The Costa Rican "heroes" of the World Cup will be returning on Tuesday, about mid-day, according to news reports.
Anyone flying into SJO that day should be aware that there will be pandemonium and huge crowds. So don't count on things going smoothly. If possible, I would change your flight to another day. Otherwise, just have some patience and understand what a tremendous thing this is for all Costa Rica.
Heck, I might even be there in the crowd welcoming them home!