Flight number record
OO 5311
SkyWest Airlines · Denver to Tulsa
- Route
- DEN → TUL
- Departs
- 13:40
- Flights
- 361
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5311, check with SkyWest Airlines. SkyWest Airlines flies under contract for larger airlines, so a ticket for this flight may show a different airline code and number.
OO 5311 earns an A. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 12 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 361 flights, with a median arrival 12 minutes early.
Set against the rest of the country, OO 5311's record is 12 points better than the US average of 77.3%. That gap is worth roughly 120 fewer late arrivals for every thousand flights.
Key figures
On time
89.3%
Arrivals under 15 minutes late, of 355 completed flights
Avg delay
61 min
Across delayed arrivals only, not all flights
Cancelled
1.66%
National rate is 1.89%
1 hour+ late
4.5%
National rate is 8.3%
These figures cover 361 flights between September 2025 and August 2026. The median arrival is 12 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 OO 5311 flies
OO 5311 flies DEN to TUL without a single fixed slot. Its most common scheduled departure was 13:40, used on 152 of 361 flights, with 13:30 (40 flights) and 13:32 (37 flights) next.
- Departs 13:40152 flights42.1%
- Departs 13:3040 flights11.1%
- Departs 13:3237 flights10.2%
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 13:40 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and OO 5311 runs 11 points better at 89.3%. 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
OO 5311 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 OO 5311 is 12 points ahead of it. SkyWest flew 1,172 flights on the same city pair under all its flight numbers, including this one, and those ran 86.1% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 11 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5311thin sample | 361 | 89.3% | 61 min | 1.66% | A |
| All SkyWest Airlines on DEN–TUL | 1,172 | 86.1% | 65 min | 0.68% | A+ |
| All carriers on DEN–TUL | 2,475 | 77.6% | 62 min | 1.01% | B |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 5311 quarter by quarter
Quarter by quarter OO 5311 held fairly steady: 93.3% in Jul–Sep 2025, 91.0% in Oct–Dec 2025, 86.0% in Jan–Mar 2026, 91.0% in Apr–Jun 2026 and 86.9% in Jul–Sep 2026. A spread of 7 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights93.3%
- Oct–Dec 202591 flights91.0%
- Jan–Mar 202689 flights86.0%
- Apr–Jun 202689 flights91.0%
- Jul–Sep 202662 flights86.9%
Scale runs 80% to 100%.
By weekday, OO 5311 did best on Saturday at 98.0% on time and worst on Sunday at 84.6%. Each day rests on about 52 flights, so a gap of 13 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 5311 runs when it is late
OO 5311 often beats the schedule: 146 of 355 completed flights, 41%, arrived 15 minutes or more early. The 38 late arrivals split 14 under half an hour, 8 between 30 and 60 minutes, and 16 an hour or more.
- 15+ min early146 flights41.1%
- Within 15 min171 flights48.2%
- 15–29 min late14 flights3.9%
- 30–59 min late8 flights2.3%
- 1–2 hours late11 flights3.1%
- 2+ hours late5 flights1.4%
Scale runs 0% to 100%.
Share of 355 completed flights by arrival against schedule.
8 of 38 late departures made up the time and arrived on time, 21% of them. 8 flights left on time and still arrived late.
The worst days
Worst days for OO 5311
The latest arrival of the period was on 29 December 2025, 2 hours 50 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across December, June, November and February, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 29 December 2025 | 2 hours 50 minutes | Carrier |
| 28 June 2026 | 2 hours 45 minutes | Late-arriving aircraft |
| 3 June 2026 | 2 hours 33 minutes | Carrier |
| 30 November 2025 | 2 hours 29 minutes | Extreme weather |
| 22 February 2026 | 2 hours 11 minutes | Late-arriving aircraft |
Delay causes
Why OO 5311 runs late
Carrier accounts for 46% of the 2,317 delay minutes carriers reported here, and the remaining four split what is left.
- 46%Carrier
- 36%Late-arriving aircraft
- 10%Extreme weather
- 8%National Airspace System
36% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 2,317 reported delay minutes here, that single category outweighs weather by 4 to one. The split is drawn from 2,317 delay minutes reported on OO 5311.
Cancellations sit at 1.66% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 4.5% 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 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 one other city pair in the data, including TUS to ORD (1), but none flew often enough under OO 5311 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. 361 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 OO 5311
For a booking, read OO 5311 as 89.3% on time with 1.66% cancelled over 361 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%
- United Airlines 1937 on the same route76.5%
- Denver International (DEN) delay statistics
- SkyWest Airlines on-time record
- Every SkyWest 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 SkyWest 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.