Flight OddsDL977 SFO → BOS
Delta Air Lines · San Francisco, CA to Boston, MA · 168 flights observed, 2025-12-21 to 2026-06-30 · 2,704 mi
DL977 covers more than one route in the data window — the stats below are for SFO → BOS, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
62%
Median delay
+4 min
90th percentile
+71 min
Cancellation rate
2%
How often is DL977 on time?
Across 168 flights on SFO → BOS from 2025-12-21 to 2026-06-30, DL977 arrived within 15 minutes of schedule 62% of the time. The median arrival delay was +4 min, and the worst 10% of flights arrived +71 min or later. 2% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 102 | 62% |
| 16-30 min | 21 | 13% |
| 31-60 min | 19 | 12% |
| 61-120 min | 15 | 9% |
| 2+ hrs | 7 | 4% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-12 | 7 | 43% | +19 min |
| 2026-01 | 22 | 73% | +10 min |
| 2026-02 | 20 | 75% | +59 min |
| 2026-03 | 27 | 74% | +5 min |
| 2026-04 | 27 | 44% | +21 min |
| 2026-05 | 31 | 65% | +17 min |
| 2026-06 | 30 | 53% | +37 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 28 | 61% |
| Tue | 27 | 63% |
| Wed | 25 | 60% |
| Thu | 25 | 60% |
| Fri | 27 | 59% |
| Sat | 11 | 55% |
| Sun | 21 | 76% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…