UA2121

DEN → GRR · Boeing 737 MAX 9 · United Airlines

For travellers

Departure · Denver (DEN)

Gate B39

Scheduled 02 Oct 17:47 · Departed 02 Oct 17:43

Board status: Off block

Airborne since 02 Oct 17:56 (ADS-B)

Board data from den, updated 51 min ago; times local to each airport.

Flight

Status

Completed

Arrival confirmed via

ADS-B (ground reading)

Departure

Denver International Airport (DEN) — Denver, United States

Scheduled departure

2026-10-02 23:47 UTC

Departed

2026-10-02 23:56 UTC

Arrival

Gerald R. Ford International Airport (GRR) — Grand Rapids, United States

Distance flown

1679 km

Straight-line distance

1629 km

Approach distance

72 km

Aircraft

Registration

N77426

Type

Boeing 737 MAX 9

Seats

179 total (117 Economy, 42 Economy Plus, 20 First) (typical for type, not this tail)

CO2 (EMEP est., total)

35.6 t (252 kg/pax Business, 192 kg/pax Economy)

Altitude & speed

Max altitude

37,025 ft

Max ground speed

538 kt

Tracked

2h 28m · 1,675 km

Altitude (ft, max 37,025)

Ground speed (kt, max 538)

Altitude (ft, max 37,025)

Ground speed (kt, max 538)

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
2026-10-02 23:56 UTC	UAL2121	DEN → GRR Denver → Grand Rapids	N77426	Boeing 737 MAX 9	Completed	1679 km
2026-10-02 00:03 UTC	UAL2121	DEN → GRR Denver → Grand Rapids	N17594	Boeing 737-900	Completed	1717 km
2026-10-01 00:06 UTC	UAL2121	DEN → GRR Denver → Grand Rapids	B737-M9	Boeing 737 MAX 9	Completed	1726 km
2026-09-29 23:47 UTC	UAL2121	DEN → GRR Denver → Grand Rapids	N17429	Boeing 737 MAX 9	Completed	1659 km

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