You may have known that it is cheaper to take a flight on certain days, but did you know that it’s also cheaper to buy airline tickets on certain days as well? Travel experts have attested to the fact that airline prices do actually follow a weekly cycle. Tickets are typically discounted by 15% to 25% on Monday nights, so competitors try to match these prices by Tuesday morning, making Tuesdays and Wednesdays the best time to buy airline tickets.

Two weeks ago, a Chicago-Atlanta round-trip ticket for April travel dates cost $209 on Tuesday and Wednesday on American and Delta, but then $301 for the next four days. When Tuesday rolled around last week, the fare dropped to $219 at both airlines for the April 8-15 itinerary. By Friday it was up to $307 at both American and Delta. Come Tuesday this week, the fare was down to $229.

Tom check out the rest of Smart Money’s informative article, head to When Not to Buy an Airline Ticket.