Moderator: British Airways Executive Club, Iberia Airlines, Airport Lounges and Environmentally Friendly Travel
Join Date: Jan 2003
Location: London, UK
Posts: 22,212
Too tight for my comfort...
Assuming you are making this connection on a single ticket, your baggage (if applicable) will be tagged at ATH through to your final destination.
Breaking down this connection:
Gate to T5 Flight Connections: 10-20 minutes depending on where you're seated;
Bus from T5 to T4: 20-25 minutes;
Security at T4 Flight Connections: 10-15 minutes;
T4 Flight Connections to Gate: 10 minutes;
Considering boarding of the CO flight will close between 30-40 minutes before departure, this leaves no room for mishaps or delays.