What league is your son playing in?
We went to 2 national tournaments, the Pop Warner championship in Orlando, and the National Youth Sports championship in San Diego, but that was only after we won regional tournaments that involved minor travel for us (we didn't really have to travel to much for those, but we got lucky being in the host area twice of the three times we qualified in the Pop Warner Wescon tournament, but there are only 3 playable states in that region)