Cheap fare buckets may already be gone
Airlines usually open several price levels rather than one uniform fare. As lower classes sell out or close, the next available ticket becomes more expensive.
Late demand is often less price-sensitive
Business trips, family emergencies and fixed-date events can produce passengers who need a particular flight. Airlines know these customers may prioritize timing over price.
A nearly full flight gives the airline little reason to discount
When remaining capacity is scarce, holding seats for higher-paying demand can be rational. The potential revenue from one late premium booking may exceed the value of several early discounts.
Some weak flights do get cheaper
If demand underperforms, airlines can reopen lower inventory, launch promotions or reduce fares. Last-minute bargains exist, but they are a response to specific demand conditions rather than a universal rule.
Flexible tickets exaggerate the late-price effect
Travelers booking shortly before departure may also choose fares with change or refund rights. Those features can make the quoted price look even farther from an early restrictive fare.
Advance purchase is one signal among many
Season, day of week, events, competition and route type all matter. Booking early improves choice but does not guarantee the lowest possible fare.
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