FFT9421

DEN → SEA · Airbus A321 · Frontier Airlines

For travellers

Departure · Denver (DEN)

Scheduled 29 Sep 23:30 · Departed 29 Sep 23:17 · early

Board status: Off block

Airborne since 29 Sep 23:31 (ADS-B)

Board data from den, updated 2981 min ago; times local to each airport.

Flight

Status

Completed

Arrival confirmed via

ADS-B (callsign change)

Departure

Denver International Airport (DEN) — Denver, United States

Scheduled departure

2026-09-30 05:30 UTC

Departed

2026-09-30 05:31 UTC

Arrival

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

Also flies as

F99421

Distance flown

1716 km

Straight-line distance

1645 km

Approach distance

71 km

Aircraft

Registration

N721FR

Type

Airbus A321

Seats

230 total (200 Economy, 30 Stretch)

CO2 (EMEP est., total)

52.0 t (226 kg/pax Economy)

Altitude & speed

Max altitude

36,050 ft

Max ground speed

476 kt

Tracked

3h 13m · 1,711 km

Altitude (ft, max 36,050)

Ground speed (kt, max 476)

Altitude (ft, max 36,050)

Ground speed (kt, max 476)

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

Frontier Airlines (FFT)

Latest flights

Departed	Flight	Route	Reg	Aircraft	Status	Distance
2026-09-30 05:31 UTC	FFT9421	DEN → SEA Denver → Seattle	N721FR	Airbus A321	Completed	1716 km
2026-09-29 19:28 UTC	FFT9421	SAN → DEN San Diego → Denver	N621FR	Airbus A321 Neo	Completed	1461 km
2026-09-10 02:51 UTC	FFT9421	MCO → PHL Orlando → Philadelphia	N648FR	Airbus A321 Neo	Completed	1595 km
2026-08-27 13:30 UTC	FFT9421	LAS → SAN Las Vegas → San Diego	N721FR	Airbus A321	Completed	568 km

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