Choose an arrival window, not an exact minute
Flights from different origins rarely line up perfectly. Decide how much arrival spread the group can comfortably accept, then compare options inside that window.
Account for what happens after landing
An arrival time on the schedule is not the same as being ready to leave the airport. International arrivals, checked baggage and terminal distance can change who is actually first to the meeting point.
Balance price against the arrival spread
A cheaper itinerary may create hours of waiting for the rest of the group. Compare the savings with the inconvenience of the wider arrival window.
Protect the traveler with the hardest route
If one origin has limited service, build the shared arrival target around that traveler instead of forcing an unrealistic schedule.
Have a meeting plan at the destination
Agree on the terminal, pickup point or first meeting location before departure so small delays do not restart the coordination problem after everyone lands.