Flight number record
DL 1677
Delta Air Lines · Boston to Austin
- Route
- BOS → AUS
- Departs
- 17:45
- Flights
- 344
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1677, check with Delta Air Lines.
DL 1677 draws a D−. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is close to two hours behind schedule. Build slack into anything you connect to. That rests on 344 flights, with a median arrival right on schedule.
The national on-time rate over the same period is 77.3%, so DL 1677 runs 16 points behind the country as a whole. Across a thousand flights that is about 156 extra late arrivals.
Key figures
On time
61.7%
Arrivals under 15 minutes late, of 329 completed flights
Avg delay
102 min
Across delayed arrivals only, not all flights
Cancelled
4.07%
National rate is 1.89%
1 hour+ late
16.7%
National rate is 8.3%
These figures cover 344 flights between September 2025 and August 2026. Beyond the headline rate, 16.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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 1677 flies
DL 1677 flies BOS to AUS without a single fixed slot. Its most common scheduled departure was 17:45, used on 56 of 344 flights, with 18:59 (40 flights) and 19:45 (36 flights) next.
- Departs 17:4556 flights16.3%
- Departs 18:5940 flights11.6%
- Departs 19:4536 flights10.5%
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 17:45 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and DL 1677 runs 6 points worse at 61.7%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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 1677 next to BOS to AUS
Every carrier on BOS to AUS combined arrived on time 72.6% of the time across 1,713 flights, so DL 1677 is 11 points behind it. Delta flew 1,001 flights on the same city pair under all its flight numbers, including this one, and those ran 73.7% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 19 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1677thin sample | 344 | 61.7% | 102 min | 4.07% | D− |
| All Delta Air Lines on BOS–AUS | 1,001 | 73.7% | 87 min | 2.60% | C |
| All carriers on BOS–AUS | 1,713 | 72.6% | 74 min | 2.39% | C |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1677 quarter by quarter
DL 1677 did not run the same all year. Its best quarter was Jan–Mar 2026 at 78.5% on time and its weakest Jul–Sep 2026 at 47.1%, a swing of 31 points on roughly 86 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 202530 flights—
- Oct–Dec 202586 flights55.4%
- Jan–Mar 202687 flights78.5%
- Apr–Jun 202688 flights67.8%
- Jul–Sep 202653 flights47.1%
Scale runs 40% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1677 did best on Wednesday at 72.5% on time and worst on Monday at 53.1%. Each day rests on about 49 flights, so a gap of 19 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1677 runs when it is late
DL 1677 often beats the schedule: 110 of 329 completed flights, 33%, arrived 15 minutes or more early. The 126 late arrivals split 26 under half an hour, 45 between 30 and 60 minutes, and 55 an hour or more.
- 15+ min early110 flights33.4%
- Within 15 min93 flights28.3%
- 15–29 min late26 flights7.9%
- 30–59 min late45 flights13.7%
- 1–2 hours late29 flights8.8%
- 2+ hours late26 flights7.9%
Scale runs 0% to 100%.
Share of 329 completed flights by arrival against schedule.
19 of 127 late departures made up the time and arrived on time, 15% of them. In the other direction, 18 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at AUS.
The worst days
Worst days for DL 1677
The latest arrival of the period was on 25 September 2025, 19 hours 16 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. On three of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 25 September 2025 | 19 hours 16 minutes | National Airspace System |
| 5 January 2026 | 15 hours 29 minutes | Carrier |
| 9 February 2026 | 14 hours 57 minutes | Carrier |
| 15 January 2026 | 13 hours 52 minutes | Carrier |
| 21 July 2026 | 4 hours 42 minutes | Late-arriving aircraft |
Delay causes
Why DL 1677 runs late
Carrier accounts for 43% of the 13,000 delay minutes carriers reported here, and the remaining four split what is left.
- 43%Carrier
- 36%Late-arriving aircraft
- 21%National Airspace System
- 0%Extreme weather
36% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 13,000 reported delay minutes here, that single category outweighs weather by 36 to one. The split is drawn from 12,788 delay minutes reported on DL 1677.
Cancellations run at 4.07%, against 1.89% nationally. That is about one flight in 25 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
16.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
At 1,698 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
Every one of the 344 flights under DL 1677 in the data flew BOS to AUS. 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. 344 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 1677
For a booking, the cancellation rate is the figure to plan around on DL 1677: 4.07% of its 344 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 AUS, every carrier and departure
- AUS to BOS, the return direction
- Delta Air Lines 1410 on the same route83.6%
- Delta Air Lines 1297 on the same route74.3%
- Boston Logan International (BOS) delay statistics
- Austin-Bergstrom International (AUS) 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
- Why the first flight of the morning is statistically safest
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.