Flight number record

DL 2066

Delta Air Lines · Boston to Raleigh

Route: BOS → RDU
Departs: 06:30
Flights: 283
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 2066, check with Delta Air Lines.

DL 2066 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 13 points better than the national rate of 77.6%. When something does go wrong the average delay runs close to two hours. That rests on 283 flights, with a median arrival 17 minutes early.

Set against the rest of the country, DL 2066's record is 13 points better than the US average of 77.6%. That gap is worth roughly 129 fewer late arrivals for every thousand flights.

On time

90.5%

Arrivals under 15 minutes late, of 273 completed flights

Avg delay

102 min

Across delayed arrivals only, not all flights

Cancelled

3.53%

National rate is 1.81%

1 hour+ late

5.5%

National rate is 8.1%

These figures cover 283 flights between July 2025 and June 2026. The median arrival is 17 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.

Schedule

When DL 2066 flies

DL 2066 flies BOS to RDU without a single fixed slot. Its most common scheduled departure was 06:30, used on 87 of 283 flights, with 06:25 (56 flights) and 06:35 (39 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 06:3087 flights30.7%
Departs 06:2556 flights19.8%
Departs 06:3539 flights13.8%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.

A 06:30 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 2066 runs level with that at 90.5%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

DL 2066 next to BOS to RDU

Every carrier on BOS to RDU combined arrived on time 76.3% of the time across 2,816 flights, so DL 2066 is 14 points ahead of it. Delta flew 1,437 flights on the same city pair under all its flight numbers, including this one, and those ran 77.6% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 9 points.

DL 2066 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2066thin sample	283	90.5%	102 min	3.53%	A−
All Delta Air Lines on BOS–RDU	1,437	77.6%	86 min	2.44%	B
All carriers on BOS–RDU	2,816	76.3%	76 min	2.41%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 2066 quarter by quarter

Quarter by quarter DL 2066 held fairly steady: 92.0% in Jul–Sep 2025, 91.4% in Oct–Dec 2025, 84.1% in Jan–Mar 2026 and 93.5% in Apr–Jun 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202577 flights92.0%
Oct–Dec 202559 flights91.4%
Jan–Mar 202668 flights84.1%
Apr–Jun 202679 flights93.5%

Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, DL 2066 ranged from 88.6% on Thursday to 93.2% on Tuesday. With about 40 flights behind each day, a spread of 5 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why DL 2066 runs late

One category carries most of the weight here. Carrier accounts for 64% of the 2,644 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Carrier
64%
National Airspace System
13%
Extreme weather
12%
Late-arriving aircraft
11%

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 quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.0 times the usual weather exposure. The split is drawn from 2,644 delay minutes reported on DL 2066.

Cancellations run at 3.53%, against 1.81% 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 routes

What a delay on this flight costs

5.5% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last close to two hours, which a normal layover absorbs.

The 612 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

The same number turns up on one other city pair in the data, including DFW to DTW (13), but none flew often enough under DL 2066 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to BOS to RDU only.

One caution: this is a thin sample. 283 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 DL 2066

For a booking, the cancellation rate is the figure to plan around on DL 2066: 3.53% of its 283 scheduled flights did not operate. A late arrival costs close to two hours, but a cancellation costs the day, so leave a later option open.

Where to go next

A flight number here means Delta Air Lines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.

Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures