Carrier route record
YXORD→PIT
Republic Airways · Chicago to Pittsburgh
- Flights
- 1,722
- Period
- September 2025 to August 2026
- Share of route
- 43%
- Carriers
- 5
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Republic Airways.
Republic on ORD to PIT lands a B, 3 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That rests on 1,722 flights. The strongest carrier on the route with a full sample, United Airlines, flew 1,318 at 74.2% on time.
The US average over the same twelve months is 77.3%, so there is little to separate Republic on ORD to PIT from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
80.3%
Arrivals under 15 minutes late, of 1,677 completed flights
Avg delay
85 min
Across delayed arrivals only, not all flights
Cancelled
2.56%
National rate is 1.89%
Whole route
73.6%
Every carrier on ORD to PIT, 4,029 flights
These figures cover 1,722 flights between September 2025 and August 2026. Beyond the headline rate, 8.5% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Republic against every carrier on ORD to PIT
Republic flew 1,722 of the 4,029 flights on ORD to PIT, about 43% of it. Its 80.3% on time is 7 points better than the route as a whole, which runs 73.6%. Ranked by on-time rate it is first of five carriers on the route, where the range runs from Republic at 80.3% to American at 54.2%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.
The choice of carrier is not cosmetic here. United Airlines arrives on time 74.2% of the time; American Airlines manages 54.2%. Sample sizes sit next to every figure, because a two-point gap across 616 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Republic Airways (this page) | 1,722 | 80.3% | 85 min | 2.56% | B |
| Envoy Airthin sample | 138 | 80.0% | 68 min | 2.17% | B |
| United Airlines | 1,318 | 74.2% | 68 min | 1.37% | C |
| SkyWest Airlinesthin sample | 235 | 68.3% | 63 min | 3.40% | C− |
| American Airlines | 616 | 54.2% | 100 min | 3.08% | F− |
American Airlines cancels 3.1% of what it schedules here, the highest in the table. A cancelled flight never appears in an on-time rate, so read that column alongside the punctuality one rather than after it.
Flight by flight
Republic flight numbers on ORD to PIT
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Departure window
When Republic runs best on this route
Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 1,722 flights.
- 5am–8am27 flights—
- 8am–11am438 flights85.0%
- 11am–2pm248 flights82.8%
- 2pm–5pm263 flights81.9%
- 5pm–8pm220 flights77.0%
- 8pm–5am526 flights75.2%
Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 85.0% of the time, against 75.2% for the overnight window. That is 10 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8pm–5am window is the busiest, with 526 flights scheduled in it.
Across the year
Republic on ORD to PIT through the year
December is the weak month at 64.6% on time, against 88.9% in May. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. December was the busiest month here, with 184 flights.
Across the week, Tuesday is the strongest day at 83.8% on time and Sunday the weakest at 71.5%, a spread of 12 points.
Arrival by arrival
How late Republic on ORD to PIT runs when it is late
Republic on ORD to PIT often beats the schedule: 675 of 1,677 completed flights, 40%, arrived 15 minutes or more early. The 330 late arrivals split 96 under half an hour, 92 between 30 and 60 minutes, and 142 an hour or more.
- 15+ min early675 flights40.3%
- Within 15 min672 flights40.1%
- 15–29 min late96 flights5.7%
- 30–59 min late92 flights5.5%
- 1–2 hours late77 flights4.6%
- 2+ hours late65 flights3.9%
Scale runs 0% to 100%.
Share of 1,677 completed flights by arrival against schedule.
66 of 326 late departures made up the time and arrived on time, 20% of them. 70 flights left on time and still arrived late.
The worst days
Worst days for Republic on ORD to PIT
The latest arrival of the period was on 8 August 2026, 10 hours 52 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in August 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 8 August 2026 | 10 hours 52 minutes | Carrier |
| 2 July 2026 | 10 hours 5 minutes | Extreme weather |
| 31 August 2026 | 9 hours 53 minutes | Late-arriving aircraft |
| 9 August 2026 | 9 hours 47 minutes | Extreme weather |
| 24 June 2026 | 9 hours 14 minutes | Carrier |
Delay causes
Why Republic runs late on this route
Late-arriving aircraft accounts for 51% of the 28,000 delay minutes carriers reported here, and the remaining four split what is left.
- 51%Late-arriving aircraft
- 21%Carrier
- 15%National Airspace System
- 12%Extreme weather
Extreme weather accounts for 12% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the monthly strip above is the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.1 times the usual weather exposure. The split is drawn from 27,995 reported delay minutes.
51% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 28,000 reported delay minutes here, that single category outweighs weather by 4 to one.
Cancellations run at 2.56%, against 1.89% nationally. That is about one flight in 40 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 stage length
What a delay here costs
8.5% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last an hour and a half, which a normal layover absorbs.
At 413 miles this is a short hop, and stage length matters more than it looks. A flight this short spends under two hours in the air, which leaves almost nothing to claw back a late pushback with. Delay here is decided on the ground, in the turn, which is why the 8am–11am window matters as much as it does.
The return leg runs 83.0% on time across 1,722 flights, within 3 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
The sample behind these figures is 1,722 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
What to do with this
Booking Republic on ORD to PIT
Put together: the calendar is the biggest lever here, not the carrier or the hour. May runs 88.9% on time and December 64.6%, a swing of 24 points. If the dates move at all, move them out of December before you think about anything else. 1,677 completed flights over 12 months sit behind that.
Related
Where to go next
- ORD to PIT, every carrier
- Republic on PIT to ORD, the return leg
- Envoy Air on ORD to PIT80.0%
- United Airlines on ORD to PIT74.2%
- SkyWest Airlines on ORD to PIT68.3%
- American Airlines on ORD to PIT54.2%
- Republic Airways network-wide record
- Chicago O'Hare International (ORD) delay statistics
- Pittsburgh International (PIT) delay statistics
- The US routes with the most cancellations
- Why the first flight of the morning is statistically safest
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.