Flight number record
DL 445
Delta Air Lines · Boston to Salt Lake City
- Route
- BOS → SLC
- Departs
- 18:45
- Flights
- 344
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 445, check with Delta Air Lines.
DL 445 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 8 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 344 flights, with a median arrival 1 minute late.
The national on-time rate over the same period is 77.3%, so DL 445 runs 8 points behind the country as a whole. Across a thousand flights that is about 79 extra late arrivals.
Key figures
On time
69.4%
Arrivals under 15 minutes late, of 340 completed flights
Avg delay
59 min
Across delayed arrivals only, not all flights
Cancelled
1.16%
National rate is 1.89%
1 hour+ late
9.7%
National rate is 8.3%
These figures cover 344 flights between September 2025 and August 2026. Beyond the headline rate, 9.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 445 flies
DL 445 flies BOS to SLC without a single fixed slot. Its most common scheduled departure was 18:45, used on 80 of 344 flights, with 18:50 (54 flights) next.
- Departs 18:4580 flights23.3%
- Departs 18:5054 flights15.7%
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 18:45 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and DL 445 runs level with that at 69.4%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
DL 445 next to BOS to SLC
Every carrier on BOS to SLC combined arrived on time 73.4% of the time across 1,264 flights, so DL 445 is 4 points behind it. Delta flew 1,083 flights on the same city pair under all its flight numbers, including this one, and those ran 77.5% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 12 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 445thin sample | 344 | 69.4% | 59 min | 1.16% | C |
| All Delta Air Lines on BOS–SLC | 1,083 | 77.5% | 67 min | 1.20% | B |
| All carriers on BOS–SLC | 1,264 | 73.4% | 65 min | 1.82% | C |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 445 quarter by quarter
DL 445 did not run the same all year. Its best quarter was Jan–Mar 2026 at 75.4% on time and its weakest Oct–Dec 2025 at 65.2%, a swing of 10 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 202530 flights73.3%
- Oct–Dec 202590 flights65.2%
- Jan–Mar 202672 flights75.4%
- Apr–Jun 202691 flights65.9%
- Jul–Sep 202661 flights72.1%
Scale runs 55% to 80%.
By weekday, DL 445 did best on Friday at 84.0% on time and worst on Sunday at 47.1%. Each day rests on about 49 flights, so a gap of 37 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 445 runs when it is late
The 104 late arrivals split 36 under half an hour, 35 between 30 and 60 minutes, and 33 an hour or more.
- 15+ min early61 flights17.9%
- Within 15 min175 flights51.5%
- 15–29 min late36 flights10.6%
- 30–59 min late35 flights10.3%
- 1–2 hours late22 flights6.5%
- 2+ hours late11 flights3.2%
Scale runs 0% to 100%.
Share of 340 completed flights by arrival against schedule.
20 of 94 late departures made up the time and arrived on time, 21% of them. In the other direction, 30 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 SLC.
The worst days
Worst days for DL 445
The latest arrival of the period was on 14 October 2025, 5 hours 27 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 14 October 2025 | 5 hours 27 minutes | Late-arriving aircraft |
| 7 August 2026 | 4 hours 6 minutes | Carrier |
| 3 August 2026 | 4 hours 3 minutes | Late-arriving aircraft |
| 24 September 2025 | 3 hours 18 minutes | Late-arriving aircraft |
| 25 September 2025 | 2 hours 27 minutes | Late-arriving aircraft |
Delay causes
Why DL 445 runs late
Late-arriving aircraft accounts for 55% of the 6,104 delay minutes carriers reported here, and the remaining four split what is left.
- 55%Late-arriving aircraft
- 26%National Airspace System
- 19%Carrier
- 1%Extreme weather
55% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 6,104 reported delay minutes here, that single category outweighs weather by 51 to one. The split is drawn from 6,104 delay minutes reported on DL 445.
Cancellations sit at 1.16% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
9.7% 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 2,105 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 445 in the data flew BOS to SLC. 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 445
For a booking, read DL 445 as 69.4% on time with 1.16% cancelled over 344 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- BOS to SLC, every carrier and departure
- SLC to BOS, the return direction
- Delta Air Lines 859 on the same route87.2%
- Delta Air Lines 464 on the same route76.2%
- Boston Logan International (BOS) delay statistics
- Salt Lake City International (SLC) 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.