Flight number record

DL 464

Delta Air Lines · Boston to Salt Lake City

Route: BOS → SLC
Departs: 10:20
Flights: 353
Period: July 2025 to June 2026

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

DL 464 lands a B+, level with the national rate of 77.6%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That is a workable record, not a spotless one. That rests on 353 flights, with a median arrival 3 minutes early.

On time

77.0%

Arrivals under 15 minutes late, of 348 completed flights

Avg delay

96 min

Across delayed arrivals only, not all flights

Cancelled

0.85%

National rate is 1.81%

1 hour+ late

7.5%

National rate is 8.1%

These figures cover 353 flights between July 2025 and June 2026. The median arrival is 3 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.

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 10:05 (72 flights) and 10:15 (53 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 10:2097 flights27.5%
Departs 10:0572 flights20.4%
Departs 10:1553 flights15.0%

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 10:20 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and DL 464 runs 7 points worse at 77.0%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

DL 464 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 464 is 2 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 77.8% on time. Across its whole network Delta Air Lines managed 81.6%, 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	77.0%	96 min	0.85%	B+
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 464 quarter by quarter

Quarter by quarter DL 464 held fairly steady: 81.3% in Jul–Sep 2025, 77.9% in Oct–Dec 2025, 75.0% in Jan–Mar 2026 and 73.6% in Apr–Jun 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights81.3%
Oct–Dec 202587 flights77.9%
Jan–Mar 202683 flights75.0%
Apr–Jun 202691 flights73.6%

Scale runs 65% to 85%. Rows with fewer than 30 flights show a dash.

By weekday, DL 464 did best on Friday at 82.4% on time and worst on Saturday at 69.2%. Each day rests on about 50 flights, so a gap of 13 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 464 runs late

One category carries most of the weight here. Carrier accounts for 72% of the 7,670 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.

Carrier
72%
Late-arriving aircraft
14%
National Airspace System
13%
Extreme weather
1%

The largest share of delay minutes, 72%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 5,499 of the 7,670 delay minutes reported here. The split is drawn from 7,670 delay minutes reported on DL 464.

Cancellations are rare at 0.85%, below the national 1.81% 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

7.5% 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 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 77.0% 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures