Airports › Seattle (SEA) › September 2023
Airport month · September 2023
Seattle/Tacoma International in September 2023
BTS: A flight is counted as on time if it arrived less than 15 minutes after its scheduled time. Only carriers with at least 0.5 percent of domestic scheduled passenger revenue report.
In September 2023, reporting carriers scheduled 15,041 domestic departures from Seattle/Tacoma International (SEA). 82.6% left less than 15 minutes late and 80.8% reached their destination on time; 0.4% were cancelled.
Nationally that month, 80.5% of flights departed on time and 80.1% arrived on time, so SEA departures were 2.1 points above the national departure figure.
Flights arriving at SEA that month were on time 83.9% of the time (15,057 scheduled arrivals).
Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 48%, late-arriving aircraft 28% and national aviation system 20%.
- On time 80.8%
- Arrived 15+ minutes late 18.7%
- Cancelled 0.4%
- Diverted 0.2%
September 2023 against a year earlier, the airport's year and the nation
| Measure | Sep 2023 | Year earlier | SEA, 12 months to Jul 2026 | All reported flights, Sep 2023 |
|---|---|---|---|---|
| Departed on time | 82.6% | — | 78.2% | 80.5% |
| Arrived on time | 80.8% | — | 78.6% | 80.1% |
| Cancelled | 0.4% | — | 0.9% | 1.2% |
| Average departure delay (late minutes only) | 10.6 min | — | 13.2 min | 14.1 min |
| Scheduled departures a day | 501 | — | 452 | 18,978 |
| Scheduled departures | 15,041 | — | 164,821 | 569,338 |
Airlines that month
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| AS Alaska Airlines | 7,348 | 49% | 79.8% | 3.5 min | 0.2% |
| DL Delta Air Lines | 2,879 | 19% | 84.8% | 1.8 min | 0.7% |
| OO SkyWest Airlines | 2,248 | 15% | 85.9% | 1.2 min | 0.0% |
| UA United Airlines | 831 | 6% | 80.1% | 4.0 min | 0.8% |
| WN Southwest Airlines | 742 | 5% | 70.6% | 9.4 min | 0.1% |
| AA American Airlines | 558 | 4% | 78.7% | 16.2 min | 0.7% |
| F9 Frontier Airlines | 144 | 1% | 72.9% | 9.2 min | 0.7% |
| B6 JetBlue Airways | 129 | 1% | 48.1% | 72.7 min | 3.1% |
| NK Spirit Airlines | 77 | 1% | 67.5% | 6.4 min | 3.9% |
| HA Hawaiian Airlines | 60 | 0% | 85.0% | -1.2 min | 1.7% |
| MQ Envoy Air | 25 | 0% | 76.0% | 12.1 min | 0.0% |
Busiest routes that month
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| SEA–LAX | Seattle to Los Angeles | 707 | 78.8% | 6.5 min | 0.3% |
| SEA–ANC | Seattle to Anchorage | 694 | 81.8% | -1.6 min | 0.0% |
| SEA–PHX | Seattle to Phoenix | 604 | 77.3% | 6.6 min | 0.2% |
| SEA–DEN | Seattle to Denver | 602 | 80.1% | 3.4 min | 0.2% |
| SEA–PDX | Seattle to Portland | 595 | 84.0% | 1.8 min | 0.0% |
| SEA–LAS | Seattle to Las Vegas | 581 | 74.0% | 7.7 min | 0.9% |
| SEA–SFO | Seattle to San Francisco | 566 | 77.2% | 5.0 min | 0.5% |
| SEA–GEG | Seattle to Spokane | 555 | 80.2% | 6.5 min | 0.2% |
| SEA–ORD | Seattle to Chicago | 494 | 78.5% | 5.1 min | 0.0% |
| SEA–SJC | Seattle to San Jose | 419 | 83.1% | 1.6 min | 0.0% |
| SEA–SAN | Seattle to San Diego | 405 | 82.5% | 2.9 min | 0.5% |
| SEA–BOI | Seattle to Boise | 402 | 86.3% | 1.7 min | 0.0% |
By scheduled departure hour
Delay causes
Questions and answers
How many flights left SEA on time in September 2023?
82.6% of 15,041 scheduled domestic departures left less than 15 minutes late, and 80.8% reached their destination on time. The national figures that month were 80.5% and 80.1%.
How does that compare with a year earlier?
September 2022 is outside the 36 months on file, or the airport had too few reported flights that month.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for September 2023; public domain. Domestic scheduled flights by reporting carriers, totals and averages only. The site's data runs through July 2026. Full record for SEA · methodology · corrections.