Flight profile · Delta Air Lines
DL505
Minneapolis (MSP) to Seattle (SEA) · scheduled 9:59 PM – 11:59 PM
How DL505 performs
405 operations, 2024-06-07 to 2026-06-30.
DL505 arrived on time 79.9% of the time, against 84.2% for all MSP → SEA flights — this specific departure is 4.2 percentage points worse than the route as a whole. Against Delta Air Lines’s own flights on this route it is 6.1 points worse.
Source: US DOT Bureau of Transportation Statistics · 405 operations between 2024-06-07 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| DL505 | 79.9% | 1.48% | -9 min | 5.3% | 405 |
| Delta Air Lines on MSP → SEA | 86.1% | 0.50% | -11 min | 3.7% | 5,252 |
| All MSP → SEA flights | 84.2% | 0.68% | -10 min | 3.9% | 8,053 |
Source: FlyerIntel analysis of US DOT BTS data · 2024-06-07 to 2026-06-30
Other routes DL505 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 |
|---|---|---|---|
| FLL→BOS Fort Lauderdale to Boston | 2026-02-12 – 2026-03-07 | 24 | — |
| ATL→AUS Atlanta to Austin | 2026-01-19 – 2026-02-11 | 24 | — |
| AUS→ATL Austin to Atlanta | 2026-01-19 – 2026-02-11 | 24 | — |
| MCO→JFK Orlando to New York | 2026-01-10 – 2026-01-17 | 2 | — |
| ATL→TUL Atlanta to Tulsa | 2025-12-20 – 2026-01-04 | 16 | — |
| BOS→SAV Boston to Savannah | 2025-06-14 – 2025-08-09 | 9 | — |
| SAV→BOS Savannah to Boston | 2025-06-14 – 2025-08-09 | 9 | — |
| ATL→RAP Atlanta to Rapid City | 2025-05-24 – 2025-06-07 | 3 | — |
| RAP→ATL Rapid City to Atlanta | 2025-05-24 – 2025-06-07 | 3 | — |
| BOS→LGA Boston to New York | 2025-04-26 – 2025-05-03 | 2 | — |
| DCA→ATL Washington to Atlanta | 2024-12-19 – 2024-12-20 | 2 | — |
| ATL→LGA Atlanta to New York | 2023-07-01 – 2024-06-06 | 222 | 84.2% |
| PDX→ATL Portland to Atlanta | 2024-04-09 – 2024-05-06 | 28 | — |
| LAS→BOS Las Vegas to Boston | 2024-03-10 – 2024-04-08 | 30 | — |
| DTW→SEA Detroit to Seattle | 2024-01-08 – 2024-03-09 | 62 | — |
Because the same number has served different journeys, the statistics above describe only the route DL505 currently operates. Blending them would produce an average of two different flights.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
36 min late
against a median of 9 min early
Percentiles over 405 operations. Cancelled and diverted flights have no arrival time and are counted separately rather than as very late arrivals.
Why DL505 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding, fuelling — within the carrier’s control
the inbound aircraft was late, so this flight started late
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for DL505 on MSP → SEA. A single late flight can carry more than one cause, and only delays of fifteen minutes or more are attributed at all.
Other departures on MSP → SEA
Same airports, same journey — and not the same odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| DL889 | Delta Air Lines | 90.7% | 14 min early | 767 |
| DL868 | Delta Air Lines | 90.1% | 9 min early | 754 |
| AS387 | Alaska Airlines | 87.8% | 13 min early | 1,010 |
| DL877 | Delta Air Lines | 80.1% | 6 min early | 688 |
| AS555 | Alaska Airlines | 79.0% | 5 min early | 807 |
| DL881 | Delta Air Lines | 76.4% | 7 min early | 734 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. Schedules change; confirm the departure still operates before booking around this.
Data and methodology
Calculated by FlyerIntel from 405 records of DL505 operating MSP → SEA, 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.
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