Live tracking not available yet
UA558 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
DEN
Denver International Airport
Denver
Gate A28 Scheduled 7:50 AM
Actual 7:50 AM
BOS
Boston Logan International Airport
Boston
TB Gate B24 Scheduled 1:42 PM
Actual 1:42 PM
Baggage claim 6
3h 52m flight time
Daily
Recent Flights
Last 1 observedMar 13
Fri
DEN
BOS
Dep 07:51:00
(actual 08:06:00)
A21N
Boarding
Schedule
Operates
Daily
Departure
7:50 AM
Arrival
1:42 PM
Duration
3h 52m
Aircraft
Boeing 737-900
Gate
A28
B24
Actual
07:50
13:42
Baggage
Carousel 6
Operating Days
Mo
Tu
We
Th
Fr
Sa
Su
Upcoming
Fri, Mar 20
Sat, Mar 21
Sun, Mar 22
Mon, Mar 23
Tue, Mar 24
Wed, Mar 25
Thu, Mar 26
Schedule valid
Mar 17 —
Jun 16, 2026