United Airlines San Francisco (SFO) to Seoul Incheon (ICN) Flight Statistics
Everything you need to fly Origin to Destination: timing, airlines, and insider tips.
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$708one-way, via Duffel
2x daily
Flown by United
The flight route from San Francisco International Airport to Seoul Incheon International Airport is a premier trans-Pacific corridor operated by United Airlines. This route serves as a vital link for technology professionals, tourists, and families, connecting the heart of Northern California to the vibrant capital of South Korea. With twice-daily service, it offers some of the most consistent connectivity between the United States and East Asia.
United Airlines operates this long-haul route using the advanced Boeing 787-10 Dreamliner. The service runs year-round with two departures every day, providing travelers with flexible timing options for both business and leisure. The flight covers approximately 5,600 miles and is a cornerstone of United's Asia-Pacific network.
“This route is essential for the global tech economy, facilitating travel between Silicon Valley and Seoul's industrial hubs. As a major hub-to-hub operation, it also provides critical connections for passengers traveling from across North America to destinations throughout Southeast Asia via Incheon's award-winning transit facilities.”
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Airline
United
Region
Asia-Pacific
Aircraft
B787-10
Service
2x daily
Airports
Landing and taking off
Departure
San Francisco International Airport (SFO)
Check-In
Arrive at least 3 hours before departure as international security lines can fluctuate.
Connections
Directly accessible via BART from downtown San Francisco and the East Bay.
Security
Clear and TSA PreCheck are available in the International Terminal G gates where United operates.
Arrival
Seoul Incheon International Airport (ICN)
On Arrival
Incheon is consistently ranked as one of the world's best airports; utilize the fast-track immigration if eligible.
Ground Transport
The AREX Express Train is the fastest way to reach Seoul Station in approximately 43 minutes.
Planning Ahead
United typically arrives at Terminal 1; ensure you check your gate for connecting flights to other Asian cities.
Booking, timing and fares
Timing & Reliability
Schedule. Flights generally depart SFO in the late morning and late evening.
Duration. Westbound flights to Seoul are longer due to headwinds, while eastbound flights to SFO are shorter.
Seasonality. The 2x daily frequency is maintained year-round regardless of season.
Time Zones. Seoul is 16-17 hours ahead of San Francisco depending on Daylight Saving Time.
Fares & Booking
Booking Window. Optimal prices are typically found 3 to 4 months before departure.
Cabin Advice. Premium Plus offers a significant comfort upgrade over Economy for a moderate price increase on this 13-hour flight.
Peak Pricing. Fares spike significantly during the Lunar New Year and the summer vacation months of July and August.
Peak
June through August and late December.
Shoulder
April to May and September to October.
Off-Peak
January to March, excluding Lunar New Year dates.
- Book at least 8-12 weeks in advance for the best trans-Pacific fares.
- Consider the evening departure to maximize sleep and minimize jet lag upon arrival.
- Use United MileagePlus miles for upgrades to Polaris Business Class during off-peak months.
- Check for Tuesday or Wednesday departures which often feature lower demand.
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Best Time to Fly Origin to Destination
Spring (April - May)
Mild weather and cherry blossom season make this the most popular time to visit.
Fall (September - November)
Clear skies and vibrant autumn foliage provide excellent conditions for sightseeing.
Winter (January - February)
Coldest months but offer the lowest airfares for budget-conscious travelers.
Trip Planning
Who this route suits
Best For
Business Professionals
Twice-daily schedule supports tight business itineraries between Silicon Valley and Seoul.
Tech Enthusiasts
Direct access to the world's most advanced consumer electronics and tech markets.
VFR Travelers
Reliable year-round service for those visiting friends and relatives in either country.
Connections & Alternatives
Singapore (SIN)
Seamless transit at Incheon for one of the most comfortable routes to Southeast Asia.
Bangkok (BKK)
Highly competitive fares often available with a short layover in Seoul.
Hong Kong (HKG)
Frequent onward connections available via United's partner airlines.
Travel Tips for the Origin-Destination Route
Good to Know
Visa & Entry
- Most US citizens require a K-ETA (Korea Electronic Travel Authorization) prior to boarding.
- Ensure your passport is valid for at least 6 months beyond your stay.
- Complete the Q-Code digital health declaration for faster processing upon arrival.
- Keep a digital or printed copy of your return flight itinerary for immigration.
Airport Transfers
- AREX Express Train: Fast, reliable, and connects directly to the Seoul subway system.
- Airport Limousine Bus: Ideal for reaching specific hotels or residential districts directly.
- K taxi: International taxis with English-speaking drivers are available at designated stands.
- Car Rentals: Available but generally not recommended for first-time visitors to Seoul due to traffic.
Baggage & Transit
- Standard international allowance usually includes 2 checked bags for this long-haul route.
- Keep a change of clothes in your carry-on for the 13-hour journey.
- If connecting in Seoul, your bags will usually be checked through to your final destination.
- Liquid restrictions apply to duty-free purchases made before security.
Checklist
- Approved K-ETA or valid Korean Visa
- Passport with 6 months validity
- Universal power adapter (Type C and F for Korea)
- Pre-downloaded KakaoMaps or Naver Maps (Google Maps is limited in Korea)
Airlines Flying Origin to Destination
United
14 flights per week
Exclusively utilizes the Boeing 787-10 for this route.
Common questions
How often does United fly from SFO to Seoul Incheon?
United operates two flights daily, seven days a week, year-round.
Which aircraft is used on the SFO to ICN route?
The route is primarily serviced by the Boeing 787-10 Dreamliner.
How long is the flight from San Francisco to Seoul?
The flight typically takes around 12 hours and 45 minutes to 13 hours and 15 minutes when flying west.
Do I need a visa for South Korea if I fly from San Francisco?
Most US citizens do not need a visa for short stays but must apply for a K-ETA before departure.
Which terminal does United use at Seoul Incheon?
United Airlines flights arrive and depart from Terminal 1 at Incheon International Airport.
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