Airports › Seattle (SEA) › December 2024
Airport month · December 2024
Seattle/Tacoma International in December 2024
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 December 2024, reporting carriers scheduled 12,596 domestic departures from Seattle/Tacoma International (SEA). 79.2% left less than 15 minutes late and 79.9% reached their destination on time; 0.5% were cancelled.
Nationally that month, 77.8% of flights departed on time and 78.1% arrived on time, so SEA departures were 1.4 points above the national departure figure.
A year earlier, in December 2023, the airport had 12,736 departures with 83.4% leaving on time: a change of −4.2 points, with flights down 1%.
Flights arriving at SEA that month were on time 81.3% of the time (12,589 scheduled arrivals).
Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 44%, late-arriving aircraft 24% and national aviation system 23%.
- On time 79.9%
- Arrived 15+ minutes late 19.3%
- Cancelled 0.5%
- Diverted 0.3%
December 2024 against a year earlier, the airport's year and the nation
| Measure | Dec 2024 | Dec 2023 | SEA, 12 months to Jul 2026 | All reported flights, Dec 2024 |
|---|---|---|---|---|
| Departed on time | 79.2% | 83.4% | 78.2% | 77.8% |
| Arrived on time | 79.9% | 82.5% | 78.6% | 78.1% |
| Cancelled | 0.5% | 0.5% | 0.9% | 0.7% |
| Average departure delay (late minutes only) | 12.5 min | 10.3 min | 13.2 min | 16.6 min |
| Scheduled departures a day | 420 | 425 | 452 | 19,686 |
| Scheduled departures | 12,596 | 12,736 | 164,821 | 590,581 |
Airlines that month
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| AS Alaska Airlines | 5,942 | 47% | 77.5% | 3.0 min | 0.4% |
| DL Delta Air Lines | 2,628 | 21% | 82.8% | 0.5 min | 0.0% |
| OO SkyWest Airlines | 2,085 | 17% | 81.3% | 2.5 min | 1.3% |
| UA United Airlines | 645 | 5% | 87.1% | -2.7 min | 0.5% |
| WN Southwest Airlines | 558 | 4% | 81.9% | 3.4 min | 0.0% |
| AA American Airlines | 444 | 4% | 81.3% | 1.2 min | 1.4% |
| F9 Frontier Airlines | 112 | 1% | 84.8% | -1.7 min | 0.0% |
| HA Hawaiian Airlines | 80 | 1% | 48.8% | 23.6 min | 5.0% |
| NK Spirit Airlines | 71 | 1% | 83.1% | 9.6 min | 0.0% |
| B6 JetBlue Airways | 31 | 0% | 35.5% | 36.9 min | 0.0% |
Busiest routes that month
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| SEA–LAX | Seattle to Los Angeles | 642 | 82.2% | 0.9 min | 0.5% |
| SEA–PHX | Seattle to Phoenix | 609 | 79.1% | 2.2 min | 0.3% |
| SEA–SFO | Seattle to San Francisco | 532 | 72.4% | 8.9 min | 0.4% |
| SEA–ANC | Seattle to Anchorage | 513 | 79.9% | -0.9 min | 0.0% |
| SEA–LAS | Seattle to Las Vegas | 497 | 82.7% | 2.2 min | 0.0% |
| SEA–DEN | Seattle to Denver | 469 | 86.6% | -2.1 min | 0.2% |
| SEA–DFW | Seattle to Dallas/Fort Worth | 445 | 76.4% | 6.0 min | 1.8% |
| SEA–GEG | Seattle to Spokane | 436 | 75.9% | 7.3 min | 0.5% |
| SEA–SAN | Seattle to San Diego | 390 | 73.8% | 7.3 min | 1.5% |
| SEA–PDX | Seattle to Portland | 373 | 81.0% | 2.4 min | 0.3% |
| SEA–ORD | Seattle to Chicago | 366 | 84.2% | -2.0 min | 0.3% |
| SEA–SJC | Seattle to San Jose | 346 | 80.3% | 3.2 min | 0.0% |
By scheduled departure hour
Delay causes
Questions and answers
How many flights left SEA on time in December 2024?
79.2% of 12,596 scheduled domestic departures left less than 15 minutes late, and 79.9% reached their destination on time. The national figures that month were 77.8% and 78.1%.
How does that compare with a year earlier?
In December 2023, 83.4% of 12,736 departures left on time and 0.5% were cancelled, against 79.2% and 0.5% in December 2024.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for December 2024; 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.