle upon Tyne to Dulles Intl flights

Southend to Dulles Intl flights

Bristol to Dulles Intl flights

London City to Reagan-National flights

Southampton to Dulles Intl flights

Bristol to Reagan-National flights

Newcastle upon Tyne to Reagan-National flights

Leeds to Reagan-National flights

Southampton to Reagan-National flights

Exeter to Dulles Intl flights

Doncaster to Dulles Intl flights

Norwich to Reagan-National flights

Norwich to Dulles Intl flights

Grimsby to Dulles Intl flights

Grimsby to Reagan-National flights

Top 10 airlines flying from Portsmouth to Washington, D.C.

Airline	Cheapest	Average	Flexibility	On-time
Delta	Cheapest£187	Average£572	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
PLAY	Cheapest£317	Average£486	FlexibilityNo cancel fee	On-timeN/A	Search PLAY flights
United Airlines	Cheapest£329	Average£518	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
TAP AIR PORTUGAL	Cheapest£330	Average£410	FlexibilityNo cancel fee	On-timeN/A	Search TAP AIR PORTUGAL flights
Icelandair	Cheapest£331	Average£520	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
Aer Lingus	Cheapest£362	Average£667	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
KLM	Cheapest£375	Average£549	FlexibilityNo cancel fee	On-time75%	Search KLM flights
Air Canada	Cheapest£397	Average£570	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
Lufthansa	Cheapest£400	Average£576	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
Virgin Atlantic	Cheapest£406	Average£525	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights

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Deals for Portsmouth to Washington, D.C. flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Portsmouth to Washington, D.C.?

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Can Cheapflights find flights from Portsmouth to Washington, D.C. with no change fees?

Certainly. Search results for flights to Washington, D.C. from Portsmouth shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Portsmouth to Washington, D.C. become cheaper?

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Cheap flights from Portsmouth to Washington, D.C. from £389

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/9. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Portsmouth to Washington, D.C.

Cheapest flights from Portsmouth to Washington, D.C.Explore the most affordable flight options available from Portsmouth to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 25 April 2026.

Explore the most affordable flight options available from Portsmouth to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 25 April 2026.

Best flights from Portsmouth to Washington, D.C.Discover carefully curated flight deals from Portsmouth to Washington, D.C. that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 25 April 2026.

Discover carefully curated flight deals from Portsmouth to Washington, D.C. that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 25 April 2026.

Last-minute flights from Portsmouth to Washington, D.C.Discover last-minute flight deals from Portsmouth to Washington, D.C.. Data last updated 25 April 2026 and is based on user searches.

Discover last-minute flight deals from Portsmouth to Washington, D.C.. Data last updated 25 April 2026 and is based on user searches.

One-way flights from Portsmouth to Washington, D.C.Search for one-way flight options from Portsmouth to Washington, D.C.. Find affordable one-way fares based on user searches. Data last updated 25 April 2026.

Search for one-way flight options from Portsmouth to Washington, D.C.. Find affordable one-way fares based on user searches. Data last updated 25 April 2026.

Find flight deals from Portsmouth to Washington, D.C.

Keep the following information in mind while searching for Portsmouth to Washington, D.C. flight deals. Data was last updated 25 April 2026.

Round-trip from

One-way from

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Best time to book a flight from Portsmouth to Washington, D.C.

Have a flexible travel schedule? Discover the best time to fly to Washington, D.C. from Portsmouth with our price prediction graph.

Cheapflights Insights

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

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

Find hourly flight availability from Portsmouth to Washington, D.C.. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 25 April 2026.

Weekly flight availability from Portsmouth to Washington, D.C.

Related info for your journey

Find useful and relevant information for your journey from Portsmouth to Washington, D.C.. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

What are the most popular routes from Portsmouth to Washington, D.C.?

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

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

Can I find deals for flights from Portsmouth to Washington, D.C. that include hotel bookings?

How can I find direct flights from Portsmouth to Washington, D.C.?

Can I find deals for business class flights from Portsmouth to Washington, D.C.?

Travelling to a place near Washington, D.C.?

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Alternative routes for Portsmouth to Washington, D.C.

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Complete your trip

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Portsmouth and Washington, D.C. flights

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Portsmouth to Washington, D.C. flights

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Top 10 airlines flying from Portsmouth to Washington, D.C.

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Cheapest flights from Portsmouth to Washington, D.C.
Explore the most affordable flight options available from Portsmouth to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 25 April 2026.

Best flights from Portsmouth to Washington, D.C.
Discover carefully curated flight deals from Portsmouth to Washington, D.C. that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 25 April 2026.

Last-minute flights from Portsmouth to Washington, D.C.
Discover last-minute flight deals from Portsmouth to Washington, D.C.. Data last updated 25 April 2026 and is based on user searches.

One-way flights from Portsmouth to Washington, D.C.
Search for one-way flight options from Portsmouth to Washington, D.C.. Find affordable one-way fares based on user searches. Data last updated 25 April 2026.