How far can the 737 max fly?

Boeing publishes a single range figure for each MAX at a standard set of assumptions, and the pattern is the one every stretch imposes: the longer the fuselage, the more seats and the less range. The MAX 7 reaches 3,800 nmi (7,040 km), the MAX 8 3,550 nmi (6,570 km), the MAX 9 3,300 nmi (6,110 km) and the MAX 10 3,100 nmi (5,740 km). All four carry essentially the same fuel volume; what changes is the empty weight and the payload that has to be lifted within a fixed maximum take-off weight.

A brochure range is not a promise. It is calculated with a typical two-class passenger load and their bags, standard reserves, no headwind and an optimum cruise profile. Fill the cabin to the limit or load the belly with freight and the aircraft runs out of take-off weight before it runs out of tank space, so range falls. A short, hot or high runway does the same thing by capping the weight at which the aircraft can legally get airborne, which is why some departures leave with deliberately restricted payload.

On paper 3,550 nmi covers London to the US east coast, Dublin to the American Midwest or much of the Atlantic, and airlines have used the MAX exactly that way to open thin long routes that could never fill a widebody. In practice the westbound crossing against the jet stream sits close to the comfortable limit, so schedules are built with seasonal caps or a technical stop in mind. Within Asia, Europe or the Americas, range is almost never the binding constraint on how the aircraft is used.