Airports › Seattle (SEA) › April 2025
Airport month · April 2025
Seattle/Tacoma International in April 2025
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 April 2025, reporting carriers scheduled 12,716 domestic departures from Seattle/Tacoma International (SEA). 83.0% left less than 15 minutes late and 81.7% reached their destination on time; 0.2% were cancelled.
Nationally that month, 80.6% of flights departed on time and 79.5% arrived on time, so SEA departures were 2.4 points above the national departure figure.
A year earlier, in April 2024, the airport had 12,924 departures with 81.0% leaving on time: a change of +2.0 points, with flights down 2%.
Flights arriving at SEA that month were on time 83.3% of the time (12,723 scheduled arrivals).
Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 42%, late-arriving aircraft 30% and national aviation system 26%.
- On time 81.7%
- Arrived 15+ minutes late 18.0%
- Cancelled 0.2%
- Diverted 0.2%
April 2025 against a year earlier, the airport's year and the nation
| Measure | Apr 2025 | Apr 2024 | SEA, 12 months to Jul 2026 | All reported flights, Apr 2025 |
|---|---|---|---|---|
| Departed on time | 83.0% | 81.0% | 78.2% | 80.6% |
| Arrived on time | 81.7% | 79.8% | 78.6% | 79.5% |
| Cancelled | 0.2% | 0.2% | 0.9% | 0.8% |
| Average departure delay (late minutes only) | 9.7 min | 11.1 min | 13.2 min | 14.1 min |
| Scheduled departures a day | 424 | 431 | 452 | 19,465 |
| Scheduled departures | 12,716 | 12,924 | 164,821 | 583,950 |
Airlines that month
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| AS Alaska Airlines | 5,837 | 46% | 77.7% | 2.7 min | 0.2% |
| DL Delta Air Lines | 2,594 | 20% | 85.9% | -2.9 min | 0.1% |
| OO SkyWest Airlines | 2,227 | 18% | 89.0% | -3.3 min | 0.0% |
| UA United Airlines | 697 | 5% | 82.9% | -0.7 min | 0.1% |
| WN Southwest Airlines | 570 | 4% | 82.6% | 3.5 min | 0.0% |
| AA American Airlines | 450 | 4% | 74.7% | 12.9 min | 1.8% |
| F9 Frontier Airlines | 141 | 1% | 69.5% | 22.4 min | 0.0% |
| HA Hawaiian Airlines | 107 | 1% | 70.1% | 8.1 min | 0.0% |
| NK Spirit Airlines | 62 | 0% | 87.1% | -2.1 min | 1.6% |
| B6 JetBlue Airways | 31 | 0% | 90.3% | -18.8 min | 3.2% |
Busiest routes that month
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| SEA–PHX | Seattle to Phoenix | 664 | 85.1% | 1.1 min | 0.0% |
| SEA–LAX | Seattle to Los Angeles | 587 | 88.4% | -3.5 min | 0.2% |
| SEA–SFO | Seattle to San Francisco | 539 | 78.1% | 1.9 min | 0.4% |
| SEA–LAS | Seattle to Las Vegas | 506 | 82.4% | 1.4 min | 0.2% |
| SEA–ANC | Seattle to Anchorage | 491 | 73.5% | 4.5 min | 0.2% |
| SEA–DEN | Seattle to Denver | 482 | 74.3% | 9.0 min | 0.2% |
| SEA–ORD | Seattle to Chicago | 426 | 79.1% | 4.2 min | 0.5% |
| SEA–DFW | Seattle to Dallas/Fort Worth | 419 | 64.9% | 19.5 min | 1.4% |
| SEA–GEG | Seattle to Spokane | 410 | 84.1% | 0.2 min | 0.2% |
| SEA–PDX | Seattle to Portland | 402 | 85.3% | -1.2 min | 0.0% |
| SEA–SAN | Seattle to San Diego | 366 | 81.1% | 1.0 min | 0.0% |
| SEA–SJC | Seattle to San Jose | 345 | 84.6% | 0.3 min | 0.0% |
By scheduled departure hour
Delay causes
Questions and answers
How many flights left SEA on time in April 2025?
83.0% of 12,716 scheduled domestic departures left less than 15 minutes late, and 81.7% reached their destination on time. The national figures that month were 80.6% and 79.5%.
How does that compare with a year earlier?
In April 2024, 81.0% of 12,924 departures left on time and 0.2% were cancelled, against 83.0% and 0.2% in April 2025.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for April 2025; 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.