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Cheap flights from Washington to Cardiff from $546

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 Cardiff departing on 8/26. 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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Find the cheapest flights from Washington to Cardiff

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
7:10 pm - 11:25 pm
SEA
-
CWL
20h 15m
1 stop
Multiple Airlines Logo
10:50 pm - 6:45 pm
CWL
-
SEA
27h 55m
2 stops
$959Multiple Airlines
Tue, Sep 22 - Thu, Oct 8
Multiple Airlines Logo
7:10 pm - 11:25 pm
SEA
-
CWL
20h 15m
1 stop
Multiple Airlines Logo
7:45 am - 6:45 pm
CWL
-
SEA
19h 00m
2 stops
$988Multiple Airlines
Tue, Sep 22 - Fri, Oct 9
Multiple Airlines Logo
7:10 pm - 10:25 pm
SEA
-
CWL
19h 15m
1 stop
Multiple Airlines Logo
7:45 am - 6:45 pm
CWL
-
SEA
19h 00m
2 stops
$997Multiple Airlines
Wed, Sep 23 - Fri, Oct 9
Multiple Airlines Logo
7:10 pm - 9:20 pm
SEA
-
CWL
18h 10m
1 stop
Multiple Airlines Logo
10:50 pm - 6:45 pm
CWL
-
SEA
27h 55m
2 stops
$1,040Multiple Airlines
Sat, Sep 26 - Thu, Oct 8
Multiple Airlines Logo
7:10 pm - 10:20 pm
SEA
-
CWL
19h 10m
1 stop
Multiple Airlines Logo
7:45 am - 6:45 pm
CWL
-
SEA
19h 00m
2 stops
$1,046Multiple Airlines
Thu, Sep 24 - Fri, Oct 9
Multiple Airlines Logo
7:20 am - 9:15 am
SEA
-
CWL
17h 55m
2 stops
Multiple Airlines Logo
5:15 pm - 11:52 am
CWL
-
SEA
26h 37m
1 stop
$1,048Multiple Airlines
Wed, Sep 23 - Wed, Oct 7
Multiple Airlines Logo
7:20 am - 9:15 am
SEA
-
CWL
17h 55m
2 stops
Multiple Airlines Logo
9:45 am - 10:04 pm
CWL
-
SEA
20h 19m
2 stops
$1,053Multiple Airlines
Wed, Sep 23 - Fri, Oct 9
Multiple Airlines Logo
7:10 pm - 9:20 pm
SEA
-
CWL
18h 10m
1 stop
Multiple Airlines Logo
7:45 am - 6:45 pm
CWL
-
SEA
19h 00m
2 stops
$1,068Multiple Airlines
Sat, Sep 26 - Fri, Oct 9
Virgin Atlantic Logo
7:20 am - 9:15 am
SEA
-
CWL
17h 55m
2 stops
Virgin Atlantic Logo
5:15 pm - 11:52 am
CWL
-
SEA
26h 37m
1 stop
$1,085Virgin Atlantic
Thu, Sep 24 - Thu, Oct 8
Virgin Atlantic Logo
1:50 pm - 4:45 pm
SEA
-
CWL
18h 55m
1 stop
Virgin Atlantic Logo
5:15 pm - 11:52 am
CWL
-
SEA
26h 37m
1 stop
$1,086Virgin Atlantic
Thu, Sep 24 - Thu, Oct 8

Virgin Atlantic flights from State of Washington to Cardiff

Our best Virgin Atlantic deals on State of Washington to Cardiff flight tickets
Virgin Atlantic
Sep 24
SEA7:20 amSeattle/Tacoma Intl
17h 55m
2 stops
CWL9:15 amCardiff Wales
Oct 8
CWL5:15 pmCardiff Wales
26h 37m
1 stop
SEA11:52 amSeattle/Tacoma Intl
$1,085
Virgin Atlantic
Sep 24
SEA1:50 pmSeattle/Tacoma Intl
18h 55m
1 stop
CWL4:45 pmCardiff Wales
Oct 8
CWL5:15 pmCardiff Wales
26h 37m
1 stop
SEA11:52 amSeattle/Tacoma Intl
$1,086
Virgin Atlantic
Sep 24
SEA7:20 amSeattle/Tacoma Intl
17h 55m
2 stops
CWL9:15 amCardiff Wales
Oct 8
CWL5:15 pmCardiff Wales
36h 50m
2 stops
SEA10:05 pmSeattle/Tacoma Intl
$1,089

Delta flights from State of Washington to Cardiff

Our best Delta deals on State of Washington to Cardiff flight tickets
Delta
Sep 26
SEA5:40 pmSeattle/Tacoma Intl
31h 35m
1 stop
CWL9:15 amCardiff Wales
Oct 7
CWL9:45 amCardiff Wales
34h 07m
1 stop
SEA11:52 amSeattle/Tacoma Intl
$1,096
Delta
Sep 25
SEA11:53 pmSeattle/Tacoma Intl
25h 22m
2 stops
CWL9:15 amCardiff Wales
Oct 7
CWL9:45 amCardiff Wales
34h 07m
1 stop
SEA11:52 amSeattle/Tacoma Intl
$1,098
Delta
Sep 25
SEA3:55 pmSeattle/Tacoma Intl
33h 20m
2 stops
CWL9:15 amCardiff Wales
Oct 8
CWL9:45 amCardiff Wales
32h 20m
2 stops
SEA10:05 amSeattle/Tacoma Intl
$1,104

momondo Fare Finder

 
Customize your flight search to find flights from State of Washington to Cardiff 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 May 11, 2026.
Use the filters below to find and compare flights from Washington to Cardiff that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 9/22

7:10 pm-11:25 pm

1 stop20h 15m

Cardiff Wales

Thu 10/8

10:50 pm-6:45 pm

2 stops27h 55m

$959

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 9/22

7:10 pm-11:25 pm

1 stop20h 15m

Cardiff Wales

Fri 10/9

7:45 am-6:45 pm

2 stops19h 00m

$988

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 9/23

7:10 pm-10:25 pm

1 stop19h 15m

Cardiff Wales

Fri 10/9

7:45 am-6:45 pm

2 stops19h 00m

$997

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 9/26

7:10 pm-9:20 pm

1 stop18h 10m

Cardiff Wales

Thu 10/8

10:50 pm-6:45 pm

2 stops27h 55m

$1,040

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Thu 9/24

7:10 pm-10:20 pm

1 stop19h 10m

Cardiff Wales

Fri 10/9

7:45 am-6:45 pm

2 stops19h 00m

$1,046

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 9/23

7:20 am-9:15 am

2 stops17h 55m

Cardiff Wales

Wed 10/7

5:15 pm-11:52 am

1 stop26h 37m

$1,048

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Wed 9/23

7:20 am-9:15 am

2 stops17h 55m

Cardiff Wales

Fri 10/9

9:45 am-10:04 pm

2 stops20h 19m

$1,053
Quickest round-trip

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Sat 9/26

7:10 pm-9:20 pm

1 stop18h 10m

Cardiff Wales

Fri 10/9

7:45 am-6:45 pm

2 stops19h 00m

$1,068

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Thu 9/24

7:20 am-9:15 am

2 stops17h 55m

Cardiff Wales

Thu 10/8

5:15 pm-11:52 am

1 stop26h 37m

$1,085

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Thu 9/24

1:50 pm-4:45 pm

1 stop18h 55m

Cardiff Wales

Thu 10/8

5:15 pm-11:52 am

1 stop26h 37m

$1,086

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 12 resultsSorted by cheapest first
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See travel insights to Cardiff from

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

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 airline that flies from Washington to Cardiff Wales?

WestJet is the most popular carrier operating from Washington to Cardiff Wales

Cheap State of Washington to Cardiff flight deals and tips

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

Fastest flight time

17h 55m

Direct flights

None
The fastest flight from State of Washington to Cardiff takes 17h 55m
There are no direct flights from State of Washington to Cardiff. There are no popular flight routes from State of Washington to Cardiff.
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Frequently asked questions about flying from Washington to Cardiff

  • When did momondo last update prices for flights from Washington to Cardiff Wales Airport?

    Prices for flights from Washington to Cardiff Wales Airport refresh daily.

  • How old do you have to be to fly from Washington to Cardiff Wales Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Washington to Cardiff Wales Airport.

  • What documentation or ID do you need to fly to Cardiff Wales Airport?

    The necessary travel and health documents for your Cardiff Wales Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Why use momondo?

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

Finding the right flight to Cardiff from Washington is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Cardiff quick and easy, saving you time and money.

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

All flight searches from Washington to Cardiff on momondo can be filtered to show those which offer flexible booking policies.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Cardiff from Washington.

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

If you are not ready to book a flight from Washington to Cardiff now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Cardiff and let you know when they change.

An easier way to manage your Cardiff trip

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