Flight Reliability
DL 2138 · Delta Air Lines
Atlanta → Portland (ATL–PWM)85% of its flights flew this route. The rest (ORD–MSP, ATL–MSY) are included in these numbers.
- 68%
- Arrive within 15 minutes
- 19 min
- Average arrival delay
- 1.6%
- Cancelled
- 1 min
- Median arrival delay
Based on 252 historical flights. Data through May 2026.
What the data says
The late departure is the smart one here.
DL 2138 departing between 6–9 PM arrived on time 74% of the time, versus 63% between 9 PM–12 AM.
Sunday scaries are real for this one.
DL 2138 arrived on time 80% of the time on Tuesdays and just 51% on Sundays. That gap is worth planning around.
Lagging the ATL–PWM route.
DL 2138 arrived on time 68% of the time, versus 76% across the ATL–PWM route.
Lagging the Delta Air Lines network.
DL 2138 arrived on time 68% of the time, versus 81% across the Delta Air Lines network.
The breakdown
- Mon78%(37 flights)
- Tue80%(35 flights)
- Wed66%(35 flights)
- Thu66%(38 flights)
- Fri63%(35 flights)
- Sat74%(31 flights)
- Sun51%(37 flights)
- 6–9 PM74%(122 flights)
- 9 PM–12 AM63%(126 flights)
Jun 39% → May 75% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 39% | 28 |
| July 2025 | 52% | 29 |
| August 2025 | 77% | 31 |
| September 2025 | 83% | 30 |
| October 2025 | 90% | 30 |
| November 2025 | 71% | 28 |
| December 2025 | 55% | 31 |
| February 2026 | 62% | 13 |
| May 2026 | 75% | 20 |
- Departures on time
- 66%
- Diverted
- 0%
- Flights flown
- 248
- Months covered
- 11
Same route, other flights
Keep nerding
Based on 252 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.