Western Sydney Airport opens on 25 October with no curfew: between about 5,100 and 18,000 addresses sit in its 2033 night noise contour, depending on the night runway mode
Western Sydney International opens to passengers on Sunday 25 October 2026. Unlike Sydney Airport, it has no curfew: it is designed to run 24 hours a day, and the flight paths authorised in June 2025 have been live in the airspace since 9 July. The government published its own noise modelling for those paths, contour by contour, for three milestone years. We checked every street address in NSW against those contours. The result: by 2033, when the airport reaches its Stage 1 design capacity of 10 million passengers a year, between about 5,056 and 17,963 addresses hear two or more aircraft louder than 60 decibels on an average night, the range depending on whether the quieter night runway mode is preferred. By 2040 the upper figure is 30,716; by 2055, 44,925. On the night paths used without the quiet mode, some 46,955 addresses sit where a single night time Boeing 737 peaks above 60 decibels, and 2,001 where it peaks above 70. With no runway preference, St Marys alone has 6,184 addresses in the 2033 night contour, six in ten of the suburb; where the quiet mode is preferred, it has none. To check a specific address, use our flight path and noise check.
PFPropertyFlags researchOfficial registers, read whole19 Oct 20267 min read
Luddenham · NSW Spatial Services
The numbers
The measure the government uses for night is called N60: the number of aircraft movements louder than 60 decibels that a location hears between 11 pm and 5.30 am on an average night. The published contours start at two events a night. In the 2033 modelling with no runway preference, 17,963 NSW addresses sit inside the two or more band: 13,251 of them at two to four events a night, 3,967 at five to nine, 624 at ten to nineteen and 121 at twenty or more. In the two scenarios where the night runway mode is preferred, the same count is 5,056 (runway 05 preferred by day) or 5,228 (runway 23 preferred by day), with 617 addresses at ten or more events either way.
The range matters, so here is what sits behind it. At night, when traffic is light and the wind is calm with no rain, the airport can run what the brochure calls Reciprocal Runway Operations: aircraft land from the south west and take off towards the south west, away from the most populated parts of western Sydney. The Australian Government has directed Airservices Australia to prioritise that mode at night where possible. The lower figure is what the modelling gives when that preference is applied; the higher figure is what it gives when air traffic control simply nominates the runway on the weather. The modelling already allows for nights when the weather rules the quiet mode out; how often it is actually used after opening is the number nobody has yet.
Growth widens the footprint. The same two or more events contour covers 30,716 addresses in the 2040 modelling (15 million passengers a year) and 44,925 in 2055 (about 37 million passengers, the single runway near capacity), when 18,257 addresses are at ten or more events a night. For the whole 24 hours, the N70 measure (events louder than 70 decibels) puts 2,120 addresses at five or more events a day in 2033 and 236 inside the ANEC 20 contour, the cumulative measure planners use.
A different question is how loud a single aircraft is. The modelling gives the peak level of one overflight at night by a typical domestic jet, a Boeing 737-800. On the night paths used without the quiet mode, 46,955 addresses sit where that peak is 60 decibels or more, 2,001 where it is 70 or more and 166 where it is 80 or more; on the quiet mode paths the first two figures are 4,623 and 1,151. For a typical international widebody, a Boeing 777-300, on the paths without the quiet mode, the 60 decibel area covers 58,830 addresses and the 70 decibel area 6,679. Those are single events, not nightly totals; a street can be inside the 60 decibel peak area and outside every N60 contour because the aircraft that produces the peak passes rarely.
Layer two: the suburbs
Thirty eight NSW suburbs have at least one address inside the 2033 night contour with no runway preference, and the volume sits in a handful of them. St Marys leads with 6,184 of its 10,402 addresses, 59.5%, all at two to four events a night; by 2040 that is 8,782 and by 2055 10,145, close to the whole suburb. Werrington (1,613, 42%), St Clair (1,385, 19%), Hassall Grove (1,110, 75%) and Luddenham (1,044, 89%) follow. The highest nightly counts are closest to the runway: in Luddenham 299 addresses and in Badgerys Creek 238 sit at ten or more events a night, and together with Silverdale, Greendale, Wallacia and Kemps Creek they account for every address in that band. In the two scenarios where the quiet night mode is preferred the suburb picture changes: St Marys, Werrington, St Clair, Mulgoa and 13 smaller suburbs have no addresses in the 2033 night contour, while Hassall Grove keeps 666 to 693 and Luddenham 589 to 610. The quiet mode also brings in eight suburbs south of the airport that are outside the contour with no runway preference: 1,096 addresses between them, led by Brownlow Hill (318), Mount Hunter (262) and Cobbitty (140).
Addresses in the 2033 night contour
Share of the suburb's addresses, %
By share of the suburb the order changes: Badgerys Creek (89%), Luddenham (89%), Mulgoa (81%), Hassall Grove (75%) and Greendale (68%), all small rural localities around the site except Hassall Grove, a Blacktown suburb. Mulgoa is a case worth reading twice: 955 of its 1,175 addresses are in the two or more band and 557 sit where a night time 737 peaks above 70 decibels, yet none are at ten or more events, because the aircraft that pass over it at night are loud but not frequent.
The growth years add suburbs that are barely touched in 2033. Ropes Crossing has three addresses in the 2033 contour, 792 in 2040 and 1,962 in 2055, out of 2,667. Glenmore Park, with 10,132 addresses, has 41 in the 2033 contour and 241 in 2055, but 1,422 sit inside the 60 decibel peak area for a night time 737. Claremont Meadows goes from 457 to 2,030 of 2,218 by 2055; North St Marys from 338 to 1,808; Glendenning from 468 to 1,624.
Layer three: the contour that already binds development
The modelling above is the airport's environmental assessment. A different contour has legal weight today: the ANEC contours in the State Environmental Planning Policy for the Western Parkland City precincts, made in December 2021 and carried on the NSW planning portal. Councils assess noise sensitive development against that layer. It covers 3,667 addresses at ANEC 20 or above, 964 at 25 or above and 311 at 30 or above, across eleven localities: Silverdale (781), Luddenham (692), Horsley Park (673), Badgerys Creek (378 of 379), Kemps Creek (376), Mount Vernon (341), Greendale (154), Bringelly (141), Bradfield (77), Wallacia (50) and Cecil Park (4).
That planning contour is much larger than the 2033 ANEC in the airport's own modelling (236 addresses) or the 2040 one (458), because it was drawn for the airport's longer term development rather than its first decade. Many addresses are outside every 2033 night contour and inside the planning contour at the same time: 1,704 of the 3,667, including 340 of the 341 in Mount Vernon and 608 of the 673 in Horsley Park. Both facts are true; they answer different questions. The first says what an average night in 2033 should sound like. The second says what a council will assume when it assesses the next house on the street.
What this means, and what it does not
It means that a specific, published set of contours now exists for western Sydney, and that the suburbs inside them can be named. Today's quiet in St Marys or Luddenham is not the long term baseline: the first passenger flight is a Jetstar service to the Gold Coast at 11 am on 25 October, Air New Zealand follows on 26 October, Singapore Airlines from 23 November, and from 1 November the airport is intended to open for night movements and become Sydney's airport for overnight freight. The paths these aircraft fly were designed, assessed and authorised before any of them arrive. The quiet night runway mode is a preference, not a rule; it needs calm wind, no rain and light traffic.
It does not mean that every address in a contour will hear every event, or that the counts are measurements. They are the government's model for an average night in a future year, drawn for the preliminary flight path design that was later authorised; the tool that publishes them describes those paths as preliminary and subject to final detailed design. We count G-NAF street addresses, which include units in blocks, not dwellings or people. Addresses, not parcels: a lot on the edge of a contour can test either way.
How we checked. We took the contour files the government's Aircraft Overflight Noise Tool draws on screen (file dates 18 April 2024, and 18 October 2024 for the quiet night mode scenarios), and the planning ANEC layer from the NSW planning portal, and tested the coordinate of every one of the 5,224,232 NSW addresses in the national address file against each polygon. For the planning layer we then asked the NSW planning server itself about 120 addresses, 60 inside and 60 outside: zero disagreements. For the night contour we re-ran 600 addresses through a second, independent point in polygon routine: zero mismatches. The opening date, the night period (11 pm to 5.30 am), the runway mode and the passenger milestones are taken from the Prime Minister's announcement, the department's flight path brochure, its flight paths page and the EIS, all linked below.
What a buyer can do. Enter the address in the government's noise tool, which shows the paths over it and the modelled counts for each year; read the planning ANEC layer for the lot, because that is what the council will apply; and, once night flights begin in November, stand at the address between 11 pm and midnight on a few nights, since the quiet mode depends on the weather that night. A PropertyFlags report reads the planning noise layer and the airport corridor for the exact address, with the flood, bushfire and heritage registers, in under a minute.
The suburb table
Suburbs with 40 or more addresses in the 2033 night contour. N60 night: addresses inside the contour for two or more events louder than 60 decibels between 11 pm and 5.30 am, no runway preference scenario. Peak 737: addresses where a single night time Boeing 737-800 overflight is modelled at 60 decibels or more. Planning ANEC: addresses at ANEC 20 or above in the SEPP contour.
All sources queried or checked on 19 October 2026. If a figure on this page and a source disagree, tell us at hello@propertyflags.com.au and we will correct the page.
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