Can I check in online to all my flights and people in the reservation?
You can check in 36 hours prior to your departure for all Finnair-operated flights departing from Finland, and most Finnair flights departing from abroad. For flights to/from the USA, check-in opens 24 hours before departure.
You can also check-in several people at the same time online. If people are in the same reservation, select the passengers that you want to check in from the list displayed. If you want to check in passengers in a different reservation, you will be asked for the reservation code.
Read more about check-in on Finnair flights