Those planning a trip on a budget should bear in mind that flight prices for international and domestic travel in the US tend to increase dramatically in the beginning of July (due to the July 4th Independence Day celebrations, which can last up to a week), around the last week of November (due to the popular Thanksgiving holiday) and between December 23rd to January 7th (for Christmas and New Years’ celebrations). During these dates, flight bookings, airports and other services get much busier.