Distance from Seoul to San Francisco: Great-Circle Route

The great-circle (shortest air) distance between Seoul, South Korea (ICN) and San Francisco, California (SFO) is approximately 5,430 miles (8,735 km).

Flight Realities

• Nonstop flight time: 10–11 hours (westbound longer due to headwinds)
• Current nonstop carriers: Korean Air, Asiana, United, Delta, Singapore Airlines (seasonal)
• Typical routing: North Pacific great circle—passes near Aleutian Islands, Gulf of Alaska, enters CA coast near Cape Mendocino
• Time zones: Seoul (KST, UTC+9) → SF (PDT, UTC−7) = 16-hour difference (15 in DST)

Why Great-Circle Distance Matters

Flat maps distort. The actual flight path curves northward over the Pacific—appearing "bent" on Mercator maps but representing the shortest 3D route on a sphere. This saves ~1,000 miles vs. a rhumb line (constant compass heading).

Practical Context

• Cargo: Major trade lane (electronics, auto parts, agricultural products)
• Travel: 1M+ passengers annually pre-pandemic
• Alternate hubs: Tokyo (NRT/HND), Taipei (TPE), Hong Kong (HKG) for connections

Whether for business, study, or adventure, the Seoul–San Francisco link bridges two innovation hubs across the planet's largest ocean.