Flight Reliability
DL 378 · Delta Air Lines
Atlanta → Washington (ATL–DCA)100% of its flights flew this route. The rest (ATL–CHA) are included in these numbers.
- 62%
- Arrive within 15 minutes
- 25 min
- Average arrival delay
- 3.0%
- Cancelled
- 4 min
- Median arrival delay
Based on 263 historical flights. Data through May 2026.
What the data says
Thursdays have been rough.
DL 378 arrived on time 76% of the time on Mondays and just 48% on Thursdays. That gap is worth planning around.
Lagging the ATL–DCA route.
DL 378 arrived on time 62% of the time, versus 70% across the ATL–DCA route.
Well behind the Delta Air Lines network.
DL 378 arrived on time 62% of the time, versus 81% across the Delta Air Lines network.
Keep a backup plan handy.
DL 378 was cancelled 3.0% of the time. Typical for U.S. flights is around 1–2%.
The breakdown
- Mon76%(49 flights)
- Tue—(1 flights)
- Wed65%(49 flights)
- Thu48%(48 flights)
- Fri60%(45 flights)
- Sat73%(15 flights)
- Sun57%(47 flights)
Jun 48% → May 55% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 48% | 25 |
| July 2025 | 27% | 22 |
| August 2025 | 59% | 27 |
| September 2025 | 91% | 22 |
| October 2025 | 82% | 22 |
| November 2025 | 75% | 20 |
| December 2025 | 75% | 12 |
| January 2026 | 65% | 20 |
| February 2026 | 47% | 19 |
| March 2026 | 50% | 22 |
| April 2026 | 81% | 21 |
| May 2026 | 55% | 22 |
- Departures on time
- 68%
- Diverted
- 0.4%
- Flights flown
- 254
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 263 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.