Business class seat width varies wildly between airlines — the gap between the narrowest and widest in this roundup is nearly 18 inches, or about 46cm. Some carriers have spent that space on enclosed suites with sliding doors; others simply built the widest seat possible. Knowing which is which can make or break a long-haul booking.
At the top sits ANA's 'The Room', fitted to its Boeing 777-300ERs on premium routes out of Tokyo to New York, London, Frankfurt and Los Angeles. At its widest point it measures roughly 38 inches (97cm) — wider than most first class seats. Instead of a pod that reclines into a bed, it's a genuinely rectangular space with a door and a full-width sleeping surface. The trade-off: the aircraft carries just 64 suites, so availability is limited and fares reflect that.
Singapore Airlines takes the opposite route. Its long-haul business seats, around 28-30 inches (71-76cm) wide on the A350 and 777-300ER, are the roomiest of any airline still using an open cabin — no doors, no high walls. Beds run 76-78 inches with mattress pads, duvets and proper pillows. If enclosed suites feel claustrophobic to you, this is the most physical space per seat flying today, though centre pairs only get a divider, not real acoustic privacy.
Qatar Airways' QSuite, launched in 2017, effectively started the door-equipped suite race. QSuite 2.0, rolled out on select A380 and A321XLR routes in late 2025, adds a 6.5-foot double bed — the longest in business class — by combining adjacent suites. Cathay Pacific's Aria Suite, flying on A350-1000s from Hong Kong to London, Los Angeles and Sydney, was named World's Best Business Class at the 2026 AirlineRatings awards: 21 inches at the armrest but flaring to around 25 at the shoulders, with a 79-inch bed and a closing door at every seat.
Delta One Suites have featured sliding doors since 2017, and Delta expects 90% of Delta One seats to have doors by 2030. Seat widths vary by aircraft, from 20 inches on the 767-400ER to 22.5 on the A330-900. A next-generation suite with a 198cm bed and 24-inch screens arrives on the A350-1000 in 2027. Emirates rounds out the list thanks to its new A350 S-Lounge, styled like a Mercedes S-Class interior — but note the legacy A380 business seat is a mere 18.5 inches wide, barely an inch more than economy, and its 777 angle-flat product is dated, though refurbishments are underway.
The takeaway for travellers: if privacy matters most, Qatar, Cathay and ANA lead the way; if sheer width and openness appeal, Singapore is unmatched; and if you're booking Emirates or Delta, the aircraft type matters as much as the airline.
