Flight number record
OO 4705
SkyWest Airlines · Denver to Helena
- Route
- DEN → HLN
- Departs
- 19:18
- Flights
- 331
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4705, 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 4705 sits in the middle of the pack with a B+. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 331 flights, with a median arrival 3 minutes early.
Key figures
On time
75.5%
Arrivals under 15 minutes late, of 327 completed flights
Avg delay
73 min
Across delayed arrivals only, not all flights
Cancelled
0.91%
National rate is 1.89%
1 hour+ late
9.8%
National rate is 8.3%
These figures cover 331 flights between September 2025 and August 2026. Beyond the headline rate, 9.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 4705 flies
OO 4705 flies DEN to HLN without a single fixed slot. Its most common scheduled departure was 19:18, used on 105 of 331 flights, with 19:15 (89 flights) next.
- Departs 19:18105 flights31.7%
- Departs 19:1589 flights26.9%
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 19:18 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and OO 4705 runs 8 points better at 75.5%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
OO 4705 next to DEN to HLN
Every carrier on DEN to HLN combined arrived on time 80.9% of the time across 783 flights, so OO 4705 is 5 points behind it. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4705thin sample | 331 | 75.5% | 73 min | 0.91% | B+ |
| All SkyWest Airlines on DEN–HLN | 783 | 80.9% | 70 min | 0.51% | B+ |
| All carriers on DEN–HLN | 783 | 80.9% | 70 min | 0.51% | B+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4705 quarter by quarter
OO 4705 did not run the same all year. Its best quarter was Oct–Dec 2025 at 82.4% on time and its weakest Jul–Sep 2026 at 61.0%, a swing of 21 points on roughly 66 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.
- Jul–Sep 202530 flights73.3%
- Oct–Dec 202591 flights82.4%
- Jan–Mar 202687 flights81.2%
- Apr–Jun 202662 flights72.6%
- Jul–Sep 202661 flights61.0%
Scale runs 55% to 90%.
By weekday, OO 4705 did best on Thursday at 84.4% on time and worst on Friday at 68.1%. Each day rests on about 47 flights, so a gap of 16 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 4705 runs when it is late
The 80 late arrivals split 23 under half an hour, 25 between 30 and 60 minutes, and 32 an hour or more.
- 15+ min early78 flights23.9%
- Within 15 min169 flights51.7%
- 15–29 min late23 flights7.0%
- 30–59 min late25 flights7.6%
- 1–2 hours late17 flights5.2%
- 2+ hours late15 flights4.6%
Scale runs 0% to 100%.
Share of 327 completed flights by arrival against schedule.
9 of 74 late departures made up the time and arrived on time, 12% of them. 15 flights left on time and still arrived late.
The worst days
Worst days for OO 4705
The latest arrival of the period was on 4 March 2026, 13 hours 22 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. The five worst days are spread across March, January, June and August, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 4 March 2026 | 13 hours 22 minutes | National Airspace System |
| 18 January 2026 | 3 hours 25 minutes | Late-arriving aircraft |
| 1 June 2026 | 3 hours 8 minutes | National Airspace System |
| 24 August 2026 | 3 hours 6 minutes | Carrier |
| 15 March 2026 | 2 hours 40 minutes | Carrier |
Delay causes
Why OO 4705 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 5,845 reported delay minutes.
- 41%National Airspace System
- 26%Carrier
- 21%Late-arriving aircraft
- 11%Extreme weather
- 1%Security
41% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 2,423 minutes out of 5,845, against a national NAS share of 21%. The split is drawn from 5,845 delay minutes reported on OO 4705.
Cancellations sit at 0.91% against a national 1.89%, which is ordinary. Diversions add another 0.30%.
Connections and routes
What a delay on this flight costs
9.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The 594 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 DEN to SAF (32) and ORD to DTW (1), but none flew often enough under OO 4705 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to HLN only.
One caution: this is a thin sample. 331 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 4705
For a booking, OO 4705 is one of the weaker ways to fly DEN to HLN: 5 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.
Related
Where to go next
- DEN to HLN, every carrier and departure
- HLN to DEN, the return direction
- SkyWest Airlines 5388 on the same route83.4%
- 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
- How often a connection fails at the major US hubs
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.