Flight number record
UA 1604
United Airlines · Denver to Reno
- Route
- DEN → RNO
- Departs
- 16:10
- Flights
- 362
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 1604, check with United Airlines.
UA 1604 lands a B+, 6 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That rests on 362 flights, with a median arrival 7 minutes early.
Set against the rest of the country, UA 1604's record is 6 points better than the US average of 77.3%. That gap is worth roughly 58 fewer late arrivals for every thousand flights.
Key figures
On time
83.1%
Arrivals under 15 minutes late, of 361 completed flights
Avg delay
75 min
Across delayed arrivals only, not all flights
Cancelled
0.28%
National rate is 1.89%
1 hour+ late
6.4%
National rate is 8.3%
These figures cover 362 flights between September 2025 and August 2026. The median arrival is 7 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 1604 flies
UA 1604 flies DEN to RNO without a single fixed slot. Its most common scheduled departure was 16:10, used on 133 of 362 flights, with 15:55 (71 flights) and 16:05 (52 flights) next.
- Departs 16:10133 flights36.7%
- Departs 15:5571 flights19.6%
- Departs 16:0552 flights14.4%
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 16:10 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and UA 1604 runs 11 points better at 83.1%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
UA 1604 next to DEN to RNO
Every carrier on DEN to RNO combined arrived on time 74.5% of the time across 2,439 flights, so UA 1604 is 9 points ahead of it. United flew 1,292 flights on the same city pair under all its flight numbers, including this one, and those ran 77.2% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 4 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1604thin sample | 362 | 83.1% | 75 min | 0.28% | B+ |
| All United Airlines on DEN–RNO | 1,292 | 77.2% | 66 min | 0.15% | B+ |
| All carriers on DEN–RNO | 2,439 | 74.5% | 60 min | 0.33% | C+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 1604 quarter by quarter
UA 1604 did not run the same all year. Its best quarter was Oct–Dec 2025 at 92.2% on time and its weakest Jul–Sep 2026 at 66.1%, a swing of 26 points on roughly 72 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 flights86.7%
- Oct–Dec 202590 flights92.2%
- Jan–Mar 202689 flights87.5%
- Apr–Jun 202691 flights80.2%
- Jul–Sep 202662 flights66.1%
Scale runs 60% to 100%.
By weekday, UA 1604 did best on Tuesday at 90.2% on time and worst on Sunday at 75.0%. Each day rests on about 52 flights, so a gap of 15 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 1604 runs when it is late
UA 1604 often beats the schedule: 106 of 361 completed flights, 29%, arrived 15 minutes or more early. The 61 late arrivals split 25 under half an hour, 13 between 30 and 60 minutes, and 23 an hour or more.
- 15+ min early106 flights29.4%
- Within 15 min194 flights53.7%
- 15–29 min late25 flights6.9%
- 30–59 min late13 flights3.6%
- 1–2 hours late10 flights2.8%
- 2+ hours late13 flights3.6%
Scale runs 0% to 100%.
Share of 361 completed flights by arrival against schedule.
7 of 52 late departures made up the time and arrived on time, 13% of them. 16 flights left on time and still arrived late.
The worst days
Worst days for UA 1604
The latest arrival of the period was on 17 February 2026, 5 hours behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 17 February 2026 | 5 hours | Late-arriving aircraft |
| 15 March 2026 | 4 hours 51 minutes | Late-arriving aircraft |
| 15 August 2026 | 4 hours 3 minutes | Late-arriving aircraft |
| 14 July 2026 | 3 hours 57 minutes | Late-arriving aircraft |
| 25 February 2026 | 3 hours 50 minutes | Late-arriving aircraft |
Delay causes
Why UA 1604 runs late
Late-arriving aircraft accounts for 59% of the 4,578 delay minutes carriers reported here, and the remaining four split what is left.
- 59%Late-arriving aircraft
- 24%Carrier
- 14%National Airspace System
- 2%Extreme weather
59% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 4,578 reported delay minutes here, that single category outweighs weather by 28 to one. The split is drawn from 4,578 delay minutes reported on UA 1604.
Cancellations are rare at 0.28%, 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
6.4% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over an hour, which a normal layover absorbs.
The 804 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The same number turns up on five other city pairs in the data, including SFO to DEN (158), SNA to SFO (82) and RDU to SFO (53), but none flew often enough under UA 1604 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to RNO only.
One caution: this is a thin sample. 362 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 1604
For a booking, read UA 1604 as 83.1% on time with 0.28% cancelled over 362 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- DEN to RNO, every carrier and departure
- RNO to DEN, the return direction
- United Airlines 2167 on the same route84.8%
- United Airlines 719 on the same route66.7%
- 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
- 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.