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United · Route guide

United Airlines San Francisco (SFO) to Seoul Incheon (ICN) Flight Statistics

Everything you need to fly San Francisco to Seoul: when to go, who flies it, what it costs, and how to land well.

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1 airline on this route · 2x daily

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Airline

United

Aircraft

B787-10

Service

2x daily

Region

Asia-Pacific

The route

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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Airports

Taking off, touching down.

Check-in, security, connections and getting into town at both ends of the flight.

Departure

San Francisco International Airport (SFO)

SFO

Check-in: Arrive at least 3 hours before departure as international security lines can fluctuate.
Security: Clear and TSA PreCheck are available in the International Terminal G gates where United operates.
Connections: Directly accessible via BART from downtown San Francisco and the East Bay.

Arrival

Seoul Incheon International Airport (ICN)

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.

Timing & fares

When it flies, what it costs.

Schedule & 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.

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.

Peak season

June through August and late December.

Shoulder season

April to May and September to October.

Off-peak season

January to March, excluding Lunar New Year dates.

Tours and experiences at either end

Vetted day trips and activities in Seoul and San Francisco, through our travel partner.

Browse tours

When to fly

Best Time to Fly San Francisco to Seoul

01
Spring (April - May)
Mild weather and cherry blossom season make this the most popular time to visit.
02
Fall (September - November)
Clear skies and vibrant autumn foliage provide excellent conditions for sightseeing.
03
Winter (January - February)
Coldest months but offer the lowest airfares for budget-conscious travelers.

Trip planning

Who this route suits best.

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.

Field notes

Travel Tips for the San Francisco-Seoul Route

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)

Carriers

Airlines Flying San Francisco to Seoul

United

14 flights per week

Exclusively utilizes the Boeing 787-10 for this route.

FAQ

Common questions.

Straight answers about flying San Francisco to Seoul.

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.

Keep exploring

Where to next.

Structured data verified

Airports

San Francisco (SFO) (SAN)Incheon International Airport (ICN)San Francisco International Airport Seoul Incheon International Airport

Countries & layovers

United States South Korea San Francisco layover guide Seoul layover guide

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1Add your UA-SFO-ICN flight to your Borderly profile to track your trans-Pacific mileage.
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3Check historical on-time performance data to choose the most reliable departure time.

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