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Cheap flights from Washington to London from $479

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington to London departing on 5/29. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
6:45 pm - 4:35 pm
SEA
-
SOU
13h 50m1 stop
Multiple Airlines Logo
9:10 am - 9:47 pm
SOU
-
SEA
20h 37m2 stops
$1,353Multiple Airlines
Fri, May 29 - Sat, Jun 27
Multiple Airlines Logo
11:40 pm - 8:35 am
SEA
-
SOU
24h 55m2 stops
Multiple Airlines Logo
9:10 am - 9:47 pm
SOU
-
SEA
20h 37m2 stops
$1,356Multiple Airlines
Fri, May 29 - Sat, Jun 27
Aer Lingus Logo
6:45 pm - 4:35 pm
SEA
-
SOU
13h 50m1 stop
Aer Lingus Logo
5:05 pm - 4:59 pm
SOU
-
SEA
31h 54m1 stop
$1,522Aer Lingus
Fri, May 29 - Sat, Jun 27
Multiple Airlines Logo
2:10 pm - 4:35 pm
SEA
-
SOU
18h 25m2 stops
Multiple Airlines Logo
9:10 am - 10:32 am
SOU
-
SEA
33h 22m3 stops
$2,955Multiple Airlines
Fri, May 29 - Sat, Jun 27

momondo Fare Finder

 
Customize your flight search to find flights from State of Washington to Southampton that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated December 15, 2025.
Use the filters below to find and compare flights from Washington to Southampton that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Fri 5/29

6:45 pm-4:35 pm

1 stop13h 50m

Southampton Eastleigh

Sat 6/27

9:10 am-9:47 pm

2 stops20h 37m

$1,353

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Fri 5/29

11:40 pm-8:35 am

2 stops24h 55m

Southampton Eastleigh

Sat 6/27

9:10 am-9:47 pm

2 stops20h 37m

$1,356

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Fri 5/29

6:45 pm-4:35 pm

1 stop13h 50m

Southampton Eastleigh

Sat 6/27

5:05 pm-4:59 pm

1 stop31h 54m

$1,522

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Fri 5/29

2:10 pm-4:35 pm

2 stops18h 25m

Southampton Eastleigh

Sat 6/27

9:10 am-10:32 am

3 stops33h 22m

$2,955

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Fri 5/29

7:05 am-4:35 pm

3 stops25h 30m

$479

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Wed 5/6

5:30 pm-8:35 am

1 stop31h 05m

$524

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Wed 5/6

9:40 am-4:50 pm

2 stops23h 10m

$528

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Thu 5/7

1:45 pm-4:50 pm

1 stop19h 05m

$574

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Thu 5/7

12:00 pm-4:50 pm

2 stops20h 50m

$578

SeattleSouthampton

SEA - SOU

SEASOU

Seattle/Tacoma Intl

Fri 5/29

7:58 am-4:35 pm

2 stops24h 37m

$582

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 14 resultsSorted by cheapest first
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See travel insights to London from

How to get the cheapest flight ticket from State of Washington to Southampton

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to Southampton?

On average, the least expensive day to fly to Southampton from State of Washington is on a Saturday. momondo users have found tickets for Saturday departures for as low as $944. However, this price may fluctuate depending on the airline, the season, and holidays. When flying out on a Monday, the most expensive travel day of the week, you can expect to see flight prices from State of Washington to Southampton for around $1,316.

What is the cheapest time of day to depart on your flight to Southampton?

Flying to Southampton from State of Washington at noon is the least expensive time of day to depart. momondo users have found prices as low as $1,075 when looking at flights departing at noon. Flights to Southampton are more costly in the evening, with an average ticket price of $1,182. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

Can stopping save me money on State of Washington to Southampton flights?

You could potentially save up to 26% on your flight if you consider stops on a State of Washington to Southampton flight.

Cheap State of Washington to Southampton flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from State of Washington to Southampton

Fastest flight time

13h 50m

Direct flights

None
The fastest flight from State of Washington to Southampton takes 13h 50m
There are no direct flights from State of Washington to Southampton. There are no popular flight routes from State of Washington to Southampton.
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  • When did momondo last update prices for flights from Washington to Southampton Eastleigh Airport?

    Prices for flights from Washington to Southampton Eastleigh Airport are updated daily.

  • How old do you have to be to fly from Washington to Southampton Eastleigh Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Washington to Southampton Eastleigh Airport.

  • What documentation or ID do you need to fly to Southampton Eastleigh Airport?

    The travel and health documents required for your trip to Southampton Eastleigh Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Southampton Eastleigh Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Portsmouth

Why use momondo?

Why should I use momondo to find a flight deal from Washington to Southampton?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Washington to Southampton. momondo saves you time and could save you money on your trip.

Can I find flights from Washington to Southampton with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Washington to Southampton flights to just show those with flexible booking policies.

How can momondo help me find flights from Washington to Southampton?

Once all potential Washington to Southampton flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Washington to Southampton right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Southampton, momondo offers a useful price alert feature which will track prices for flights to Southampton from Washington and alert you when they change.

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