Cheap flights to King County

View €50 flight on Sun, 18 Jan 2026Opens in a new window

Popular airlines to King County

  • Alaska Airlines

    Alaska Airlines

  • Delta

    Delta

  • American Airlines

    American Airlines

  • United

    United

  • Southwest Airlines

    Southwest Airlines

  • Frontier Airlines

    Frontier Airlines

  • Air Canada

    Air Canada

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Cheap round-trip flights to King County

Prices were available within the past 7 days and start at €50 for one-way flights and €79 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Thu, 5 Feb - Thu, 5 Feb
SFO
San Francisco
SEA
Seattle
€79 Return, found 3 days ago
€79
Return
found 3 days ago
Select Delta flight, departing Thu, 5 Feb from San Francisco to Seattle, returning Thu, 5 Feb, priced at €79 found 3 days ago
Delta
Sat, 17 Jan - Sun, 18 Jan
LAX
Los Angeles
SEA
Seattle
€125 Return, found 10 hours ago
€125
Return
found 10 hours ago
Select Delta flight, departing Sat, 17 Jan from Los Angeles to Seattle, returning Sun, 18 Jan, priced at €125 found 10 hours ago
American Airlines
Thu, 22 Jan - Sun, 25 Jan
LAX
Los Angeles
SEA
Seattle
€134 Return, found 2 days ago
€134
Return
found 2 days ago
Select American Airlines flight, departing Thu, 22 Jan from Los Angeles to Seattle, returning Sun, 25 Jan, priced at €134 found 2 days ago
United
Thu, 22 Jan - Sun, 25 Jan
SFO
San Francisco
SEA
Seattle
€160 Return, found 19 hours ago
€160
Return
found 19 hours ago
Select United flight, departing Thu, 22 Jan from San Francisco to Seattle, returning Sun, 25 Jan, priced at €160 found 19 hours ago
American Airlines
Sat, 17 Jan - Sun, 18 Jan
LAX
Los Angeles
PAE
Seattle
€269 Return, found 10 hours ago
€269
Return
found 10 hours ago
Select American Airlines flight, departing Sat, 17 Jan from Los Angeles to Seattle, returning Sun, 18 Jan, priced at €269 found 10 hours ago
American Airlines
Thu, 22 Jan - Sun, 25 Jan
SFO
San Francisco
PAE
Seattle
€291 Return, found 19 hours ago
€291
Return
found 19 hours ago
Select American Airlines flight, departing Thu, 22 Jan from San Francisco to Seattle, returning Sun, 25 Jan, priced at €291 found 19 hours ago
British Airways
Mon, 2 Feb - Mon, 9 Feb
DUB
Dublin
SEA
Seattle
€380 Return, found 4 hours ago
€380
Return
found 4 hours ago
Select British Airways flight, departing Mon, 2 Feb from Dublin to Seattle, returning Mon, 9 Feb, priced at €380 found 4 hours ago
Aer Lingus
Sun, 8 Mar - Sun, 15 Mar
DUB
Dublin
SEA
Seattle
€428 Return, found 6 hours ago
€428
Return
found 6 hours ago
Select Aer Lingus flight, departing Sun, 8 Mar from Dublin to Seattle, returning Sun, 15 Mar, priced at €428 found 6 hours ago
Scandinavian Airlines
Thu, 21 May - Tue, 2 Jun
DUB
Dublin
SEA
Seattle
€464 Return, found 8 hours ago
€464
Return
found 8 hours ago
Select Scandinavian Airlines flight, departing Thu, 21 May from Dublin to Seattle, returning Tue, 2 Jun, priced at €464 found 8 hours ago
Iberia
Sat, 5 Sept - Tue, 15 Sept
DUB
Dublin
SEA
Seattle
€477 Return, found 1 day ago
€477
Return
found 1 day ago
Select Iberia flight, departing Sat, 5 Sept from Dublin to Seattle, returning Tue, 15 Sept, priced at €477 found 1 day ago

Trending flights to King County

These prices were available within the past 7 days. Prices quoted are per person, return, for the period specified. Prices and availability are subject to change. Additional terms apply.

British Airways
Mon, 2 Feb - Mon, 9 Feb
DUB
Dublin
SEA
Seattle
€380 Return, found 4 hours ago
€380
Return
found 4 hours ago
Select British Airways flight, departing Mon, 2 Feb from Dublin to Seattle, returning Mon, 9 Feb, priced at €380 found 4 hours ago

Frequently asked questions

How do I find cheap flights to King County that have flexible change policies?
We know that things can change in the blink of an eye, so locking in a flexible ticket with Expedia is always a clever idea. Tick the "No change fee" box underneath the "Flexible change policies" filter. Your low-cost, flexible flight to King County is only a few clicks away.
Which airlines fly to King County?
When you're ready to book your ticket to or near King County, these carriers look forward to welcoming you on board:

  • Alaska Airlines - 8,781 flights to or near King County each month, including 8,781 flights to Seattle - Tacoma Intl. Airport (SEA) per month.
  • Delta Air Lines - 4,186 flights to or near King County each month, including 4,186 flights to Seattle - Tacoma Intl. Airport (SEA) per month.
  • United Airlines - 828 flights to or near King County each month, including 828 flights to Seattle - Tacoma Intl. Airport (SEA) per month.

How can I find cheap tickets to King County?
Book in advance, fly in or out of nearby airports, avoid peak travel periods — there are plenty of ways! One more is to take advantage of Expedia's "flexible dates" feature. Search for your King County flight, then compare the prices for nearby dates. In the last seven days, the best price for a flight to King County was €79.
How much is a flight to King County?
There were plenty of affordable fares for the taking in the last seven days, with the price of a return flight to King County ranging between €79 and €517. Many lucky travellers nabbed one-way tickets from San Francisco (SFO) for only €50.
What are the most popular airports to fly into in King County?
Depending on which carrier you travel with and departure city, one of these leading airports will be your entry point to King County:

  • Seattle - Tacoma Intl. Airport (SEA) - 15,456 flights per month.
  • Boeing Field Airport (BFI) - 247 flights per month.

How much is a plane ticket to King County?
In the last seven days, plane fares to King County varied from €79 to €517.
What is the best time to go to King County?
A terrific time to check out Seattle is after June 20 when summer starts. In King County's most populated city, temperatures range from 13ºC to 24ºC during this time — glorious weather for touring around! March, April and May are the most popular months for tourists.
What months are the cheapest to book a flight to King County?
February is the cheapest month to reserve a seat for your King County adventure. Airfares cost the most over the festive month of December, so steer clear of this time if possible.

Book with confidence

About King County

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About King County

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