Flight Reliability
DL 474 · Delta Air Lines
Seattle → Boston (SEA–BOS)91% of its flights flew this route. The rest (CID–ATL, CVG–ATL) are included in these numbers.
73
Usually Fine
WanderNerd Reliability Score
- 77%
- Arrive within 15 minutes
- 16 min
- Average arrival delay
- 1.2%
- Cancelled
- 4 min early
- Median arrival delay
Based on 247 historical flights. Data through May 2026.
What the data says
Sunday scaries are real for this one.
DL 474 arrived on time 100% of the time on Saturdays and just 62% on Sundays. That gap is worth planning around.
A bit behind the Delta Air Lines network.
DL 474 arrived on time 77% of the time, versus 81% across the Delta Air Lines network.
Trending in the right direction.
DL 474 arrived on time 82% of the time over the last three months in the data, compared with 70% in the three months before that.
The breakdown
- Mon75%(40 flights)
- Tue92%(36 flights)
- Wed80%(35 flights)
- Thu70%(40 flights)
- Fri80%(39 flights)
- Sat100%(12 flights)
- Sun62%(39 flights)
- 3–6 AM79%(14 flights)
- 3–6 PM77%(226 flights)
- 6–9 PM—(1 flights)
96%
May
Jun 96% → May 96% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 96% | 26 |
| July 2025 | 79% | 29 |
| August 2025 | 75% | 24 |
| September 2025 | 59% | 17 |
| October 2025 | 64% | 25 |
| November 2025 | 64% | 22 |
| December 2025 | 81% | 21 |
| March 2026 | 76% | 21 |
| April 2026 | 73% | 26 |
| May 2026 | 96% | 25 |
- Departures on time
- 73%
- Diverted
- 1.2%
- Flights flown
- 241
- Months covered
- 11
Same route, other flights
Keep nerding
Based on 247 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.