Flight number record

DL 2066

Delta Air Lines · Boston to Raleigh

Route: BOS → RDU
Departs: 06:30
Flights: 288
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 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 77.3%. When something does go wrong the average delay runs an hour and a half. That rests on 288 flights, with a median arrival 18 minutes early.

Set against the rest of the country, DL 2066's record is 13 points better than the US average of 77.3%. That gap is worth roughly 130 fewer late arrivals for every thousand flights.

On time

90.3%

Arrivals under 15 minutes late, of 278 completed flights

Avg delay

84 min

Across delayed arrivals only, not all flights

Cancelled

3.47%

National rate is 1.89%

1 hour+ late

5.0%

National rate is 8.3%

These figures cover 288 flights between September 2025 and August 2026. The median arrival is 18 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.

Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.

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 288 flights, with 06:20 (69 flights) and 06:35 (39 flights) next.

Departs 06:3087 flights30.2%
Departs 06:2069 flights24.0%
Departs 06:3539 flights13.5%

Scale runs 0% to 100%.

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 90.3%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.

Against the route

DL 2066 next to BOS to RDU

Every carrier on BOS to RDU combined arrived on time 75.5% of the time across 2,848 flights, so DL 2066 is 15 points ahead of it. Delta flew 1,436 flights on the same city pair under all its flight numbers, including this one, and those ran 77.1% on time. Across its whole network Delta Air Lines managed 81.1%, 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	288	90.3%	84 min	3.47%	A−
All Delta Air Lines on BOS–RDU	1,436	77.1%	85 min	2.65%	B
All carriers on BOS–RDU	2,848	75.5%	78 min	2.95%	B
Delta Air Lines, whole network	1,039,517	81.1%	71 min	1.74%	B

Across the year

DL 2066 quarter by quarter

Quarter by quarter DL 2066 held fairly steady: 91.4% in Oct–Dec 2025, 84.1% in Jan–Mar 2026, 93.5% in Apr–Jun 2026 and 92.3% in Jul–Sep 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 202528 flights—
Oct–Dec 202559 flights91.4%
Jan–Mar 202668 flights84.1%
Apr–Jun 202679 flights93.5%
Jul–Sep 202654 flights92.3%

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

By weekday, DL 2066 ranged from 85.0% on Sunday to 93.3% on Tuesday. With about 41 flights behind each day, a spread of 8 points is inside normal variation, so the day you fly is not worth changing for this flight.

Arrival by arrival

How late DL 2066 runs when it is late

DL 2066 often beats the schedule: 171 of 278 completed flights, 62%, arrived 15 minutes or more early. When DL 2066 is late it tends to be very late: 14 of its 27 late arrivals were an hour or more behind, and 7 were two hours or more.

15+ min early171 flights61.5%
Within 15 min80 flights28.8%
15–29 min late7 flights2.5%
30–59 min late6 flights2.2%
1–2 hours late7 flights2.5%
2+ hours late7 flights2.5%

Scale runs 0% to 100%.

Share of 278 completed flights by arrival against schedule.

Time lost at the gate mostly stays lost. Of 23 departures that left 15 minutes late or more, only 1 made it up before arrival. Only 5 left on time and still arrived late.

The worst days

Worst days for DL 2066

The latest arrival of the period was on 3 April 2026, 5 hours 24 minutes behind schedule; most of its delay minutes were filed as extreme weather. On four of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).

The latest arrivals of DL 2066 in the period
Date	Arrived late by	Largest filed cause
3 April 2026	5 hours 24 minutes	Extreme weather
28 September 2025	5 hours 14 minutes	Carrier
27 March 2026	2 hours 52 minutes	Carrier
11 December 2025	2 hours 28 minutes	Carrier
8 September 2025	2 hours 24 minutes	Carrier

Delay causes

Why DL 2066 runs late

Carrier accounts for 69% of the 2,276 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
69%
National Airspace System
16%
Extreme weather
14%

Extreme weather accounts for 14% 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 2.4 times the usual weather exposure. The split is drawn from 2,276 delay minutes reported on DL 2066.

Cancellations run at 3.47%, 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 routes

What a delay on this flight costs

5.0% 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 an hour and a half, 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.

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. 288 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: 3.47% of its 288 scheduled flights did not operate. A late arrival costs an hour and a half, 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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures