The number of miles required for a "free" flight depends heavily on the destination, class of service, and whether the airline uses "dynamic pricing." For a standard domestic one-way flight in the United States or India, you typically need between 7,500 and 15,000 miles. For a round-trip international flight, requirements generally jump to 60,000 to 80,000 miles for Economy and over 120,000 miles for Business Class. In 2026, many credit cards offer "Welcome Bonuses" ranging from 50,000 to 100,000 miles, which is often enough to cover at least one major international round-trip. It is important to note that "free" is a relative term; even on award tickets, you are still responsible for paying government-mandated taxes and surcharges, which can range from $5.60 for a US domestic hop to over $800 for a premium cabin flight through a hub like London Heathrow.