UAL3921

Flight

Status

Completed

Arrival confirmed via

ADS-B (ground reading)

Departure

George Bush Intercontinental Houston Airport (IAH) — Houston, United States

Departed

2026-09-23 14:19 UTC

Arrival

Washington Dulles International Airport (IAD) — Washington, DC, United States

Distance flown

2042 km

Straight-line distance

1913 km

Approach distance

85 km

Aircraft

Registration

N21108

Type

Boeing 757-200

Seats

169 total (108 Economy, 45 Economy Plus, 16 Polaris)

Altitude & speed

Max altitude

41,000 ft

Max ground speed

483 kt

Tracked

2h 42m · 2,029 km

Altitude (ft, max 41,000)

Ground speed (kt, max 483)

Altitude (ft, max 41,000)

Ground speed (kt, max 483)

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
2026-10-01 22:20 UTC	UAL3921	IAH → MSY Houston → New Orleans	N459UA	Airbus A320 233	Completed	496 km
2026-09-28 23:36 UTC	UAL3921	AUS → EWR Austin → Newark	N37324	Boeing 737 MAX 8	Completed	2594 km
2026-09-23 14:19 UTC	UAL3921	IAH → IAD Houston → Washington, DC	N21108	Boeing 757-200	Completed	2042 km
2026-09-21 22:06 UTC	UAL3921	CMH → SAV Columbus → Savannah	N804UA	Airbus A319	Completed (landing presumed)	933 km
2026-09-19 12:07 UTC	UAL3921	PBI → IAH West Palm Beach → Houston	N75425	Boeing 737-900	Completed	1650 km
2026-09-16 15:07 UTC	UAL3921	RIC → IAH Richmond → Houston	N26208	Boeing 737-800	Completed	2032 km
2026-09-07 17:29 UTC	UAL3921	IND → ORD Indianapolis → Chicago	N39415	Boeing 737-900	Completed	429 km
2026-09-02 13:13 UTC	UAL3921	SFO → SEA San Francisco → Seattle	N453UA	Airbus A320 233	Completed	1271 km
2026-09-01 17:34 UTC	UAL3921	IAD → EWR Washington, DC → Newark	N796UA	Boeing 777-200ER	Completed	452 km
2026-08-26 18:02 UTC	UAL3921	IAD → SFO Washington, DC → San Francisco	N26902	Boeing 787-8	Completed	4164 km
2026-08-25 14:29 UTC	UAL3921	LHR → EWR London → Newark	N76062	Boeing 767-400ER	Completed	6009 km
2026-08-23 04:41 UTC	UAL3921	SAN → SFO San Diego → San Francisco	N67815	Boeing 737-900	Completed	1198 km
2026-08-21 14:27 UTC	UAL3921	LAX → SAN Los Angeles → San Diego	N37474	Boeing 737-900	Completed	346 km
2026-08-17 01:50 UTC	UAL3921	SFO → ORD San Francisco → Chicago	N29907	Boeing 787-8	Completed	4442 km
2026-08-14 16:32 UTC	UAL3921	LAX → ONT Los Angeles → Ontario	N39423	Boeing 737-900	Completed	~372 km est. (256 km recorded)
2026-08-14 00:05 UTC	UAL3921	KOA → SFO Kailua-Kona → San Francisco	N75858	Boeing 737-300	Completed	~5941 km est. (4259 km recorded)