O12 in 20 seconds
Grand Lake St Marys Seaplane Base serves St Marys, US.
AirportRoutes · updated Mar 24, 2026
Traveler reviews & tips
From people who've recently flown through St Marys.
Rate this airport:
No tips for O12 yet — be the first to help fellow travelers.
Share your tip or review
Help fellow travelers at Grand Lake St Marys Seaplane Base. Tips are reviewed before publishing.
Common questions about O12
Quick answers, straight from the schedule data.
Where is Grand Lake St Marys Seaplane Base located?
Grand Lake St Marys Seaplane Base is located in St Marys, US, at an elevation of 871 ft. Its IATA code is — and ICAO code is O12.