Cheap flights from Portsmouth to Washington from £497
This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/3. Fares are subject to change and may not be available on all flights or dates of travel.
Find flight deals from Portsmouth to Washington
Cheapest flights from Portsmouth to WashingtonExplore the most affordable flight options available from Portsmouth to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 10 October 2025.
Explore the most affordable flight options available from Portsmouth to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 10 October 2025.
Cheap flight deals from Portsmouth to Washington
Keep the following information in mind while searching for Portsmouth to Washington flight deals. Data was last updated 10 October 2025.
Cheapflights Fare Finder
Use the filters below to find and compare flights from Portsmouth to Washington that are best for you.
Fly from
Fly to
Route
Depart
Return
Price
SouthamptonSeattle
SOU - SEA
SOUSEA
Southampton Eastleigh
Wed 4/3
08:40-12:51
2 stops36h 11m
Seattle/Tacoma Intl
Sun 8/3
16:00-08:10
1 stop33h 10m
SouthamptonSeattle
SOU - SEA
SOUSEA
Southampton Eastleigh
Wed 4/3
17:30-11:35
1 stop26h 05m
Seattle/Tacoma Intl
Sun 8/3
12:10-08:10
2 stops37h 00m
SouthamptonSeattle
SOU - SEA
SOUSEA
Southampton Eastleigh
Wed 4/3
08:40-11:35
1 stop34h 55m
Seattle/Tacoma Intl
Sun 8/3
16:00-08:10
1 stop33h 10m
SouthamptonSeattle
SOU - SEA
SOUSEA
Southampton Eastleigh
Mon 15/12
09:30-18:20
1 stop16h 50m
Best time to book a flight from Portsmouth to Washington
Have a flexible travel schedule? Discover the best time to fly to Washington from Portsmouth with our price prediction graph.
Cheapflights Insights
Everything you need to know about your flight from Portsmouth to Washington
What is the cheapest month to book a flight from Portsmouth to State of Washington?
Currently, March is the cheapest month in which you can book a flight from Portsmouth to State of Washington (average of £308). Flying from Portsmouth to State of Washington in August is currently the most expensive (average of £463). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from P0R to WA?
Find hourly flight availability from Portsmouth to Washington. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 10 October 2025.
A simple way to save on the total cost of your ticket is to fly from Portsmouth to State of Washington at midday. If you’re flexible enough to do this you can expect to save up to 3% on your trip compared to booking a flight in the morning.
What is the cheapest day to fly from Portsmouth to State of Washington?
Use this chart to determine the cheapest time to fly return from Portsmouth to Washington. Price data was last updated on 16 December 2024.
Travellers seeking maximum savings on their Portsmouth to State of Washington flight should consider departing on Wednesday mornings when fares are most often at their lowest. Friday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
Weekly flight availability from Portsmouth to State of Washington
Explore weekly flight availability from Portsmouth to Washington. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 10 October 2025.
The most flights from P0R to USWA are scheduled on a Monday (21 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (10 on average).
Related info for your journey
Find useful and relevant information for your journey from Portsmouth to Washington. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for Portsmouth to Washington
See prices for flight routes from nearby airports that may be better suited for you.
Top 10 airlines flying from Portsmouth to Washington
Discover the top 10 airlines that operate flights from Portsmouth to Washington. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 10 October 2025.
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Can Cheapflights find flights from Portsmouth to Washington with no change fees?
Yes, we can. To see specific flights from Portsmouth to Washington with no change fees, users can toggle flexible booking options after using the search form above to find flights.
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