San Francisco International Airport ↔ Suvarnabhumi Airport

Text and commentary: ThaiLiveNow

Check the departure airport, destination, flight number and travel date together, then use the official links below to confirm your journey.

To Thailand

UA877 + UA820 · SFO → BKK

Change flights in Hong Kong (HKG): United UA877 from San Francisco to Hong Kong, then United UA820 to Bangkok. This is a connecting itinerary, not a nonstop flight or a single-flight-number through service.

United publishes daily service on this routing. Its route overview does not state a timetable validity period; check the departure and arrival times for your travel date in the booking system. The separately reviewed booking is for departure on December 18, 2026.

Checked on: 2026-10-19

Verified departure dates: 2026-12-18

From Thailand

UA821 + UA878 · BKK → SFO

Change flights in Hong Kong (HKG): UA821 from Bangkok to Hong Kong, then UA878 to San Francisco. The flight number changes at Hong Kong; this is a connecting itinerary, not a nonstop flight or a single-flight-number through service.

Checked on: 2026-10-19

Verified departure dates: 2026-12-18

Airport counters

San Francisco International Airport · United Airlines · International check-in location

International Terminal G · Level 3 · Aisles 1–2

For a United international departure from San Francisco, check in on the International Terminal’s Departures Level (Level 3). Business and Premium passengers use Aisle 1; Economy passengers use Aisle 2. Aisles are check-in rows, not boarding gate numbers. This is separate from United’s domestic Terminal 2 and Terminal 3 listings. Ask United for the counter opening time and your flight’s check-in deadline; security checkpoint hours are not check-in hours.

Checked on: 2026-10-19

San Francisco International Airport · United Airlines · Baggage service contact

+1 800-221-6903

SFO lists this number as United’s Baggage Service. It is a baggage support channel, not a verified direct phone for a check-in counter or a particular arrivals desk. If your checked bag is missing or damaged, contact the operating airline’s arrivals baggage team and keep the report number.

Checked on: 2026-10-19

San Francisco International Airport · United Airlines · General airline contact · remote support

+1 800-538-2929

The SFO United international entry labels this number General Telephone. It is an airline contact, not a dedicated check-in desk or departure gate phone. Use the baggage service number for baggage support.

Checked on: 2026-10-19

Check today’s flight status

United Airlines · Check today’s flight status ↗

Airport information

San Francisco International Airport →Suvarnabhumi Airport →

Airline information

United Airlines →

Flight delays & cancellations

Delay and cancellation rights for flights departing Thailand: CAAT complaints →Arriving late at Suvarnabhumi after a flight delay →Find the right airline counter at the airport →Filing a Travel Insurance Claim: What to Prepare →My flight is delayed · US–Thailand →My flight has been canceled · US–Thailand →My checked bag has not arrived · US–Thailand →My suitcase is damaged · US–Thailand →

Before you travel

How do I check this flight for my travel date?

Use the airline’s or airport’s official flight lookup with your flight number and the departure airport’s local date. Compare the airports and operating airline with your ticket; a schedule verified for one date does not confirm every departure.

Where should I go for check-in or baggage help?

Open the airport and airline details for the relevant stop, then check your flight on the departure screens. Check-in, ticketing offices and arrival baggage desks serve different purposes; use the contact that matches your issue.

What evidence should I keep after a delay or cancellation?

Keep your ticket, boarding pass, airline notices and relevant receipts. Follow the operating airline’s certificate procedure and your insurer’s document requirements; a certificate request does not by itself establish entitlement to payment.

View official sources · 9