Optimal airfare savings of approximately 25% are found by booking 1–3 months in advance for domestic flights and 3–6 months for international travel, according to 2025/2026 data. While specific booking days matter less due to dynamic pricing, Sunday, Saturday, or midweek bookings generally offer lower rates. Read the full analysis at Forbes . AI responses may include mistakes. Learn more The Best Days to Book a Flight and When to Fly - NerdWallet