routeloads.
Route profile BOS-SEA

BOS ↔ SEA loads

How full flights are between Boston and Seattle, both directions combined, using the latest 12 months of DOT T-100 data ending Apr 2026.

LATEST 12-MONTH WINDOW

BOS to SEA averages 87% full

Boston and Seattle: 87% average load factor, 771k passengers, and 882k seats across both directions in the latest 12-month BTS window.

Load factor
87%
Passengers
771k
Seats
882k

Monthly trend

MonthLoadPassengers
May 202589%75k
Jun 202590%85k
Jul 202593%93k
Aug 202594%95k
Sep 202589%76k
Oct 202586%72k
Nov 202582%48k
Dec 202583%48k
Jan 202682%37k
Feb 202679%35k
Mar 202684%53k
Apr 202685%54k