Flight number record
UA 757
United Airlines · Seattle to Denver
- Route
- SEA → DEN
- Departs
- 15:48
- Flights
- 365
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s UA 757, check with United Airlines.
UA 757 earns an A+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 8 points better than the national rate of 77.6%. When something does go wrong the average delay runs about an hour. That rests on 365 flights, with a median arrival 8 minutes early.
Set against the rest of the country, UA 757's record is 8 points better than the US average of 77.6%. That gap is worth roughly 79 fewer late arrivals for every thousand flights.
Key figures
On time
85.5%
Arrivals under 15 minutes late, of 359 completed flights
Avg delay
56 min
Across delayed arrivals only, not all flights
Cancelled
0.82%
National rate is 1.81%
1 hour+ late
3.3%
National rate is 8.1%
These figures cover 365 flights between July 2025 and June 2026. The median arrival is 8 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.
Schedule
When UA 757 flies
UA 757 flies SEA to DEN without a single fixed slot. Its most common scheduled departure was 15:48, used on 68 of 365 flights, with 15:40 (51 flights) and 12:55 (45 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 15:4868 flights18.6%
- Departs 15:4051 flights14.0%
- Departs 12:5545 flights12.3%
Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 15:48 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and UA 757 runs 13 points better at 85.5%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Against the route
UA 757 next to SEA to DEN
Every carrier on SEA to DEN combined arrived on time 77.8% of the time across 6,317 flights, so UA 757 is 8 points ahead of it. United flew 1,905 flights on the same city pair under all its flight numbers, including this one, and those ran 87.5% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 7 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 757 | 365 | 85.5% | 56 min | 0.82% | A+ |
| All United Airlines on SEA–DEN | 1,905 | 87.5% | 73 min | 0.84% | A+ |
| All carriers on SEA–DEN | 6,317 | 77.8% | 58 min | 0.85% | B+ |
| United Airlines, whole network | 821,041 | 79.0% | 72 min | 1.01% | B |
Across the year
UA 757 quarter by quarter
UA 757 did not run the same all year. Its best quarter was Oct–Dec 2025 at 93.3% on time and its weakest Jul–Sep 2025 at 75.3%, a swing of 18 points on roughly 91 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 202592 flights75.3%
- Oct–Dec 202592 flights93.3%
- Jan–Mar 202690 flights88.8%
- Apr–Jun 202691 flights84.6%
Scale runs 65% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, UA 757 did best on Saturday at 96.0% on time and worst on Thursday at 77.6%. Each day rests on about 52 flights, so a gap of 18 points is worth noticing but could still narrow in another year.
Delay causes
Why UA 757 runs late
One category carries most of the weight here. National Airspace System accounts for 43% of the 2,915 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 43%National Airspace System
- 43%Late-arriving aircraft
- 12%Carrier
- 1%Extreme weather
- 1%Security
43% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 2,915 reported delay minutes here, that single category outweighs weather by 39 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 2,915 delay minutes reported on UA 757.
Cancellations are rare at 0.82%, below the national 1.81% 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 8.1% 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.
The 1,024 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
The same number turns up on four other city pairs in the data, including SFO to SEA (29), DEN to SAT (23) and DEN to LAS (18), but none flew often enough under UA 757 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SEA to DEN only.
One caution: this is a thin sample. 365 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 757
For a booking, UA 757 has one of the better records a US domestic flight can show: 85.5% on time and 0.82% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- SEA to DEN, every carrier and departure
- DEN to SEA, the return direction
- Alaska Airlines 682 on the same route83.8%
- United Airlines 1505 on the same route91.0%
- Frontier Airlines 3406 on the same route75.6%
- Alaska Airlines 602 on the same route72.7%
- Seattle-Tacoma International (SEA) 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
- 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.