Space-A Scout › Routes › Osan AB to Seattle-Tacoma Intl
In the year ending October 2026, 62 Space-A flights went from Osan AB to Seattle-Tacoma Intl. That is about once a week, and roughly 39 percent of Osan AB's recorded departures. On the 50 of those where the terminal reported who made the cut, Category VI travelers, the retirees and veterans at the back of the line, got a seat 64 percent of the time.
By raw volume, September and August saw the most departures on this route in the year ending October 2026, and December the fewest. The route was active in 14 of the 14 months on record.
Tuesday is the day to watch: 23 of the 62 roll calls for this route, 37 percent, fell on a Tuesday.
Category VI is the last group called at roll call. On this route, 64 percent of the 50 reported flights still had room by the time Cat VI was called. The rate looks rough on its own. Read it with the seat numbers below before you write the route off.
The lowest category that made each reported flight, in the year ending October 2026:
| Category II | 5 flights |
| Category III | 5 flights |
| Category IV | 7 flights |
| Category V | 1 flight |
| Category VI | 32 flights |
Seats are the other half of the picture. On the 53 flights that reported both numbers, the terminal released an average of 31 seats and 13 were taken, so a typical flight on this route left with about 18 Space-A seats empty. That is the tell. With that much room, the roll calls that stopped at a higher category were mostly flights where nobody further down the list was there to take a seat, not flights that turned retirees away.
A schedule on the 72-hour board is a plan, not a promise, and on this route the record says how much of a plan. Of the 30 flights posted to Osan AB's board for Seattle-Tacoma Intl in the last 120 days, 13 (43 percent) disappeared from the board more than twelve hours before they were due to fly, 0 (0 percent) changed their roll-call time after first posting, and 1 (3 percent) changed their seat count. That is a volatile route. Set a watch and check the morning of.
Sign-up at Osan AB is free and does not commit you to anything. You can email the terminal at osanspacea@us.af.mil (the email doubles as your dated proof of sign-up), use the AMC online sign-up portal and call 011-82-505-784-6883 / 011-82-505-784-1854 to confirm anything time-sensitive. Do it 45 to 60 days before you want to travel, because your place in line at roll call is your sign-up date, and a sign-up is good for 60 days.
In the year ending October 2026, Osan AB recorded 62 Space-A flights to Seattle-Tacoma Intl, which works out to about once a week. Firm schedules only appear about 72 hours ahead; the free live boards at spaceascout.com show what is posted now.
In the year ending October 2026, Category VI travelers, which covers retirees and eligible veterans, made the cut on 64 percent of the 50 flights where Osan AB reported a category for this route.
Email osanspacea@us.af.mil with your name, category, number of travelers and desired destinations, or use the AMC online portal. Sign up 45 to 60 days before you want to fly. It is free and the email gives you a dated record.
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Open the live boards for Osan AB
Space-A Scout collects 72-hour schedules, Patriot Express calendars and roll-call results from more than a hundred passenger terminals, refreshed every twenty minutes. It is free and no account is required. Built by Luke Connally, USMC, Retired, who flies Space-A himself. See every route we hold records for, every base, or start with the five-minute primer.