Cheap flights from Dublin to Seattle

November comes in as the cheapest month to fly this pairing, so start there when your dates are flexible. The rest of the year has a shape: quiet shoulder seasons in spring and autumn, a summer stretch when the Pacific Northwest draws its heaviest visitor traffic, and the Christmas and New Year weeks, which fill early at both ends of the journey. Midweek departures tend to sit under weekend ones, and moving a connection by a day can change the fare as much as changing the trip itself. Every month of the year carries prices here, so scan the full calendar before you settle on dates.

The mix leans full-service: Aer Lingus, British Airways, Iberia, American Airlines, Air Canada, Lufthansa, Turkish Airlines and TAP Portugal sell the pairing as connecting itineraries, with meals, a seat and a baggage allowance typically built into the fare. JetBlue Airways and WestJet come from the low-cost side, where extras are priced separately and the fare grows once a checked bag is added. Nothing operates this pair nonstop, so every carrier adds a change of plane en route, and that connection is where they truly differ: total journey time, how tight the transfer is and what protection you hold if a leg is delayed. Weigh the whole itinerary, not just the fare.

Plan on an evening arrival: after a connection and the time change, itineraries on this route tend to reach Seattle–Tacoma International late in the day, which narrows your options for the ride into town. The airport sits well south of downtown, so the last stretch needs a plan — a light-rail line runs from the terminal to the centre, and taxis, rideshares and rental cars cover the rest. Land after the trains have thinned out and the road still works, though evening traffic can stretch it. Where you change planes also matters: US entry formalities may fall at the connection rather than in Seattle, so leave slack in the layover.

Currency

USD ($)

Power sockets

Type A, B · 120 V

Language

Samoan, Hawaiian, Chamorro, Carolinian, Spanish

Emergency number

911

Driving side

right

Calling code

+1

Internet domain

.us

Population of Seattle

737 k (2020)

Time zone

UTC-07 (America/Los_Angeles)

Country facts: Wikidata

• Sort documents first: most visitors to the United States need an approved ESTA or a visa, plus a passport valid past your return.
• Every itinerary here includes a connection, so check the layover airport and the time it leaves you.
• On separate tickets the second airline owes you little if the first leg runs late, so a through-ticket is safer.
• Low-cost fares with JetBlue Airways or WestJet can exclude checked bags, so price the bag into the comparison.
• November sits at the low end of the price calendar, with summer and the Christmas weeks at the other.
• Both ends are single-airport, so you depart from Dublin Airport and land at Seattle–Tacoma International with no alternative to weigh.