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Late Night Noise Limitation Program

aircraft taking off at night at sea-tac airport

About the late night noise limitation program

The Late Night Noise Limitation Program is a new, voluntary Port of Seattle program designed to reduce late night noise at SEA Airport by encouraging air carriers to fly during less noise-sensitive hours or transition to quieter aircraft.  The program was developed to increase air carrier awareness of the impact of aircraft noise on local communities.  

  • Focuses on the hours of 12:00 a.m. to 5:00 a.m. to help alleviate late night aircraft noise within the community
  • Captures noise levels for any take-offs and landings between these hours using four close-in airport noise monitors; noise level data collection began July 1, 2019
  • Reports out any exceedances of noise thresholds to the public and air carriers on a quarterly basis
  • Beginning in 2020, a penalty score will be assigned as part of the Port’s Fly Quiet Incentive Program if an operation exceeds an established noise threshold
  • Single Event Noise Exposure Level (SEL) is the metric the program uses to measure aircraft noise at the four monitors. SEL is measured in decibels and represents the total sound energy from an aircraft operation at a given location.

Noise monitors

The Late Night Noise Limitation Program is an outcome of the Sea-Tac Stakeholder Advisory Round Table (StART).  StART, formed in 2018, brings together the Port, FAA, air carriers, and local airport communities to support collaborative dialogue on airport-related issues and to identify practical solutions to reduce the airport’s impacts on local communities.

location of noise monitors used for late night noise limitations program
Noise Monitors and Noise Thresholds used for Late Night Noise Limitation Program

The four close-in monitors used to capture noise are monitors 12 and 13 north of the runways and18 and 19 south of the runways.

To expand the Noise Monitor Map and view the established noise threshold at each monitor, please click the map. Learn more about the Port's Aircraft Noise Monitor System.

For any questions, comments or concerns regarding Airport Noise, please contact the Airport Noise Programs Office by phone at 1 (800) 826-1447, (206) 787-5393 or by contacting us using our comment form.

1st quarter, 2022 late night noise limitation program report

All airlines with late night operations that exceeded noise thresholds during the quarter are displayed below along with their late night total operations and the exceedance percentage of their late night total operations. They are ranked from the most exceedances to the fewest.  For a more detailed look at the specific operations that exceeded thresholds along with a list of all airlines that operated during these hours, please view Full Report.


Download Full Report

Airlines with exceedances during late night hours in the 1st quarter, 2022

Airline Name


Total Late Night Operations

Total Number of Exceedances

Percent of Exceeding Operations

FedEx Express CRG 89 56 63%
ATI (Amazon Prime Air) CRG 485 32 7%
Asiana Airlines Cargo CRG 33 28 85%
China Cargo Airlines CRG 65 28 43%
China Airlines Cargo CRG 26 17 65%
Cargolux CRG 21 14 67%
Korean Air Cargo CRG 22 13 59%
Hainan Airlines CRG 11 8 73%
Alaska Airlines PAX 610 6 1%
Delta Airlines PAX 372 5 1%
ABX Air CRG 4 2 50%
OmniAir PAX 16 2 13%
Kalitta Air CRG 5 1 20%
Aerologic CRG 13 1 8%
United Airlines PAX 101 1 1%
Southwest Airlines PAX 132 1 1%

*Operation type is indicated with "PAX" for passenger airline carrier or "CRG" for cargo airline carrier

Airlines with no operations during late night hours in 1st quarter, 2022:

Lufthansa, Japan Airlines, All Nippon Airlines, Emirates Airlines, British Airways, Atlas Air, Virgin Atlantic, Jazz Aviation, Iceland Air, Spirit Airlines, Qatar Airways, Air France, Singapore Airlines, Air Canada

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