Flight number record

DL 464

Delta Air Lines · Boston to Salt Lake City

Route: BOS → SLC
Departs: 10:20
Flights: 353
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s DL 464, check with Delta Air Lines.

DL 464 lands a B+, about a point worse than the national rate of 77.3%. About one flight in four arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That rests on 353 flights, with a median arrival 1 minute early.

On time

76.2%

Arrivals under 15 minutes late, of 349 completed flights

Avg delay

88 min

Across delayed arrivals only, not all flights

Cancelled

0.85%

National rate is 1.89%

1 hour+ late

6.6%

National rate is 8.3%

These figures cover 353 flights between September 2025 and August 2026. On-time means an arrival less than 15 minutes after the scheduled gate time, the same threshold the Department of Transportation uses in its own reports. Cancelled and diverted flights are excluded from the on-time rate and counted separately, which is why the cancellation column matters on its own.

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Schedule

When DL 464 flies

DL 464 flies BOS to SLC without a single fixed slot. Its most common scheduled departure was 10:20, used on 97 of 353 flights, with 11:15 (74 flights) and 10:15 (53 flights) next.

Departs 10:2097 flights27.5%
Departs 11:1574 flights21.0%
Departs 10:1553 flights15.0%

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 10:20 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and DL 464 runs 8 points worse at 76.2%. 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 464 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 464 is 3 points ahead of 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 5 points.

DL 464 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 464thin sample	353	76.2%	88 min	0.85%	B+
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 464 quarter by quarter

DL 464 did not run the same all year. Its best quarter was Jul–Sep 2025 at 90.0% on time and its weakest Jul–Sep 2026 at 72.6%, a swing of 17 points on roughly 71 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 flights90.0%
Oct–Dec 202587 flights77.9%
Jan–Mar 202683 flights75.0%
Apr–Jun 202691 flights73.6%
Jul–Sep 202662 flights72.6%

Scale runs 65% to 95%.

By weekday, DL 464 ranged from 71.2% on Saturday to 82.4% on Monday. With about 50 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 464 runs when it is late

The 83 late arrivals split 32 under half an hour, 28 between 30 and 60 minutes, and 23 an hour or more.

15+ min early69 flights19.8%
Within 15 min197 flights56.4%
15–29 min late32 flights9.2%
30–59 min late28 flights8.0%
1–2 hours late9 flights2.6%
2+ hours late14 flights4.0%

Scale runs 0% to 100%.

Share of 349 completed flights by arrival against schedule.

12 of 57 late departures made up the time and arrived on time, 21% of them. In the other direction, 38 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 464

The latest arrival of the period was on 27 January 2026, 17 hours 6 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.

The latest arrivals of DL 464 in the period
Date	Arrived late by	Largest filed cause
27 January 2026	17 hours 6 minutes	Carrier
6 February 2026	9 hours 36 minutes	Carrier
18 September 2025	9 hours 5 minutes	Late-arriving aircraft
7 February 2026	6 hours 40 minutes	Carrier
19 January 2026	6 hours 30 minutes	Carrier

Delay causes

Why DL 464 runs late

Carrier accounts for 69% of the 7,325 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
69%
National Airspace System
19%
Late-arriving aircraft
12%
Extreme weather
0%

The largest share of delay minutes, 69%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 5,047 of the 7,325 delay minutes reported here. The split is drawn from 7,325 delay minutes reported on DL 464.

Cancellations are rare at 0.85%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.

Connections and routes

What a delay on this flight costs

6.6% 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 an hour and a half, 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 353 flights under DL 464 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. 353 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 464

For a booking, read DL 464 as 76.2% on time with 0.85% cancelled over 353 flights. Those are rates from the past twelve months, not a forecast for any particular day.

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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures