If you know the airport you will both be meeting at, then look for flight arrivals at that airport on the day of the week you will be arriving, also best if you choose the right time.
e.g. flight arrivals now Barcelona http://www.barcelona-airport.com/eng/arrivals.php
there is a option there for the earlier times of the same day
Best you do it on the day you intend to travel, i.e. if a Friday, do it on a Friday or if a Saturday do it on Saturday.
Be aware some airports have more than 1 terminal, when meeting up.
For return, Flight Departures (with the name of the airport)
Remember to both have mobiles charged, so you can either send each other sms in case of flight delays, or at the gate to say flight leaving on time