Flight Reliability
DL 542 · Delta Air Lines
Seattle → Atlanta (SEA–ATL)
81
Pretty Reliable
WanderNerd Reliability Score
- 79%
- Arrive within 15 minutes
- 7 min
- Average arrival delay
- 0.9%
- Cancelled
- 5 min early
- Median arrival delay
Based on 350 historical flights. Data through May 2026.
What the data says
Friday is doing you no favors.
DL 542 arrived on time 87% of the time on Thursdays and just 68% on Fridays. That gap is worth planning around.
Ticking up lately.
DL 542 arrived on time 81% of the time over the last three months in the data, compared with 74% in the three months before that.
The breakdown
- Mon78%(51 flights)
- Tue85%(47 flights)
- Wed85%(47 flights)
- Thu87%(52 flights)
- Fri68%(50 flights)
- Sat80%(45 flights)
- Sun74%(53 flights)
- 9 AM–12 PM78%(60 flights)
- 12–3 PM80%(264 flights)
- 9 PM–12 AM81%(21 flights)
74%
May
Jun 71% → May 74% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 71% | 28 |
| July 2025 | 97% | 31 |
| August 2025 | 81% | 31 |
| September 2025 | 80% | 30 |
| October 2025 | 77% | 31 |
| November 2025 | 83% | 30 |
| December 2025 | 70% | 30 |
| January 2026 | 74% | 31 |
| February 2026 | 79% | 28 |
| March 2026 | 90% | 19 |
| April 2026 | 80% | 25 |
| May 2026 | 74% | 31 |
- Departures on time
- 78%
- Diverted
- 0.6%
- Flights flown
- 345
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 350 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.