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Cheap flights from Washington to Cardiff from $1,084

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Washington to Cardiff departing on 9/5. 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
7:10 pm - 9:20 pmSEA  Seattle/Tacoma Intl-CWL Cardiff Wales
18h 10m1 stop Dublin
Multiple Airlines Logo
11:35 am - 9:40 amCWL  Cardiff Wales-SEA Seattle/Tacoma Intl
30h 05m2 stops Toronto Pearson Intl Calgary
$1,084Multiple Airlines
Sat, Sep 5 - Sat, Sep 12
Multiple Airlines Logo
7:10 pm - 9:20 pmSEA  Seattle/Tacoma Intl-CWL Cardiff Wales
18h 10m1 stop Dublin
Multiple Airlines Logo
11:35 am - 9:40 amCWL  Cardiff Wales-SEA Seattle/Tacoma Intl
30h 05m2 stops Toronto Pearson Intl Calgary
$1,101Multiple Airlines
Sat, Sep 5 - Sat, Sep 12
Delta Logo
12:36 pm - 4:45 pmSEA  Seattle/Tacoma Intl-CWL Cardiff Wales
20h 09m2 stops Los Angeles Los Angeles Amsterdam Schiphol
Delta Logo
9:45 am - 4:35 pmCWL  Cardiff Wales-SEA Seattle/Tacoma Intl
14h 50m1 stop Amsterdam Schiphol
$1,199Delta
Tue, Sep 1 - Tue, Sep 8
Delta Logo
7:15 am - 9:15 amSEA  Seattle/Tacoma Intl-CWL Cardiff Wales
18h 00m2 stops Chicago O'Hare Intl Amsterdam Schiphol
Delta Logo
9:45 am - 9:15 pmCWL  Cardiff Wales-SEA Seattle/Tacoma Intl
19h 30m2 stops Amsterdam Schiphol Atlanta Hartsfield-Jackson
$1,209Delta
Tue, Sep 1 - Tue, Sep 8
Delta Logo
7:15 am - 9:15 amSEA  Seattle/Tacoma Intl-CWL Cardiff Wales
18h 00m2 stops Chicago O'Hare Intl Amsterdam Schiphol
Delta Logo
9:45 am - 10:03 pmCWL  Cardiff Wales-SEA Seattle/Tacoma Intl
20h 18m2 stops Amsterdam Schiphol Boston Logan Intl
$1,219Delta
Sat, Sep 5 - Sat, Sep 12
Delta Logo
3:59 pm - 9:15 amSEA  Seattle/Tacoma Intl-CWL Cardiff Wales
33h 16m2 stops Boston Logan Intl Amsterdam Schiphol
Delta Logo
9:45 am - 4:35 pmCWL  Cardiff Wales-SEA Seattle/Tacoma Intl
14h 50m1 stop Amsterdam Schiphol
$1,225Delta
Fri, Sep 4 - Sat, Sep 12
Delta Logo
3:59 pm - 9:15 amSEA  Seattle/Tacoma Intl-CWL Cardiff Wales
33h 16m2 stops Boston Logan Intl Amsterdam Schiphol
Delta Logo
9:45 am - 11:20 pmCWL  Cardiff Wales-SEA Seattle/Tacoma Intl
21h 35m2 stops Amsterdam Schiphol New York John F Kennedy Intl
$1,229Delta
Fri, Sep 4 - Sat, Sep 12
Delta Logo
5:45 pm - 9:15 amSEA  Seattle/Tacoma Intl-CWL Cardiff Wales
31h 30m1 stop Amsterdam Schiphol
Delta Logo
9:45 am - 4:35 pmCWL  Cardiff Wales-SEA Seattle/Tacoma Intl
14h 50m1 stop Amsterdam Schiphol
$1,236Delta
Fri, Sep 4 - Fri, Sep 11
Air France Logo
1:50 pm - 5:05 pmSEA  Seattle/Tacoma Intl-CWL Cardiff Wales
19h 15m1 stop Amsterdam Schiphol
Air France Logo
9:45 am - 4:27 pmCWL  Cardiff Wales-SEA Seattle/Tacoma Intl
14h 42m1 stop Amsterdam Schiphol
$1,244Air France
Fri, Aug 21 - Fri, Aug 28
Delta Logo
5:45 pm - 9:15 amSEA  Seattle/Tacoma Intl-CWL Cardiff Wales
31h 30m1 stop Amsterdam Schiphol
Delta Logo
9:45 am - 4:35 pmCWL  Cardiff Wales-SEA Seattle/Tacoma Intl
14h 50m1 stop Amsterdam Schiphol
$1,249Delta
Sat, Sep 5 - Sat, Sep 12

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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
Sep 1
SEA12:36 pmSeattle/Tacoma Intl
20h 09m
2 stops
CWL4:45 pmCardiff Wales
Sep 8
CWL9:45 amCardiff Wales
14h 50m
1 stop
SEA4:35 pmSeattle/Tacoma Intl
$1,199
Delta
Sep 1
SEA7:15 amSeattle/Tacoma Intl
18h 00m
2 stops
CWL9:15 amCardiff Wales
Sep 8
CWL9:45 amCardiff Wales
14h 50m
1 stop
SEA4:35 pmSeattle/Tacoma Intl
$1,200
Delta
Sep 1
SEA7:15 amSeattle/Tacoma Intl
18h 00m
2 stops
CWL9:15 amCardiff Wales
Sep 8
CWL9:45 amCardiff Wales
19h 30m
2 stops
SEA9:15 pmSeattle/Tacoma Intl
$1,209

KLM flights from State of Washington to Cardiff

Our best KLM deals on State of Washington to Cardiff flight tickets
KLM
Sep 1
SEA1:50 pmSeattle/Tacoma Intl
18h 55m
1 stop
CWL4:45 pmCardiff Wales
Sep 8
CWL9:45 amCardiff Wales
14h 50m
1 stop
SEA4:35 pmSeattle/Tacoma Intl
$1,322
KLM
Sep 1
SEA1:50 pmSeattle/Tacoma Intl
18h 55m
1 stop
CWL4:45 pmCardiff Wales
Sep 8
CWL9:45 amCardiff Wales
14h 50m
1 stop
SEA4:35 pmSeattle/Tacoma Intl
$1,447
KLM
Sep 5
SEA1:50 pmSeattle/Tacoma Intl
18h 55m
1 stop
CWL4:45 pmCardiff Wales
Sep 12
CWL9:45 amCardiff Wales
14h 50m
1 stop
SEA4:35 pmSeattle/Tacoma Intl
$1,724

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 August 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 Seattle/Tacoma Intl - CWL Cardiff Wales

SEACWL

Seattle/Tacoma Intl

Sat 9/5

7:10 pm-9:20 pm

1 stop18h 10m

Cardiff Wales

Sat 9/12

11:35 am-9:40 am

2 stops30h 05m

$1,084

SeattleCardiff

SEA Seattle/Tacoma Intl - CWL Cardiff Wales

SEACWL

Seattle/Tacoma Intl

Sat 9/5

7:10 pm-9:20 pm

1 stop18h 10m

Cardiff Wales

Sat 9/12

11:35 am-9:40 am

2 stops30h 05m

$1,101

SeattleCardiff

SEA Seattle/Tacoma Intl - CWL Cardiff Wales

SEACWL

Seattle/Tacoma Intl

Tue 9/1

12:36 pm-4:45 pm

2 stops20h 09m

Cardiff Wales

Tue 9/8

9:45 am-4:35 pm

1 stop14h 50m

$1,199

SeattleCardiff

SEA Seattle/Tacoma Intl - CWL Cardiff Wales

SEACWL

Seattle/Tacoma Intl

Tue 9/1

7:15 am-9:15 am

2 stops18h 00m

Cardiff Wales

Tue 9/8

9:45 am-9:15 pm

2 stops19h 30m

$1,209

SeattleCardiff

SEA Seattle/Tacoma Intl - CWL Cardiff Wales

SEACWL

Seattle/Tacoma Intl

Sat 9/5

7:15 am-9:15 am

2 stops18h 00m

Cardiff Wales

Sat 9/12

9:45 am-10:03 pm

2 stops20h 18m

$1,219

SeattleCardiff

SEA Seattle/Tacoma Intl - CWL Cardiff Wales

SEACWL

Seattle/Tacoma Intl

Fri 9/4

3:59 pm-9:15 am

2 stops33h 16m

Cardiff Wales

Sat 9/12

9:45 am-4:35 pm

1 stop14h 50m

$1,225

SeattleCardiff

SEA Seattle/Tacoma Intl - CWL Cardiff Wales

SEACWL

Seattle/Tacoma Intl

Fri 9/4

3:59 pm-9:15 am

2 stops33h 16m

Cardiff Wales

Sat 9/12

9:45 am-11:20 pm

2 stops21h 35m

$1,229

SeattleCardiff

SEA Seattle/Tacoma Intl - CWL Cardiff Wales

SEACWL

Seattle/Tacoma Intl

Fri 9/4

5:45 pm-9:15 am

1 stop31h 30m

Cardiff Wales

Fri 9/11

9:45 am-4:35 pm

1 stop14h 50m

$1,236
Quickest round-trip

SeattleCardiff

SEA Seattle/Tacoma Intl - CWL Cardiff Wales

SEACWL

Seattle/Tacoma Intl

Fri 8/21

1:50 pm-5:05 pm

1 stop19h 15m

Cardiff Wales

Fri 8/28

9:45 am-4:27 pm

1 stop14h 42m

$1,244

SeattleCardiff

SEA Seattle/Tacoma Intl - CWL Cardiff Wales

SEACWL

Seattle/Tacoma Intl

Sat 9/5

5:45 pm-9:15 am

1 stop31h 30m

Cardiff Wales

Sat 9/12

9:45 am-4:35 pm

1 stop14h 50m

$1,249

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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

18h 10m

Direct flights

None
The fastest flight from State of Washington to Cardiff takes 18h 10m
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.

Traveling to a place near Cardiff?

Book flights to Cardiff if you plan to visit one of these locations
Bridgend

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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Cabin classes currently available on flights to Cardiff

List of cabin classes available on flights landing in Cardiff. Availability may vary depending on flight origin and airline.
First Class to Cardiff
Business Class to Cardiff