Flight number record

OO 5688

SkyWest Airlines · San Francisco to Tucson

Route: SFO → TUS
Departs: 18:25
Flights: 318
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 5688, 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 5688 lands a B+, 3 points 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 318 flights, with a median arrival 7 minutes early.

On time

80.8%

Arrivals under 15 minutes late, of 317 completed flights

Avg delay

64 min

Across delayed arrivals only, not all flights

Cancelled

0.31%

National rate is 1.81%

1 hour+ late

6.6%

National rate is 8.1%

These figures cover 318 flights between July 2025 and June 2026. The median arrival is 7 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 5688 flies

OO 5688 flies SFO to TUS without a single fixed slot. Its most common scheduled departure was 18:25, used on 86 of 318 flights, with 20:45 (67 flights) and 18:37 (37 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 18:2586 flights27.0%
Departs 20:4567 flights21.1%
Departs 18:3737 flights11.6%

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 18:25 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and OO 5688 runs 13 points better at 80.8%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

OO 5688 next to SFO to TUS

Every carrier on SFO to TUS combined arrived on time 79.7% of the time across 966 flights, so OO 5688 is about level with it. SkyWest flew 903 flights on the same city pair under all its flight numbers, including this one, and those ran 80.1% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 2 points.

OO 5688 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 5688thin sample	318	80.8%	64 min	0.31%	B+
All SkyWest Airlines on SFO–TUS	903	80.1%	60 min	0.33%	B+
All carriers on SFO–TUS	966	79.7%	59 min	0.31%	B+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 5688 quarter by quarter

Quarter by quarter OO 5688 held fairly steady: 84.9% in Jul–Sep 2025, 76.9% in Oct–Dec 2025, 84.9% in Jan–Mar 2026 and 75.0% in Apr–Jun 2026. A spread of 10 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202586 flights84.9%
Oct–Dec 202566 flights76.9%
Jan–Mar 202686 flights84.9%
Apr–Jun 202680 flights75.0%

Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, OO 5688 did best on Sunday at 87.2% on time and worst on Thursday at 73.9%. Each day rests on about 45 flights, so a gap of 13 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 5688 runs late

One category carries most of the weight here. National Airspace System accounts for 53% of the 3,929 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.

National Airspace System
53%
Late-arriving aircraft
27%
Carrier
17%
Extreme weather
2%
Security
1%

53% 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 2,063 minutes out of 3,929, against a national NAS share of 21%. The split is drawn from 3,929 delay minutes reported on OO 5688.

Cancellations are rare at 0.31%, 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

6.6% 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 751 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 two other city pairs in the data, including ORD to CAE (21) and ORD to FSD (3), but none flew often enough under OO 5688 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SFO to TUS only.

One caution: this is a thin sample. 318 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 5688

For a booking, read OO 5688 as 80.8% on time with 0.31% cancelled over 318 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