Flight number record

UA 1937

United Airlines · Denver to Tulsa

Route: DEN → TUL
Departs: 17:25
Flights: 274
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s UA 1937, check with United Airlines.

UA 1937 lands a B, about a point worse than the national rate of 77.6%. About one flight in four arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That is a workable record, not a spotless one. That rests on 274 flights, with a median arrival 4 minutes early.

On time

76.4%

Arrivals under 15 minutes late, of 271 completed flights

Avg delay

77 min

Across delayed arrivals only, not all flights

Cancelled

1.09%

National rate is 1.81%

1 hour+ late

8.9%

National rate is 8.1%

These figures cover 274 flights between July 2025 and June 2026. Beyond the headline rate, 8.9% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When UA 1937 flies

UA 1937 flies DEN to TUL without a single fixed slot. Its most common scheduled departure was 17:25, used on 54 of 274 flights, with 17:58 (49 flights) and 18:10 (31 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 17:2554 flights19.7%
Departs 17:5849 flights17.9%
Departs 18:1031 flights11.3%

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 17:25 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and UA 1937 runs 8 points better at 76.4%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

UA 1937 next to DEN to TUL

Every carrier on DEN to TUL combined arrived on time 76.1% of the time across 2,432 flights, so UA 1937 is about level with it. Across its whole network United Airlines managed 79.0%, which this flight trails by 3 points.

UA 1937 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 1937thin sample	274	76.4%	77 min	1.09%	B
All United Airlines on DEN–TUL	367	76.6%	75 min	0.82%	B+
All carriers on DEN–TUL	2,432	76.1%	61 min	0.78%	B+
United Airlines, whole network	821,041	79.0%	72 min	1.01%	B

Across the year

UA 1937 quarter by quarter

UA 1937 did not run the same all year. Its best quarter was Oct–Dec 2025 at 89.4% on time and its weakest Jul–Sep 2025 at 49.0%, a swing of 40 points on roughly 69 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 202549 flights49.0%
Oct–Dec 202566 flights89.4%
Jan–Mar 202668 flights87.7%
Apr–Jun 202691 flights73.6%

Scale runs 40% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, UA 1937 did best on Sunday at 87.5% on time and worst on Friday at 62.2%. Each day rests on about 39 flights, so a gap of 25 points is worth noticing but could still narrow in another year.

Delay causes

Why UA 1937 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 66% of the 4,941 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.

Late-arriving aircraft
66%
Carrier
20%
National Airspace System
14%

66% 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 4,941 reported delay minutes here, that single category outweighs weather by 66 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 4,941 delay minutes reported on UA 1937.

Cancellations sit at 1.09% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

8.9% 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 a little over an hour, which a normal layover absorbs.

The 541 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 three other city pairs in the data, including RNO to DEN (153), SNA to DEN (98) and SFO to RNO (18), but none flew often enough under UA 1937 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to TUL 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 1937

For a booking, read UA 1937 as 76.4% on time with 1.09% 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