Flight profile · Delta Air Lines
DL1655
Boston (BOS) to San Francisco (SFO) · scheduled 5:00 PM – 8:50 PM
How DL1655 performs
414 operations, 2025-04-14 to 2026-06-30.
DL1655 arrived on time 67.6% of the time, against 75.0% for all BOS → SFO flights — this specific departure is 7.3 percentage points worse than the route as a whole. Against Delta Air Lines’s own flights on this route it is 6.1 points worse.
Source: US DOT Bureau of Transportation Statistics · 414 operations between 2025-04-14 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| DL1655 | 67.6% | 1.21% | -2 min | 8.3% | 414 |
| Delta Air Lines on BOS → SFO | 73.7% | 0.91% | -6 min | 7.8% | 2,425 |
| All BOS → SFO flights | 75.0% | 0.96% | -6 min | 8.6% | 13,723 |
Source: FlyerIntel analysis of US DOT BTS data · 2025-04-14 to 2026-06-30
Other routes DL1655 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| SFO→BOS San Francisco to Boston | 2025-05-08 – 2026-06-27 | 213 | 68.7% |
| GEG→SLC Spokane to Salt Lake City | 2024-12-22 – 2025-01-05 | 3 | — |
| SLC→GEG Salt Lake City to Spokane | 2024-12-22 – 2025-01-05 | 3 | — |
| BOS→LGA Boston to New York | 2024-12-24 – 2025-01-01 | 4 | — |
| CVG→DTW Cincinnati / Covington to Detroit | 2024-12-20 – 2024-12-20 | 1 | — |
| SLC→LGB Salt Lake City to Long Beach | 2024-12-06 – 2024-12-17 | 12 | — |
| BNA→MSP Nashville to Minneapolis | 2024-11-11 – 2024-12-02 | 20 | — |
| ATL→ABQ Atlanta to Albuquerque | 2024-10-03 – 2024-10-14 | 9 | — |
| SLC→DFW Salt Lake City to Dallas–Fort Worth | 2024-10-07 – 2024-10-07 | 1 | — |
| BNA→LGA Nashville to New York | 2024-09-16 – 2024-09-16 | 1 | — |
| LGA→BNA New York to Nashville | 2024-09-16 – 2024-09-16 | 1 | — |
| ATL→ECP Atlanta to Panama City Beach | 2024-07-08 – 2024-09-08 | 53 | — |
| ORD→BOS Chicago to Boston | 2024-06-09 – 2024-07-07 | 5 | — |
| ATL→TUL Atlanta to Tulsa | 2024-05-07 – 2024-06-06 | 31 | — |
| TUL→ATL Tulsa to Atlanta | 2024-05-07 – 2024-06-06 | 26 | — |
| LGA→FLL New York to Fort Lauderdale | 2024-04-09 – 2024-05-06 | 28 | — |
| ATL→BHM Atlanta to Birmingham | 2024-03-10 – 2024-04-08 | 18 | — |
| ATL→SAT Atlanta to San Antonio | 2024-03-12 – 2024-03-30 | 9 | — |
| ATL→JAN Atlanta to Jackson | 2024-01-08 – 2024-03-08 | 50 | — |
| JAN→ATL Jackson to Atlanta | 2024-01-08 – 2024-03-08 | 50 | — |
| MSP→DEN Minneapolis to Denver | 2023-12-25 – 2024-01-07 | 5 | — |
| PHL→DTW Philadelphia to Detroit | 2023-07-09 – 2024-01-03 | 82 | — |
| DTW→PVD Detroit to Providence/Warwick | 2023-12-07 – 2023-12-15 | 9 | — |
| JFK→ATL New York to Atlanta | 2023-12-04 – 2023-12-06 | 3 | — |
| IAH→MSP Houston to Minneapolis | 2023-11-11 – 2023-12-02 | 3 | — |
| ATL→SAV Atlanta to Savannah | 2023-11-06 – 2023-11-27 | 13 | — |
| SAV→ATL Savannah to Atlanta | 2023-11-06 – 2023-11-27 | 12 | — |
| DTW→PHL Detroit to Philadelphia | 2023-07-09 – 2023-10-27 | 74 | — |
Because the same number has served different journeys, the statistics above describe only the route DL1655 currently operates. Blending them would produce an average of two different flights.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
51 min late
against a median of 2 min early
Percentiles over 414 operations. Cancelled and diverted flights have no arrival time and are counted separately rather than as very late arrivals.
Why DL1655 runs late
Where US DOT attributed the delay minutes on this flight.
airspace and airport capacity, including weather-driven flow control
crew, maintenance, boarding, fuelling — within the carrier’s control
the inbound aircraft was late, so this flight started late
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for DL1655 on BOS → SFO. A single late flight can carry more than one cause, and only delays of fifteen minutes or more are attributed at all.
Other departures on BOS → SFO
Same airports, same journey — and not the same odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| UA1008 | United Airlines | 88.0% | 12 min early | 954 |
| UA1187 | United Airlines | 81.0% | 12 min early | 604 |
| DL977 | Delta Air Lines | 80.8% | 8 min early | 862 |
| B61833 | JetBlue | 80.2% | 13 min early | 681 |
| B6133 | JetBlue | 80.2% | 9 min early | 660 |
| B6733 | JetBlue | 69.4% | 3 min early | 763 |
| AS357 | Alaska Airlines | 68.6% | 2 min early | 636 |
| DL475 | Delta Air Lines | 68.4% | 3 min early | 744 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. Schedules change; confirm the departure still operates before booking around this.
Data and methodology
Calculated by FlyerIntel from 414 records of DL1655 operating BOS → SFO, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.
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