Flight number record

DL 445

Delta Air Lines · Boston to Salt Lake City

Route: BOS → SLC
Departs: 18:45
Flights: 344
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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, 9 points worse than the national rate of 77.6%. 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 77.6%, so DL 445 runs 9 points behind the country as a whole. Across a thousand flights that is about 85 extra late arrivals.

On time

69.1%

Arrivals under 15 minutes late, of 340 completed flights

Avg delay

57 min

Across delayed arrivals only, not all flights

Cancelled

1.16%

National rate is 1.81%

1 hour+ late

8.8%

National rate is 8.1%

These figures cover 344 flights between July 2025 and June 2026. Beyond the headline rate, 8.8% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

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 84 of 344 flights, with 18:50 (49 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 18:4584 flights24.4%
Departs 18:5049 flights14.2%

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 18:45 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and DL 445 runs level with that at 69.1%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

DL 445 next to BOS to SLC

Every carrier on BOS to SLC combined arrived on time 75.4% of the time across 1,256 flights, so DL 445 is 6 points behind it. Delta flew 1,083 flights on the same city pair under all its flight numbers, including this one, and those ran 77.8% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 13 points.

DL 445 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 445thin sample	344	69.1%	57 min	1.16%	C
All Delta Air Lines on BOS–SLC	1,083	77.8%	68 min	1.20%	B
All carriers on BOS–SLC	1,256	75.4%	65 min	1.51%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	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 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 202591 flights71.4%
Oct–Dec 202590 flights65.2%
Jan–Mar 202672 flights75.4%
Apr–Jun 202691 flights65.9%

Scale runs 55% to 80%. Rows with fewer than 30 flights show a dash.

By weekday, DL 445 did best on Monday at 82.0% on time and worst on Sunday at 45.1%. Each day rests on about 49 flights, so a gap of 37 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 445 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 50% of the 5,934 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.

Late-arriving aircraft
50%
National Airspace System
33%
Carrier
16%
Extreme weather
1%

50% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 5,934 reported delay minutes here, that single category outweighs weather by 46 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 5,934 delay minutes reported on DL 445.

Cancellations sit at 1.16% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

8.8% 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 about an hour, which a normal layover absorbs.

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, DL 445 is one of the weaker ways to fly BOS to SLC: 6 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.

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