Cheap flights to King County

View €63 flight on Thu, 28 May 2026Opens in a new window

Popular airlines to King County

  • Alaska Airlines

  • Delta

  • American Airlines

  • United

  • Southwest Airlines

  • Frontier Airlines

  • JetBlue Airways

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Cheap round-trip flights to King County

Prices were available within the past 7 days and start at €63 for one-way flights and €123 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Thu, 28 May - Sun, 31 May
SFO
San Francisco
SEA
Seattle
€123 Return, found 5 days ago
€123
Return
found 5 days ago
Select Delta flight, departing Thu, 28 May from San Francisco to Seattle, returning Sun, 31 May, priced at €123 found 5 days ago
Delta
Thu, 28 May - Sun, 31 May
SFO
San Francisco
SEA
Seattle
€127 Return, found 5 days ago
€127
Return
found 5 days ago
Select Delta flight, departing Thu, 28 May from San Francisco to Seattle, returning Sun, 31 May, priced at €127 found 5 days ago
United
Thu, 28 May - Sun, 31 May
SFO
San Francisco
SEA
Seattle
€153 Return, found 5 days ago
€153
Return
found 5 days ago
Select United flight, departing Thu, 28 May from San Francisco to Seattle, returning Sun, 31 May, priced at €153 found 5 days ago
Delta
Thu, 28 May - Sun, 31 May
SFO
San Francisco
SEA
Seattle
€156 Return, found 5 days ago
€156
Return
found 5 days ago
Select Delta flight, departing Thu, 28 May from San Francisco to Seattle, returning Sun, 31 May, priced at €156 found 5 days ago
Delta
Thu, 28 May - Sun, 31 May
SFO
San Francisco
SEA
Seattle
€157 Return, found 5 days ago
€157
Return
found 5 days ago
Select Delta flight, departing Thu, 28 May from San Francisco to Seattle, returning Sun, 31 May, priced at €157 found 5 days ago
Delta
Wed, 24 Jun - Tue, 7 Jul
SAN
San Diego
SEA
Seattle
€158 Return, found 1 day ago
€158
Return
found 1 day ago
Select Delta flight, departing Wed, 24 Jun from San Diego to Seattle, returning Tue, 7 Jul, priced at €158 found 1 day ago
Delta
Sat, 6 Jun - Mon, 8 Jun
LAS
Las Vegas
SEA
Seattle
€160 Return, found 3 days ago
€160
Return
found 3 days ago
Select Delta flight, departing Sat, 6 Jun from Las Vegas to Seattle, returning Mon, 8 Jun, priced at €160 found 3 days ago
American Airlines
Sat, 6 Jun - Sun, 7 Jun
LAX
Los Angeles
SEA
Seattle
€177 Return, found 6 days ago
€177
Return
found 6 days ago
Select American Airlines flight, departing Sat, 6 Jun from Los Angeles to Seattle, returning Sun, 7 Jun, priced at €177 found 6 days ago
Alaska Airlines
Sat, 6 Jun - Mon, 8 Jun
LAS
Las Vegas
PAE
Seattle
€453 Return, found 3 days ago
€453
Return
found 3 days ago
Select Alaska Airlines flight, departing Sat, 6 Jun from Las Vegas to Seattle, returning Mon, 8 Jun, priced at €453 found 3 days ago
JetBlue Airways
Sat, 6 Jun - Mon, 8 Jun
LAS
Las Vegas
SEA
Seattle
€535 Return, found 3 days ago
€535
Return
found 3 days ago
Select JetBlue Airways flight, departing Sat, 6 Jun from Las Vegas to Seattle, returning Mon, 8 Jun, priced at €535 found 3 days 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.

Finnair
Fri, 19 Jun - Thu, 25 Jun
DUB
Dublin
SEA
Seattle
€507 Return, found 1 day ago
€507
Return
found 1 day ago
Select Finnair flight, departing Fri, 19 Jun from Dublin to Seattle, returning Thu, 25 Jun, priced at €507 found 1 day 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 €123.
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 €123 and €535. Many lucky travellers nabbed one-way tickets from San Francisco (SFO) for only €63.
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 €123 to €535.
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

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.
About King County
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