Flight number record
UA 757
United Airlines · Seattle to Denver
- Route
- SEA → DEN
- Departs
- 15:48
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 77.3%. When something does go wrong the average delay runs about an hour. That rests on 365 flights, with a median arrival 9 minutes early.
Set against the rest of the country, UA 757's record is 8 points better than the US average of 77.3%. That gap is worth roughly 81 fewer late arrivals for every thousand flights.
Key figures
On time
85.4%
Arrivals under 15 minutes late, of 362 completed flights
Avg delay
61 min
Across delayed arrivals only, not all flights
Cancelled
0.82%
National rate is 1.89%
1 hour+ late
4.1%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. The median arrival is 9 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 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 11:02 (47 flights) next.
- Departs 15:4868 flights18.6%
- Departs 15:4051 flights14.0%
- Departs 11:0247 flights12.9%
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 15:48 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and UA 757 runs 14 points better at 85.4%. 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 757 next to SEA to DEN
Every carrier on SEA to DEN combined arrived on time 78.3% of the time across 6,333 flights, so UA 757 is 7 points ahead of it. United flew 1,910 flights on the same city pair under all its flight numbers, including this one, and those ran 88.2% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 7 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 757 | 365 | 85.4% | 61 min | 0.82% | A+ |
| All United Airlines on SEA–DEN | 1,910 | 88.2% | 74 min | 0.58% | A+ |
| All carriers on SEA–DEN | 6,333 | 78.3% | 58 min | 0.68% | B+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | 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 2026 at 74.2%, a swing of 19 points on roughly 73 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 flights76.7%
- Oct–Dec 202592 flights93.3%
- Jan–Mar 202690 flights88.8%
- Apr–Jun 202691 flights84.6%
- Jul–Sep 202662 flights74.2%
Scale runs 65% to 100%.
By weekday, UA 757 did best on Saturday at 96.1% on time and worst on Thursday at 76.5%. Each day rests on about 52 flights, so a gap of 20 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 757 runs when it is late
UA 757 often beats the schedule: 122 of 362 completed flights, 34%, arrived 15 minutes or more early. The 53 late arrivals split 22 under half an hour, 16 between 30 and 60 minutes, and 15 an hour or more.
- 15+ min early122 flights33.7%
- Within 15 min187 flights51.7%
- 15–29 min late22 flights6.1%
- 30–59 min late16 flights4.4%
- 1–2 hours late7 flights1.9%
- 2+ hours late8 flights2.2%
Scale runs 0% to 100%.
Share of 362 completed flights by arrival against schedule.
10 of 46 late departures made up the time and arrived on time, 22% of them. 17 flights left on time and still arrived late.
The worst days
Worst days for UA 757
The latest arrival of the period was on 16 March 2026, 5 hours 24 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across March, February and August, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 16 March 2026 | 5 hours 24 minutes | Late-arriving aircraft |
| 1 February 2026 | 2 hours 56 minutes | Carrier |
| 13 March 2026 | 2 hours 47 minutes | Late-arriving aircraft |
| 13 August 2026 | 2 hours 43 minutes | National Airspace System |
| 17 February 2026 | 2 hours 40 minutes | National Airspace System |
Delay causes
Why UA 757 runs late
National Airspace System accounts for 49% of the 3,225 delay minutes carriers reported here, and the remaining four split what is left.
- 49%National Airspace System
- 35%Late-arriving aircraft
- 12%Carrier
- 3%Extreme weather
- 1%Security
35% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 3,225 reported delay minutes here, that single category outweighs weather by 12 to one. The split is drawn from 3,225 delay minutes reported on UA 757.
Cancellations are rare at 0.82%, 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 4.1% 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.
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.
The same number turns up on three other city pairs in the data, including SFO to SEA (29), DEN to SAT (23) and DEN to ORD (6), 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: 85.4% 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
- United Airlines 1505 on the same route91.1%
- Alaska Airlines 602 on the same route74.7%
- Frontier Airlines 3406 on the same route75.0%
- Alaska Airlines 682 on the same route86.1%
- Delta Air Lines 2851 on the same route76.1%
- 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.