Flight number record
OO 5315
SkyWest Airlines · Denver to Tulsa
- Route
- DEN → TUL
- Departs
- 10:04
- Flights
- 362
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5315, 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 5315 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 11 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 362 flights, with a median arrival 8 minutes early.
Set against the rest of the country, OO 5315's record is 11 points better than the US average of 77.3%. That gap is worth roughly 105 fewer late arrivals for every thousand flights.
Key figures
On time
87.8%
Arrivals under 15 minutes late, of 362 completed flights
Avg delay
58 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
2.5%
National rate is 8.3%
These figures cover 362 flights between September 2025 and August 2026. The median arrival is 8 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 5315 flies
OO 5315 flies DEN to TUL without a single fixed slot. Its most common scheduled departure was 10:04, used on 90 of 362 flights, with 10:00 (56 flights) and 09:50 (56 flights) next.
- Departs 10:0490 flights24.9%
- Departs 10:0056 flights15.5%
- Departs 09:5056 flights15.5%
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 10:04 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and OO 5315 runs 4 points better at 87.8%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
OO 5315 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 5315 is 10 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 9 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5315thin sample | 362 | 87.8% | 58 min | 0.00% | 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 5315 quarter by quarter
Quarter by quarter OO 5315 held fairly steady: 80.0% in Jul–Sep 2025, 87.9% in Oct–Dec 2025, 89.8% in Jan–Mar 2026, 87.9% in Apr–Jun 2026 and 88.7% in Jul–Sep 2026. A spread of 10 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights80.0%
- Oct–Dec 202591 flights87.9%
- Jan–Mar 202688 flights89.8%
- Apr–Jun 202691 flights87.9%
- Jul–Sep 202662 flights88.7%
Scale runs 70% to 95%.
By weekday, OO 5315 did best on Monday at 94.3% on time and worst on Thursday at 76.5%. Each day rests on about 52 flights, so a gap of 18 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 5315 runs when it is late
OO 5315 often beats the schedule: 115 of 362 completed flights, 32%, arrived 15 minutes or more early. Most of the lateness is short. 22 of the 44 late arrivals were under half an hour behind, and 9 reached an hour or more.
- 15+ min early115 flights31.8%
- Within 15 min203 flights56.1%
- 15–29 min late22 flights6.1%
- 30–59 min late13 flights3.6%
- 1–2 hours late5 flights1.4%
- 2+ hours late4 flights1.1%
Scale runs 0% to 100%.
Share of 362 completed flights by arrival against schedule.
A late pushback is often recovered here: of 37 departures that left 15 minutes late or more, 13 still arrived on time. In the other direction, 20 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at TUL.
The worst days
Worst days for OO 5315
The latest arrival of the period was on 19 December 2025, 8 hours 55 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 19 December 2025 | 8 hours 55 minutes | Late-arriving aircraft |
| 9 January 2026 | 4 hours 45 minutes | Late-arriving aircraft |
| 16 July 2026 | 3 hours 45 minutes | Late-arriving aircraft |
| 30 November 2025 | 2 hours 26 minutes | Extreme weather |
| 6 March 2026 | 1 hour 34 minutes | Carrier |
Delay causes
Why OO 5315 runs late
Late-arriving aircraft accounts for 61% of the 2,532 delay minutes carriers reported here, and the remaining four split what is left.
- 61%Late-arriving aircraft
- 30%Carrier
- 6%Extreme weather
- 3%National Airspace System
61% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 2,532 reported delay minutes here, that single category outweighs weather by 10 to one. The split is drawn from 2,532 delay minutes reported on OO 5315.
Cancellations are rare at 0.00%, below the national 1.89% 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
Badly late arrivals are rare here: only 2.5% 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 EGE to SFO (1), but none flew often enough under OO 5315 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. 362 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 5315
For a booking, OO 5315 has one of the better records a US domestic flight can show: 87.8% on time and 0.00% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- DEN to TUL, every carrier and departure
- TUL to DEN, the return direction
- SkyWest Airlines 5311 on the same route89.3%
- 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.