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Cheap flights from Washington to Cardiff from $331

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 8/12. 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
1 adult, Economy, 0 bags

Find the cheapest flights from Washington to Cardiff

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
10:30 am - 10:50 pm
SEA
-
CWL
28h 20m
3 stops
Multiple Airlines Logo
10:10 pm - 10:07 am
CWL
-
SEA
43h 57m
3 stops
$944Multiple Airlines
Mon, Aug 10 - Mon, Aug 17
Multiple Airlines Logo
7:10 pm - 10:50 pm
SEA
-
CWL
19h 40m
1 stop
Multiple Airlines Logo
10:10 pm - 10:07 am
CWL
-
SEA
43h 57m
3 stops
$976Multiple Airlines
Mon, Aug 10 - Mon, Aug 17
Multiple Airlines Logo
7:10 pm - 10:50 pm
SEA
-
CWL
19h 40m
1 stop
Multiple Airlines Logo
10:10 pm - 7:25 pm
CWL
-
SEA
29h 15m
2 stops
$982Multiple Airlines
Mon, Aug 10 - Mon, Aug 17
Multiple Airlines Logo
7:10 pm - 6:55 am
SEA
-
CWL
27h 45m
1 stop
Multiple Airlines Logo
10:50 pm - 9:00 pm
CWL
-
SEA
30h 10m
2 stops
$1,019Multiple Airlines
Thu, Aug 6 - Thu, Aug 13
Multiple Airlines Logo
7:10 pm - 10:50 pm
SEA
-
CWL
19h 40m
1 stop
Multiple Airlines Logo
10:10 pm - 10:07 am
CWL
-
SEA
43h 57m
3 stops
$1,020Multiple Airlines
Mon, Aug 10 - Mon, Aug 17
Multiple Airlines Logo
10:30 am - 10:50 pm
SEA
-
CWL
28h 20m
2 stops
Multiple Airlines Logo
10:10 pm - 10:07 am
CWL
-
SEA
43h 57m
3 stops
$1,023Multiple Airlines
Mon, Aug 10 - Mon, Aug 17
Multiple Airlines Logo
7:10 pm - 10:50 pm
SEA
-
CWL
19h 40m
1 stop
Multiple Airlines Logo
10:10 pm - 7:25 pm
CWL
-
SEA
29h 15m
2 stops
$1,024Multiple Airlines
Mon, Aug 10 - Mon, Aug 17
Multiple Airlines Logo
7:10 pm - 10:50 pm
SEA
-
CWL
19h 40m
1 stop
Multiple Airlines Logo
10:10 pm - 7:25 pm
CWL
-
SEA
29h 15m
2 stops
$1,025Multiple Airlines
Mon, Aug 10 - Mon, Aug 17
Multiple Airlines Logo
10:45 am - 10:50 pm
SEA
-
CWL
28h 05m
3 stops
Multiple Airlines Logo
10:10 pm - 10:07 am
CWL
-
SEA
43h 57m
3 stops
$1,060Multiple Airlines
Mon, Aug 10 - Mon, Aug 17
Multiple Airlines Logo
10:30 am - 10:50 pm
SEA
-
CWL
28h 20m
2 stops
Multiple Airlines Logo
10:10 pm - 10:07 am
CWL
-
SEA
43h 57m
3 stops
$1,066Multiple Airlines
Mon, Aug 10 - Mon, Aug 17

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Delta flights from State of Washington to Cardiff

Our best Delta deals on State of Washington to Cardiff flight tickets
Delta
Aug 10
SEA5:45 pmSeattle/Tacoma Intl
15h 00m
1 stop
CWL4:45 pmCardiff Wales
Aug 17
CWL9:45 amCardiff Wales
33h 52m
1 stop
SEA11:37 amSeattle/Tacoma Intl
$1,119
Delta
Aug 10
SEA5:45 pmSeattle/Tacoma Intl
15h 00m
1 stop
CWL4:45 pmCardiff Wales
Aug 17
CWL9:45 amCardiff Wales
33h 52m
1 stop
SEA11:37 amSeattle/Tacoma Intl
$1,120
Delta
Aug 10
SEA5:45 pmSeattle/Tacoma Intl
15h 00m
1 stop
CWL4:45 pmCardiff Wales
Aug 17
CWL9:45 amCardiff Wales
44h 15m
2 stops
SEA10:00 pmSeattle/Tacoma Intl
$1,131

WestJet flights from State of Washington to Cardiff

Our best WestJet deals on State of Washington to Cardiff flight tickets
WestJet
Aug 10
SEA7:35 pmSeattle/Tacoma Intl
54h 40m
2 stops
CWL10:15 amCardiff Wales
Aug 17
CWL11:35 amCardiff Wales
30h 05m
2 stops
SEA9:40 amSeattle/Tacoma Intl
$1,373
WestJet
Aug 10
SEA7:35 pmSeattle/Tacoma Intl
54h 40m
2 stops
CWL10:15 amCardiff Wales
Aug 17
CWL11:35 amCardiff Wales
30h 05m
2 stops
SEA9:40 amSeattle/Tacoma Intl
$1,374
WestJet
Aug 10
SEA7:35 pmSeattle/Tacoma Intl
54h 40m
2 stops
CWL10:15 amCardiff Wales
Aug 17
CWL11:35 amCardiff Wales
54h 05m
2 stops
SEA9:40 amSeattle/Tacoma Intl
$1,404

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 June 26, 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

Mon 8/10

10:30 am-10:50 pm

3 stops28h 20m

Cardiff Wales

Mon 8/17

10:10 pm-10:07 am

3 stops43h 57m

$944

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 8/10

7:10 pm-10:50 pm

1 stop19h 40m

Cardiff Wales

Mon 8/17

10:10 pm-10:07 am

3 stops43h 57m

$976
Quickest round-trip

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 8/10

7:10 pm-10:50 pm

1 stop19h 40m

Cardiff Wales

Mon 8/17

10:10 pm-7:25 pm

2 stops29h 15m

$982

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Thu 8/6

7:10 pm-6:55 am

1 stop27h 45m

Cardiff Wales

Thu 8/13

10:50 pm-9:00 pm

2 stops30h 10m

$1,019

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 8/10

7:10 pm-10:50 pm

1 stop19h 40m

Cardiff Wales

Mon 8/17

10:10 pm-10:07 am

3 stops43h 57m

$1,020

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 8/10

10:30 am-10:50 pm

2 stops28h 20m

Cardiff Wales

Mon 8/17

10:10 pm-10:07 am

3 stops43h 57m

$1,023

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 8/10

7:10 pm-10:50 pm

1 stop19h 40m

Cardiff Wales

Mon 8/17

10:10 pm-7:25 pm

2 stops29h 15m

$1,024

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 8/10

7:10 pm-10:50 pm

1 stop19h 40m

Cardiff Wales

Mon 8/17

10:10 pm-7:25 pm

2 stops29h 15m

$1,025

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 8/10

10:45 am-10:50 pm

3 stops28h 05m

Cardiff Wales

Mon 8/17

10:10 pm-10:07 am

3 stops43h 57m

$1,060

SeattleCardiff

SEA - CWL

SEACWL

Seattle/Tacoma Intl

Mon 8/10

10:30 am-10:50 pm

2 stops28h 20m

Cardiff Wales

Mon 8/17

10:10 pm-10:07 am

3 stops43h 57m

$1,066

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 19 resultsSorted by cheapest first
1
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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

28h 20m

Direct flights

None
The fastest flight from State of Washington to Cardiff takes 28h 20m
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.

Frequently asked questions about flying from Washington to Cardiff

  • How do I get Price Alerts for flights from State of Washington to Cardiff?

    You can take advantage of momondo’s Price Alerts by first searching for your flights to State of Washington from Cardiff. Flight offers will be shown to you in real-time. From there you can create a Price Alert by using our on-site widget.

  • How can I save money on flights from State of Washington to Cardiff with momondo?

    Plan your trips smart with the “Price Forecast” feature, which uses flight data to help you pick the best days to fly for the lowest fares. Our “Price Calendar” helps you get the most for your money by showing you when it’s most advantageous to fly. Curate your own travel experiences for less with “Explore”. Expert travel hacks to fuel your next adventure are a click away with “Discover” by momondo. Set up our “Price Alerts” to track fare changes and book when prices are at their lowest point.

  • How does momondo find its flight prices?

    We show prices from over 700+ competitors with a single click. With options from airlines and OTAs from across our 30 international markets, we are able to show you a diverse range of deals to create your adventure.

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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Aer Lingus