Cheap flights to King County

View €296 flight on Tue, 5 May 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

  • notification illustration

    Be in the know

    Get alerts if flight prices drop or rise*
  • deals illustration

    Book smarter

    Save up to 15% on select hotels after you book a flight*
  • trophy illustration

    Earn twice

    Earn your airline miles on top of our rewards
    Sign in

Cheap round-trip flights to King County

Prices were available within the past 7 days and start at €296 for one-way flights and €380 for round trip, 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 2 hours ago
€380
Return
found 2 hours ago
Select British Airways flight, departing Mon, 2 Feb from Dublin to Seattle, returning Mon, 9 Feb, priced at €380 found 2 hours ago
Icelandair
Thu, 5 Feb - Tue, 24 Feb
LHR
London
SEA
Seattle
€392 Return, found 3 days ago
€392
Return
found 3 days ago
Select Icelandair flight, departing Thu, 5 Feb from London to Seattle, returning Tue, 24 Feb, priced at €392 found 3 days ago
Lufthansa
Wed, 14 Jan - Sun, 18 Jan
LHR
London
SEA
Seattle
€423 Return, found 12 hours ago
€423
Return
found 12 hours ago
Select Lufthansa flight, departing Wed, 14 Jan from London to Seattle, returning Sun, 18 Jan, priced at €423 found 12 hours ago
Aer Lingus
Sun, 8 Mar - Sun, 15 Mar
DUB
Dublin
SEA
Seattle
€428 Return, found 4 hours ago
€428
Return
found 4 hours ago
Select Aer Lingus flight, departing Sun, 8 Mar from Dublin to Seattle, returning Sun, 15 Mar, priced at €428 found 4 hours ago
American Airlines
Mon, 2 Feb - Mon, 9 Feb
DUB
Dublin
SEA
Seattle
€433 Return, found 2 hours ago
€433
Return
found 2 hours ago
Select American Airlines flight, departing Mon, 2 Feb from Dublin to Seattle, returning Mon, 9 Feb, priced at €433 found 2 hours ago
United
Mon, 9 Mar - Mon, 23 Mar
LHR
London
SEA
Seattle
€444 Return, found 4 hours ago
€444
Return
found 4 hours ago
Select United flight, departing Mon, 9 Mar from London to Seattle, returning Mon, 23 Mar, priced at €444 found 4 hours ago
Virgin Atlantic
Mon, 9 Mar - Mon, 23 Mar
LHR
London
SEA
Seattle
€445 Return, found 4 hours ago
€445
Return
found 4 hours ago
Select Virgin Atlantic flight, departing Mon, 9 Mar from London to Seattle, returning Mon, 23 Mar, priced at €445 found 4 hours ago
Delta
Mon, 9 Mar - Mon, 23 Mar
LHR
London
SEA
Seattle
€445 Return, found 4 hours ago
€445
Return
found 4 hours ago
Select Delta flight, departing Mon, 9 Mar from London to Seattle, returning Mon, 23 Mar, priced at €445 found 4 hours ago
Austrian Airlines
Mon, 9 Mar - Mon, 23 Mar
LHR
London
SEA
Seattle
€456 Return, found 4 hours ago
€456
Return
found 4 hours ago
Select Austrian Airlines flight, departing Mon, 9 Mar from London to Seattle, returning Mon, 23 Mar, priced at €456 found 4 hours ago
Brussels Airlines
Mon, 9 Mar - Mon, 23 Mar
LHR
London
SEA
Seattle
€456 Return, found 4 hours ago
€456
Return
found 4 hours ago
Select Brussels Airlines flight, departing Mon, 9 Mar from London to Seattle, returning Mon, 23 Mar, priced at €456 found 4 hours ago

About King County

Expedia offers flights to King County to meet every traveller's needs. Whatever your flight need - Expedia has the flight for you. So choose from flights to King County or destinations around the world and discover how easy it is to make your flight reservations on Expedia.

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 €380.
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 €380 and €456. Many lucky travellers nabbed one-way tickets from Dublin (DUB) for only €296.
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 €380 to €456.
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.

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 2 hours ago
€380
Return
found 2 hours ago
Select British Airways flight, departing Mon, 2 Feb from Dublin to Seattle, returning Mon, 9 Feb, priced at €380 found 2 hours ago
*Available to Expedia members.