Flight number record

OO 5506

SkyWest Airlines · Denver to Arcata/Eureka

Route: DEN → ACV
Departs: 11:20
Flights: 311
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 5506, 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 5506 lands a B+, 4 points better than the national rate of 77.6%. Roughly 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 311 flights, with a median arrival 4 minutes early.

Set against the rest of the country, OO 5506's record is 4 points better than the US average of 77.6%. That gap is worth roughly 42 fewer late arrivals for every thousand flights.

On time

81.8%

Arrivals under 15 minutes late, of 307 completed flights

Avg delay

68 min

Across delayed arrivals only, not all flights

Cancelled

0.64%

National rate is 1.81%

1 hour+ late

7.8%

National rate is 8.1%

These figures cover 311 flights between July 2025 and June 2026. The median arrival is 4 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 5506 flies

OO 5506 flies DEN to ACV without a single fixed slot. Its most common scheduled departure was 11:20, used on 96 of 311 flights, with 11:15 (92 flights) and 11:29 (49 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 11:2096 flights30.9%
Departs 11:1592 flights29.6%
Departs 11:2949 flights15.8%

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 11:20 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and OO 5506 runs 3 points better at 81.8%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

OO 5506 next to DEN to ACV

Every carrier on DEN to ACV combined arrived on time 79.6% of the time across 378 flights, so OO 5506 is 2 points ahead of it. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 3 points.

OO 5506 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 5506thin sample	311	81.8%	68 min	0.64%	B+
All SkyWest Airlines on DEN–ACV	378	79.6%	83 min	0.53%	B+
All carriers on DEN–ACV	378	79.6%	83 min	0.53%	B+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 5506 quarter by quarter

OO 5506 did not run the same all year. Its best quarter was Oct–Dec 2025 at 90.0% on time and its weakest Jan–Mar 2026 at 70.9%, a swing of 19 points on roughly 78 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 flights87.8%
Oct–Dec 202591 flights90.0%
Jan–Mar 202687 flights70.9%
Apr–Jun 202641 flights73.2%

Scale runs 60% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, OO 5506 did best on Wednesday at 92.9% on time and worst on Friday at 75.6%. Each day rests on about 44 flights, so a gap of 17 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 5506 runs late

One category carries most of the weight here. Carrier accounts for 45% of the 3,783 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.

Carrier
45%
Late-arriving aircraft
39%
National Airspace System
15%
Extreme weather
1%

39% 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 3,783 reported delay minutes here, that single category outweighs weather by 39 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 3,783 delay minutes reported on OO 5506.

Cancellations are rare at 0.64%, below the national 1.81% 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

7.8% 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 1,026 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 four other city pairs in the data, including IND to ORD (28), GSO to ORD (19) and ACV to LAX (5), but none flew often enough under OO 5506 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to ACV only.

One caution: this is a thin sample. 311 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 5506

For a booking, read OO 5506 as 81.8% on time with 0.64% cancelled over 311 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