Airports in King County, Washington
King County, Washington is home to one of the busiest and most strategically important airport networks in the Pacific Northwest. With a population of more than 2.3 million residents across 2,130 square miles — making it the most populous county in Washington State — King County's aviation infrastructure serves millions of travelers, cargo operators, and general aviation pilots every year. From the region's international gateway to smaller general aviation fields, the county offers a comprehensive range of air travel options for residents and visitors alike.
Seattle-Tacoma International Airport (SEA)
The crown jewel of King County's aviation network is Seattle-Tacoma International Airport, universally known by its IATA code SEA. Located approximately 14 miles south of downtown Seattle near the city of SeaTac, this world-class facility set an all-time passenger record in 2025 with 52,715,181 passengers — a testament to the region's growing economic and cultural significance on the global stage.
SEA operates from a single main terminal with four concourses — A, B, C, and D — plus North and South satellite terminals connected by an automated people mover system. The airport is served by 31 airlines offering 91 domestic routes and 28 international destinations spanning North America, Europe, the Middle East, Asia, and Oceania. Alaska Airlines, headquartered near the airport, uses SEA as its primary hub and accounts for a significant share of all operations. Delta Air Lines also maintains a major hub presence here, with additional service from United, American, Emirates, Lufthansa, All Nippon Airways, and many others.
From downtown Seattle, travelers can reach SEA in approximately 38 minutes via the Sound Transit Link light rail — one of the most convenient airport transit connections in the country. By car or rideshare, the journey typically takes 30 to 45 minutes depending on traffic. The airport's central location in King County ensures it is accessible from communities across the county, from Bellevue and Redmond to Renton and Auburn.
Boeing Field / King County International Airport (BFI)
Just 5 miles south of downtown Seattle sits Boeing Field, officially known as King County International Airport and designated by IATA code BFI. Founded in 1928 and named in honor of William E. Boeing — the founder of the Boeing Company — this historic airfield served as Seattle's primary commercial airport until Seattle-Tacoma International opened in 1944. Today, BFI is one of the busiest general aviation airports in the United States.
Owned and operated by King County, Boeing Field hosts a diverse range of aviation activity. UPS Airlines uses BFI as a major cargo hub, handling freight distribution throughout the Pacific Northwest. Kenmore Air provides scheduled commuter passenger service connecting King County to destinations across the San Juan Islands and British Columbia. The airport also features a U.S. Customs and Border Protection biometric facility, enabling international general aviation arrivals. Corporate jets, helicopters, flight training, and military aircraft all make regular use of the field's two runways.
Other King County Airports
Beyond SEA and BFI, King County is home to more than a dozen additional airports and aviation facilities. Renton Municipal Airport (KRNT), situated on the southern shore of Lake Washington, serves general aviation traffic and is historically significant as a former Boeing manufacturing site. Auburn Municipal Airport (S50) supports recreational and training flights in the southern part of the county. Kenmore Air Harbor on the northern shore of Lake Washington operates as a seaplane base offering scenic float plane flights to destinations throughout Puget Sound and the Pacific Northwest. Vashon Municipal Airport (2S1) provides air access to Vashon Island, where no ferry service is available for aircraft.
Additional facilities include Bellevue Airfield, Fall City Airport, Skykomish State Airport, and several ultralight and specialty fields scattered across King County's diverse terrain — from the urban core to the forested foothills of the Cascade Range.
Whether you are a commercial traveler connecting to international destinations, a cargo shipper relying on freight services, or a private pilot exploring the region's spectacular scenery, King County's airport system provides the facilities and services to meet your aviation needs.
International Airports
An international airport is a vital component of any major metropolitan area. It connects domestic and international travelers, providing them with a means to connect to the rest of the world.
An international airport is a large airport that is equipped to handle both domestic and international flights. It also has a significant economic impact on the local community.
These major Washington Airports generate thousands of jobs and contribute billions of dollars to the local economy through tourism and other related industries.
A large international airport also offers a variety of amenities for travelers. These can include shopping centers, dining options, lounges, and other services such as currency exchange and luggage storage.
Boeing Field/King County International Airport - Bfi
Seattle Tacoma International Airport - Sea
Private Airports
Private airports, also known as general aviation airports, are airports that are not open to commercial airlines and are used primarily by private aircraft.
One of the main benefits of a private airport is the exclusivity and privacy it offers.
These airports are often used by high-profile individuals, such as celebrities and business executives, who value their privacy and want to avoid the crowds and security lines of commercial airports.
Private airports also offer more flexibility and convenience for aircraft owners. They can also be used for training pilots and hosting aviation events.
There are 0 Private Airport in King County, Washington.
Regional Airports
Regional airports are smaller airports that serve a rural geographic region, such as a smaller city or county with a population of less than 100,000.
Small airports mostly offer flights within the same country, but some may offer flights to nearby countries.
One of the main advantages of regional airports is their convenience. They also tend to have shorter security lines and fewer crowds, making the overall travel experience more enjoyable.
There are 0 Regional Airport in King County, Washington.
Municipal Airports
Municipal airports which are also called "public airports" are owned and run by local governments like cities and counties.
Most of the time, they are smaller airports that serve a certain area and have mostly domestic flights, but some may also have flights to nearby countries.
One of the main advantages of municipal airports is their accessibility. They are often located in or near major cities, making them a convenient option for travelers.
Municipal airports provide a vital link for businesses in the region, allowing them to easily connect to other parts of the country.
There are 3 Municipal Airport in King County, Washington.
Vashon Municipal Airport
Auburn Municipal Airport
Renton Municipal Airport
Local Airports
There are 19 Local Airport in King County, Washington.