Flight number record
OO 5505
SkyWest Airlines · Chicago to South Bend
- Route
- ORD → SBN
- Departs
- 15:35
- Flights
- 315
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s OO 5505, 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 5505 draws a D−. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 315 flights, with a median arrival 5 minutes late.
The national on-time rate over the same period is 77.6%, so OO 5505 runs 16 points behind the country as a whole. Across a thousand flights that is about 164 extra late arrivals.
Key figures
On time
61.2%
Arrivals under 15 minutes late, of 299 completed flights
Avg delay
75 min
Across delayed arrivals only, not all flights
Cancelled
4.76%
National rate is 1.81%
1 hour+ late
17.4%
National rate is 8.1%
These figures cover 315 flights between July 2025 and June 2026. Beyond the headline rate, 17.4% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Schedule
When OO 5505 flies
OO 5505 flies ORD to SBN without a single fixed slot. Its most common scheduled departure was 15:35, used on 138 of 315 flights, with 15:40 (49 flights) and 16:15 (46 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 15:35138 flights43.8%
- Departs 15:4049 flights15.6%
- Departs 16:1546 flights14.6%
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 15:35 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and OO 5505 runs 11 points worse at 61.2%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Against the route
OO 5505 next to ORD to SBN
Every carrier on ORD to SBN combined arrived on time 62.7% of the time across 2,704 flights, so OO 5505 is 2 points behind it. SkyWest flew 2,692 flights on the same city pair under all its flight numbers, including this one, and those ran 62.5% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 18 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5505thin sample | 315 | 61.2% | 75 min | 4.76% | D− |
| All SkyWest Airlines on ORD–SBN | 2,692 | 62.5% | 87 min | 4.27% | D− |
| All carriers on ORD–SBN | 2,704 | 62.7% | 87 min | 4.25% | D− |
| SkyWest Airlines, whole network | 852,935 | 79.0% | 88 min | 1.77% | B |
Across the year
OO 5505 quarter by quarter
OO 5505 did not run the same all year. Its best quarter was Oct–Dec 2025 at 75.0% on time and its weakest Jan–Mar 2026 at 53.0%, a swing of 22 points on roughly 79 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 flights63.3%
- Oct–Dec 202570 flights75.0%
- Jan–Mar 202687 flights53.0%
- Apr–Jun 202666 flights54.8%
Scale runs 45% to 80%. Rows with fewer than 30 flights show a dash.
By weekday, OO 5505 did best on Tuesday at 68.9% on time and worst on Sunday at 50.0%. Each day rests on about 45 flights, so a gap of 19 points is worth noticing but could still narrow in another year.
Delay causes
Why OO 5505 runs late
One category carries most of the weight here. Late-arriving aircraft accounts for 46% of the 8,655 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.
- 46%Late-arriving aircraft
- 26%Carrier
- 20%National Airspace System
- 8%Extreme weather
46% 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 8,655 reported delay minutes here, that single category outweighs weather by 6 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 8,655 delay minutes reported on OO 5505.
Cancellations run at 4.76%, against 1.81% nationally. That is about one flight in twenty cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and routes
What a delay on this flight costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 17.4% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.
The same number turns up on three other city pairs in the data, including PNS to ORD (19), ORD to CVG (16) and SCE to ORD (1), but none flew often enough under OO 5505 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ORD to SBN only.
One caution: this is a thin sample. 315 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 5505
For a booking, the cancellation rate is the figure to plan around on OO 5505: 4.76% of its 315 scheduled flights did not operate. A late arrival costs a little over an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- ORD to SBN, every carrier and departure
- SBN to ORD, the return direction
- SkyWest Airlines 4791 on the same route67.8%
- SkyWest Airlines 5499 on the same route55.5%
- SkyWest Airlines 5274 on the same route69.3%
- SkyWest Airlines 4636 on the same route51.5%
- Chicago O'Hare International (ORD) 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
- Why the first flight of the morning is statistically safest
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.