Flight number record
UA 662
United Airlines · Boston to Denver
- Route
- BOS → DEN
- Departs
- 09:40
- Flights
- 275
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 662, check with United Airlines.
UA 662 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 12 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 275 flights, with a median arrival 15 minutes early.
Set against the rest of the country, UA 662's record is 12 points better than the US average of 77.3%. That gap is worth roughly 120 fewer late arrivals for every thousand flights.
Key figures
On time
89.3%
Arrivals under 15 minutes late, of 272 completed flights
Avg delay
64 min
Across delayed arrivals only, not all flights
Cancelled
0.73%
National rate is 1.89%
1 hour+ late
3.3%
National rate is 8.3%
These figures cover 275 flights between September 2025 and August 2026. The median arrival is 15 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 662 flies
UA 662 flies BOS to DEN without a single fixed slot. Its most common scheduled departure was 09:40, used on 82 of 275 flights, with 09:30 (66 flights) and 09:15 (54 flights) next.
- Departs 09:4082 flights29.8%
- Departs 09:3066 flights24.0%
- Departs 09:1554 flights19.6%
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 09:40 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and UA 662 runs 5 points better at 89.3%. 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 662 next to BOS to DEN
Every carrier on BOS to DEN combined arrived on time 75.7% of the time across 3,847 flights, so UA 662 is 14 points ahead of it. United flew 1,884 flights on the same city pair under all its flight numbers, including this one, and those ran 82.5% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 11 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 662thin sample | 275 | 89.3% | 64 min | 0.73% | A+ |
| All United Airlines on BOS–DEN | 1,884 | 82.5% | 70 min | 1.11% | B |
| All carriers on BOS–DEN | 3,847 | 75.7% | 62 min | 1.38% | B |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 662 quarter by quarter
UA 662 did not run the same all year. Its best quarter was Apr–Jun 2026 at 95.3% on time and its weakest Jul–Sep 2026 at 76.3%, a swing of 19 points on roughly 55 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202530 flights90.0%
- Oct–Dec 202561 flights90.2%
- Jan–Mar 202639 flights94.6%
- Apr–Jun 202686 flights95.3%
- Jul–Sep 202659 flights76.3%
Scale runs 70% to 100%.
By weekday, UA 662 did best on Wednesday at 94.3% on time and worst on Tuesday at 81.6%. Each day rests on about 39 flights, so a gap of 13 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 662 runs when it is late
UA 662 often beats the schedule: 138 of 272 completed flights, 51%, arrived 15 minutes or more early. The 29 late arrivals split 13 under half an hour, 7 between 30 and 60 minutes, and 9 an hour or more.
- 15+ min early138 flights50.7%
- Within 15 min105 flights38.6%
- 15–29 min late13 flights4.8%
- 30–59 min late7 flights2.6%
- 1–2 hours late6 flights2.2%
- 2+ hours late3 flights1.1%
Scale runs 0% to 100%.
Share of 272 completed flights by arrival against schedule.
6 of 24 late departures made up the time and arrived on time, 25% of them. 11 flights left on time and still arrived late.
The worst days
Worst days for UA 662
The latest arrival of the period was on 8 May 2026, 5 hours 50 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 8 May 2026 | 5 hours 50 minutes | Carrier |
| 28 April 2026 | 4 hours 2 minutes | Carrier |
| 17 February 2026 | 2 hours 17 minutes | National Airspace System |
| 11 July 2026 | 1 hour 58 minutes | Carrier |
| 6 November 2025 | 1 hour 54 minutes | Late-arriving aircraft |
Delay causes
Why UA 662 runs late
Carrier accounts for 63% of the 1,847 delay minutes carriers reported here, and the remaining four split what is left.
- 63%Carrier
- 27%National Airspace System
- 8%Late-arriving aircraft
- 2%Extreme weather
The largest share of delay minutes, 63%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,161 of the 1,847 delay minutes reported here. The split is drawn from 1,847 delay minutes reported on UA 662.
Cancellations are rare at 0.73%, 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 3.3% 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 1,754 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 fourteen other city pairs in the data, including DEN to SMF (102), SFO to RNO (16) and RNO to DEN (16), but none flew often enough under UA 662 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to BOS to DEN only.
One caution: this is a thin sample. 275 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 662
For a booking, UA 662 has one of the better records a US domestic flight can show: 89.3% on time and 0.73% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- BOS to DEN, every carrier and departure
- DEN to BOS, the return direction
- Delta Air Lines 499 on the same route83.6%
- United Airlines 414 on the same route89.4%
- United Airlines 647 on the same route90.5%
- United Airlines 2297 on the same route85.1%
- United Airlines 800 on the same route72.9%
- JetBlue Airways 993 on the same route57.2%
- Boston Logan International (BOS) delay statistics
- Denver International (DEN) 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
- How to read this site: grades, sample sizes, and honest caveats
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.