Open live map →

AS643 — flight status & live tracker

Denver (DEN) → Seattle (SEA)
Alaska Airlines · Live position from global ADS-B networks

Track AS643 in real time on the ScanFlyGo live map. If the aircraft is airborne and within coverage, you’ll see its exact position, altitude, speed and heading along the Denver–Seattle route.

✈️ Track AS643 on the live map

Route

AS643 is operated by Alaska Airlines and flies from Denver International Airport (DEN/KDEN) to Seattle Tacoma International Airport (SEA/KSEA). Compare fares on this route →

The aircraft most recently seen operating AS643 was a Boeing 737-900 (ICAO type code B739). Equipment changes by season and demand, so the type shown on the live map is the one that counts today.

What a seat on Denver → Seattle costs right now

Cheapest one-way fares found on this route in the last 48 hours, across 2 carrier(s). Prices move — open one to see live availability.

Frontier Airlines 2026-09-21 · 1 stop €116 Alaska Airlines 2026-09-12 · Direct €117

Fares are one-way, found by other travellers in the last 48 hours, and change constantly. ScanFlyGo earns a commission if you book — it costs you nothing extra.

Keep exploring

Frequently asked questions

How do I track flight AS643 live?

Open the ScanFlyGo live map for AS643 to see its current position, altitude and speed in real time. If the flight is airborne and within ADS-B coverage it appears on the map on the Denver–Seattle route.

What route does AS643 fly?

AS643 (Alaska Airlines) operates Denver (DEN/KDEN) to Seattle (SEA/KSEA).

What aircraft operates AS643?

AS643 was most recently observed being flown by a Boeing 737-900 (ICAO type B739). Airlines swap equipment by season and demand, so open the live map to see the exact aircraft — including its registration — operating today.

Is flight AS643 on time?

ScanFlyGo shows live aircraft position rather than airline schedule data. For exact departure and arrival times and delays, check the airline’s website — but the live map tells you instantly whether AS643 is already in the air and where it is.

Is tracking AS643 free?

Yes — ScanFlyGo flight tracking is free with no app or account, on desktop and mobile.

Positions come from community ADS-B networks for information and entertainment only — not for navigation. Coverage may be incomplete or delayed.