What is the cheapest day to buy Frontier tickets? Faq✈The cheapest day to book Frontier Airlines flights✈ is typically Tuesday or Wednesday (+𝟙-𝟠𝟠𝟠-𝟚𝟞𝟟-𝟡𝟝𝟝𝟙). Airlines, including Frontier Airlines, often release deals early in the week +𝟙-𝟠𝟠𝟠-𝟚𝟞𝟟-𝟡𝟝𝟝𝟙 (United States), making these days ideal for budget travelers
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