| ARRIVED 6 HOUR 46 MINUTES AGO |
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| Date | Flight | Departure Airport | Arrival Airport | Scheduled | Plane | Estimated | ||
|---|---|---|---|---|---|---|---|---|
| Departure | Arrival | Departure | Arrival | |||||
| Sat, 02 May | UA2121 | Denver Intl (DEN) | Gerald R Ford Intl (GRR) | 18:05 MDT | 22:47 EDT | |||
| Sat, 02 May | UA2121 | San Francisco Intl (SFO) | Denver Intl (DEN) | 12:45 PDT | 16:29 MDT | |||
| Sat, 02 May | UA2121 | Seattle Tacoma Intl (SEA) | San Francisco Intl (SFO) | 08:38 PDT | 10:57 PDT | |||
| Fri, 01 May | UA2121 | Denver Intl (DEN) | Gerald R Ford Intl (GRR) | 18:00 MDT | 22:42 EDT | N39415 (Boeing B739) | 17:58 MDT | 22:21 EDT |
| Fri, 01 May | UA2121 | San Francisco Intl (SFO) | Denver Intl (DEN) | 12:45 PDT | 16:29 MDT | |||
| Fri, 01 May | UA2121 | Seattle Tacoma Intl (SEA) | San Francisco Intl (SFO) | 08:38 PDT | 10:57 PDT | N466UA (Airbus A320) | 10:21 PDT | 12:08 PDT |
| Thu, 30 Apr | UA2121 | Denver Intl (DEN) | Gerald R Ford Intl (GRR) | 18:00 MDT | 22:42 EDT | 18:03 MDT | 20:09 EDT | |
| Thu, 30 Apr | UA2121 | San Francisco Intl (SFO) | Denver Intl (DEN) | 12:45 PDT | 16:29 MDT | N430UA (Airbus A320) | 13:32 PDT | 14:32 MDT |
| Thu, 30 Apr | UA2121 | Seattle Tacoma Intl (SEA) | San Francisco Intl (SFO) | 08:44 PDT | 11:03 PDT | N430UA (Airbus A320) | 10:53 PDT | 12:28 PDT |
| Wed, 29 Apr | UA2121 | Denver Intl (DEN) | Gerald R Ford Intl (GRR) | 17:35 MDT | 22:12 EDT | 17:41 MDT | 22:44 EDT | |
| Wed, 29 Apr | UA2121 | San Francisco Intl (SFO) | Denver Intl (DEN) | 12:45 PDT | 16:29 MDT | 12:48 PDT | 16:14 MDT | |
| Wed, 29 Apr | UA2121 | Seattle Tacoma Intl (SEA) | San Francisco Intl (SFO) | 08:42 PDT | 11:01 PDT | N483UA (Airbus A320) | 09:51 PDT | 11:22 PDT |
| Tue, 28 Apr | UA2121 | Denver Intl (DEN) | Gerald R Ford Intl (GRR) | 17:35 MDT | 22:12 EDT | N26232 (Boeing B738) | 17:35 MDT | 23:48 EDT |
| Tue, 28 Apr | UA2121 | San Francisco Intl (SFO) | Denver Intl (DEN) | 12:45 PDT | 16:29 MDT | |||
| Tue, 28 Apr | UA2121 | Seattle Tacoma Intl (SEA) | San Francisco Intl (SFO) | 08:42 PDT | 11:01 PDT | N431UA (Airbus A320) | 08:58 PDT | 11:22 PDT |
| Mon, 27 Apr | UA2121 | Denver Intl (DEN) | Gerald R Ford Intl (GRR) | 17:35 MDT | 22:12 EDT | N66893 (Boeing B739) | 17:28 MDT | 22:24 EDT |
| Mon, 27 Apr | UA2121 | San Francisco Intl (SFO) | Denver Intl (DEN) | 12:45 PDT | 16:29 MDT | N1902U ( A320) | 13:18 PDT | 18:47 MDT |
| Mon, 27 Apr | UA2121 | Seattle Tacoma Intl (SEA) | San Francisco Intl (SFO) | 08:42 PDT | 11:01 PDT | N1902U ( A320) | 09:36 PDT | 11:32 PDT |
| Sun, 26 Apr | UA2121 | Denver Intl (DEN) | Gerald R Ford Intl (GRR) | 17:35 MDT | 22:12 EDT | 17:59 MDT | 23:51 EDT | |
| Sun, 26 Apr | UA2121 | San Francisco Intl (SFO) | Denver Intl (DEN) | 12:45 PDT | 16:29 MDT | N38454 (Boeing B739) | 12:48 PDT | 16:18 MDT |
| Sun, 26 Apr | UA2121 | Seattle Tacoma Intl (SEA) | San Francisco Intl (SFO) | 08:42 PDT | 11:01 PDT | N451UA (Airbus A320) | 08:54 PDT | 10:54 PDT |
| Sat, 25 Apr | UA2121 | Denver Intl (DEN) | Gerald R Ford Intl (GRR) | 17:35 MDT | 22:12 EDT | N68801 (Boeing B739) | 18:05 MDT | 22:21 EDT |
| Sat, 25 Apr | UA2121 | San Francisco Intl (SFO) | Denver Intl (DEN) | 12:45 PDT | 16:29 MDT | N68453 (Boeing B739) | 12:49 PDT | 16:07 MDT |
| Sat, 25 Apr | UA2121 | Seattle Tacoma Intl (SEA) | San Francisco Intl (SFO) | 08:42 PDT | 11:01 PDT | N477UA (Airbus A320) | 09:44 PDT | 11:29 PDT |
| Fri, 24 Apr | UA2121 | Denver Intl (DEN) | Gerald R Ford Intl (GRR) | 17:35 MDT | 22:12 EDT | N37277 (Boeing B738) | 18:08 MDT | 22:22 EDT |
| Fri, 24 Apr | UA2121 | San Francisco Intl (SFO) | Denver Intl (DEN) | 12:45 PDT | 16:29 MDT | N38454 (Boeing B739) | 13:06 PDT | 16:12 MDT |
| Fri, 24 Apr | UA2121 | Seattle Tacoma Intl (SEA) | San Francisco Intl (SFO) | 08:42 PDT | 11:01 PDT | N482UA (Airbus A320) | 09:51 PDT | 11:31 PDT |
| Thu, 23 Apr | UA2121 | Denver Intl (DEN) | Gerald R Ford Intl (GRR) | 17:35 MDT | 22:12 EDT | 17:34 MDT | 22:45 EDT | |
| Thu, 23 Apr | UA2121 | San Francisco Intl (SFO) | Denver Intl (DEN) | 12:45 PDT | 16:29 MDT | 13:45 PDT | 17:05 MDT | |
| Thu, 23 Apr | UA2121 | Seattle Tacoma Intl (SEA) | San Francisco Intl (SFO) | 08:42 PDT | 11:01 PDT | 09:25 PDT | 11:15 PDT | |
| Wed, 22 Apr | UA2121 | Denver Intl (DEN) | Gerald R Ford Intl (GRR) | 17:35 MDT | 22:12 EDT | N61886 (Boeing B739) | 17:33 MDT | 21:54 EDT |
| Wed, 22 Apr | UA2121 | San Francisco Intl (SFO) | Denver Intl (DEN) | 12:45 PDT | 16:29 MDT | N27421 (Boeing B739) | 13:03 PDT | 19:17 MDT |
| Wed, 22 Apr | UA2121 | Seattle Tacoma Intl (SEA) | San Francisco Intl (SFO) | 08:42 PDT | 11:01 PDT | N452UA (Airbus A320) | 09:08 PDT | 11:03 PDT |
| Tue, 21 Apr | UA2121 | Denver Intl (DEN) | Gerald R Ford Intl (GRR) | 17:35 MDT | 22:12 EDT | N36472 (Boeing B739) | 17:32 MDT | 21:50 EDT |
| Tue, 21 Apr | UA2121 | San Francisco Intl (SFO) | Denver Intl (DEN) | 12:45 PDT | 16:29 MDT | N69806 (Boeing B739) | 13:46 PDT | 16:46 MDT |
| Mon, 20 Apr | UA2121 | Denver Intl (DEN) | Gerald R Ford Intl (GRR) | 17:35 MDT | 22:12 EDT | 18:09 MDT | 00:09 EDT | |
| Mon, 20 Apr | UA2121 | San Francisco Intl (SFO) | Denver Intl (DEN) | 12:45 PDT | 16:29 MDT | N464UA (Airbus A320) | 13:01 PDT | 16:02 MDT |
| Mon, 20 Apr | UA2121 | Seattle Tacoma Intl (SEA) | San Francisco Intl (SFO) | 08:42 PDT | 11:01 PDT | |||
| Sun, 19 Apr | UA2121 | Denver Intl (DEN) | Gerald R Ford Intl (GRR) | 17:35 MDT | 22:12 EDT | N36472 (Boeing B739) | 18:10 MDT | 23:26 EDT |
| Sun, 19 Apr | UA2121 | San Francisco Intl (SFO) | Denver Intl (DEN) | 12:45 PDT | 16:29 MDT | N66814 (Boeing B739) | 12:48 PDT | 16:15 MDT |
| Sat, 18 Apr | UA2121 | Denver Intl (DEN) | Gerald R Ford Intl (GRR) | 17:35 MDT | 22:12 EDT | |||
| Sat, 18 Apr | UA2121 | San Francisco Intl (SFO) | Denver Intl (DEN) | 12:45 PDT | 16:29 MDT | N38417 (Boeing B739) | 12:43 PDT | 19:40 MDT |
| Sat, 18 Apr | UA2121 | Seattle Tacoma Intl (SEA) | San Francisco Intl (SFO) | 08:42 PDT | 11:01 PDT | N489UA (Airbus A320) | 09:05 PDT | 10:46 PDT |
| Fri, 17 Apr | UA2121 | Denver Intl (DEN) | Gerald R Ford Intl (GRR) | 17:35 MDT | 22:12 EDT | N37470 (Boeing B739) | 17:44 MDT | 22:00 EDT |
| Fri, 17 Apr | UA2121 | San Francisco Intl (SFO) | Denver Intl (DEN) | 12:45 PDT | 16:29 MDT | 13:02 PDT | 16:35 MDT | |
| Fri, 17 Apr | UA2121 | Seattle Tacoma Intl (SEA) | San Francisco Intl (SFO) | 08:42 PDT | 11:01 PDT | N479UA (Airbus A320) | 09:31 PDT | 11:25 PDT |
| Thu, 16 Apr | UA2121 | Denver Intl (DEN) | Gerald R Ford Intl (GRR) | 17:35 MDT | 22:12 EDT | N64809 (Boeing B739) | 17:38 MDT | 21:57 EDT |
| Thu, 16 Apr | UA2121 | San Francisco Intl (SFO) | Denver Intl (DEN) | 12:45 PDT | 16:29 MDT | N37420 (Boeing B739) | 13:55 PDT | 16:52 MDT |
| Thu, 16 Apr | UA2121 | Seattle Tacoma Intl (SEA) | San Francisco Intl (SFO) | 08:42 PDT | 11:01 PDT | N437UA (Airbus A320) | 09:34 PDT | 11:20 PDT |
| Wed, 15 Apr | UA2121 | Denver Intl (DEN) | Gerald R Ford Intl (GRR) | 17:35 MDT | 22:12 EDT | N12218 (Boeing B738) | 17:42 MDT | 22:18 EDT |
| Wed, 15 Apr | UA2121 | San Francisco Intl (SFO) | Denver Intl (DEN) | 12:45 PDT | 16:29 MDT | |||
| Wed, 15 Apr | UA2121 | Seattle Tacoma Intl (SEA) | San Francisco Intl (SFO) | 08:42 PDT | 11:01 PDT | N1902U ( A320) | 09:10 PDT | 11:48 PDT |
| Tue, 14 Apr | UA2121 | Denver Intl (DEN) | Gerald R Ford Intl (GRR) | 17:35 MDT | 22:12 EDT | |||
| Tue, 14 Apr | UA2121 | San Francisco Intl (SFO) | Denver Intl (DEN) | 12:45 PDT | 16:29 MDT | N37464 (Boeing B739) | 13:03 PDT | 16:56 MDT |
| Tue, 14 Apr | UA2121 | Seattle Tacoma Intl (SEA) | San Francisco Intl (SFO) | 08:42 PDT | 11:01 PDT | N435UA (Airbus A320) | 08:53 PDT | 11:45 PDT |
| Mon, 13 Apr | UA2121 | Denver Intl (DEN) | Gerald R Ford Intl (GRR) | 17:35 MDT | 22:12 EDT | 17:31 MDT | 20:10 EDT | |
| Mon, 13 Apr | UA2121 | San Francisco Intl (SFO) | Denver Intl (DEN) | 12:45 PDT | 16:29 MDT | 13:42 PDT | 17:00 MDT | |
| Mon, 13 Apr | UA2121 | Seattle Tacoma Intl (SEA) | San Francisco Intl (SFO) | 08:42 PDT | 11:01 PDT | 10:01 PDT | 11:56 PDT | |
| Sun, 12 Apr | UA2121 | Denver Intl (DEN) | Gerald R Ford Intl (GRR) | 17:35 MDT | 22:12 EDT | N62849 (Boeing B739) | 17:44 MDT | 22:27 EDT |
| Sun, 12 Apr | UA2121 | San Francisco Intl (SFO) | Denver Intl (DEN) | 12:45 PDT | 16:29 MDT | N62849 (Boeing B739) | 12:43 PDT | 16:26 MDT |
| Sun, 12 Apr | UA2121 | Seattle Tacoma Intl (SEA) | San Francisco Intl (SFO) | 08:42 PDT | 11:01 PDT | N455UA (Airbus A320) | 08:48 PDT | 11:38 PDT |
| Sat, 11 Apr | UA2121 | Denver Intl (DEN) | Gerald R Ford Intl (GRR) | 17:35 MDT | 22:12 EDT | N66831 (Boeing B739) | 17:36 MDT | 22:12 EDT |
| Sat, 11 Apr | UA2121 | San Francisco Intl (SFO) | Denver Intl (DEN) | 12:45 PDT | 16:29 MDT | 12:39 PDT | 16:41 MDT | |
| Sat, 11 Apr | UA2121 | Seattle Tacoma Intl (SEA) | San Francisco Intl (SFO) | 08:42 PDT | 11:01 PDT | N15712 (Boeing B737) | 09:02 PDT | 10:15 PDT |
| Fri, 10 Apr | UA2121 | San Francisco Intl (SFO) | Denver Intl (DEN) | 12:45 PDT | 16:29 MDT | N38473 (Boeing B739) | 12:55 PDT | 16:44 MDT |
| Fri, 10 Apr | UA2121 | Seattle Tacoma Intl (SEA) | San Francisco Intl (SFO) | 08:42 PDT | 11:01 PDT | N449UA (Airbus A320) | 09:37 PDT | 11:30 PDT |
| Thu, 09 Apr | UA2121 | Denver Intl (DEN) | Gerald R Ford Intl (GRR) | 17:35 MDT | 22:12 EDT | N67827 (Boeing B739) | 17:29 MDT | 21:55 EDT |
| Thu, 09 Apr | UA2121 | San Francisco Intl (SFO) | Denver Intl (DEN) | 12:45 PDT | 16:29 MDT | |||
| Wed, 08 Apr | UA2121 | Denver Intl (DEN) | Gerald R Ford Intl (GRR) | 17:35 MDT | 22:12 EDT | N37474 (Boeing B739) | 17:35 MDT | 21:57 EDT |
| Wed, 08 Apr | UA2121 | San Francisco Intl (SFO) | Denver Intl (DEN) | 12:45 PDT | 16:29 MDT | N69810 (Boeing B739) | 13:40 PDT | 16:38 MDT |
| Wed, 08 Apr | UA2121 | Seattle Tacoma Intl (SEA) | San Francisco Intl (SFO) | 08:42 PDT | 11:01 PDT | N466UA (Airbus A320) | 09:32 PDT | 11:15 PDT |
| Tue, 07 Apr | UA2121 | Denver Intl (DEN) | Gerald R Ford Intl (GRR) | 17:35 MDT | 22:12 EDT | |||
| Tue, 07 Apr | UA2121 | San Francisco Intl (SFO) | Denver Intl (DEN) | 12:45 PDT | 16:29 MDT | N68880 (Boeing B739) | 13:24 PDT | 16:46 MDT |
| Tue, 07 Apr | UA2121 | Seattle Tacoma Intl (SEA) | San Francisco Intl (SFO) | 08:42 PDT | 11:01 PDT | N496UA (Airbus A320) | 08:50 PDT | 10:47 PDT |
| Mon, 06 Apr | UA2121 | Denver Intl (DEN) | Gerald R Ford Intl (GRR) | 17:35 MDT | 22:12 EDT | N38446 (Boeing B739) | 17:28 MDT | 21:53 EDT |
| Mon, 06 Apr | UA2121 | San Francisco Intl (SFO) | Denver Intl (DEN) | 12:45 PDT | 16:29 MDT | 13:41 PDT | 16:13 MDT | |
| Mon, 06 Apr | UA2121 | Seattle Tacoma Intl (SEA) | San Francisco Intl (SFO) | 08:42 PDT | 11:01 PDT | 09:43 PDT | 11:49 PDT | |
| Sun, 05 Apr | UA2121 | Denver Intl (DEN) | Gerald R Ford Intl (GRR) | 17:35 MDT | 22:12 EDT | 17:27 MDT | 23:54 EDT | |
| Sun, 05 Apr | UA2121 | Seattle Tacoma Intl (SEA) | San Francisco Intl (SFO) | 08:42 PDT | 11:01 PDT | N460UA (Airbus A320) | 09:34 PDT | 11:16 PDT |
| Sat, 04 Apr | UA2121 | Denver Intl (DEN) | Gerald R Ford Intl (GRR) | 17:35 MDT | 22:12 EDT | N61882 (Boeing B739) | 17:33 MDT | 22:00 EDT |
| Sat, 04 Apr | UA2121 | San Francisco Intl (SFO) | Denver Intl (DEN) | 12:45 PDT | 16:29 MDT | N494UA (Airbus A320) | 12:53 PDT | 14:49 MDT |
| Fri, 03 Apr | UA2121 | Denver Intl (DEN) | Gerald R Ford Intl (GRR) | 17:35 MDT | 22:12 EDT | N69839 (Boeing B739) | 18:46 MDT | 22:32 EDT |
| Fri, 03 Apr | UA2121 | San Francisco Intl (SFO) | Denver Intl (DEN) | 12:45 PDT | 16:29 MDT | N75429 (Boeing B739) | 12:58 PDT | 16:17 MDT |
| Fri, 03 Apr | UA2121 | Seattle Tacoma Intl (SEA) | San Francisco Intl (SFO) | 08:42 PDT | 11:01 PDT | N477UA (Airbus A320) | 09:28 PDT | 11:38 PDT |
| Thu, 02 Apr | UA2121 | San Francisco Intl (SFO) | Denver Intl (DEN) | 12:45 PDT | 16:29 MDT | 12:38 PDT | 16:21 MDT | |
| Wed, 01 Apr | UA2121 | Denver Intl (DEN) | Gerald R Ford Intl (GRR) | 17:35 MDT | 22:12 EDT | N69824 (Boeing B739) | 17:56 MDT | 22:13 EDT |
| Wed, 01 Apr | UA2121 | San Francisco Intl (SFO) | Denver Intl (DEN) | 12:45 PDT | 16:29 MDT | |||
| Wed, 01 Apr | UA2121 | Seattle Tacoma Intl (SEA) | San Francisco Intl (SFO) | 08:42 PDT | 11:01 PDT | N494UA (Airbus A320) | 10:02 PDT | 12:18 PDT |