The idea that flights become cheapest at a particular hour on Tuesday refuses to die. Modern airfare is dynamic. Prices change with demand, inventory, route competition, season, cabin and how close the departure date is.
Route-specific prices beat universal rules
A “best day to book” average cannot know whether your trip falls on a holiday weekend, major event or unusually competitive route. Start with the actual date range and nearby alternatives.
Let the tool watch the fare when you are not watching
Google Flights can track prices for selected dates and notify you about meaningful changes. That is more useful than manually refreshing every Tuesday morning.
Moving the flight can save more than changing booking day
Check nearby dates, alternate airports and nonstop versus connecting itineraries. A small schedule change can move you away from a demand peak.
Base fare is not the trip price
Check baggage, seat selection, airport transfers, change rules and refundability. A cheaper fare can become the more expensive option once required extras are included.
The goal is a good fare, not proof you found the absolute bottom
Decide what price you are comfortable paying. If the fare reaches that level and the trip matters, booking can be rational even if the price later falls slightly.
Airfare strategy is monitoring + flexibility + total cost
Waiting for a mythical Tuesday creates the illusion of control. Track the route, understand the fare and buy when the combination fits the trip.