Suvarnabhumi Airport → San Francisco International Airport · UA821 + UA878 · 2026-12-18
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.
Check the departure airport, destination, flight number and travel date together, then use the official links below to confirm your journey.
Route
United Airlines
UA821 + UA878
United Airlines operates UA878 between Hong Kong and San Francisco. Check your ticket for any schedule or operating-carrier changes before traveling.
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
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Flight delays & cancellations
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.
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