UAL2173

Flight

Status

Completed

Arrival confirmed via

ADS-B (ground reading)

Departure

Boise Air Terminal/Gowen Field (BOI) — Boise, United States

Departed

2026-09-26 20:55 UTC

Arrival

Denver International Airport (DEN) — Denver, United States

Distance flown

1106 km

Straight-line distance

1042 km

Approach distance

42 km

Aircraft

Registration

N39418

Type

Boeing 737-900

Seats

179 total (117 Economy, 42 Economy Plus, 20 First)

Altitude & speed

Max altitude

33,025 ft

Max ground speed

494 kt

Tracked

2h 0m · 1,102 km

Altitude (ft, max 33,025)

Ground speed (kt, max 494)

Altitude (ft, max 33,025)

Ground speed (kt, max 494)

From the ADS-B positions we received; time since the first fix. A dashed stretch is a gap in reception, bridged by a straight line.

Route map

Airline

United Airlines (UAL)

Latest flights

Departed	Flight	Route	Reg	Aircraft	Status	Distance
2026-10-03 02:10 UTC	UAL2173	DEN → HDN Denver → Hayden	N27246	Boeing 737-800	In progress	~227 km est.
2026-10-02 21:43 UTC	UAL2173	BOI → DEN Boise → Denver	N33262	Boeing 737-800	Completed	1105 km
2026-10-02 01:57 UTC	UAL2173	DEN → HDN Denver → Hayden	N37252	Boeing 737-800	Incomplete (signal lost)	245 km
2026-10-01 21:03 UTC	UAL2173	BOI → DEN Boise → Denver	N37468	Boeing 737-900	Completed	1222 km
2026-10-01 01:22 UTC	UAL2173	DEN → HDN Denver → Hayden	N76514	Boeing 737-800	Incomplete (signal lost)	~270 km est. (162 km recorded)
2026-09-30 20:46 UTC	UAL2173	BOI → DEN Boise → Denver	N37255	Boeing 737-800	Completed	1191 km
2026-09-30 03:16 UTC	UAL2173	DEN → HDN Denver → Hayden	N76529	Boeing 737-800	Completed (landing presumed)	243 km
2026-09-29 20:52 UTC	UAL2173	BOI → DEN Boise → Denver	N37470	Boeing 737-900	Completed	1217 km
2026-09-29 01:39 UTC	UAL2173	DEN → HDN Denver → Hayden	N33266	Boeing 737-800	Incomplete (signal lost)	213 km
2026-09-28 21:00 UTC	UAL2173	BOI → DEN Boise → Denver	N69818	Boeing 737-900	Completed	1113 km
2026-09-28 17:35 UTC	UAL2173	DEN → BOI Denver → Boise	N69818	Boeing 737-900	Completed	1068 km
2026-09-28 03:13 UTC	UAL2173	DEN → HDN Denver → Hayden	N87512	Boeing 737-800	Incomplete (signal lost)	242 km
2026-09-27 23:34 UTC	UAL2173	BOI → DEN Boise → Denver	N36469	Boeing 737-900	Completed	1424 km
2026-09-27 01:54 UTC	UAL2173	DEN → HDN Denver → Hayden	N37267	Boeing 737-800	Incomplete (signal lost)	~280 km est. (179 km recorded)
2026-09-26 20:55 UTC	UAL2173	BOI → DEN Boise → Denver	N39418	Boeing 737-900	Completed	1106 km
2026-09-26 03:39 UTC	UAL2173	COS → DEN Colorado Springs → Denver	N37427	Boeing 737-900	Completed	210 km
2026-09-25 20:51 UTC	UAL2173	BOI → COS Boise → Colorado Springs	N37427	Boeing 737-900	Completed	2048 km
2026-09-25 01:39 UTC	UAL2173	DEN → HDN Denver → Hayden	N27246	Boeing 737-800	Incomplete (signal lost)	228 km
2026-09-24 20:49 UTC	UAL2173	BOI → DEN Boise → Denver	N39418	Boeing 737-900	Completed	1172 km
2026-09-24 01:30 UTC	UAL2173	DEN → HDN Denver → Hayden	N835UA	Airbus A319	Completed (landing presumed)	238 km
2026-09-23 20:32 UTC	UAL2173	BOI → DEN Boise → Denver	N64844	Boeing 737-900	Completed	1082 km
2026-09-23 01:52 UTC	UAL2173	DEN → HDN Denver → Hayden	N811UA	Airbus A319	Completed (landing presumed)	236 km
2026-09-22 20:55 UTC	UAL2173	BOI → DEN Boise → Denver	N68821	Boeing 737-900	Completed	1139 km
2026-09-22 01:30 UTC	UAL2173	DEN → HDN Denver → Hayden	N897UA	Airbus A319	Completed (landing presumed)	232 km
2026-09-21 20:33 UTC	UAL2173	BOI → DEN Boise → Denver	N57439	Boeing 737-900	Completed	1196 km
2026-09-21 02:20 UTC	UAL2173	DEN → HDN Denver → Hayden	N835UA	Airbus A319	Incomplete (signal lost)	454 km
2026-09-20 20:48 UTC	UAL2173	BOI → DEN Boise → Denver	N81449	Boeing 737-900	Completed	1171 km
2026-09-20 03:49 UTC	UAL2173	DEN → HDN Denver → Hayden	N853UA	Airbus A319	Completed (landing presumed)	235 km
2026-09-19 20:45 UTC	UAL2173	BOI → DEN Boise → Denver	N61898	Boeing 737-900	Completed	1236 km
2026-09-19 01:56 UTC	UAL2173	RAP → DEN Rapid City → Denver	N36469	Boeing 737-900	Completed	791 km
2026-09-18 21:06 UTC	UAL2173	BOI → RAP Boise → Rapid City	N36469	Boeing 737-900	Completed	2284 km
2026-09-18 02:48 UTC	UAL2173	DEN → HDN Denver → Hayden	N844UA	Airbus A319	Incomplete (signal lost)	~277 km est. (175 km recorded)
2026-09-17 21:15 UTC	UAL2173	BOI → DEN Boise → Denver	N68891	Boeing 737-900	Completed	1267 km
2026-09-17 01:36 UTC	UAL2173	DEN → HDN Denver → Hayden	N889UA	Airbus A319	Completed (landing presumed)	230 km
2026-09-16 20:48 UTC	UAL2173	BOI → DEN Boise → Denver	N37466	Boeing 737-900	Completed	1253 km
2026-09-16 01:42 UTC	UAL2173	DEN → HDN Denver → Hayden	N892UA	Airbus A319	Incomplete (signal lost)	234 km
2026-09-15 20:32 UTC	UAL2173	BOI → DEN Boise → Denver	N68822	Boeing 737-900	Completed	1181 km
2026-09-15 03:18 UTC	UAL2173	DEN → HDN Denver → Hayden	N820UA	Airbus A319	Incomplete (signal lost)	228 km
2026-09-14 20:53 UTC	UAL2173	BOI → DEN Boise → Denver	N62884	Boeing 737-900	Completed	1257 km
2026-09-14 01:32 UTC	UAL2173	DEN → HDN Denver → Hayden	N895UA	Airbus A319	Incomplete (signal lost)	359 km
2026-09-13 20:44 UTC	UAL2173	BOI → DEN Boise → Denver	N37427	Boeing 737-900	Completed	1249 km
2026-09-13 02:26 UTC	UAL2173	DEN → HDN Denver → Hayden	N4888U	Airbus A319	Incomplete (signal lost)	227 km
2026-09-12 20:51 UTC	UAL2173	BOI → DEN Boise → Denver	N62889	Boeing 737-900	Completed	1133 km
2026-09-12 01:24 UTC	UAL2173	DEN → HDN Denver → Hayden	N841UA	Airbus A319	Incomplete (signal lost)	236 km
2026-09-11 20:39 UTC	UAL2173	BOI → DEN Boise → Denver	N62883	Boeing 737-900	Completed	1281 km
2026-09-11 01:51 UTC	UAL2173	DEN → HDN Denver → Hayden	N835UA	Airbus A319	Incomplete (signal lost)	224 km
2026-09-10 20:37 UTC	UAL2173	BOI → DEN Boise → Denver	N28478	Boeing 737-900	Completed	1146 km
2026-09-10 01:52 UTC	UAL2173	DEN → HDN Denver → Hayden	N851UA	Airbus A319	Completed (landing presumed)	229 km
2026-09-09 20:49 UTC	UAL2173	BOI → DEN Boise → Denver	N61886	Boeing 737-900	Completed	1207 km
2026-09-08 01:33 UTC	UAL2173	DEN → HDN Denver → Hayden	N814UA	Airbus A319	Incomplete (signal lost)	236 km