Seattle to Miami: what the SEA to MIA corridor looks like
- Departure
- Seattle Tacoma International Airport, Seattle, the United States
- Arrival
- Miami International Airport, Miami, the United States
- Great-circle distance
- 4,380 km (2,365 nm)
- Typical airborne time
- 5h 36m
- Usual cruise levels
- FL340 to FL400
- Initial track
- eastbound
Route overview
Seattle Tacoma International Airport (SEA) in Seattle, the United States, to Miami International Airport (MIA) in Miami, the United States, is a great-circle distance of 4,380 km, about 2,365 nautical miles. At typical jet cruise speeds, and with an allowance for climb, descent and approach, that works out to roughly 5h 36m of airborne time. The great-circle track leaves Seattle eastbound and spends most of the flight in subtropical air.
Leaving Seattle
Seattle Tacoma sits between the Olympic and Cascade ranges on Puget Sound. Air funnelled between those ranges gives the climb out its character, particularly in winter storm season. The great-circle track leaves SEA eastbound, and the first waypoint band of the flight sits close to 42.0N 111.8W. On a sector of 5h 36m, the climb to cruise takes roughly the first twenty to twenty five minutes.
Mountain wave over the Rockies
The midpoint of the SEA to MIA track lies near 36.6N 101.3W, about 2,190 km from Seattle, which is where the corridor spends its longest continuous stretch at cruise level. The track crosses the Rocky Mountains, where westerly wind lifted over the ridge line oscillates downwind and produces mountain wave turbulence at cruise level. On windy days that gives a defined bumpy segment of roughly twenty to thirty minutes, with settled air before and after it.
Cruise altitudes on this sector
Long haul crews normally start cruise around FL340, then step climb toward FL380 or FL400 as the aircraft burns off fuel and can hold a higher level. Choice of level matters because turbulence is layered: a change of two or three thousand feet often puts the aircraft into calmer air, and that is one of the first adjustments a crew will request.
Arriving into Miami
Arrivals into Miami cross the sea breeze boundary that sets up over south Florida most summer afternoons. Crews use radar to pick a clean path through it, and the ride settles quickly once through. Descent normally begins around 31.2N 90.8W, roughly 1,095 km before MIA, and takes about half an hour from cruise level to touchdown.
Seasonal pattern
Mountain wave activity follows the strength of the winter westerlies, so the most defined wave segments occur between November and March, and mid summer crossings are typically calm.
Flying this route with less worry
Turbulence on this corridor is a comfort issue rather than a safety one. Airliners are certified to handle loads well beyond anything the atmosphere produces here, crews are trained for it, and the seat belt sign is the tool that keeps the cabin settled. What this page adds is knowing in advance: the map and Calmness Score above use current WAFS forecast data for SEA to MIA, so you can see what to expect before you board.