Flight number record

OO 5311

SkyWest Airlines · Denver to Tulsa

Route: DEN → TUL
Departs: 13:40
Flights: 361
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 5311, 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 5311 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 77.6%. When something does go wrong the average delay runs a little over an hour. That rests on 361 flights, with a median arrival 13 minutes early.

Set against the rest of the country, OO 5311's record is 12 points better than the US average of 77.6%. That gap is worth roughly 123 fewer late arrivals for every thousand flights.

On time

89.9%

Arrivals under 15 minutes late, of 356 completed flights

Avg delay

69 min

Across delayed arrivals only, not all flights

Cancelled

1.39%

National rate is 1.81%

1 hour+ late

4.5%

National rate is 8.1%

These figures cover 361 flights between July 2025 and June 2026. The median arrival is 13 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 5311 flies

OO 5311 flies DEN to TUL without a single fixed slot. Its most common scheduled departure was 13:40, used on 170 of 361 flights, with 13:30 (40 flights) and 13:35 (39 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 13:40170 flights47.1%
Departs 13:3040 flights11.1%
Departs 13:3539 flights10.8%

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 13:40 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and OO 5311 runs 11 points better at 89.9%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

OO 5311 next to DEN to TUL

Every carrier on DEN to TUL combined arrived on time 76.1% of the time across 2,432 flights, so OO 5311 is 14 points ahead of it. SkyWest flew 1,129 flights on the same city pair under all its flight numbers, including this one, and those ran 85.4% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 11 points.

OO 5311 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 5311thin sample	361	89.9%	69 min	1.39%	A
All SkyWest Airlines on DEN–TUL	1,129	85.4%	69 min	0.62%	A+
All carriers on DEN–TUL	2,432	76.1%	61 min	0.78%	B+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 5311 quarter by quarter

Quarter by quarter OO 5311 held fairly steady: 91.3% in Jul–Sep 2025, 91.0% in Oct–Dec 2025, 86.0% in Jan–Mar 2026 and 91.0% in Apr–Jun 2026. A spread of 5 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights91.3%
Oct–Dec 202591 flights91.0%
Jan–Mar 202689 flights86.0%
Apr–Jun 202689 flights91.0%

Scale runs 80% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, OO 5311 ranged from 84.6% on Sunday to 96.1% on Saturday. With about 52 flights behind each day, a spread of 12 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why OO 5311 runs late

One category carries most of the weight here. Carrier accounts for 50% of the 2,475 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
50%
Late-arriving aircraft
29%
National Airspace System
11%
Extreme weather
10%

The largest share of delay minutes, 50%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 1,226 of the 2,475 delay minutes reported here. The split is drawn from 2,475 delay minutes reported on OO 5311.

Cancellations sit at 1.39% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 4.5% land an hour or more behind schedule, against 8.1% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.

The 541 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 one other city pair in the data, including TUS to ORD (1), but none flew often enough under OO 5311 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to TUL only.

One caution: this is a thin sample. 361 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 5311

For a booking, OO 5311 has one of the better records a US domestic flight can show: 89.9% on time and 1.39% cancelled. That is a base rate, not a promise about any single 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