SEA - CWL

$1,084 Find Cheap Flights from Seattle to Cardiff - Compare and Save

1 adult
1 adult, Economy, 0 bags

Save 21% or more on flights. Compare deals from all over the web.

Never overpay with our price tracking tools.

Filter searches by price, airline and more to find your best flights.

Everything you should know

Cheapest round-trip
$1,084
Typical prices: $1,088-$1,512
Multiple Airlines
Mon 10/15Mon 10/22
SEA - CWL • 1 stop
Cheapest one-way
$2,335
Typical prices: $421-$1,054
Multiple Airlines
Wed 9/26
SEA - CWL • 3 stops
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Cardiff!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Seattle to Cardiff (SEA-CWL)

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Seattle to Cardiff

Thu, Oct 15 - Thu, Oct 22
Multiple Airlines Logo
7:10 pm - 6:55 amSEA  Seattle/Tacoma Intl-CWL Cardiff Wales
27h 45m1 stop Dublin
Multiple Airlines Logo
10:50 pm - 7:00 pmCWL  Cardiff Wales-SEA Seattle/Tacoma Intl
28h 10m2 stops Dublin London Heathrow
$1,084Multiple Airlines
Thu, Oct 15 - Thu, Oct 22
KLM Logo
5:45 pm - 4:45 pmSEA  Seattle/Tacoma Intl-CWL Cardiff Wales
15h 00m1 stop Amsterdam Schiphol
KLM Logo
9:45 am - 4:35 pmCWL  Cardiff Wales-SEA Seattle/Tacoma Intl
14h 50m1 stop Amsterdam Schiphol
$1,157KLM
Thu, Oct 15 - Thu, Oct 22
KLM Logo
1:42 pm - 4:45 pmSEA  Seattle/Tacoma Intl-CWL Cardiff Wales
19h 03m2 stops Minneapolis St Paul Amsterdam Schiphol
KLM Logo
9:45 am - 11:04 pmCWL  Cardiff Wales-SEA Seattle/Tacoma Intl
21h 19m2 stops Amsterdam Schiphol New York John F Kennedy Intl
$1,171KLM
Thu, Oct 15 - Thu, Oct 22
Multiple Airlines Logo
10:50 am - 10:20 pmSEA  Seattle/Tacoma Intl-CWL Cardiff Wales
27h 30m3 stops Vancouver Intl Toronto Pearson Intl Dublin
Multiple Airlines Logo
12:00 pm - 11:35 amCWL  Cardiff Wales-SEA Seattle/Tacoma Intl
55h 35m2 stops Belfast City London Heathrow
$1,390Multiple Airlines
Sun, Sep 27 - Sun, Oct 4
Multiple Airlines Logo
8:20 pm - 11:30 amSEA  Seattle/Tacoma Intl-CWL Cardiff Wales
31h 10m2 stops London Heathrow Belfast City
Multiple Airlines Logo
12:00 pm - 11:35 amCWL  Cardiff Wales-SEA Seattle/Tacoma Intl
31h 35m2 stops Belfast City London Heathrow
$8,767Multiple Airlines
Sat, Sep 26 - Sun, Oct 4
Multiple Airlines Logo
8:20 pm - 11:30 amSEA  Seattle/Tacoma Intl-CWL Cardiff Wales
31h 10m2 stops London Heathrow Belfast City
Multiple Airlines Logo
12:00 pm - 11:35 amCWL  Cardiff Wales-SEA Seattle/Tacoma Intl
31h 35m2 stops Belfast City London Heathrow
$8,835Multiple Airlines
Sun, Sep 27 - Sun, Oct 4
Multiple Airlines Logo
6:55 pm - 9:15 amSEA  Seattle/Tacoma Intl-CWL Cardiff Wales
30h 20m2 stops Portland Amsterdam Schiphol
Multiple Airlines Logo
9:50 am - 11:52 amCWL  Cardiff Wales-SEA Seattle/Tacoma Intl
34h 02m1 stop Amsterdam Schiphol
$9,519Multiple Airlines
Fri, Sep 25 - Sun, Oct 4
KLM Logo
1:50 pm - 5:05 pmSEA  Seattle/Tacoma Intl-CWL Cardiff Wales
19h 15m1 stop Amsterdam Schiphol
KLM Logo
9:50 am - 11:20 pmCWL  Cardiff Wales-SEA Seattle/Tacoma Intl
21h 30m2 stops Amsterdam Schiphol New York John F Kennedy Intl
$9,629KLM
Tue, Sep 29 - Sun, Oct 4
Delta Logo
5:45 pm - 4:45 pmSEA  Seattle/Tacoma Intl-CWL Cardiff Wales
15h 00m1 stop Amsterdam Schiphol
Delta Logo
9:50 am - 4:35 pmCWL  Cardiff Wales-SEA Seattle/Tacoma Intl
14h 45m1 stop Amsterdam Schiphol
$9,719Delta
Sat, Sep 26 - Sun, Oct 4
Air Europa Logo
6:55 pm - 4:45 pmSEA  Seattle/Tacoma Intl-CWL Cardiff Wales
37h 50m2 stops Portland Amsterdam Schiphol
Air Europa Logo
9:50 am - 4:35 pmCWL  Cardiff Wales-SEA Seattle/Tacoma Intl
14h 45m1 stop Amsterdam Schiphol
$9,845Air Europa
Booking Insights

Price, demand and travel trends for Seattle to Cardiff flights

Use KAYAK data on prices, travel dates, airlines and seasonal trends to compare options and book flights from Seattle to Cardiff with more confidence.

What is the cheapest airline to fly from Seattle to Cardiff?

KLM ($1,157) and Delta ($9,719) are the cheapest airlines to fly round-trip from Seattle to Cardiff according to KAYAK data over the last 5 days.

Find deals

Key details for Seattle to Cardiff flights

Cheapest flight

$1,084
Flight from Seattle to Cardiff

When to book flights from Seattle to Cardiff

Are your dates flexible? Find out the best times to travel from Seattle to Cardiff based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price

Your Seattle to Cardiff flight questions, answered

Find helpful route details based on KAYAK data, including flight times, airports, airlines and booking questions.

  • Which airports can I use when flying from Seattle to Cardiff?

    Flights from Seattle to Cardiff usually depart from Seattle/Tacoma Intl (SEA) and arrive at Cardiff Wales (CWL).

  • What cabin classes can I book on flights from Seattle to Cardiff?

    Only Economy Class is available on flights from Seattle to Cardiff.

  • Which airports do connecting flights from Seattle to Cardiff pass through?

    Most connecting flights from Seattle to Cardiff pass through Amsterdam Schiphol (AMS), which handles 100% of one-stop traffic on this route. Other layover airports each see under 5%.

  • Can I save money by using flexible dates for flights from Seattle to Cardiff?

    Yes. Being flexible with your travel dates can save you up to 29% on the Seattle to Cardiff route. Friday is the cheapest departure day at $1,088 round-trip on average, while Saturday is the most expensive at $1,512, a difference of $424. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

  • Do I need a passport to fly from Seattle to Cardiff?

    Yes, a valid passport is required for this international route. Many destinations require at least six months of validity beyond your travel dates. Check your passport expiry well before booking.

  • How are flight prices from Seattle to Cardiff looking right now?

    One-way fares from Seattle to Cardiff are currently higher than usual. Average one-way flight prices are about $6,413, which is 832% above the typical average for this route.

  • What is the time difference between Seattle and Cardiff?

    Cardiff is 8 hours ahead of Seattle (British Time vs Pacific Time). Plan for the time shift when scheduling connections or first-day activities.

  • What car rental options are available at Cardiff Wales Airport (CWL)?

    Cardiff Wales Airport (CWL) hosts 5 major car rental companies, with daily rates starting from around $15 for economy cars. Top options include:
    · Alamo
    · Budget
    · Enterprise Rent-A-Car
    · Avis
    · National

Your guide to booking Seattle to Cardiff flights

Get tips on when to book, when to fly and what to know before your trip.
  • If your dates can be flexible, aim for a Friday departure instead of Saturday. On this route, Friday flights average $1,088 - about $424 less than Saturday (28% savings) based on the last 12 months.

Everything you need to know for your flight from Seattle to Cardiff

Information on your arrival and departure airports

Seattle (SEA)
Cardiff (CWL)