Наш рейс был в 6 часов утра, поэтом

Наш рейс был в 6 часов утра, поэтому мы должны были выехать из дома в 3 часа.

Results (English) 1:

Our flight was at 6:00 in the morning, so we had to leave home at 3:00.

Results (English) 2:

Our flight was at 6 am, so we had to leave home at 3 o'clock.

Results (English) 3:

our flight was at 6 o'clock in the morning, so we had to leave home in three hours.