Live tracking not available yet
AC3421 has a schedule in our database but isn't on the airport board right now. Live position data typically appears within a few hours of departure.
Flight Status
Scheduled
Route Info
SFO
San Francisco International Airport
San Francisco
T3 Gate E4 Scheduled 3:15 PM
Actual 3:15 PM
ORD
Chicago O'Hare International Airport
Chicago
T1 Gate B4 Scheduled 9:36 PM
Actual 9:36 PM
Baggage claim 11
4h 21m flight time
Mon Wed Fri Sat Sun
Operated by United Airlines
Recent Flights
No flight history yet
History builds as this flight gets tracked
Schedule
Operates
Mon Wed Fri Sat Sun
Departure
3:15 PM
Arrival
9:36 PM
Duration
4h 21m
Aircraft
Boeing 737-900
Terminal
T3
T1
Gate
E4
B4
Actual
15:15
21:36
Baggage
Carousel 11
Operating Days
Mo
Tu
We
Th
Fr
Sa
Su
Upcoming
Fri, Mar 20
Sat, Mar 21
Sun, Mar 22
Mon, Mar 23
Wed, Mar 25
Schedule valid
Mar 06 —
Mar 27, 2026