Cheap flights from Cardiff, United Kingdom to Seattle, WA
Flights starting at £302. Choose between Alaska Airlines, easyJet, or KLM Royal Dutch Airlines to find the best price.
Make your travel wishlist, we'll do the rest
Hidden deals
Kiwi-Code uncovers prices airlines don't want you to see.
Effortless booking
Use our flexible filters to tailor your search.
Travel hacking
Look out for the travel hack star icon for even cheaper fares.
Tips to know when travelling to Seattle
Cheapest one-way trip | £325 |
---|---|
Cheapest round-trip | £717 |
Average round-trip | £817 |
Includes rare itinerary | |
Most popular airline | Alaska Airlines |
Search by stops
- Nonstop
- Up to 1 stop
- Up to 2 stops
Search by carrier
Search by price
Search by departure date
Receive exclusive deals by email
By subscribing you agree to receive offers according to the conditions described in our Privacy Policy.
Book your trip to arrive at Seattle–Tacoma International, or Kenmore Air Harbor Seaplane Base. The most popular airlines for this route are Alaska Airlines, easyJet, KLM Royal Dutch Airlines, Air France, and Aer Lingus. Cardiff and Seattle have 366 direct flights per week.
Check-in for a flight from Cardiff to Seattle
Name | Carrier code | IATA Code | Passport needed during booking | Online check-in available |
---|---|---|---|---|
Alaska Airlines | ASA | AS | No | Opens 24 days before flight Closes 1 hours before flight |
easyJet | EZY | U2 | No | Opens 720 days before flight Closes 2 hours before flight |
KLM Royal Dutch Airlines | KLM | KL | No | Opens 30 days before flight Closes 1 hours before flight |
Air France | AFR | AF | No | Opens 30 days before flight Closes 1 hours before flight |
Aer Lingus | EIN | EI | No | Opens 48 days before flight Closes 5 hours before flight |
Weather in Seattle
Average Weather
Month | Average monthly max temperature | Average monthly min temperature |
January | 7°C | 2°C |
February | 8°C | 1°C |
March | 10°C | 3°C |
April | 13°C | 4°C |
May | 18°C | 8°C |
June | 21°C | 10°C |
July | 25°C | 13°C |
August | 26°C | 14°C |
September | 22°C | 11°C |
October | 15°C | 7°C |
November | 10°C | 4°C |
December | 6°C | 1°C |
14 day forecast
Frequently asked questions
Planning a trip? Thanks to our Virtual Interlining algorithm, we offer billions of route combinations between any A and any B in the world by plane, train, and bus. Find the cheapest routes and best deals for you, as well as the best dates on which to travel.
Explore alternative trips
Flights from Cardiff
- Flights from Cardiff to Málaga
- Flights from Cardiff to Faro
- Flights from Cardiff to Barcelona
- Flights from Cardiff to Amsterdam
- Flights from Cardiff to Edinburgh
- Flights from Cardiff to Dublin
- Flights from Cardiff to Tenerife
- Flights from Cardiff to Glasgow
- Flights from Cardiff to Palma, Majorca
- Flights from Cardiff to Istanbul
- Flights from Cardiff to Madrid
- Flights from Cardiff to London
- Flights from Cardiff to Alicante
- Flights from Cardiff to Belfast
- Flights from Cardiff to Ibiza
- Flights from Cardiff to Paris
- Flights from Cardiff to Athens
- Flights from Cardiff to New York
- Flights from Cardiff to Lanzarote
- Flights from Cardiff to Las Palmas
Flights to Seattle
- Flights from London to Seattle
- Flights from Dublin to Seattle
- Flights from Manila to Seattle
- Flights from Bangkok to Seattle
- Flights from Tallinn to Seattle
- Flights from Detroit to Seattle
- Flights from New York to Seattle
- Flights from Manchester to Seattle
- Flights from Melbourne to Seattle
- Flights from Los Angeles to Seattle
- Flights from Chicago to Seattle
- Flights from Paris to Seattle
- Flights from Denver to Seattle
- Flights from Hong Kong to Seattle
- Flights from Washington, D.C. to Seattle
- Flights from Toronto to Seattle
- Flights from Denpasar to Seattle
- Flights from Atlanta to Seattle
- Flights from Dallas to Seattle
- Flights from San Salvador to Seattle
Popular routes
- Flights from Bangkok to Chiang Mai
- Flights from Lucknow to Chișinău
- Flights from London to New York
- Flights from Minot to Trujillo
- Flights from Panama to Laayoune
- Flights from İzmir to Saint Lucia
- Flights from Pekanbaru to Nairobi
- Flights from Trabzon to Mombasa
- Flights from Tortola to Ibiza
- Flights from Baltra Island to Wrocław
- Flights from Tucson to Zhengzhou
- Flights from Cuenca to Lusaka
- Flights from Apartadó to Kisumu