Route reliability record
RDU→DTW
Raleigh to Detroit
- Flights
- 1,480
- Period
- September 2025 to August 2026
- Distance
- 501 mi
- Carriers
- 3
This route earns an A. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 11 points better than the national rate of 77.3%. When something does go wrong the average delay runs an hour and a half. That rests on 1,480 RDU to DTW flights, with a median arrival 12 minutes early.
Best time to fly RDU to DTW: a 5am–8am departure, ideally on a Wednesday. Flights in that window arrived on time 93.6% of the time and Wednesday flights 92.4%, against 88.6% for the route overall.
Set against the rest of the country, this route's record is 11 points better than the US average of 77.3%. That gap is worth roughly 113 fewer late arrivals for every thousand flights.
Key figures
On time
88.6%
Arrivals under 15 minutes late, of 1,458 completed flights
Avg delay
82 min
Across delayed arrivals only, not all flights
Cancelled
1.49%
National rate is 1.89%
Best carrier
Delta
88.6% on time across 1,333 flights
These figures cover 1,480 flights between September 2025 and August 2026. The median arrival is 12 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
Which airline is most reliable on RDU to DTW
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 |
|---|---|---|---|---|---|
| Spirit Airlinesthin sample | 33 | 90.9% | 80 min | 0.00% | A+ |
| Delta Air Lines | 1,333 | 88.6% | 85 min | 1.58% | A |
| Frontier Airlinesthin sample | 114 | 87.6% | 52 min | 0.88% | A+ |
Flight by flight
Flights on RDU to DTW
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
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Departure window
The best time of day to leave
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 12 points, against half a point between the best and worst carrier.
- 5am–8am365 flights93.6%
- 8am–11am329 flights92.2%
- 11am–2pm366 flights88.1%
- 2pm–5pm45 flights86.7%
- 5pm–8pm374 flights81.3%
- 8pm–5am1 flights—
Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 93.6% of the time, against 81.3% for the evening window. That is 12 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5pm–8pm window is the busiest, with 374 flights scheduled in it.
Explore
Filter RDU to DTW by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On RDU to DTW, the best departure window is 5am–8am at 93.6% on time and the worst is 5pm–8pm at 81.3%, a wide gap of 12.3 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am93.6%
- 8–11am92.2%
- 11am–2pm88.1%
- 2–5pm86.7%
- 5–8pm81.3%
- 8pm–5am—
best all US flightsScale 60% to 100%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 20 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
December is the weak month at 75.4% on time, against 95.7% in October. 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 150 flights.
Across the week, Wednesday is the strongest day at 92.4% on time and Sunday the weakest at 83.1%, a spread of 9 points.
Delay causes
Why this route gets delayed
Late-arriving aircraft accounts for 45% of the 14,000 delay minutes carriers reported here, and the remaining four split what is left.
- 45%Late-arriving aircraft
- 27%Carrier
- 27%National Airspace System
- 1%Extreme weather
45% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 14,000 reported delay minutes here, that single category outweighs weather by 33 to one. The split is drawn from 13,667 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 93.6% on time here.
Cancellations sit at 1.49% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and stage length
What a delay here actually costs
Badly late arrivals are rare here: only 4.6% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The 501 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The return leg is a different operation and performs like one: it runs 84.3% on time across 1,480 flights, 4 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 4 points of difference.
The sample behind these figures is 1,480 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.
Work out the risk of missing a connection in DTW after this flight
What to do with this
Booking this route
Put together: the calendar is the biggest lever here, not the carrier or the hour. October runs 95.7% on time and December 75.4%, a swing of 20 points. If the dates move at all, move them out of December before you think about anything else. 1,458 completed flights over 12 months sit behind that.
Common questions
RDU to DTW questions
How often is RDU to DTW delayed?
About one flight in nine arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 11.4% of the 1,480 flights in this analysis, against 22.7% nationally. Delayed flights are late by an hour and a half on average.
How reliable is RDU to DTW compared with the rest of the country?
88.6% of flights arrive on time here against a national 77.3%, a difference of 11 points in its favour. That is worth a A on this site's grading scale.
What time of day has the fewest delays on RDU to DTW?
The 5am–8am departure window is the strongest at 93.6% on time. The 5pm–8pm window is the weakest at 81.3%, 12 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are December delays on RDU to DTW?
December is the weakest month at 75.4% on time, compared with 95.7% in October. Across the year that is 20 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- DTW to RDU — the return legseparate record
- Raleigh-Durham International (RDU) delay statistics
- Detroit Metropolitan Wayne County (DTW) delay statistics
- Delta Air Lines on RDU to DTW88.6%
- Frontier Airlines on RDU to DTW87.6%
- RDU to ATL, a related route86.5%
- ORD to DTW, a related route71.1%
- RDU to ORD, a related route74.3%
- Spirit Airlines on-time record90.9%
- Delta Air Lines on-time record88.6%
- Frontier Airlines on-time record87.6%
- The most punctual routes in the US, and the least
- Why the first flight of the morning is statistically safest
Direction matters. RDU to DTW and DTW to RDU are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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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.