Flight number record

DL 497

Delta Air Lines · Boston to Las Vegas

Route: BOS → LAS
Departs: 07:40
Flights: 359
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 497, check with Delta Air Lines.

DL 497 lands a B, 4 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by roughly 55 minutes on average. That is a workable record, not a spotless one. That rests on 359 flights, with a median arrival 7 minutes early.

On time

81.4%

Arrivals under 15 minutes late, of 355 completed flights

Avg delay

54 min

Across delayed arrivals only, not all flights

Cancelled

1.11%

National rate is 1.81%

1 hour+ late

4.8%

National rate is 8.1%

These figures cover 359 flights between July 2025 and June 2026. The median arrival is 7 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 497 flies

DL 497 flies BOS to LAS without a single fixed slot. Its most common scheduled departure was 07:40, used on 77 of 359 flights, with 07:50 (66 flights) and 07:55 (65 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 07:4077 flights21.4%
Departs 07:5066 flights18.4%
Departs 07:5565 flights18.1%

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 07:40 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 497 runs 8 points worse at 81.4%. 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 497 next to BOS to LAS

Every carrier on BOS to LAS combined arrived on time 75.6% of the time across 1,638 flights, so DL 497 is 6 points ahead of it. Delta flew 593 flights on the same city pair under all its flight numbers, including this one, and those ran 77.9% on time. Across its whole network Delta Air Lines managed 81.6%, close to this flight's figure.

DL 497 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 497thin sample	359	81.4%	54 min	1.11%	B
All Delta Air Lines on BOS–LAS	593	77.9%	58 min	1.35%	B
All carriers on BOS–LAS	1,638	75.6%	66 min	1.22%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 497 quarter by quarter

Quarter by quarter DL 497 held fairly steady: 83.7% in Jul–Sep 2025, 81.5% in Oct–Dec 2025, 75.6% in Jan–Mar 2026 and 84.6% in Apr–Jun 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202586 flights83.7%
Oct–Dec 202592 flights81.5%
Jan–Mar 202690 flights75.6%
Apr–Jun 202691 flights84.6%

Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, DL 497 did best on Saturday at 88.2% on time and worst on Thursday at 66.7%. Each day rests on about 51 flights, so a gap of 22 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 497 runs late

One category carries most of the weight here. Carrier accounts for 49% of the 3,543 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
49%
National Airspace System
30%
Late-arriving aircraft
18%
Extreme weather
4%

The largest share of delay minutes, 49%, 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 1,738 of the 3,543 delay minutes reported here. The split is drawn from 3,543 delay minutes reported on DL 497.

Cancellations sit at 1.11% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 4.8% land an hour or more behind schedule, against 8.1% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.

At 2,381 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.

The same number turns up on one other city pair in the data, including LAS to BOS (86), but none flew often enough under DL 497 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to BOS to LAS only.

One caution: this is a thin sample. 359 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 497

For a booking, read DL 497 as 81.4% on time with 1.11% cancelled over 359 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