Is it true that flights are cheaper on Tuesdays?

Not as a general rule. The question can mean buying a ticket on Tuesday or taking a flight on Tuesday. Those are different comparisons, and neither supports a universal Tuesday discount.

Google's October 2026 analysis of U.S. departures found Wednesday was the cheapest booking day, with only a 1.4% difference from Sunday. Its travel-date comparison found lower averages for Monday departures with Tuesday or Wednesday returns. Separately, Expedia's Canadian report identified Monday as the cheapest booking day overall, Thursday for international departures and Friday for domestic departures.

These are historical averages for specific markets and datasets, not guarantees for an individual itinerary. Tuesday travel can be cheaper in some comparisons, but the claim omits the distinction between booking and flying and the variation between markets.