Flight profile · United Airlines
UA2441
Boston (BOS) to San Francisco (SFO) · scheduled 6:00 AM – 9:27 AM
How UA2441 performs
606 operations, July 2024 – August 2026.
Between its first and last recorded date on BOS → SFO, UA2441 averaged about 5 operations a week (606 in 792 days, cancelled ones included).
UA2441 arrived on time 86.7% of the time, against 74.1% for all BOS → SFO flights, so this departure is 12.6 percentage points better than the route as a whole. Against United Airlines’ own flights on this route it is 8.7 points better.
Source: US DOT Bureau of Transportation Statistics · 606 operations, July 2024 – August 2026 · If UA2441 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
What stands out
How UA2441 compares to other flight numbers, not just to itself.
This flight runs unusually far ahead of the BOS → SFO route as a whole, better than 95% of 12,358 comparable flight numbers.
86.7% on time for this specific departure, against 74.1% for every BOS → SFO flight.
Source: FlyerIntel analysis of US DOT BTS data · July 2024 – August 2026 · The one thing about this specific departure that ranks most extreme against every other published flight number, out of everything FlyerIntel checks — shown only when something clears a real statistical bar, not for every flight.
Where UA2441 is right now
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Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| UA2441 | 86.7% | 0.66% | -8 min | 1.7% | 606 |
| United Airlines on BOS → SFO | 78.0% | 1.15% | -7 min | 7.8% | 5,722 |
| All BOS → SFO flights | 74.1% | 1.04% | -6 min | 9.0% | 14,745 |
UA2441 cancelled 4 of 606 operations (0.66%), close to the 1.04% for BOS → SFO.
1.7% of UA2441’s arrivals were an hour or more late, against 9.0% across BOS → SFO, so the long delays are less common on this number than on the route.
Source: FlyerIntel analysis of US DOT BTS data · July 2024 – August 2026
Why UA2441 runs late
Where US DOT attributed the delay minutes on this flight.
airspace and airport capacity, including weather-driven flow control
crew, maintenance, boarding and fueling, all 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 UA2441 on BOS → SFO. Only delays of 15 minutes or more are attributed. What the five causes mean
Source: US DOT Bureau of Transportation Statistics · Data covering July 2024 – August 2026
Does a late aircraft delay this flight?
How often the plane that flies UA2441 comes in late, and what that does to the departure.
UA2441 is usually the aircraft’s first flight of the day: the schedule gives it a median of 7 hours on the ground at BOS, so its “inbound” is mostly the aircraft’s arrival the evening before.
When the aircraft came in 15 or more minutes late, UA2441 pushed back an average of 2 minutes late; when it came in on time or early, an average of 2 minutes early.
Matched by tail number to the aircraft’s previous flight into BOS: 586 of 602 departures. Unknown, cancelled or diverted inbounds and gaps over 12 hours are left out.
Against the network at the same turn length
| Share of departures | Inbound landed 15+ late | Left 15+ late after a late inbound | Left 15+ late after an on-time inbound |
|---|---|---|---|
| UA2441 | 24% | 6% | 6% |
| Network, same turn | 29% | 12% | 9% |
A night on the ground absorbs most of a late arrival, so a late inbound matters far less here than on a same-day turn.
The network row is every flight with a scheduled turn of 6 hours or more, usually overnight. How often UA2441’s aircraft landed 15 or more minutes late is lower than the network’s and, once the aircraft was late, how often UA2441 left 15 or more minutes late is lower than the network’s.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2024 – August 2026
From pushback to gate
When it leaves BOS late, does that still matter by the time it reaches SFO?
UA2441 pushes back an average of 0.3 minutes early and reaches the gate at SFO an average of 4.4 minutes early. The 4.1 minutes between those two figures are slack the published schedule already carries. Its 20.2 minutes on the taxiways at BOS is about what any departure from the airport in that hour spends.
On arrival at SFO, UA2441 spends 8.3 min taxiing from touchdown to the gate — ground time a connecting passenger sits through before they can even leave the aircraft, on top of however late the flight itself ran. That is about what any arrival at SFO spends on the ground before reaching the gate.
Taxi-out is gate to wheels up and sits inside the scheduled block; the hourly comparison is 37,770 BOS departures. Taxi-in is landing to gate, set against 449,639 arrivals at SFO. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · July 2024 – August 2026
The hour it leaves BOS
UA2441 has one departure time, 6:00 AM, so this is what that hour at BOS is worth.
On-time arrival rate. 37,770 departures from BOS are scheduled in the 6 AM–7 AM hour over the period, against 454,081 across the whole day.
UA2441 is scheduled out of BOS at 6:00 AM, in the 6 AM–7 AM bank. Departures from BOS in that hour arrive on time 88.8% of the time against 77.0% across the airport’s whole day — the slot alone is worth 11.8 points better before anything about this particular flight is considered.
Both airport figures cover every destination from BOS, so they describe the slot, not this journey; the route comparison is above. Why the hour matters.
Source: FlyerIntel analysis of US DOT BTS data · July 2024 – August 2026 · Hours below 120 departures are not scored.
Other routes UA2441 has flown
Carriers reassign flight numbers. UA2441 also served these 16 other city pairs in the period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| SFO→SNA San Francisco to Santa Ana | March 29, 2026 – August 31, 2026 | 74 | — |
| SFO→LAX San Francisco to Los Angeles | March 5–28, 2026 | 24 | — |
| MCO→EWR Orlando to Newark | January 6, 2026 – February 11, 2026 | 37 | — |
| SFO→PHX San Francisco to Phoenix | October 26, 2025 – January 5, 2026 | 55 | — |
| PHX→ORD Phoenix to Chicago | October 26, 2025 – December 1, 2025 | 36 | — |
| LAS→IAH Las Vegas to Houston | October 7, 2025 | 1 | — |
| SFO→RDM San Francisco to Redmond | August 19, 2025 – September 1, 2025 | 14 | — |
| SFO→BUR San Francisco to Burbank | August 19, 2024 – August 18, 2025 | 309 | 84.4% |
| SFO→LAS San Francisco to Las Vegas | November 1, 2024 – December 2, 2024 | 32 | — |
| IAH→EWR Houston to Newark | May 23, 2024 – June 26, 2024 | 35 | — |
| EWR→RDU Newark to Raleigh–Durham | May 23, 2024 – June 26, 2024 | 25 | — |
| MFE→IAH McAllen to Houston | May 23, 2024 – June 26, 2024 | 25 | — |
| PSP→DEN Palm Springs to Denver | September 30, 2023 – May 22, 2024 | 236 | 91.1% |
| AUS→ORD Austin to Chicago | September 29, 2023 | 1 | — |
| LAX→CLE Los Angeles to Cleveland | September 5–28, 2023 | 24 | — |
| PDX→IAH Portland to Houston | July 1, 2023 – September 4, 2023 | 65 | — |
The figures above describe only BOS → SFO, the route UA2441 flies now.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
19 min late
against a median of 8 min early
Percentiles over 606 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2024 – August 2026
Other flights on this route
Same airports, same journey, different odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| UA1008 | United Airlines | 88.0% | 12 min early | 954 |
| UA2441 this flight | United Airlines | 86.7% | 8 min early | 606 |
| B61333 | JetBlue | 84.1% | 12 min early | 632 |
| UA1187 | United Airlines | 81.0% | 12 min early | 604 |
| DL977 | Delta Air Lines | 80.6% | 8 min early | 924 |
| B6133 | JetBlue | 80.2% | 10 min early | 660 |
| B61833 | JetBlue | 78.3% | 11 min early | 743 |
| AS357 | Alaska Airlines | 68.6% | 2 min early | 636 |
| DL475 | Delta Air Lines | 68.4% | 3 min early | 744 |
Among the 9 departures listed, UA2441 has the 2nd highest on-time rate, 1.3 points behind the best. Every departure here has at least 600 operations; the other rows are the most punctual on the route, not all of them.
Data and methodology
Calculated by FlyerIntel from 606 records of UA2441 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 reported separately, not in the on-time rate.
Full methodology · Data sources · Report a problem
Related research: Most and Least Reliable Flight Numbers · The Delay You Inherit · Making Up Time in the Air
Analysis last recomputed