Flight number record

OO 5556

SkyWest Airlines · Denver to Rapid City

Route: DEN → RAP
Departs: 13:25
Flights: 292
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 5556, 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 5556 lands a B, about a point better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 292 flights, with a median arrival 8 minutes early.

On time

78.6%

Arrivals under 15 minutes late, of 285 completed flights

Avg delay

61 min

Across delayed arrivals only, not all flights

Cancelled

1.71%

National rate is 1.81%

1 hour+ late

7.7%

National rate is 8.1%

These figures cover 292 flights between July 2025 and June 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.

Schedule

When OO 5556 flies

OO 5556 flies DEN to RAP without a single fixed slot. Its most common scheduled departure was 13:25, used on 197 of 292 flights, with 13:55 (58 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 13:25197 flights67.5%
Departs 13:5558 flights19.9%

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 13:25 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and OO 5556 runs level with that at 78.6%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

OO 5556 next to DEN to RAP

Every carrier on DEN to RAP combined arrived on time 77.9% of the time across 2,887 flights, so OO 5556 is about level with it. SkyWest flew 2,125 flights on the same city pair under all its flight numbers, including this one, and those ran 78.6% on time. Across its whole network SkyWest Airlines managed 79.0%, close to this flight's figure.

OO 5556 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 5556thin sample	292	78.6%	61 min	1.71%	B
All SkyWest Airlines on DEN–RAP	2,125	78.6%	70 min	1.41%	B
All carriers on DEN–RAP	2,887	77.9%	68 min	1.14%	B
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 5556 quarter by quarter

OO 5556 did not run the same all year. Its best quarter was Oct–Dec 2025 at 87.5% on time and its weakest Jan–Mar 2026 at 73.8%, a swing of 14 points on roughly 73 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 202592 flights74.7%
Oct–Dec 202575 flights87.5%
Jan–Mar 202663 flights73.8%
Apr–Jun 202662 flights78.7%

Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, OO 5556 did best on Wednesday at 89.7% on time and worst on Sunday at 72.5%. Each day rests on about 42 flights, so a gap of 17 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 5556 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 43% of the 3,692 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.

Late-arriving aircraft
43%
Carrier
41%
National Airspace System
12%
Extreme weather
4%

43% 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 3,692 reported delay minutes here, that single category outweighs weather by 11 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 3,692 delay minutes reported on OO 5556.

Cancellations sit at 1.71% against a national 1.81%, which is ordinary. Diversions add another 0.68%.

Connections and routes

What a delay on this flight costs

7.7% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.

The same number turns up on four other city pairs in the data, including LBB to DEN (20), ORD to MKE (16) and TUL to ORD (4), but none flew often enough under OO 5556 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to RAP only.

One caution: this is a thin sample. 292 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 5556

For a booking, read OO 5556 as 78.6% on time with 1.71% cancelled over 292 flights. Those are rates from the past twelve months, not a forecast for any particular day.

Where to go next

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.

Key figures