£371 Cheap Flights to King County

View £371 flight on Mon, 18 Jan 2027Opens in a new window

Popular airlines to King County

  • Alaska Airlines

  • Delta

  • American Airlines

  • United

  • Southwest Airlines

  • Frontier Airlines

  • JetBlue Airways

  • Be in the know

    Get alerts if flight prices drop or rise*

  • Book smarter

    Save up to 25% on select hotels after you book a flight*

  • 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 £371 for one-way flights and £495 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Icelandair
Mon, 22 Jun - Mon, 6 Jul
LGW
London
SEA
Seattle
£495 Return, found 3 hours ago
£495
Return
found 3 hours ago
Select Icelandair flight, departing Mon, 22 Jun from London to Seattle, returning Mon, 6 Jul, priced at £495 found 3 hours ago
Icelandair
Sat, 29 Aug - Sun, 6 Sept
LHR
London
SEA
Seattle
£496 Return, found 22 hours ago
£496
Return
found 22 hours ago
Select Icelandair flight, departing Sat, 29 Aug from London to Seattle, returning Sun, 6 Sept, priced at £496 found 22 hours ago
Condor
Thu, 23 Apr - Mon, 27 Apr
LGW
London
SEA
Seattle
£518 Return, just found
£518
Return
just found
Select Condor flight, departing Thu, 23 Apr from London to Seattle, returning Mon, 27 Apr, priced at £518 just found
KLM
Wed, 3 Mar - Mon, 8 Mar
LHR
London
SEA
Seattle
£522 Return, found 5 days ago
£522
Return
found 5 days ago
Select KLM flight, departing Wed, 3 Mar from London to Seattle, returning Mon, 8 Mar, priced at £522 found 5 days ago
Delta
Wed, 3 Mar - Mon, 8 Mar
LHR
London
SEA
Seattle
£522 Return, found 5 days ago
£522
Return
found 5 days ago
Select Delta flight, departing Wed, 3 Mar from London to Seattle, returning Mon, 8 Mar, priced at £522 found 5 days ago
Air France
Wed, 3 Mar - Mon, 8 Mar
LHR
London
SEA
Seattle
£527 Return, found 5 days ago
£527
Return
found 5 days ago
Select Air France flight, departing Wed, 3 Mar from London to Seattle, returning Mon, 8 Mar, priced at £527 found 5 days ago
Virgin Atlantic
Thu, 19 Nov - Thu, 3 Dec
LHR
London
SEA
Seattle
£531 Return, found 5 days ago
£531
Return
found 5 days ago
Select Virgin Atlantic flight, departing Thu, 19 Nov from London to Seattle, returning Thu, 3 Dec, priced at £531 found 5 days ago
Delta
Tue, 23 Jun - Wed, 8 Jul
LHR
London
SEA
Seattle
£532 Return, found 5 days ago
£532
Return
found 5 days ago
Select Delta flight, departing Tue, 23 Jun from London to Seattle, returning Wed, 8 Jul, priced at £532 found 5 days ago
American Airlines
Wed, 16 Sept - Thu, 8 Oct
LHR
London
SEA
Seattle
£539 Return, found 6 days ago
£539
Return
found 6 days ago
Select American Airlines flight, departing Wed, 16 Sept from London to Seattle, returning Thu, 8 Oct, priced at £539 found 6 days ago
Iberia
Wed, 18 Nov - Wed, 25 Nov
LHR
London
SEA
Seattle
£541 Return, found 3 days ago
£541
Return
found 3 days ago
Select Iberia flight, departing Wed, 18 Nov from London to Seattle, returning Wed, 25 Nov, priced at £541 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.

Icelandair
Mon, 22 Jun - Mon, 6 Jul
LGW
London
SEA
Seattle
£495 Return, found 3 hours ago
£495
Return
found 3 hours ago
Select Icelandair flight, departing Mon, 22 Jun from London to Seattle, returning Mon, 6 Jul, priced at £495 found 3 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 £495.
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 £495 and £541. Many lucky travellers nabbed one-way tickets from London (LGW) for only £371.
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.

When is the cheapest time to fly to King County?
If you'd prefer to spend your money experiencing King County rather than on your flight there, depart early in the week. The most cost-effective day to travel is generally Tuesday, with Monday running a close second. With many folks travelling over the weekend, Saturday often has the highest fares.
How much is a plane ticket to King County?
In the last seven days, plane fares to King County varied from £495 to £541.
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.

Travel information

King County Flights Information

Airlines serving
Icelandair, Swiss International Air Lines, Air Canada, Aer Lingus, Lufthansa, JetBlue Airways, Brussels Airlines, Condor, KLM, Delta, Air France, Virgin Atlantic, American Airlines, Iberia
Roundtrip price
from £495
King County Flights Information

Explore a world of travel with Expedia

*Available to Expedia members.