Flight OddsDL977 BOS → SFO
Delta Air Lines · Boston, MA to San Francisco, CA · 172 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 BOS → SFO, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
82%
Median delay
-1 min
90th percentile
+31 min
Cancellation rate
3%
How often is DL977 on time?
Across 172 flights on BOS → SFO from 2025-12-21 to 2026-06-30, DL977 arrived within 15 minutes of schedule 82% of the time. The median arrival delay was -1 min, and the worst 10% of flights arrived +31 min or later. 3% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 137 | 82% |
| 16-30 min | 13 | 8% |
| 31-60 min | 10 | 6% |
| 61-120 min | 6 | 4% |
| 2+ hrs | 1 | 1% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-12 | 10 | 60% | +14 min |
| 2026-01 | 22 | 73% | +9 min |
| 2026-02 | 20 | 85% | -8 min |
| 2026-03 | 27 | 89% | -6 min |
| 2026-04 | 27 | 89% | +3 min |
| 2026-05 | 31 | 87% | -4 min |
| 2026-06 | 30 | 77% | +8 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 26 | 81% |
| Tue | 27 | 78% |
| Wed | 27 | 85% |
| Thu | 27 | 93% |
| Fri | 27 | 74% |
| Sat | 11 | 64% |
| Sun | 22 | 91% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…