Flight number record

UA 1537

United Airlines · Denver to Jackson

Route: DEN → JAC
Departs: 13:45
Flights: 274
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s UA 1537, check with United Airlines.

UA 1537 earns a B+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.6%. When something does go wrong the average delay runs about an hour. That rests on 274 flights, with a median arrival 7 minutes early.

Set against the rest of the country, UA 1537's record is 7 points better than the US average of 77.6%. That gap is worth roughly 73 fewer late arrivals for every thousand flights.

On time

84.9%

Arrivals under 15 minutes late, of 271 completed flights

Avg delay

60 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.81%

1 hour+ late

5.2%

National rate is 8.1%

These figures cover 274 flights between July 2025 and June 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.

Schedule

When UA 1537 flies

UA 1537 flies DEN to JAC without a single fixed slot. Its most common scheduled departure was 13:45, used on 84 of 274 flights, with 13:30 (49 flights) and 13:55 (41 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 13:4584 flights30.7%
Departs 13:3049 flights17.9%
Departs 13:5541 flights15.0%

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 13:45 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and UA 1537 runs 6 points better at 84.9%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

UA 1537 next to DEN to JAC

Every carrier on DEN to JAC combined arrived on time 81.6% of the time across 1,634 flights, so UA 1537 is 3 points ahead of it. United flew 1,134 flights on the same city pair under all its flight numbers, including this one, and those ran 76.9% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 6 points.

UA 1537 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 1537thin sample	274	84.9%	60 min	0.00%	B+
All United Airlines on DEN–JAC	1,134	76.9%	64 min	0.88%	B+
All carriers on DEN–JAC	1,634	81.6%	62 min	1.29%	B
United Airlines, whole network	821,041	79.0%	72 min	1.01%	B

Across the year

UA 1537 quarter by quarter

Quarter by quarter UA 1537 held fairly steady: 89.0% in Jul–Sep 2025, 88.6% in Oct–Dec 2025, 81.9% in Jan–Mar 2026 and 80.6% in Apr–Jun 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights89.0%
Oct–Dec 202537 flights88.6%
Jan–Mar 202683 flights81.9%
Apr–Jun 202662 flights80.6%

Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, UA 1537 did best on Tuesday at 92.5% on time and worst on Saturday at 77.8%. Each day rests on about 39 flights, so a gap of 15 points is worth noticing but could still narrow in another year.

Delay causes

Why UA 1537 runs late

Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 2,451 reported delay minutes.

Late-arriving aircraft
38%
Carrier
29%
National Airspace System
19%
Extreme weather
14%

Extreme weather accounts for 14% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.2 times the usual weather exposure. The split is drawn from 2,451 delay minutes reported on UA 1537.

Cancellations are rare at 0.00%, below the national 1.81% and low enough to earn the plus on the grade. Almost no flights are called off; the risk here is arriving late, not not arriving.

Connections and routes

What a delay on this flight costs

5.2% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.

The same number turns up on seven other city pairs in the data, including IAD to DEN (53), SJC to DEN (37) and XNA to DEN (37), but none flew often enough under UA 1537 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to JAC only.

One caution: this is a thin sample. 274 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 1537

For a booking, read UA 1537 as 84.9% on time with 0.00% cancelled over 274 flights. Those are rates from the past twelve months, not a forecast for any particular day.

Where to go next

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.

Key figures