Flight number record
OO 4004
SkyWest Airlines · Redmond to Salt Lake City
- Route
- RDM → SLC
- Departs
- 05:05
- Flights
- 255
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4004, 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 4004 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 3.1 hours. That rests on 255 flights, with a median arrival 14 minutes early.
Set against the rest of the country, OO 4004's record is 12 points better than the US average of 77.3%. That gap is worth roughly 124 fewer late arrivals for every thousand flights.
Key figures
On time
89.7%
Arrivals under 15 minutes late, of 252 completed flights
Avg delay
187 min
Across delayed arrivals only, not all flights
Cancelled
1.18%
National rate is 1.89%
1 hour+ late
7.5%
National rate is 8.3%
These figures cover 255 flights between September 2025 and August 2026. The median arrival is 14 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 4004 flies
OO 4004 flies RDM to SLC without a single fixed slot. Its most common scheduled departure was 05:05, used on 63 of 255 flights, with 05:50 (48 flights) and 05:15 (36 flights) next.
- Departs 05:0563 flights24.7%
- Departs 05:5048 flights18.8%
- Departs 05:1536 flights14.1%
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 05:05 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and OO 4004 runs level with that at 89.7%. 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 4004 next to RDM to SLC
Every carrier on RDM to SLC combined arrived on time 91.0% of the time across 729 flights, so OO 4004 is about level with it. 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 4004thin sample | 255 | 89.7% | 187 min | 1.18% | A |
| All SkyWest Airlines on RDM–SLC | 729 | 91.0% | 113 min | 0.82% | A+ |
| All carriers on RDM–SLC | 729 | 91.0% | 113 min | 0.82% | A+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4004 quarter by quarter
OO 4004 did not run the same all year. Its best quarter was Apr–Jun 2026 at 96.7% on time and its weakest Jan–Mar 2026 at 86.2%, a swing of 11 points on roughly 85 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.
- Oct–Dec 202512 flights—
- Jan–Mar 202690 flights86.2%
- Apr–Jun 202691 flights96.7%
- Jul–Sep 202662 flights88.7%
Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, OO 4004 ranged from 86.1% on Tuesday to 91.9% on Saturday. With about 36 flights behind each day, a spread of 6 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late OO 4004 runs when it is late
OO 4004 often beats the schedule: 118 of 252 completed flights, 47%, arrived 15 minutes or more early. When OO 4004 is late it tends to be very late: 19 of its 26 late arrivals were an hour or more behind, and 13 were two hours or more.
- 15+ min early118 flights46.8%
- Within 15 min108 flights42.9%
- 15–29 min late6 flights2.4%
- 30–59 min late1 flights0.4%
- 1–2 hours late6 flights2.4%
- 2+ hours late13 flights5.2%
Scale runs 0% to 100%.
Share of 252 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 25 departures that left 15 minutes late or more, only 1 made it up before arrival. Only 2 left on time and still arrived late.
The worst days
Worst days for OO 4004
The latest arrival of the period was on 18 June 2026, 17 hours 14 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in January 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 18 June 2026 | 17 hours 14 minutes | Carrier |
| 20 January 2026 | 9 hours 9 minutes | Extreme weather |
| 19 January 2026 | 7 hours 30 minutes | Extreme weather |
| 11 March 2026 | 6 hours 4 minutes | Carrier |
| 21 January 2026 | 5 hours 20 minutes | Extreme weather |
Delay causes
Why OO 4004 runs late
Carrier accounts for 64% of the 4,858 delay minutes carriers reported here, and the remaining four split what is left.
- 64%Carrier
- 34%Extreme weather
- 1%National Airspace System
- 0%Security
Extreme weather accounts for 34% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 5.7 times the usual weather exposure. The split is drawn from 4,858 delay minutes reported on OO 4004.
Cancellations sit at 1.18% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
7.5% 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 about 3.1 hours, which a normal layover absorbs.
The 525 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.
Every one of the 255 flights under OO 4004 in the data flew RDM to SLC. 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. 255 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 4004
For a booking, OO 4004 has one of the better records a US domestic flight can show: 89.7% on time and 1.18% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- RDM to SLC, every carrier and departure
- SLC to RDM, the return direction
- Salt Lake City International (SLC) 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.