No matter what day you book, flying during "shoulder seasons" (like late April or September) will almost always beat prices found during peak summer or holiday periods.
To truly find the lowest fare, rely on tools rather than traditions: what is the cheapest day to buy plane tickets
For years, the gold standard for booking was Tuesday at midnight. This originated because airlines often announced sales on Monday evenings, and competitors would scramble to match those prices by Tuesday morning. While you can still find deals on Tuesdays, automated pricing algorithms now update costs in real-time based on demand, meaning a "deal" can pop up—and disappear—at any hour of any day. Booking Window vs. Purchase Day No matter what day you book, flying during