Flight number record
DL 2118
Delta Air Lines · Boston to Raleigh
- Route
- BOS → RDU
- Departs
- 10:00
- Flights
- 275
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 77.3%. When something does go wrong the average delay runs close to two hours. That rests on 275 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 77.3%. That gap is worth roughly 110 fewer late arrivals for every thousand flights.
Key figures
On time
88.3%
Arrivals under 15 minutes late, of 266 completed flights
Avg delay
102 min
Across delayed arrivals only, not all flights
Cancelled
3.27%
National rate is 1.89%
1 hour+ late
6.8%
National rate is 8.3%
These figures cover 275 flights between September 2025 and August 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.
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Schedule
When DL 2118 flies
DL 2118 flies BOS to RDU without a single fixed slot. Its most common scheduled departure was 10:00, used on 95 of 275 flights, with 09:55 (61 flights) and 10:05 (44 flights) next.
- Departs 10:0095 flights34.5%
- Departs 09:5561 flights22.2%
- Departs 10:0544 flights16.0%
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 10:00 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, 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.
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Against the route
DL 2118 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 2118 is 13 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 7 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2118thin sample | 275 | 88.3% | 102 min | 3.27% | 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 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 69 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 202526 flights—
- Oct–Dec 202579 flights80.8%
- Jan–Mar 202663 flights91.4%
- Apr–Jun 202667 flights95.4%
- Jul–Sep 202640 flights87.2%
Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, DL 2118 ranged from 87.2% on Thursday to 91.8% on Wednesday. With about 39 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.
Arrival by arrival
How late DL 2118 runs when it is late
DL 2118 often beats the schedule: 125 of 266 completed flights, 47%, arrived 15 minutes or more early. When DL 2118 is late it tends to be very late: 18 of its 31 late arrivals were an hour or more behind, and 8 were two hours or more.
- 15+ min early125 flights47.0%
- Within 15 min110 flights41.4%
- 15–29 min late4 flights1.5%
- 30–59 min late9 flights3.4%
- 1–2 hours late10 flights3.8%
- 2+ hours late8 flights3.0%
Scale runs 0% to 100%.
Share of 266 completed flights by arrival against schedule.
6 of 35 late departures made up the time and arrived on time, 17% of them. Only 2 left on time and still arrived late.
The worst days
Worst days for DL 2118
The latest arrival of the period was on 17 November 2025, 6 hours 47 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 17 November 2025 | 6 hours 47 minutes | Carrier |
| 11 September 2025 | 6 hours 40 minutes | Carrier |
| 3 August 2026 | 3 hours 45 minutes | Late-arriving aircraft |
| 27 March 2026 | 2 hours 53 minutes | Carrier |
| 19 January 2026 | 2 hours 37 minutes | Late-arriving aircraft |
Delay causes
Why DL 2118 runs late
Carrier accounts for 66% of the 3,174 delay minutes carriers reported here, and the remaining four split what is left.
- 66%Carrier
- 25%Late-arriving aircraft
- 8%National Airspace System
The largest share of delay minutes, 66%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,109 of the 3,174 delay minutes reported here. The split is drawn from 3,174 delay minutes reported on DL 2118.
Cancellations run at 3.27%, 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
6.8% 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 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.
Every one of the 275 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. 275 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: 3.27% of its 275 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.
Related
Where to go next
- BOS to RDU, every carrier and departure
- RDU to BOS, the return direction
- Delta Air Lines 2782 on the same route72.6%
- Delta Air Lines 817 on the same route54.1%
- Delta Air Lines 2066 on the same route90.3%
- JetBlue Airways 1883 on the same route87.7%
- JetBlue Airways 2783 on the same route62.6%
- Boston Logan International (BOS) delay statistics
- Raleigh-Durham International (RDU) delay statistics
- Delta Air Lines on-time record
- Every Delta Air Lines flight number with a record
- The most and least reliable flight numbers in the US
- What a cancellation rate actually tells you (and what it hides)
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 ; recomputed monthly. How this data is collected.