Airports › Seattle (SEA) › March 2025
Airport month · March 2025
Seattle/Tacoma International in March 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 March 2025, reporting carriers scheduled 12,577 domestic departures from Seattle/Tacoma International (SEA). 82.2% left less than 15 minutes late and 82.0% reached their destination on time; 0.4% were cancelled.
Nationally that month, 79.9% of flights departed on time and 79.3% arrived on time, so SEA departures were 2.3 points above the national departure figure.
A year earlier, in March 2024, the airport had 12,627 departures with 80.5% leaving on time: a change of +1.7 points, with flights down 0%.
Flights arriving at SEA that month were on time 81.9% of the time (12,572 scheduled arrivals).
Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 39%, late-arriving aircraft 31% and national aviation system 25%.
- On time 82.0%
- Arrived 15+ minutes late 17.5%
- Cancelled 0.4%
- Diverted 0.2%
March 2025 against a year earlier, the airport's year and the nation
| Measure | Mar 2025 | Mar 2024 | SEA, 12 months to Jul 2026 | All reported flights, Mar 2025 |
|---|---|---|---|---|
| Departed on time | 82.2% | 80.5% | 78.2% | 79.9% |
| Arrived on time | 82.0% | 79.8% | 78.6% | 79.3% |
| Cancelled | 0.4% | 0.3% | 0.9% | 1.2% |
| Average departure delay (late minutes only) | 10.5 min | 12.3 min | 13.2 min | 14.9 min |
| Scheduled departures a day | 419 | 421 | 452 | 20,029 |
| Scheduled departures | 12,577 | 12,627 | 164,821 | 600,872 |
Airlines that month
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| AS Alaska Airlines | 5,724 | 46% | 78.6% | 2.2 min | 0.4% |
| DL Delta Air Lines | 2,592 | 21% | 86.5% | -4.4 min | 0.3% |
| OO SkyWest Airlines | 2,294 | 18% | 84.9% | 0.9 min | 0.2% |
| UA United Airlines | 660 | 5% | 85.8% | -1.1 min | 0.2% |
| WN Southwest Airlines | 552 | 4% | 82.1% | 2.5 min | 0.2% |
| AA American Airlines | 440 | 3% | 83.4% | 1.4 min | 1.4% |
| F9 Frontier Airlines | 149 | 1% | 73.8% | 10.1 min | 1.3% |
| HA Hawaiian Airlines | 75 | 1% | 65.3% | 21.0 min | 1.3% |
| NK Spirit Airlines | 57 | 0% | 89.5% | -4.6 min | 0.0% |
| B6 JetBlue Airways | 31 | 0% | 71.0% | 5.9 min | 0.0% |
| MQ Envoy Air | 3 | 0% | 100.0% | -36.3 min | 0.0% |
Busiest routes that month
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| SEA–PHX | Seattle to Phoenix | 683 | 81.0% | 4.2 min | 0.3% |
| SEA–LAX | Seattle to Los Angeles | 609 | 84.1% | -1.6 min | 1.0% |
| SEA–SFO | Seattle to San Francisco | 560 | 73.0% | 10.4 min | 0.5% |
| SEA–LAS | Seattle to Las Vegas | 506 | 81.4% | 3.6 min | 0.2% |
| SEA–ANC | Seattle to Anchorage | 476 | 84.5% | -3.7 min | 0.4% |
| SEA–DEN | Seattle to Denver | 473 | 83.9% | -0.5 min | 0.0% |
| SEA–DFW | Seattle to Dallas/Fort Worth | 425 | 78.8% | 3.0 min | 0.9% |
| SEA–GEG | Seattle to Spokane | 424 | 80.7% | 5.3 min | 0.0% |
| SEA–PDX | Seattle to Portland | 410 | 84.6% | -0.9 min | 0.0% |
| SEA–SAN | Seattle to San Diego | 354 | 80.2% | 0.6 min | 0.6% |
| SEA–SJC | Seattle to San Jose | 349 | 81.1% | 1.2 min | 0.6% |
| SEA–BOI | Seattle to Boise | 334 | 82.6% | 0.7 min | 0.3% |
By scheduled departure hour
Delay causes
Questions and answers
How many flights left SEA on time in March 2025?
82.2% of 12,577 scheduled domestic departures left less than 15 minutes late, and 82.0% reached their destination on time. The national figures that month were 79.9% and 79.3%.
How does that compare with a year earlier?
In March 2024, 80.5% of 12,627 departures left on time and 0.3% were cancelled, against 82.2% and 0.4% in March 2025.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for March 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.