Flight number record
OO 5505
SkyWest Airlines · Chicago to South Bend
- Route
- ORD → SBN
- Departs
- 15:35
- Flights
- 315
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 3 minutes late.
The national on-time rate over the same period is 77.3%, so OO 5505 runs 15 points behind the country as a whole. Across a thousand flights that is about 150 extra late arrivals.
Key figures
On time
62.3%
Arrivals under 15 minutes late, of 297 completed flights
Avg delay
82 min
Across delayed arrivals only, not all flights
Cancelled
5.40%
National rate is 1.89%
1 hour+ late
17.5%
National rate is 8.3%
These figures cover 315 flights between September 2025 and August 2026. Beyond the headline rate, 17.5% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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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 166 of 315 flights, with 16:15 (46 flights) and 16:10 (34 flights) next.
- Departs 15:35166 flights52.7%
- Departs 16:1546 flights14.6%
- Departs 16:1034 flights10.8%
Scale runs 0% to 100%.
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 71.9%, and OO 5505 runs 10 points worse at 62.3%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
OO 5505 next to ORD to SBN
Every carrier on ORD to SBN combined arrived on time 63.1% of the time across 2,789 flights, so OO 5505 is about level with it. SkyWest flew 2,777 flights on the same city pair under all its flight numbers, including this one, and those ran 63.0% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 16 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5505thin sample | 315 | 62.3% | 82 min | 5.40% | D− |
| All SkyWest Airlines on ORD–SBN | 2,777 | 63.0% | 87 min | 4.39% | D− |
| All carriers on ORD–SBN | 2,789 | 63.1% | 87 min | 4.37% | D− |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 5505 quarter by quarter
OO 5505 did not run the same all year. Its best quarter was Jul–Sep 2025 at 76.7% on time and its weakest Jan–Mar 2026 at 53.0%, a swing of 24 points on roughly 63 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 202530 flights76.7%
- Oct–Dec 202570 flights75.0%
- Jan–Mar 202687 flights53.0%
- Apr–Jun 202666 flights54.8%
- Jul–Sep 202662 flights62.1%
Scale runs 45% to 80%.
By weekday, OO 5505 did best on Tuesday at 71.1% on time and worst on Saturday at 53.8%. Each day rests on about 45 flights, so a gap of 17 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 5505 runs when it is late
The 112 late arrivals split 37 under half an hour, 23 between 30 and 60 minutes, and 52 an hour or more.
- 15+ min early62 flights20.9%
- Within 15 min123 flights41.4%
- 15–29 min late37 flights12.5%
- 30–59 min late23 flights7.7%
- 1–2 hours late29 flights9.8%
- 2+ hours late23 flights7.7%
Scale runs 0% to 100%.
Share of 297 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 96 departures that left 15 minutes late or more, only 5 made it up before arrival. In the other direction, 21 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at SBN.
The worst days
Worst days for OO 5505
The latest arrival of the period was on 16 April 2026, 6 hours 30 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. Three of the five worst days fell in August 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 16 April 2026 | 6 hours 30 minutes | Late-arriving aircraft |
| 6 March 2026 | 5 hours 18 minutes | National Airspace System |
| 12 August 2026 | 5 hours 10 minutes | National Airspace System |
| 9 August 2026 | 4 hours 49 minutes | Extreme weather |
| 30 August 2026 | 4 hours 36 minutes | National Airspace System |
Delay causes
Why OO 5505 runs late
Late-arriving aircraft accounts for 43% of the 9,134 delay minutes carriers reported here, and the remaining four split what is left.
- 43%Late-arriving aircraft
- 26%National Airspace System
- 21%Carrier
- 11%Extreme weather
43% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 9,134 reported delay minutes here, that single category outweighs weather by 4 to one. The split is drawn from 9,134 delay minutes reported on OO 5505.
Cancellations run at 5.40%, against 1.89% 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
17.5% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection 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: 5.40% 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 5499 on the same route58.5%
- SkyWest Airlines 5274 on the same route67.0%
- SkyWest Airlines 4791 on the same route65.6%
- SkyWest Airlines 4636 on the same route52.4%
- SkyWest Airlines 5887 on the same route66.1%
- 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.