Finnair will expand its summer Helsinki-Miami service to be year-round starting in April.
Juha Jarvinen, Finnair's chief commercial officer, said the service had proven to be popular both with the carrier's Northern European customers and its Miami-based passengers.
The service will operate three times a week.
Finnair is also adding frequencies to Chicago by increasing the weekly flights from three last summer to five in summer 2016.
Both destinations are served with Finnair Airbus A330 aircraft.
The flights to Miami International Airport are operated on Mondays, Thursdays and Sundays, and the flights to Chicago O'Hare are operated from Helsinki on Mondays, Thursdays, Fridays, Saturdays and Sundays.
In addition to Miami and Chicago, Finnair operates daily to New York Kennedy.