Airports › Seattle (SEA) › June 2026
Airport month · June 2026
Seattle/Tacoma International in June 2026
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 June 2026, reporting carriers scheduled 15,402 domestic departures from Seattle/Tacoma International (SEA). 74.0% left less than 15 minutes late and 77.6% reached their destination on time; 0.5% were cancelled.
Nationally that month, 72.2% of flights departed on time and 72.8% arrived on time, so SEA departures were 1.8 points above the national departure figure.
A year earlier, in June 2025, the airport had 15,695 departures with 71.7% leaving on time: a change of +2.3 points, with flights down 2%.
Flights arriving at SEA that month were on time 76.9% of the time (15,394 scheduled arrivals).
Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 39%, late-arriving aircraft 35% and national aviation system 24%.
- On time 77.6%
- Arrived 15+ minutes late 21.7%
- Cancelled 0.5%
- Diverted 0.2%
June 2026 against a year earlier, the airport's year and the nation
| Measure | Jun 2026 | Jun 2025 | SEA, 12 months to Jul 2026 | All reported flights, Jun 2026 |
|---|---|---|---|---|
| Departed on time | 74.0% | 71.7% | 78.2% | 72.2% |
| Arrived on time | 77.6% | 70.2% | 78.6% | 72.8% |
| Cancelled | 0.5% | 0.6% | 0.9% | 1.6% |
| Average departure delay (late minutes only) | 15.5 min | 16.0 min | 13.2 min | 20.6 min |
| Scheduled departures a day | 513 | 523 | 452 | 20,253 |
| Scheduled departures | 15,402 | 15,695 | 164,821 | 607,577 |
Airlines that month
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| AS Alaska Airlines | 7,142 | 46% | 77.7% | 2.7 min | 0.5% |
| DL Delta Air Lines | 2,886 | 19% | 81.1% | 2.0 min | 0.5% |
| OO SkyWest Airlines | 2,519 | 16% | 84.4% | 0.1 min | 0.2% |
| WN Southwest Airlines | 919 | 6% | 58.7% | 17.9 min | 0.1% |
| UA United Airlines | 915 | 6% | 72.6% | 9.1 min | 0.5% |
| AA American Airlines | 707 | 5% | 71.1% | 26.1 min | 1.8% |
| F9 Frontier Airlines | 143 | 1% | 71.3% | 11.7 min | 2.1% |
| MQ Envoy Air | 93 | 1% | 90.3% | 1.2 min | 0.0% |
| B6 JetBlue Airways | 78 | 1% | 51.3% | 28.0 min | 0.0% |
Busiest routes that month
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| SEA–ANC | Seattle to Anchorage | 665 | 75.6% | 5.4 min | 0.5% |
| SEA–LAX | Seattle to Los Angeles | 651 | 84.6% | -1.6 min | 0.5% |
| SEA–DEN | Seattle to Denver | 635 | 71.2% | 8.6 min | 1.1% |
| SEA–SFO | Seattle to San Francisco | 633 | 38.9% | 32.7 min | 0.8% |
| SEA–ORD | Seattle to Chicago | 582 | 70.6% | 18.5 min | 1.7% |
| SEA–PHX | Seattle to Phoenix | 569 | 77.3% | 4.6 min | 0.2% |
| SEA–DFW | Seattle to Dallas/Fort Worth | 491 | 67.4% | 24.3 min | 1.6% |
| SEA–LAS | Seattle to Las Vegas | 476 | 80.0% | 3.6 min | 0.0% |
| SEA–SAN | Seattle to San Diego | 436 | 72.7% | 4.8 min | 0.7% |
| SEA–SMF | Seattle to Sacramento | 408 | 83.8% | -0.4 min | 0.0% |
| SEA–PDX | Seattle to Portland | 403 | 81.9% | 2.5 min | 0.0% |
| SEA–SJC | Seattle to San Jose | 402 | 76.1% | 3.3 min | 0.2% |
By scheduled departure hour
Delay causes
Questions and answers
How many flights left SEA on time in June 2026?
74.0% of 15,402 scheduled domestic departures left less than 15 minutes late, and 77.6% reached their destination on time. The national figures that month were 72.2% and 72.8%.
How does that compare with a year earlier?
In June 2025, 71.7% of 15,695 departures left on time and 0.6% were cancelled, against 74.0% and 0.5% in June 2026.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for June 2026; 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.