Flight number record
UA 2664
United Airlines · San Francisco to Baltimore
- Route
- SFO → BWI
- Departs
- 09:09
- Flights
- 346
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 2664, check with United Airlines.
UA 2664 earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 15 points better than the national rate of 77.3%. When something does go wrong the average delay runs roughly 50 minutes. That rests on 346 flights, with a median arrival 11 minutes early.
Set against the rest of the country, UA 2664's record is 15 points better than the US average of 77.3%. That gap is worth roughly 145 fewer late arrivals for every thousand flights.
Key figures
On time
91.8%
Arrivals under 15 minutes late, of 343 completed flights
Avg delay
48 min
Across delayed arrivals only, not all flights
Cancelled
0.29%
National rate is 1.89%
1 hour+ late
2.6%
National rate is 8.3%
These figures cover 346 flights between September 2025 and August 2026. The median arrival is 11 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Schedule
When UA 2664 flies
UA 2664 flies SFO to BWI without a single fixed slot. Its most common scheduled departure was 09:09, used on 81 of 346 flights, with 09:33 (74 flights) and 09:10 (71 flights) next.
- Departs 09:0981 flights23.4%
- Departs 09:3374 flights21.4%
- Departs 09:1071 flights20.5%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 09:09 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and UA 2664 runs 8 points better at 91.8%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
UA 2664 next to SFO to BWI
Every carrier on SFO to BWI combined arrived on time 81.0% of the time across 1,034 flights, so UA 2664 is 11 points ahead of it. United flew 669 flights on the same city pair under all its flight numbers, including this one, and those ran 90.8% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 13 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2664thin sample | 346 | 91.8% | 48 min | 0.29% | A+ |
| All United Airlines on SFO–BWI | 669 | 90.8% | 46 min | 0.45% | A+ |
| All carriers on SFO–BWI | 1,034 | 81.0% | 49 min | 0.58% | B+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 2664 quarter by quarter
Quarter by quarter UA 2664 held fairly steady: 94.9% in Oct–Dec 2025, 92.8% in Jan–Mar 2026, 95.6% in Apr–Jun 2026 and 87.1% in Jul–Sep 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights—
- Oct–Dec 202578 flights94.9%
- Jan–Mar 202685 flights92.8%
- Apr–Jun 202691 flights95.6%
- Jul–Sep 202662 flights87.1%
Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, UA 2664 ranged from 89.6% on Sunday to 93.9% on Monday. With about 49 flights behind each day, a spread of 4 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late UA 2664 runs when it is late
UA 2664 often beats the schedule: 145 of 343 completed flights, 42%, arrived 15 minutes or more early. The 28 late arrivals split 9 under half an hour, 10 between 30 and 60 minutes, and 9 an hour or more.
- 15+ min early145 flights42.3%
- Within 15 min170 flights49.6%
- 15–29 min late9 flights2.6%
- 30–59 min late10 flights2.9%
- 1–2 hours late8 flights2.3%
- 2+ hours late1 flights0.3%
Scale runs 0% to 100%.
Share of 343 completed flights by arrival against schedule.
A late pushback is often recovered here: of 39 departures that left 15 minutes late or more, 18 still arrived on time. 7 flights left on time and still arrived late.
The worst days
Worst days for UA 2664
The latest arrival of the period was on 18 October 2025, 2 hours 11 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 18 October 2025 | 2 hours 11 minutes | Late-arriving aircraft |
| 12 August 2026 | 1 hour 33 minutes | Carrier |
| 12 June 2026 | 1 hour 32 minutes | Late-arriving aircraft |
| 18 September 2025 | 1 hour 29 minutes | Late-arriving aircraft |
| 16 January 2026 | 1 hour 27 minutes | Carrier |
Delay causes
Why UA 2664 runs late
Late-arriving aircraft accounts for 46% of the 1,350 delay minutes carriers reported here, and the remaining four split what is left.
- 46%Late-arriving aircraft
- 35%Carrier
- 19%National Airspace System
46% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 1,350 reported delay minutes here, that single category outweighs weather by 46 to one. The split is drawn from 1,350 delay minutes reported on UA 2664.
Cancellations are rare at 0.29%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 2.6% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
At 2,457 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
The same number turns up on two other city pairs in the data, including DTW to SFO (20) and FLL to DEN (19), but none flew often enough under UA 2664 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SFO to BWI only.
One caution: this is a thin sample. 346 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking UA 2664
For a booking, UA 2664 has one of the better records a US domestic flight can show: 91.8% on time and 0.29% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- SFO to BWI, every carrier and departure
- BWI to SFO, the return direction
- San Francisco International (SFO) delay statistics
- Baltimore/Washington International Thurgood Marshall (BWI) delay statistics
- United Airlines on-time record
- Every United Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
A flight number here means United Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.