The Benefits Of Traveling Off-peak The European Environment Information and Observation Network (EIONET) defines traveling off-peak as "traveling outside rush-hours to avoid overcrowding in public means of transport." This sounds all too simple and as we might expect - easier said than done.
For both air and car travel, avoid the crowds by traveling during the week, especially from Tuesday through Thursday. An added bonus is that airfares for travel Tuesday through Thursday are usually cheaper.