Flight number record
OO 5499
SkyWest Airlines · Chicago to South Bend
- Route
- ORD → SBN
- Departs
- 19:35
- Flights
- 355
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5499, 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 5499 draws a D−. Roughly one flight in two arrives at least 15 minutes late, and the typical late arrival is close to two hours behind schedule. Build slack into anything you connect to. That rests on 355 flights, with a median arrival 8 minutes late.
The national on-time rate over the same period is 77.3%, so OO 5499 runs 19 points behind the country as a whole. Across a thousand flights that is about 188 extra late arrivals.
Key figures
On time
58.5%
Arrivals under 15 minutes late, of 337 completed flights
Avg delay
108 min
Across delayed arrivals only, not all flights
Cancelled
4.23%
National rate is 1.89%
1 hour+ late
22.3%
National rate is 8.3%
These figures cover 355 flights between September 2025 and August 2026. Beyond the headline rate, 22.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 5499 flies
OO 5499 flies ORD to SBN without a single fixed slot. Its most common scheduled departure was 19:35, used on 154 of 355 flights, with 19:45 (112 flights) and 19:40 (68 flights) next.
- Departs 19:35154 flights43.4%
- Departs 19:45112 flights31.5%
- Departs 19:4068 flights19.2%
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 19:35 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and OO 5499 runs 10 points worse at 58.5%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
OO 5499 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 5499 is 5 points behind 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 20 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5499thin sample | 355 | 58.5% | 108 min | 4.23% | 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 5499 quarter by quarter
OO 5499 did not run the same all year. Its best quarter was Apr–Jun 2026 at 72.9% on time and its weakest Jan–Mar 2026 at 42.9%, a swing of 30 points on roughly 89 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 202527 flights—
- Oct–Dec 202585 flights57.8%
- Jan–Mar 202690 flights42.9%
- Apr–Jun 202691 flights72.9%
- Jul–Sep 202662 flights60.3%
Scale runs 35% to 80%. Rows with fewer than 30 flights show a dash.
By weekday, OO 5499 did best on Monday at 63.8% on time and worst on Saturday at 43.5%. Each day rests on about 51 flights, so a gap of 20 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 5499 runs when it is late
When OO 5499 is late it tends to be very late: 75 of its 140 late arrivals were an hour or more behind, and 41 were two hours or more.
- 15+ min early60 flights17.8%
- Within 15 min137 flights40.7%
- 15–29 min late24 flights7.1%
- 30–59 min late41 flights12.2%
- 1–2 hours late34 flights10.1%
- 2+ hours late41 flights12.2%
Scale runs 0% to 100%.
Share of 337 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 126 departures that left 15 minutes late or more, only 8 made it up before arrival. In the other direction, 22 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 5499
The latest arrival of the period was on 21 January 2026, 19 hours behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 21 January 2026 | 19 hours | Late-arriving aircraft |
| 4 July 2026 | 16 hours 22 minutes | Late-arriving aircraft |
| 30 December 2025 | 16 hours 16 minutes | Late-arriving aircraft |
| 8 November 2025 | 5 hours 15 minutes | Carrier |
| 30 November 2025 | 4 hours 51 minutes | Extreme weather |
Delay causes
Why OO 5499 runs late
Late-arriving aircraft accounts for 57% of the 15,000 delay minutes carriers reported here, and the remaining four split what is left.
- 57%Late-arriving aircraft
- 22%Carrier
- 16%National Airspace System
- 4%Extreme weather
57% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 15,000 reported delay minutes here, that single category outweighs weather by 13 to one. The split is drawn from 15,051 delay minutes reported on OO 5499.
Cancellations run at 4.23%, against 1.89% nationally. That is about one flight in 25 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
22.3% 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.
Every one of the 355 flights under OO 5499 in the data flew ORD to SBN. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 355 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 5499
For a booking, the cancellation rate is the figure to plan around on OO 5499: 4.23% of its 355 scheduled flights did not operate. A late arrival costs close to two hours, 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 5274 on the same route67.0%
- SkyWest Airlines 5505 on the same route62.3%
- 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.