The Airbus A350-900 and Boeing 787-9 are very similar aircraft, suited for similar missions. As one would expect, the slightly larger A350-900 has a seat-mile cost advantage, while the 787-9 has an advantage in cost per block hour. These aircraft are competitive, and nearly tie in economic performance.

In the high-stakes widebody market of 2026, the Airbus A350's primary rival and equivalent is the Boeing 787 Dreamliner, particularly the larger 787-10 variant. Both aircraft represent the pinnacle of modern aviation engineering, utilizing carbon-fiber-reinforced polymers to reduce weight and improve fuel efficiency. While the A350-900 is often compared to the 787-9/10, the larger A350-1000 is specifically designed to compete with the Boeing 777X (the 777-8 and 777-9). The A350 typically offers a slightly wider cabin (allowing for more comfortable 9-abreast seating in economy) and a longer range, making it the preferred choice for ultra-long-haul routes like Singapore Airlines' direct flight to New York. In contrast, the 787 family is often cited for its advanced cabin humidity controls and larger windows. Together, these aircraft form the backbone of global long-haul fleets, having largely replaced older, less efficient four-engine jets like the A340 and the Boeing 747.