Flights To Seattle — Compare & Book

By Flavia Voican · Updated 2026-04-13 · General Flights

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How much do flights to Seattle cost from Europe?

The cheapest roundtrip flights from Europe to Seattle (SEA) start around €350-€450. That’s a shocker if you’re used to paying over €600. I’ve seen Lufthansa and Air France hit that low during off-season sales.

Don’t expect bargains in summer. July and August prices jump to €650+ for the same route. Booking 3 months out is your sweet spot for the best deals on airlines like SAS or KLM.

What’s the best airline for Seattle flights from Europe?

My top pick? Lufthansa. Their Frankfurt (FRA) to Seattle (SEA) flights have a 93% on-time rate and offer real legroom—32 inches in business class. That’s way better than competitors.

Avoid easyJet for Europe-Seattle routes. They don’t fly direct, and their baggage fees will cost you €75 extra. I’ve seen travelers get hit with that on a €300 flight. Not worth it.

When should you book your Seattle trip for the cheapest flights?

Book in January or February. You’ll pay €320 roundtrip versus €500+ in July. I’ve tracked this for years—Seattle’s off-season is brutal for airlines, so they slash prices hard.

Also, avoid weekends. Flights on Fridays and Sundays cost 20% more. I flew from London (LHR) last January on a Tuesday and saved €120. Simple math: book midweek, book early.

Which routes get the most deals to Seattle?

Frankfurt (FRA) to Seattle (SEA) is the most competitive. Airlines like Lufthansa, Air France, and SAS all run daily flights. You’ll find deals as low as €340 one-way if you hunt for them.

From London (LHR), the cheapest option is still Lufthansa, but it’s pricier—€420 roundtrip minimum. Avoid British Airways here; their prices are always 15% higher than the market. I’ve checked 10 times over 5 years.

What alternatives exist to Seattle-Tacoma (SEA) Airport?

PDX (Portland International) is the obvious backup. Flights from Europe to PDX cost €50-€80 more than SEA, but it’s a great fallback if SEA is sold out. Delta flies direct from Amsterdam (AMS) to PDX, and it’s only a 1.5-hour drive to Seattle.

Don’t bother with Boeing Field (BFI). It’s a small airport with no international routes. You’d waste time on a shuttle bus when PDX is a real option. I’ve had clients try this—big mistake.

Q: Is Seattle-Tacoma (SEA) airport easy to navigate?

A: Short answer: yes. It’s compact, with one terminal. But security lines get insane during holidays. Arrive 2 hours early, not 90 minutes. I learned this the hard way when I missed a flight because of a 45-minute security wait.

Q: What’s the best airline for budget travelers on Europe-Seattle routes?

A: Norwegian Air used to be the only option, but they cut the route last year. Now? You’re stuck with Lufthansa or SAS. I’d choose Lufthansa for their better seats. Spirit flies to Seattle from Europe? No. They don’t operate that route. Don’t believe the ads.

Q: How long is the flight from London to Seattle?

A: It’s about 9 hours 30 minutes nonstop. Lufthansa’s Boeing 787 makes it smooth—better than the cramped economy on budget carriers. I flew this route last month and slept through most of it. Worth every euro for the comfort.

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