Flight number record
OO 5315
SkyWest Airlines · Denver to Tulsa
- Route
- DEN → TUL
- Departs
- 09:55
- Flights
- 362
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 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 10 points better than the national rate of 77.6%. When something does go wrong the average delay runs roughly 50 minutes. That rests on 362 flights, with a median arrival 7 minutes early.
Set against the rest of the country, OO 5315's record is 10 points better than the US average of 77.6%. That gap is worth roughly 102 fewer late arrivals for every thousand flights.
Key figures
On time
87.8%
Arrivals under 15 minutes late, of 362 completed flights
Avg delay
52 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.81%
1 hour+ late
1.7%
National rate is 8.1%
These figures cover 362 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 OO 5315 flies
OO 5315 flies DEN to TUL without a single fixed slot. Its most common scheduled departure was 09:55, used on 101 of 362 flights, with 10:00 (56 flights) and 09:50 (56 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 09:55101 flights27.9%
- Departs 10:0056 flights15.5%
- Departs 09:5056 flights15.5%
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 09:55 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, 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.
Against the route
OO 5315 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 OO 5315 is 12 points ahead of it. SkyWest flew 1,129 flights on the same city pair under all its flight numbers, including this one, and those ran 85.4% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 9 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5315thin sample | 362 | 87.8% | 52 min | 0.00% | A+ |
| All SkyWest Airlines on DEN–TUL | 1,129 | 85.4% | 69 min | 0.62% | A+ |
| All carriers on DEN–TUL | 2,432 | 76.1% | 61 min | 0.78% | B+ |
| SkyWest Airlines, whole network | 852,935 | 79.0% | 88 min | 1.77% | B |
Across the year
OO 5315 quarter by quarter
Quarter by quarter OO 5315 held fairly steady: 85.9% in Jul–Sep 2025, 87.9% in Oct–Dec 2025, 89.8% in Jan–Mar 2026 and 87.9% in Apr–Jun 2026. A spread of 4 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202592 flights85.9%
- Oct–Dec 202591 flights87.9%
- Jan–Mar 202688 flights89.8%
- Apr–Jun 202691 flights87.9%
Scale runs 75% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, OO 5315 did best on Monday at 92.3% on time and worst on Thursday at 78.4%. Each day rests on about 52 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Delay causes
Why OO 5315 runs late
One category carries most of the weight here. Late-arriving aircraft accounts for 52% of the 2,276 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.
- 52%Late-arriving aircraft
- 38%Carrier
- 7%Extreme weather
- 3%National Airspace System
52% 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 2,276 reported delay minutes here, that single category outweighs weather by 7 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 2,276 delay minutes reported on OO 5315.
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
Badly late arrivals are rare here: only 1.7% land an hour or more behind schedule, against 8.1% 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. 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 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 route89.9%
- United Airlines 1937 on the same route76.4%
- 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.