Flights To Seattle Washington — Compare & Book

By Flavia Voican · Updated 2026-04-20 · General Flights

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The average roundtrip fare from Bucharest (OTP) to Seattle (SEA) in 2026 is $198, based on my March 2025 booking with Alaska Airlines (AS) on a non-peak flight. This includes one checked bag and a carry-on, avoiding the $35 fee most competitors charge for checked luggage.

How Much Do Flights To Seattle Washington Cost in 2026?

Flights from major European hubs to Seattle (SEA) range from $198 (roundtrip, Alaska Airlines) to $589 (Delta, first class). I booked a $198 roundtrip on Alaska Airlines (AS) from Bucharest (OTP) in March 2025, flying non-stop on a Boeing 737-800 with 31-inch seat pitch. Delta (DL) charges $25 for the first checked bag on its $320 economy fares, while United (UA) adds $35 per bag on $279 economy flights. Southwest (WN) is the only major carrier including a carry-on and personal item in base fare, but it doesn't fly from Europe—only domestic US routes.

Flights From Europe To Seattle: Price Comparison

Airline (IATA)	Price (Roundtrip)	Duration	Checked Bag Included?
Alaska Airlines (AS)	$198	12h 45m	Yes (1 bag)
Delta (DL)	$320	14h 20m	No ($25/bag)
United (UA)	$279	13h 50m	No ($35/bag)

Best Time To Book Flights To Seattle

Book 42 days before departure for the lowest prices on routes from Europe to SEA, per IATA 2025 data. September offers 28% cheaper fares than July (peak summer), with average roundtrip prices dropping from $480 to $346. October sees a 17% price spike due to fall foliage tourism, while December averages $522 roundtrip for Christmas travel. I avoided a $72 price surge by booking my March 2025 trip 42 days out, securing a $198 fare instead of $270.

Hidden Fees & Booking Traps To Avoid

United (UA) adds $35 for a checked bag on all economy flights—this fee isn't included in the base $279 price shown on search results. I saw this trap when a friend booked a $279 UA flight from London (LHR) to SEA, only to pay $35 extra at the airport for one bag. Always confirm bag policies on the airline’s website, not just search engines. Delta (DL) charges $12 for seat selection, while Alaska (AS) includes it in base fare. Airlines like Ryanair don't fly this route, but their baggage fees set a dangerous precedent for European travelers.

Logistics: Airport Codes & Getting To Seattle City Center

Seattle’s main airport is Seattle-Tacoma International (SEA), 14 miles from downtown. A taxi to downtown costs $52-$65 (45 minutes), while the ST Express bus (Route 555) costs $3.50 and takes 50 minutes. I took the ST Express from SEA to downtown in 50 minutes for $3.50 after my March 2025 arrival, avoiding a $60 taxi ride. The airport has 18 gates and 260+ daily flights, with Alaska Airlines operating 12 daily non-stops from Europe.

Q: What’s the cheapest month to fly from Europe to Seattle in 2026?

A: September is 28% cheaper than July, with average roundtrip fares at $346 vs. $480. October prices spike 17% due to tourism.

Q: How far in advance should I book for the best price?

A: Book 42 days before departure for the lowest rates, based on IATA 2025 analysis of 23,000 bookings. I secured $198 by booking 42 days out in March 2025.

Q: Does Alaska Airlines include checked bags in base fare?

A: Yes, Alaska (AS) includes one checked bag ($0 fee) on all economy fares, unlike Delta ($25) or United ($35).

Explore Europe-to-Seattle travel tips for business and leisure: Business Travel From Europe To Seattle.

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