Identifying the absolute "cheapest" airport varies by year, but for 2026, Chicago O'Hare (ORD) and Orlando International (MCO) consistently rank as the most budget-friendly hubs in the United States. This is due to the sheer volume of "low-cost carrier" (LCC) competition from airlines like Spirit, Frontier, and Southwest, which forces legacy carriers to keep their prices low. Globally, Lisbon (LIS) and Istanbul (IST) are currently among the most affordable international gateways. Istanbul, in particular, benefits from being the primary hub for Turkish Airlines and Pegasus, offering highly competitive "sixth freedom" fares that connect Europe, Asia, and the Americas. Domestically, airports like Las Vegas (LAS) and Tampa (TPA) also frequently appear at the top of "cheap flight" lists because they are high-traffic tourist destinations with constant seat supply. To find the cheapest airport for your specific trip, you should always check "nearby" secondary airports; for example, flying out of Burbank (BUR) or Long Beach (LGB) can often be cheaper than LAX due to lower airport taxes and faster turnaround times for budget airlines.