Carrier route record
YXPIT→ORD
Republic Airways · Pittsburgh to Chicago
- 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 PIT to ORD lands a B, 6 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That rests on 1,722 flights. The strongest carrier on the route with a full sample, United Airlines, flew 1,317 at 76.1% on time.
Set against the rest of the country, Republic's PIT to ORD record is 6 points better than the US average of 77.3%. That gap is worth roughly 57 fewer late arrivals for every thousand flights.
Key figures
On time
83.0%
Arrivals under 15 minutes late, of 1,691 completed flights
Avg delay
72 min
Across delayed arrivals only, not all flights
Cancelled
1.68%
National rate is 1.89%
Whole route
77.1%
Every carrier on PIT to ORD, 4,031 flights
These figures cover 1,722 flights between September 2025 and August 2026. The median arrival is 13 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.
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Carrier by carrier
Republic against every carrier on PIT to ORD
Republic flew 1,722 of the 4,031 flights on PIT to ORD, about 43% of it. Its 83.0% on time is 6 points better than the route as a whole, which runs 77.1%. Ranked by on-time rate it is first of five carriers on the route, where the range runs from Republic at 83.0% to American at 66.4%. 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 76.1% of the time; American Airlines manages 66.4%. Sample sizes sit next to every figure, because a two-point gap across 619 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Republic Airways (this page) | 1,722 | 83.0% | 72 min | 1.68% | B |
| United Airlines | 1,317 | 76.1% | 103 min | 2.20% | B |
| Envoy Airthin sample | 138 | 74.8% | 97 min | 2.17% | C |
| SkyWest Airlinesthin sample | 235 | 68.4% | 109 min | 4.26% | C− |
| American Airlines | 619 | 66.4% | 120 min | 3.07% | C− |
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 PIT to ORD
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Departure window
When Republic runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 15 points, against 10 points between the best and worst carrier.
- 5am–8am272 flights90.6%
- 8am–11am649 flights86.4%
- 11am–2pm293 flights81.3%
- 2pm–5pm340 flights76.6%
- 5pm–8pm145 flights75.9%
- 8pm–5am23 flights—
Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 90.6% of the time, against 75.9% for the evening window. That is 15 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8am–11am window is the busiest, with 649 flights scheduled in it.
Across the year
Republic on PIT to ORD through the year
December is the weak month at 69.9% on time, against 92.3% 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, Thursday is the strongest day at 86.4% on time and Sunday the weakest at 75.7%, a spread of 11 points.
Arrival by arrival
How late Republic on PIT to ORD runs when it is late
Republic on PIT to ORD often beats the schedule: 767 of 1,691 completed flights, 45%, arrived 15 minutes or more early. The 287 late arrivals split 88 under half an hour, 75 between 30 and 60 minutes, and 124 an hour or more.
- 15+ min early767 flights45.4%
- Within 15 min637 flights37.7%
- 15–29 min late88 flights5.2%
- 30–59 min late75 flights4.4%
- 1–2 hours late73 flights4.3%
- 2+ hours late51 flights3.0%
Scale runs 0% to 100%.
Share of 1,691 completed flights by arrival against schedule.
38 of 236 late departures made up the time and arrived on time, 16% of them. In the other direction, 89 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 ORD.
The worst days
Worst days for Republic on PIT to ORD
The latest arrival of the period was on 17 June 2026, 7 hours 42 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 17 June 2026 | 7 hours 42 minutes | National Airspace System |
| 7 December 2025 | 6 hours 14 minutes | National Airspace System |
| 31 March 2026 | 5 hours 28 minutes | National Airspace System |
| 17 July 2026 | 5 hours 23 minutes | Late-arriving aircraft |
| 31 August 2026 | 5 hours 9 minutes | National Airspace System |
Delay causes
Why Republic runs late on this route
National Airspace System accounts for 49% of the 21,000 delay minutes carriers reported here, and the remaining four split what is left.
- 49%National Airspace System
- 29%Late-arriving aircraft
- 12%Carrier
- 10%Extreme weather
- 0%Security
49% 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 10,000 minutes out of 21,000, against a national NAS share of 21%. The split is drawn from 20,744 reported delay minutes.
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 90.6% on time here.
Cancellations sit at 1.68% against a national 1.89%, which is ordinary. Diversions add another 0.12%.
Connections and stage length
What a delay here costs
7.3% 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 a little over an hour, 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 5am–8am window matters as much as it does.
The return leg runs 80.3% 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 PIT to ORD
Put together: the calendar is the biggest lever here, not the carrier or the hour. May runs 92.3% on time and December 69.9%, a swing of 22 points. If the dates move at all, move them out of December before you think about anything else. 1,691 completed flights over 12 months sit behind that.
Related
Where to go next
- PIT to ORD, every carrier
- Republic on ORD to PIT, the return leg
- United Airlines on PIT to ORD76.1%
- Envoy Air on PIT to ORD74.8%
- SkyWest Airlines on PIT to ORD68.4%
- American Airlines on PIT to ORD66.4%
- Republic Airways network-wide record
- Pittsburgh International (PIT) delay statistics
- Chicago O'Hare International (ORD) delay statistics
- The best time of day to fly, according to 7.05 million flight records
- Worst months to fly in the US, ranked by the data
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.