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The 787-8 is designed to seat 234 passengers in a three-class setup, 240 in two-class domestic configuration, and 296 passengers in a high-density economy arrangement. Seat rows can be arranged in four to six abreast in first or business (e.g., 1–2–1, 2–2–2), with eight or nine abreast in economy (e.g., 3–2–3, 2–4–2, 3–3–3). Typical seat room ranges from 46 to 61 in (120 to 150 cm) pitch in first, 36 to 39 in (91 to 99 cm) in business, and 32 to 34 in (81 to 86 cm) in economy.

Cabin interior width is approximately 18 feet (550 cm) at armrest, 1 inch (2.5 cm) more than originally planned, and 15 inches (38 cm) more than that of the Airbus A330 and A340, while 5 inches (13 cm) less than the A350 and 16 in (41 cm) less than the 777. In an industry where economy seats range from 16.3 in (41 cm) to 20.6 in (52 cm) in width; 787 economy seats are 17.18 inches (43.6 cm) and 18.5 inches (47 cm) wide in nine and eight-abreast arrangements, respectively. Most airlines are expected to select the 3–3–3 maximum passenger density configuration. Boeing engineers designed the 787 interior to better accommodate persons with mobility, sensory, and cognitive disabilities. For example, a 56-inch (142 cm) by 57-inch (145 cm) convertible lavatory includes a movable center wall that allows two separate lavatories to become one large, wheelchair-accessible facility.