Flight Reliability
DL 3605 · Delta Air Lines
Seattle → PSC (SEA–PSC)98% of its flights flew this route. The rest (PSC–SEA) are included in these numbers.
95
Nerd Approved
WanderNerd Reliability Score
- 89%
- Arrive within 15 minutes
- 3 min early
- Average arrival delay
- 0%
- Cancelled
- 11 min early
- Median arrival delay
Based on 191 historical flights. Data through May 2026.
What the data says
Skip Thursday if you can.
DL 3605 arrived on time 96% of the time on Tuesdays. On Thursdays: 82%.
A bit ahead of the SEA–PSC route.
DL 3605 arrived on time 89% of the time, versus 84% across the SEA–PSC route.
Better than the Delta Air Lines network average.
DL 3605 arrived on time 89% of the time, versus 81% across the Delta Air Lines network.
It basically never cancels.
Out of 191 scheduled flights, only 0.0% were cancelled.
The breakdown
- Mon89%(28 flights)
- Tue96%(27 flights)
- Wed93%(28 flights)
- Thu82%(27 flights)
- Fri84%(25 flights)
- Sat89%(28 flights)
- Sun89%(27 flights)
84%
Dec
Jun 78% → Dec 84% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 78% | 23 |
| July 2025 | 86% | 29 |
| August 2025 | 94% | 31 |
| September 2025 | 100% | 31 |
| October 2025 | 83% | 30 |
| November 2025 | 93% | 27 |
| December 2025 | 84% | 19 |
- Departures on time
- 91%
- Diverted
- 0.5%
- Flights flown
- 190
- Months covered
- 7
Same route, other flights
Keep nerding
Based on 191 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.