Flight number record
OO 5343
SkyWest Airlines · Denver to Gunnison
- Route
- DEN → GUC
- Departs
- 11:30
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5343, 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 5343 earns a B+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.3%. When something does go wrong the average delay runs roughly 55 minutes. That rests on 365 flights, with a median arrival 6 minutes early.
Set against the rest of the country, OO 5343's record is 7 points better than the US average of 77.3%. That gap is worth roughly 72 fewer late arrivals for every thousand flights.
Key figures
On time
84.5%
Arrivals under 15 minutes late, of 362 completed flights
Avg delay
53 min
Across delayed arrivals only, not all flights
Cancelled
0.55%
National rate is 1.89%
1 hour+ late
5.0%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. The median arrival is 6 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 5343 flies
OO 5343 flies DEN to GUC without a single fixed slot. Its most common scheduled departure was 11:30, used on 243 of 365 flights, with 11:15 (47 flights) and 11:45 (40 flights) next.
- Departs 11:30243 flights66.6%
- Departs 11:1547 flights12.9%
- Departs 11:4540 flights11.0%
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 11:30 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and OO 5343 runs 6 points better at 84.5%. 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 5343 next to DEN to GUC
Every carrier on DEN to GUC combined arrived on time 80.5% of the time across 994 flights, so OO 5343 is 4 points ahead of it. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 6 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5343 | 365 | 84.5% | 53 min | 0.55% | B+ |
| All SkyWest Airlines on DEN–GUC | 994 | 80.5% | 93 min | 0.80% | B+ |
| All carriers on DEN–GUC | 994 | 80.5% | 93 min | 0.80% | B+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 5343 quarter by quarter
Quarter by quarter OO 5343 held fairly steady: 90.0% in Jul–Sep 2025, 82.4% in Oct–Dec 2025, 84.1% in Jan–Mar 2026, 85.7% in Apr–Jun 2026 and 83.9% in Jul–Sep 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights90.0%
- Oct–Dec 202592 flights82.4%
- Jan–Mar 202690 flights84.1%
- Apr–Jun 202691 flights85.7%
- Jul–Sep 202662 flights83.9%
Scale runs 75% to 95%.
By weekday, OO 5343 ranged from 80.4% on Sunday to 90.2% on Saturday. With about 52 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late OO 5343 runs when it is late
The 56 late arrivals split 22 under half an hour, 16 between 30 and 60 minutes, and 18 an hour or more.
- 15+ min early87 flights24.0%
- Within 15 min219 flights60.5%
- 15–29 min late22 flights6.1%
- 30–59 min late16 flights4.4%
- 1–2 hours late15 flights4.1%
- 2+ hours late3 flights0.8%
Scale runs 0% to 100%.
Share of 362 completed flights by arrival against schedule.
9 of 46 late departures made up the time and arrived on time, 20% of them. In the other direction, 19 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 GUC.
The worst days
Worst days for OO 5343
The latest arrival of the period was on 1 December 2025, 3 hours 48 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across December, August and February, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 1 December 2025 | 3 hours 48 minutes | Late-arriving aircraft |
| 19 December 2025 | 3 hours 8 minutes | National Airspace System |
| 4 August 2026 | 2 hours 45 minutes | Carrier |
| 23 August 2026 | 1 hour 58 minutes | Late-arriving aircraft |
| 17 February 2026 | 1 hour 47 minutes | National Airspace System |
Delay causes
Why OO 5343 runs late
Carrier accounts for 43% of the 2,941 delay minutes carriers reported here, and the remaining four split what is left.
- 43%Carrier
- 29%Late-arriving aircraft
- 24%National Airspace System
- 4%Extreme weather
The largest share of delay minutes, 43%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,274 of the 2,941 delay minutes reported here. The split is drawn from 2,941 delay minutes reported on OO 5343.
Cancellations are rare at 0.55%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
5.0% 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 roughly 55 minutes, which a normal layover absorbs.
Every one of the 365 flights under OO 5343 in the data flew DEN to GUC. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 365 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 5343
For a booking, read OO 5343 as 84.5% on time with 0.55% cancelled over 365 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- DEN to GUC, every carrier and departure
- GUC to DEN, the return direction
- SkyWest Airlines 5377 on the same route71.7%
- 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
- Worst months to fly in the US, ranked by the data
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.