Travelers looking to save money on airfare over the Thanksgiving holiday might want to consider getting in early and leaving much later. Travelers can expect to find the lowest prices if they fly out on Monday, Nov. 20 and if they return on Wednesday, Nov. 29, according to a report by Massachusetts-based airfare prediction app Hopper and Rhode Island-based InsureMyTrip, a travel insurance research firm. At midweek this week, domestic flights for Thanksgiving were averaging about $322 for a round-trip…