UAL4209

Flight

Status

Completed

Arrival confirmed via

ADS-B (ground reading)

Departure

Boeing Field King County International Airport (BFI) — Seattle, United States

Departed

2026-09-30 18:22 UTC

Arrival

Seattle Tacoma International Airport (SEA) — Seattle, United States

Distance flown

666 km

Straight-line distance

9 km

Approach distance

84 km

Registration

Type

Boeing 737 MAX 9

Max altitude

34,025 ft

Max ground speed

512 kt

Tracked

1h 19m · 661 km

Altitude (ft, max 34,025)

Ground speed (kt, max 512)

Altitude (ft, max 34,025)

Ground speed (kt, max 512)

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.

Boeing (BOE)

United Airlines (UAL)

Latest flights

Departed	Flight	Route	Reg	Aircraft	Status	Distance
2026-10-03 20:42 UTC	UAL4209	MCI → ORD Kansas City → Chicago	N39726	Boeing 737-700	Completed (landing confirmed by airport data)	689 km
2026-09-30 18:22 UTC	UAL4209	BFI → SEA Seattle → Seattle	N17482	Boeing 737 MAX 9	Completed	666 km
2026-09-26 20:59 UTC	UAL4209	MEM → MCO Memphis → Orlando	N497UA	Airbus A320 233	Completed	1176 km
2026-09-20 21:19 UTC	UAL4209	BFI → SEA Seattle → Seattle	N57480	Boeing 737 MAX 9	Completed	605 km
2026-09-01 20:07 UTC	UAL4209	PAE → IAD Everett → Washington, DC	N61111	Boeing 787-9	Completed	3922 km
2026-08-15 01:09 UTC	UAL4209	DEN → VCV Denver → Victorville	N803UA	Airbus A319	Completed	1844 km
2026-08-13 20:00 UTC	UAL4209	BFI → SEA Seattle → Seattle	N47450	Boeing 737 MAX 9	Completed	1500 km