Flight number record

DL 2118

Delta Air Lines · Boston to Raleigh

Route: BOS → RDU
Departs: 09:45
Flights: 289
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 2118, check with Delta Air Lines.

DL 2118 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 77.6%. When something does go wrong the average delay runs close to two hours. That rests on 289 flights, with a median arrival 14 minutes early.

Set against the rest of the country, DL 2118's record is 11 points better than the US average of 77.6%. That gap is worth roughly 107 fewer late arrivals for every thousand flights.

On time

88.3%

Arrivals under 15 minutes late, of 281 completed flights

Avg delay

102 min

Across delayed arrivals only, not all flights

Cancelled

2.77%

National rate is 1.81%

1 hour+ late

6.8%

National rate is 8.1%

These figures cover 289 flights between July 2025 and June 2026. The median arrival is 14 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 2118 flies

DL 2118 flies BOS to RDU without a single fixed slot. Its most common scheduled departure was 09:45, used on 66 of 289 flights, with 09:55 (64 flights) and 10:00 (55 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 09:4566 flights22.8%
Departs 09:5564 flights22.1%
Departs 10:0055 flights19.0%

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 09:45 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and DL 2118 runs 4 points better at 88.3%. 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 2118 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 2118 is 12 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 7 points.

DL 2118 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2118thin sample	289	88.3%	102 min	2.77%	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 2118 quarter by quarter

DL 2118 did not run the same all year. Its best quarter was Apr–Jun 2026 at 95.4% on time and its weakest Oct–Dec 2025 at 80.8%, a swing of 15 points on roughly 72 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.

Jul–Sep 202580 flights87.5%
Oct–Dec 202579 flights80.8%
Jan–Mar 202663 flights91.4%
Apr–Jun 202667 flights95.4%

Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, DL 2118 ranged from 86.0% on Tuesday to 91.1% on Monday. With about 41 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 2118 runs late

One category carries most of the weight here. Carrier accounts for 77% of the 3,349 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
77%
Late-arriving aircraft
19%
National Airspace System
4%

The largest share of delay minutes, 77%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 2,566 of the 3,349 delay minutes reported here. The split is drawn from 3,349 delay minutes reported on DL 2118.

Cancellations run at 2.77%, against 1.81% nationally. That is roughly one flight in 40 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

6.8% 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.

Every one of the 289 flights under DL 2118 in the data flew BOS to RDU. The number was not reused on any other city pair, which makes this a clean record of one route.

One caution: this is a thin sample. 289 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 2118

For a booking, the cancellation rate is the figure to plan around on DL 2118: 2.77% of its 289 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