Carrier route record
YXGRR→ORD
Republic Airways · Grand Rapids to Chicago
- Flights
- 666
- Period
- September 2025 to August 2026
- Share of route
- 16%
- Carriers
- 6
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Republic Airways.
Republic on GRR to ORD sits in the middle of the pack with a C−. About seven flights in ten arrive on time by the DOT's definition, 5 points worse than the national rate of 77.3%. The late ones land an hour and a half behind schedule. That rests on 666 flights. The strongest carrier on the route with a full sample, American Airlines, flew 480 at 74.0% on time.
American Airlines is the most reliable of the four carriers covered here at 74.0% on time across 480 flights.
Key figures
On time
72.5%
Arrivals under 15 minutes late, of 643 completed flights
Avg delay
84 min
Across delayed arrivals only, not all flights
Cancelled
3.45%
National rate is 1.89%
Whole route
69.1%
Every carrier on GRR to ORD, 4,079 flights
These figures cover 666 flights between September 2025 and August 2026. Beyond the headline rate, 11.2% 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 GRR to ORD
Republic flew 666 of the 4,079 flights on GRR to ORD, about 16% of it. Its 72.5% on time is 3 points better than the route as a whole, which runs 69.1%. Ranked by on-time rate it is number two of six carriers on the route, where the range runs from American at 74.0% to PSA at 0.0%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
The choice of carrier is not cosmetic here. American Airlines arrives on time 74.0% of the time; United Airlines manages 63.0%. Sample sizes sit next to every figure, because a two-point gap across 1,085 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| American Airlines | 480 | 74.0% | 138 min | 3.75% | C− |
| Republic Airways (this page) | 666 | 72.5% | 84 min | 3.45% | C− |
| SkyWest Airlines | 879 | 70.4% | 111 min | 3.75% | C− |
| Envoy Air | 967 | 70.2% | 72 min | 3.72% | C− |
| United Airlines | 1,085 | 63.0% | 78 min | 1.11% | D |
| PSA Airlinesthin sample | 2 | 0.0% | 690 min | 0.00% | F+ |
American Airlines cancels 3.8% 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.
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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 29 points, against 11 points between the best and worst carrier.
- 5am–8am163 flights82.7%
- 8am–11am8 flights—
- 11am–2pm296 flights71.3%
- 2pm–5pm62 flights74.6%
- 5pm–8pm45 flights53.7%
- 8pm–5am92 flights66.7%
Scale runs 45% to 90%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 53.7% on time, against 82.7% for the 5am–8am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 11am–2pm window is the busiest, with 296 flights scheduled in it.
Across the year
Republic on GRR to ORD through the year
July is the worst month at 64.9% on time, 23 points below August, the best at 87.5%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. December was the busiest month here, with 94 flights.
Across the week, Thursday is the strongest day at 84.5% on time and Sunday the weakest at 66.7%, a spread of 18 points.
Arrival by arrival
How late Republic on GRR to ORD runs when it is late
The 177 late arrivals split 66 under half an hour, 39 between 30 and 60 minutes, and 72 an hour or more.
- 15+ min early150 flights23.3%
- Within 15 min316 flights49.1%
- 15–29 min late66 flights10.3%
- 30–59 min late39 flights6.1%
- 1–2 hours late38 flights5.9%
- 2+ hours late34 flights5.3%
Scale runs 0% to 100%.
Share of 643 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 121 departures that left 15 minutes late or more, only 13 made it up before arrival. In the other direction, 69 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 GRR to ORD
The latest arrival of the period was on 3 April 2026, 13 hours behind schedule; most of its delay minutes were filed as national airspace system delay. The five worst days are spread across April, November, July and March, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 3 April 2026 | 13 hours | National Airspace System |
| 9 November 2025 | 8 hours 28 minutes | Late-arriving aircraft |
| 10 November 2025 | 7 hours 4 minutes | Carrier |
| 18 July 2026 | 6 hours 58 minutes | Late-arriving aircraft |
| 16 March 2026 | 6 hours 51 minutes | Carrier |
Delay causes
Why Republic runs late on this route
National Airspace System accounts for 42% of the 15,000 delay minutes carriers reported here, and the remaining four split what is left.
- 42%National Airspace System
- 38%Late-arriving aircraft
- 17%Carrier
- 3%Extreme weather
38% 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 14 to one. The split is drawn from 14,842 reported delay minutes.
42% 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 6,306 minutes out of 15,000, against a national NAS share of 21%.
Cancellations run at 3.45%, against 1.89% nationally. That is about one flight in 30 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
11.2% 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.
At 137 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 71.7% on time across 665 flights, within about a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
One caution: this is a thin sample. 666 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 Republic on GRR to ORD
Put together: the delay figures matter less here than the 3.45% cancellation rate. A late arrival costs you an hour and a half; a cancelled flight costs you the day. Book the 5am–8am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 643 completed flights over 12 months sit behind that.
Related
Where to go next
- GRR to ORD, every carrier
- Republic on ORD to GRR, the return leg
- American Airlines on GRR to ORD74.0%
- SkyWest Airlines on GRR to ORD70.4%
- Envoy Air on GRR to ORD70.2%
- United Airlines on GRR to ORD63.0%
- Republic Airways network-wide record
- Chicago O'Hare International (ORD) 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.