Seattle–Tacoma International Airport

Compiled by Bill Gao

Seattle, Washington (United States)

IATA: SEA ICAO: KSEA

Longest Active Runway

11,901 ft

3,627 meters

Field Elevation

433 ft

132 m MSL

Runway Inventory

3 active

1 closed, Lighted / Paved

Coordinates & Class

47.4479°, -122.3103°

LARGE AIRPORT

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Multi-Universe Rankings & Statistical Standing

How ranks work →

RunwayFacts Published Dataset

#209 of 650

In curated primary commercial index

Global Commercial Universe

#333 of 7558

Top 4.4% percentile worldwide

National Standing (United States)

#24 of 63 in US

#76 of 2020 in full national registry

vs Large Airport Median

+19%

Compared to 10,000 ft baseline

💡 SEA in numbers: 11,901 ft longest runway · #209 of 650 published · #333 of 7,558 worldwide (top 4.4%) · #24 in United States.

🔬 Operational & Aerodrome Engineering Comparative Analysis

Longest runway ≥10,500 ft

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Elevation & National Context

Lowland Aerodrome (<2,000 ft)

SEA lies at 132 m (433 ft), #290 of 650 published airports by elevation and 49.1 percentile among 7,558 worldwide. It is 174 ft below the United States median (607 ft, 63 airports); COS is highest at 6,187 ft, 5,754 ft higher than SEA.

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Regional Density & Alternates (100 NM)

0 Qualifying Aerodromes in Vicinity

No published neighbour with a paved runway of 5,000 ft or more within 100 NM of SEA. Nearest published airport: Vancouver International Airport (YVR), 110 NM, 11,500 ft (401 ft shorter than SEA); 3 within 250 NM.

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Runway Inventory & National Standing

Primary Runway: 11,901 ft (3,627 m)

SEA runways: 16L/34R 11,901 × 150 ft permanent paved (pem); 16C/34C 9,426 × 150 ft permanent paved (pem); 16R/34L 8,500 × 150 ft permanent paved (pem). National standing: #24 of 63 in United States; DEN leads by 4,099 ft (16,000 ft). +19% vs the 10,000 ft baseline.

🛫 Physical Runway Inventory & Surface Engineering

Runway Designator	Length (ft / m)	Width (ft / m)	Surface Material	Lighting	Status
16L/34R	11,901 ft (3627 m / 3.627 km)	150 ft (46m)	`Permanent Paved (PEM)`	✅ Lighted	✅ Active
16C/34C	9,426 ft (2873 m / 2.873 km)	150 ft (46m)	`Permanent Paved (PEM)`	✅ Lighted	✅ Active
16R/34L	8,500 ft (2591 m / 2.591 km)	150 ft (46m)	`Permanent Paved (PEM)`	✅ Lighted	✅ Active
lower/high	— ft	— ft	`Unknown`	✅ Lighted	⛔ Closed

🛡️ Source: OurAirports Open Aviation Database, snapshot 2026-09-01 · Provenance →