Carrier route record
OOGRR→DTW
SkyWest Airlines · Grand Rapids to Detroit
- Flights
- 1,459
- Period
- September 2025 to August 2026
- Share of route
- 90%
- Carriers
- 3
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with SkyWest Airlines.
SkyWest on GRR to DTW lands a B+, about a point better than the national rate of 77.3%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by close to two hours on average. That rests on 1,459 flights, with a median arrival 10 minutes early.
The US average over the same twelve months is 77.3%, so there is little to separate SkyWest on GRR to DTW from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
78.1%
Arrivals under 15 minutes late, of 1,444 completed flights
Avg delay
106 min
Across delayed arrivals only, not all flights
Cancelled
0.96%
National rate is 1.89%
Whole route
79.6%
Every carrier on GRR to DTW, 1,620 flights
These figures cover 1,459 flights between September 2025 and August 2026. Beyond the headline rate, 12.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
SkyWest against every carrier on GRR to DTW
SkyWest flew 1,459 of the 1,620 flights on GRR to DTW, most of the route. Its 78.1% on time is 2 points worse than the route as a whole, which runs 79.6%. Ranked by on-time rate it is number two of three carriers on the route, where the range runs from Republic at 94.4% to Delta at 76.5%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Republic Airwaysthin sample | 144 | 94.4% | 46 min | 0.00% | A+ |
| SkyWest Airlines (this page) | 1,459 | 78.1% | 106 min | 0.96% | B+ |
| Delta Air Linesthin sample | 17 | 76.5% | 98 min | 0.00% | B+ |
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Departure window
When SkyWest runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 14 points, against half a point between the best and worst carrier.
- 5am–8am171 flights87.0%
- 8am–11am551 flights81.2%
- 11am–2pm4 flights—
- 2pm–5pm434 flights74.1%
- 5pm–8pm298 flights73.1%
- 8pm–5am1 flights—
Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 87.0% of the time, against 73.1% for the evening window. That is 14 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 551 flights scheduled in it.
Across the year
SkyWest on GRR to DTW through the year
December is the weak month at 47.7% on time, against 92.0% in September. 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. November was the busiest month here, with 190 flights.
Across the week, Saturday is the strongest day at 81.9% on time and Sunday the weakest at 76.0%, a spread of 6 points.
Arrival by arrival
How late SkyWest on GRR to DTW runs when it is late
SkyWest on GRR to DTW often beats the schedule: 502 of 1,444 completed flights, 35%, arrived 15 minutes or more early. When SkyWest on GRR to DTW is late it tends to be very late: 174 of its 316 late arrivals were an hour or more behind, and 97 were two hours or more.
- 15+ min early502 flights34.8%
- Within 15 min626 flights43.4%
- 15–29 min late65 flights4.5%
- 30–59 min late77 flights5.3%
- 1–2 hours late77 flights5.3%
- 2+ hours late97 flights6.7%
Scale runs 0% to 100%.
Share of 1,444 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 329 departures that left 15 minutes late or more, only 38 made it up before arrival. Only 25 left on time and still arrived late.
The worst days
Worst days for SkyWest on GRR to DTW
The latest arrival of the period was on 15 January 2026, 8 hours 42 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 15 January 2026 | 8 hours 42 minutes | Carrier |
| 25 January 2026 | 7 hours 49 minutes | Carrier |
| 13 April 2026 | 7 hours 38 minutes | Carrier |
| 30 November 2025 | 7 hours 28 minutes | Carrier |
| 8 December 2025 | 6 hours 51 minutes | Carrier |
Delay causes
Why SkyWest runs late on this route
Carrier accounts for 67% of the 34,000 delay minutes carriers reported here, and the remaining four split what is left.
- 67%Carrier
- 24%Extreme weather
- 9%National Airspace System
Extreme weather accounts for 24% 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 4.0 times the usual weather exposure. The split is drawn from 33,596 reported delay minutes.
The largest share of delay minutes, 67%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 22,000 of the 34,000 delay minutes reported here.
Cancellations sit at 0.96% against a national 1.89%, which is ordinary. Diversions add another 0.07%.
Connections and stage length
What a delay here costs
12.0% 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 120 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 is a different operation and performs like one: it runs 73.4% on time across 1,459 flights, 5 points below this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 5 points of difference.
The sample behind these figures is 1,459 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 SkyWest on GRR to DTW
Put together: the calendar is the biggest lever here, not the carrier or the hour. September runs 92.0% on time and December 47.7%, a swing of 44 points. If the dates move at all, move them out of December before you think about anything else. 1,444 completed flights over 12 months sit behind that.
Related
Where to go next
- GRR to DTW, every carrier
- SkyWest on DTW to GRR, the return leg
- Republic Airways on GRR to DTW94.4%
- SkyWest Airlines network-wide record
- Detroit Metropolitan Wayne County (DTW) delay statistics
- The best time of day to fly, according to 7.05 million flight records
- How often a connection fails at the major US hubs
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.