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Most Popular Flight Routes

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What is the cheapest day to fly?: Tuesday and Wednesday are the cheapest days to fly domestically in the US. Airlines release weekend sale prices Monday night, driving fares down 12% below the weekly average on Tues–Wed.
How far in advance should I book a flight?: Book domestic flights 4–8 weeks in advance for the best prices. For international travel, 2–6 months ahead is optimal. Last-minute fares spike 50–80% above average.
Which airlines fly the most US domestic routes?: American Airlines, Delta, United, Southwest, and JetBlue are the five largest US domestic carriers. Southwest and Spirit typically offer the lowest base fares on competitive routes.
How do I find cheap flights?: Use FlightReservationsDesk to compare fares across all airlines. Fly on Tuesday or Wednesday, book 4–8 weeks ahead, travel in shoulder season, and compare nearby airports for the lowest prices.
What is the cheapest month to fly in the US?: January and February are the cheapest months for US domestic flights after the holiday season. September and October also offer below-average fares. Avoid June–August for the lowest prices.