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Cheap flights from Washington to Cardiff from $278

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 4/14. 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
1:50 pm - 4:45 pm
SEA
-
CWL
18h 55m
1 stop
Multiple Airlines Logo
9:45 am - 10:05 pm
CWL
-
SEA
20h 20m
2 stops
$1,088Multiple Airlines
Tue, Jun 23 - Tue, Jun 30
Delta Logo
12:00 pm - 4:45 pm
SEA
-
CWL
20h 45m
2 stops
Delta Logo
9:45 am - 10:05 pm
CWL
-
SEA
20h 20m
2 stops
$1,123Delta
Tue, Jun 23 - Tue, Jun 30
Delta Logo
12:00 pm - 4:45 pm
SEA
-
CWL
20h 45m
2 stops
Delta Logo
9:45 am - 10:05 pm
CWL
-
SEA
20h 20m
2 stops
$1,125Delta
Tue, Jun 23 - Tue, Jun 30
Multiple Airlines Logo
9:05 pm - 7:40 pm
SEA
-
CWL
15h 35m
1 stop
Multiple Airlines Logo
10:25 pm - 7:15 pm
CWL
-
SEA
27h 50m
2 stops
$1,142Multiple Airlines
Fri, Mar 20 - Fri, Mar 27
Air France Logo
1:50 pm - 4:45 pm
SEA
-
CWL
18h 55m
1 stop
Air France Logo
5:15 pm - 4:20 pm
CWL
-
SEA
31h 05m
1 stop
$1,144Air France
Tue, Jun 23 - Tue, Jun 30
WestJet Logo
7:05 am - 10:15 am
SEA
-
CWL
43h 10m
2 stops
WestJet Logo
11:35 am - 8:28 pm
CWL
-
SEA
40h 53m
2 stops
$1,157WestJet
Tue, Jun 23 - Tue, Jun 30
Delta Logo
9:50 am - 4:45 pm
SEA
-
CWL
22h 55m
2 stops
Delta Logo
9:45 am - 4:24 pm
CWL
-
SEA
14h 39m
1 stop
$1,181Delta
Tue, Jun 23 - Tue, Jun 30
Air France Logo
1:50 pm - 4:45 pm
SEA
-
CWL
18h 55m
1 stop
Air France Logo
5:15 pm - 4:20 pm
CWL
-
SEA
31h 05m
1 stop
$1,217Air France
Tue, Jun 23 - Tue, Jun 30
Multiple Airlines Logo
7:20 am - 9:15 am
SEA
-
CWL
17h 55m
2 stops
Multiple Airlines Logo
5:15 pm - 4:20 pm
CWL
-
SEA
31h 05m
1 stop
$1,222Multiple Airlines
Tue, Jun 23 - Tue, Jun 30
Delta Logo
1:50 pm - 4:45 pm
SEA
-
CWL
18h 55m
1 stop
Delta Logo
9:45 am - 4:24 pm
CWL
-
SEA
14h 39m
1 stop
$1,242Delta
Tue, Jun 23 - Tue, Jun 30

Delta flights from State of Washington to Cardiff

Our best Delta deals on State of Washington to Cardiff flight tickets
Delta
Jun 23
SEA12:00 pmSeattle/Tacoma Intl
20h 45m
2 stops
CWL4:45 pmCardiff Wales
Jun 30
CWL9:45 amCardiff Wales
20h 20m
2 stops
SEA10:05 pmSeattle/Tacoma Intl
$1,123
Delta
Jun 23
SEA12:00 pmSeattle/Tacoma Intl
20h 45m
2 stops
CWL4:45 pmCardiff Wales
Jun 30
CWL9:45 amCardiff Wales
20h 20m
2 stops
SEA10:05 pmSeattle/Tacoma Intl
$1,125
Delta
Jun 23
SEA9:50 amSeattle/Tacoma Intl
22h 55m
2 stops
CWL4:45 pmCardiff Wales
Jun 30
CWL9:45 amCardiff Wales
14h 39m
1 stop
SEA4:24 pmSeattle/Tacoma Intl
$1,181

Air France flights from State of Washington to Cardiff

Our best Air France deals on State of Washington to Cardiff flight tickets
Air France
Jun 23
SEA1:50 pmSeattle/Tacoma Intl
18h 55m
1 stop
CWL4:45 pmCardiff Wales
Jun 30
CWL5:15 pmCardiff Wales
31h 05m
1 stop
SEA4:20 pmSeattle/Tacoma Intl
$1,144
Air France
Jun 23
SEA1:50 pmSeattle/Tacoma Intl
18h 55m
1 stop
CWL4:45 pmCardiff Wales
Jun 30
CWL5:15 pmCardiff Wales
31h 05m
1 stop
SEA4:20 pmSeattle/Tacoma Intl
$1,217

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 February 4, 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

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 6/23

1:50 pm-4:45 pm

1 stop18h 55m

Cardiff Wales

Tue 6/30

9:45 am-10:05 pm

2 stops20h 20m

$1,088

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 6/23

12:00 pm-4:45 pm

2 stops20h 45m

Cardiff Wales

Tue 6/30

9:45 am-10:05 pm

2 stops20h 20m

$1,123

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 6/23

12:00 pm-4:45 pm

2 stops20h 45m

Cardiff Wales

Tue 6/30

9:45 am-10:05 pm

2 stops20h 20m

$1,125

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Fri 3/20

9:05 pm-7:40 pm

1 stop15h 35m

Cardiff Wales

Fri 3/27

10:25 pm-7:15 pm

2 stops27h 50m

$1,142

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 6/23

1:50 pm-4:45 pm

1 stop18h 55m

Cardiff Wales

Tue 6/30

5:15 pm-4:20 pm

1 stop31h 05m

$1,144

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 6/23

7:05 am-10:15 am

2 stops43h 10m

Cardiff Wales

Tue 6/30

11:35 am-8:28 pm

2 stops40h 53m

$1,157

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 6/23

9:50 am-4:45 pm

2 stops22h 55m

Cardiff Wales

Tue 6/30

9:45 am-4:24 pm

1 stop14h 39m

$1,181

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 6/23

1:50 pm-4:45 pm

1 stop18h 55m

Cardiff Wales

Tue 6/30

5:15 pm-4:20 pm

1 stop31h 05m

$1,217

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 6/23

7:20 am-9:15 am

2 stops17h 55m

Cardiff Wales

Tue 6/30

5:15 pm-4:20 pm

1 stop31h 05m

$1,222

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Tue 6/23

1:50 pm-4:45 pm

1 stop18h 55m

Cardiff Wales

Tue 6/30

9:45 am-4:24 pm

1 stop14h 39m

$1,242

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 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 airlines fly to Cardiff?

Aer Lingus, Delta and KLM are the top three most popular airlines that fly to Cardiff from State of Washington according to our data. Aer Lingus is the first choice among our users, with 35% of people opting to fly with this airline when traveling to Cardiff. Keep in mind that there are 3 different airlines that fly to Cardiff on a routine basis, so you have a few additional options to choose from.

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

15h 35m

Direct flights

None
The fastest flight from State of Washington to Cardiff takes 15h 35m
There are no direct flights from State of Washington to Cardiff. There are no popular flight routes from State of Washington to Cardiff.
Search flight deals

  • 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.

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Find better results for your trip to the United Kingdom

Fly your favorite airline to Cardiff

Airlines are sorted and displayed according to clicks in the past 7 days on momondo
Aer Lingus
Delta
KLM