Flight number record
DL 1707
Delta Air Lines · Detroit to Boston
- Route
- DTW → BOS
- Departs
- 17:59
- Flights
- 265
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1707, check with Delta Air Lines.
DL 1707 earns a D−, which is as low as this site's scale goes for a reason. Only 55.5% of flights arrive inside the 15-minute window, 22 points worse than the national rate of 77.3%. Late arrivals average a little over an hour. Treat any tight connection here as a coin flip. That rests on 265 flights, with a median arrival 10 minutes late.
The national on-time rate over the same period is 77.3%, so DL 1707 runs 22 points behind the country as a whole. Across a thousand flights that is about 218 extra late arrivals.
Key figures
On time
55.5%
Arrivals under 15 minutes late, of 256 completed flights
Avg delay
70 min
Across delayed arrivals only, not all flights
Cancelled
3.40%
National rate is 1.89%
1 hour+ late
20.3%
National rate is 8.3%
These figures cover 265 flights between September 2025 and August 2026. Beyond the headline rate, 20.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 1707 flies
DL 1707 flies DTW to BOS without a single fixed slot. Its most common scheduled departure was 17:59, used on 80 of 265 flights, with 17:56 (77 flights) next.
- Departs 17:5980 flights30.2%
- Departs 17:5677 flights29.1%
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 17:59 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and DL 1707 runs 13 points worse at 55.5%. 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 1707 next to DTW to BOS
Every carrier on DTW to BOS combined arrived on time 73.6% of the time across 2,572 flights, so DL 1707 is 18 points behind it. Delta flew 1,716 flights on the same city pair under all its flight numbers, including this one, and those ran 74.6% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 26 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1707thin sample | 265 | 55.5% | 70 min | 3.40% | D− |
| All Delta Air Lines on DTW–BOS | 1,716 | 74.6% | 65 min | 1.98% | C |
| All carriers on DTW–BOS | 2,572 | 73.6% | 71 min | 2.72% | C |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1707 quarter by quarter
DL 1707 did not run the same all year. Its best quarter was Jan–Mar 2026 at 68.1% on time and its weakest Jul–Sep 2026 at 38.8%, a swing of 29 points on roughly 66 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 202518 flights—
- Oct–Dec 202571 flights61.4%
- Jan–Mar 202651 flights68.1%
- Apr–Jun 202675 flights56.9%
- Jul–Sep 202650 flights38.8%
Scale runs 30% to 75%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1707 ranged from 50.0% on Thursday to 61.4% on Monday. With about 38 flights behind each day, a spread of 11 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 1707 runs when it is late
The 114 late arrivals split 29 under half an hour, 33 between 30 and 60 minutes, and 52 an hour or more.
- 15+ min early31 flights12.1%
- Within 15 min111 flights43.4%
- 15–29 min late29 flights11.3%
- 30–59 min late33 flights12.9%
- 1–2 hours late34 flights13.3%
- 2+ hours late18 flights7.0%
Scale runs 0% to 100%.
Share of 256 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 106 departures that left 15 minutes late or more, only 11 made it up before arrival. In the other direction, 19 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 BOS.
The worst days
Worst days for DL 1707
The latest arrival of the period was on 10 November 2025, 4 hours 34 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 10 November 2025 | 4 hours 34 minutes | National Airspace System |
| 18 May 2026 | 4 hours 13 minutes | Carrier |
| 7 July 2026 | 3 hours 55 minutes | National Airspace System |
| 5 December 2025 | 3 hours 36 minutes | Late-arriving aircraft |
| 18 June 2026 | 3 hours 22 minutes | National Airspace System |
Delay causes
Why DL 1707 runs late
National Airspace System accounts for 57% of the 7,934 delay minutes carriers reported here, and the remaining four split what is left.
- 57%National Airspace System
- 28%Carrier
- 14%Late-arriving aircraft
- 1%Extreme weather
57% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 4,557 minutes out of 7,934, against a national NAS share of 21%. The split is drawn from 7,934 delay minutes reported on DL 1707.
Cancellations run at 3.40%, 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
20.3% 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.
The 632 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 ATL to BOS (5), but none flew often enough under DL 1707 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DTW to BOS only.
One caution: this is a thin sample. 265 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 1707
For a booking, the cancellation rate is the figure to plan around on DL 1707: 3.40% of its 265 scheduled flights did not operate. A late arrival costs a little over an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- DTW to BOS, every carrier and departure
- BOS to DTW, the return direction
- Delta Air Lines 1163 on the same route91.0%
- Delta Air Lines 2648 on the same route82.7%
- Delta Air Lines 1187 on the same route70.3%
- Delta Air Lines 1171 on the same route68.2%
- Detroit Metropolitan Wayne County (DTW) delay statistics
- Boston Logan International (BOS) 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
- How often a connection fails at the major US hubs
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.