Flight number record
UA 1937
United Airlines · Denver to Tulsa
- Route
- DEN → TUL
- Departs
- 17:25
- Flights
- 286
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 77.3%. 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 rests on 286 flights, with a median arrival 5 minutes early.
Key figures
On time
76.5%
Arrivals under 15 minutes late, of 281 completed flights
Avg delay
78 min
Across delayed arrivals only, not all flights
Cancelled
1.75%
National rate is 1.89%
1 hour+ late
7.8%
National rate is 8.3%
These figures cover 286 flights between September 2025 and August 2026. The median arrival is 5 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.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
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 286 flights, with 17:37 (41 flights) and 17:35 (35 flights) next.
- Departs 17:2554 flights18.9%
- Departs 17:3741 flights14.3%
- Departs 17:3535 flights12.2%
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 17:25 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and UA 1937 runs 9 points better at 76.5%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Against the route
UA 1937 next to DEN to TUL
Every carrier on DEN to TUL combined arrived on time 77.6% of the time across 2,475 flights, so UA 1937 is about level with it. Across its whole network United Airlines managed 78.8%, which this flight trails by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1937thin sample | 286 | 76.5% | 78 min | 1.75% | B |
| All United Airlines on DEN–TUL | 366 | 77.6% | 77 min | 1.37% | B |
| All carriers on DEN–TUL | 2,475 | 77.6% | 62 min | 1.01% | B |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | 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 2026 at 54.2%, a swing of 35 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.
- Oct–Dec 202566 flights89.4%
- Jan–Mar 202668 flights87.7%
- Apr–Jun 202691 flights73.6%
- Jul–Sep 202661 flights54.2%
Scale runs 45% to 95%.
By weekday, UA 1937 ranged from 72.5% on Wednesday to 83.3% on Sunday. With about 41 flights behind each day, a spread of 11 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late UA 1937 runs when it is late
UA 1937 often beats the schedule: 75 of 281 completed flights, 27%, arrived 15 minutes or more early. The 66 late arrivals split 24 under half an hour, 20 between 30 and 60 minutes, and 22 an hour or more.
- 15+ min early75 flights26.7%
- Within 15 min140 flights49.8%
- 15–29 min late24 flights8.5%
- 30–59 min late20 flights7.1%
- 1–2 hours late9 flights3.2%
- 2+ hours late13 flights4.6%
Scale runs 0% to 100%.
Share of 281 completed flights by arrival against schedule.
11 of 63 late departures made up the time and arrived on time, 17% of them. 14 flights left on time and still arrived late.
The worst days
Worst days for UA 1937
The latest arrival of the period was on 22 July 2026, 5 hours 10 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. Three of the five worst days fell in July 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 22 July 2026 | 5 hours 10 minutes | Late-arriving aircraft |
| 28 July 2026 | 5 hours 4 minutes | Carrier |
| 19 December 2025 | 4 hours 51 minutes | Late-arriving aircraft |
| 29 July 2026 | 4 hours 36 minutes | Late-arriving aircraft |
| 22 August 2026 | 4 hours 7 minutes | Late-arriving aircraft |
Delay causes
Why UA 1937 runs late
Late-arriving aircraft accounts for 61% of the 5,147 delay minutes carriers reported here, and the remaining four split what is left.
- 61%Late-arriving aircraft
- 24%Carrier
- 14%National Airspace System
- 1%Extreme weather
61% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 5,147 reported delay minutes here, that single category outweighs weather by 61 to one. The split is drawn from 5,147 delay minutes reported on UA 1937.
Cancellations sit at 1.75% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
7.8% 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 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.
The same number turns up on two other city pairs in the data, including SNA to DEN (98) and RNO to DEN (91), 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. 286 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 76.5% on time with 1.75% cancelled over 286 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- DEN to TUL, every carrier and departure
- TUL to DEN, the return direction
- SkyWest Airlines 5315 on the same route87.8%
- SkyWest Airlines 5311 on the same route89.3%
- 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.