The Boeing 787 has the largest passenger-window surface area in service today — about 196.8 square inches from a widely cited 10.7-by-18.4-inch pane. But the Airbus A220 is the wider window at 11 inches, beating the 787’s 10.7.
“Largest” has no single winner because no standardized window-measurement protocol exists, and published figures for the same aircraft conflict. The answer changes with the metric you name.
The most confidently repeated fact in the window-size debate is also the least documented. Every list puts the Boeing 787 on top, then quotes 10.7 by 18.4 inches as proof — except when it quotes 11 by 19 instead. Those are not compatible figures for the same pane of glass.
Ask which number traces to a Boeing primary document and the trail goes quiet. Boeing’s own airport-planning manuals cover cabin cross sections and door clearances in depth, yet omit passenger windows entirely. That silence is the real subject here.
This article resolves it the way the rest of the internet does not: metric by metric. Surface area, width, single-aisle versus widebody, and in-service versus announced all produce different winners.
The 787 leads on area. The A220 leads on width. And the Concorde — the fastest airliner ever built — had one of the smallest views in history.
The 787’s window is the area leader, but the spec is thinner than it looks
The 787 window most sources quote measures 10.7 inches by 18.4 inches. Multiply that and you get 196.8 square inches — the largest area repeated for any commercial airliner in active service.
The reason is structural, not stylistic. A composite barrel fuselage can take larger cutouts without the reinforcement an aluminum skin demands, so Boeing designed the aircraft around bigger openings rather than retrofitting them.
But the precision is deceptive. Some outlets put the same window at 11 by 19 inches, and Boeing’s own Airplane Characteristics for Airport Planning manual — ground clearances, cabin cross sections, door sizes, all of it — lists no passenger-window height or width at all. Both quoted numbers come from secondary sources, not a Boeing specification.
Width or area? The A220 flips the winner
The Airbus A220 — the clean-sheet Bombardier CSeries design — carries a widely cited window of 11 inches by 16 inches, computed area 176 square inches. That is less total area than the 787’s 196.8, so on the metric most people mean by “biggest” it still loses.
But its 11-inch width is wider than the 787’s 10.7. If you care about the horizontal vista rather than total pane area, the A220 beats every widebody in the comparison. It is also the largest single-aisle window by a clear margin.
This single-aisle versus widebody split is the ranking most travelers actually need, and most coverage blurs it. The 787 leads widebodies on area; the A220 leads single-aisles and leads on raw width across both categories.
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The A350, the legacy 777, and the 777X’s shaky 29 percent
The Airbus A350‘s window is the largest on any Airbus widebody: 9.5 inches by 13.5 inches, or 128.3 square inches. The legacy Boeing 777 that debuted in 1995 was the era leader at 10 inches by 15 inches, around 150 square inches. Both are smaller than the 787 on area.
Then comes the Boeing 777X, the announced future benchmark. Boeing communications attribute a 162-square-inch window to it, with no disclosed height or width — and describe that as 29 percent larger than the A350’s. The arithmetic does not agree: 162 against roughly 128.3 computes to about 26 percent, not 29.
It gets thinner. Boeing’s airport-planning manual for the 777X omits any passenger-window height-by-width or area spec, and the aircraft had not entered routine commercial passenger service as of mid-2026. So the 162 figure is a marketing estimate, not a certified specification.
The published figures, with their sourcing class
Every number in this debate traces to the same class of evidence: media and technical articles, not primary manufacturer or regulator specifications. The table does not settle “largest”; it shows what is actually published and where it comes from.
| Aircraft type | Published width (inches) | Published height (inches) | Computed area (square inches) | Source class | Conflict or caveat |
|---|---|---|---|---|---|
| Boeing 787 Dreamliner | 10.7 | 18.4 | 196.8 | Media and technical articles repeating Boeing marketing | No Boeing primary document lists 10.7×18.4; figures trace to secondary sources. |
| Airbus A220 (CSeries origin) | 11 | 16 | 176 | Media and technical articles referencing Bombardier/Airbus marketing | Manufacturer documents don’t list window dimensions; 11×16 remains a secondary-source figure. |
| Airbus A350 | 9.5 | 13.5 | 128.3 | Media and technical articles aligned with A350 type-certificate data | EASA type certificate confirms cabin geometry but not 9.5×13.5; figure is industry analysis. |
| Boeing 777 (legacy) | 10 | 15 | 150 | Media and technical articles referencing Boeing marketing and airport-planning materials | Boeing 777 manuals give cabin cross sections, not window height-by-width; 10×15 is secondary. |
| Boeing 777X | (not disclosed) | (not disclosed) | 162 | Media and marketing claims attributed to Boeing communications | ACAPS omits window spec; 162 is a marketing estimate; the 29% claim conflicts with arithmetic. |
| Concorde | ≈6 | ≈9 | ≈54 | Historical technical descriptions and heritage sources | Approximate only; primary documents confirm small windows due to Mach 2 thermal constraints. |
| Source: Boeing Commercial Airplanes; Airbus; European Union Aviation Safety Agency (EASA); International Civil Aviation Organization (ICAO) | |||||
One line deserves attention: the 777X is the only row with “not disclosed” in both dimension columns. An area figure without height or width is not a specification; it is a briefing number.
Why the disagreement is the real answer
No standardized, universally accepted protocol exists for measuring a passenger aircraft window. Boeing’s 787 and 777X airport-planning manuals cover ground clearances and door sizes; EASA’s A350 type-certificate data sheet lists weights, fuel volumes, and crew minimums. Passenger window dimensions appear in none of them.
No authoritative document for the 787, A220, or A350 separately defines the exterior structural cutout versus the interior opening a passenger sees. That distinction matters, because what you look through is not necessarily what the structure was designed around. The same silence applies to older types: the DC-8 and Fokker F27 manufacturer and certification records give fuselage dimensions and door clearances, not comparable window figures.
Concorde makes the structural point in reverse. Its windows were roughly six by nine inches — about postcard size, next to the 787’s printer-paper pane — because Mach 2 heating and pressure left no room for big cutouts. Window size is an engineering trade. The fastest airliner ever built had the smallest view, not as an accident, but as a consequence of speed.
Key terms
- ACAPS
- Airplane Characteristics for Airport Planning, Boeing’s series of technical manuals for airport operators and planners. Each ACAPS document covers an aircraft model’s ground clearances, door sizes, cabin cross sections, and other physical dimensions relevant to gate and taxiway design. For the 787 and 777X, these manuals are the documents that conspicuously omit passenger-window height and width, which is why the widely quoted window figures trace to secondary sources instead.
- Type certificate
- A regulator-issued document confirming that an aircraft design meets airworthiness requirements. In Europe, EASA issues type-certificate data sheets that list certified weights, fuel volumes, crew minimums, and other approved parameters. The A350’s EASA type-certificate data sheet confirms cabin geometry but does not list the 9.5-by-13.5-inch window figure that media outlets repeat.
- Composite barrel fuselage
- A fuselage built as a single-piece carbon-fiber-reinforced polymer cylinder rather than from aluminum panels riveted together. The manufacturing process allows larger structural cutouts with less added reinforcement than a metal skin requires. Boeing used this approach on the 787, which is why the aircraft could be designed around larger passenger windows from the start.
- Mach 2
- Twice the speed of sound, roughly 1,534 mph at cruise altitude depending on temperature. At this speed, an airframe’s skin heats significantly from aerodynamic friction, and the pressurized cabin adds structural load. Concorde’s Mach 2 cruise environment is why its passenger windows were kept to roughly six by nine inches — far smaller than any subsonic widebody’s.
Questions? Answers.
Are 777X windows bigger than 787?
On area, no. The 787’s widely cited 10.7-by-18.4-inch dimensions compute to 196.8 square inches, larger than the 777X’s quoted 162 square inches. The 777X figure also has no disclosed height or width, and arithmetic comparing 162 to roughly 128.3 yields about 26 percent — not the 29 percent often quoted.
Why are the 787 windows so big?
Because the widely cited 10.7-by-18.4-inch figures compute to 196.8 square inches, the largest window area repeated for a current commercial airliner. But no standardized measurement protocol exists to independently confirm that against other aircraft.
Which airplanes have the biggest windows?
On area, the Boeing 787 leads at 196.8 square inches from 10.7-by-18.4-inch dimensions. The Airbus A220 has the widest window and the largest single-aisle pane at 11 by 16 inches, or 176 square inches. The A350’s 9.5-by-13.5-inch window gives 128.3 square inches, and the 777X’s quoted area is 162 square inches without disclosed height or width.
Which commercial airliner had the smallest windows?
The Concorde’s windows were approximately 6 by 9 inches, about 54 square inches. The small cutouts were a consequence of Mach 2 heating and pressure, not a cosmetic choice, according to heritage technical descriptions.
