Flight Reliability
DL 479 · Delta Air Lines
Boston → Los Angeles (BOS–LAX)
82
Pretty Reliable
WanderNerd Reliability Score
- 81%
- Arrive within 15 minutes
- 6 min
- Average arrival delay
- 1.9%
- Cancelled
- 5 min early
- Median arrival delay
Based on 363 historical flights. Data through May 2026.
What the data says
Wednesdays have been rough.
DL 479 arrived on time 91% of the time on Sundays and just 73% on Wednesdays. That gap is worth planning around.
A bit ahead of the BOS–LAX route.
DL 479 arrived on time 81% of the time, versus 77% across the BOS–LAX route.
Trending in the right direction.
DL 479 arrived on time 83% of the time over the last three months in the data, compared with 65% in the three months before that.
The breakdown
- Mon75%(48 flights)
- Tue90%(50 flights)
- Wed73%(52 flights)
- Thu83%(52 flights)
- Fri77%(52 flights)
- Sat80%(49 flights)
- Sun91%(53 flights)
- 6–9 AM81%(354 flights)
- 9 AM–12 PM—(2 flights)
87%
May
Jun 87% → May 87% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 87% | 30 |
| July 2025 | 87% | 31 |
| August 2025 | 94% | 31 |
| September 2025 | 93% | 30 |
| October 2025 | 77% | 30 |
| November 2025 | 90% | 29 |
| December 2025 | 71% | 31 |
| January 2026 | 62% | 29 |
| February 2026 | 62% | 26 |
| March 2026 | 87% | 31 |
| April 2026 | 74% | 27 |
| May 2026 | 87% | 31 |
- Departures on time
- 85%
- Diverted
- 0%
- Flights flown
- 356
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 363 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.