Flight profile · Delta Air Lines
DL1239
Seattle (SEA) to Salt Lake City (SLC) · scheduled 7:30 PM – 10:15 PM
How DL1239 performs
561 operations, 2024-06-07 to 2026-06-29.
Source: US DOT Bureau of Transportation Statistics · 561 operations between 2024-06-07 to 2026-06-29
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| DL1239 | 83.0% | 0.18% | -8 min | 5.0% | 561 |
| Delta Air Lines on SEA → SLC | 87.9% | 0.38% | -9 min | 3.3% | 6,613 |
| All SEA → SLC flights | 83.7% | 0.66% | -7 min | 3.9% | 11,934 |
Source: FlyerIntel analysis of US DOT BTS data · 2024-06-07 to 2026-06-29
Other routes DL1239 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| ATL→JFK Atlanta to New York | 2023-07-01 – 2024-06-06 | 199 | 80.1% |
| IAH→LGA Houston to New York | 2024-04-09 – 2024-05-06 | 28 | — |
| LGA→IAH New York to Houston | 2024-03-10 – 2024-04-08 | 30 | — |
| IAH→SLC Houston to Salt Lake City | 2024-01-08 – 2024-03-09 | 52 | — |
| SLC→IAH Salt Lake City to Houston | 2024-01-09 – 2024-03-08 | 35 | — |
Because the same number has served different journeys, the statistics above describe only the route DL1239 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 561 records of DL1239 operating SEA → SLC, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.