Flight number record

DL 497

Delta Air Lines · Boston to Las Vegas

Route: BOS → LAS
Departs: 07:50
Flights: 365
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 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 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 365 flights, with a median arrival 8 minutes early.

Set against the rest of the country, DL 497's record is 4 points better than the US average of 77.3%. That gap is worth roughly 41 fewer late arrivals for every thousand flights.

On time

81.4%

Arrivals under 15 minutes late, of 361 completed flights

Avg delay

57 min

Across delayed arrivals only, not all flights

Cancelled

1.10%

National rate is 1.89%

1 hour+ late

5.0%

National rate is 8.3%

These figures cover 365 flights between September 2025 and August 2026. The median arrival is 8 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.

Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.

Schedule

When DL 497 flies

DL 497 flies BOS to LAS without a single fixed slot. Its most common scheduled departure was 07:50, used on 128 of 365 flights, with 07:40 (77 flights) next.

Departs 07:50128 flights35.1%
Departs 07:4077 flights21.1%

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 07:50 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.

Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.

Against the route

DL 497 next to BOS to LAS

Every carrier on BOS to LAS combined arrived on time 74.7% of the time across 1,596 flights, so DL 497 is 7 points ahead of it. Delta flew 551 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%, close to this flight's figure.

DL 497 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 497	365	81.4%	57 min	1.10%	B
All Delta Air Lines on BOS–LAS	551	77.5%	59 min	1.27%	B
All carriers on BOS–LAS	1,596	74.7%	70 min	1.44%	C
Delta Air Lines, whole network	1,039,517	81.1%	71 min	1.74%	B

Across the year

DL 497 quarter by quarter

Quarter by quarter DL 497 held fairly steady: 80.0% in Jul–Sep 2025, 81.5% in Oct–Dec 2025, 75.6% in Jan–Mar 2026, 84.6% in Apr–Jun 2026 and 85.5% in Jul–Sep 2026. A spread of 10 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202530 flights80.0%
Oct–Dec 202592 flights81.5%
Jan–Mar 202690 flights75.6%
Apr–Jun 202691 flights84.6%
Jul–Sep 202662 flights85.5%

Scale runs 65% to 90%.

By weekday, DL 497 did best on Friday at 86.5% on time and worst on Thursday at 71.2%. Each day rests on about 52 flights, so a gap of 15 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late DL 497 runs when it is late

DL 497 often beats the schedule: 132 of 361 completed flights, 37%, arrived 15 minutes or more early. The 67 late arrivals split 30 under half an hour, 19 between 30 and 60 minutes, and 18 an hour or more.

15+ min early132 flights36.6%
Within 15 min162 flights44.9%
15–29 min late30 flights8.3%
30–59 min late19 flights5.3%
1–2 hours late14 flights3.9%
2+ hours late4 flights1.1%

Scale runs 0% to 100%.

Share of 361 completed flights by arrival against schedule.

A late pushback is often recovered here: of 62 departures that left 15 minutes late or more, 22 still arrived on time. In the other direction, 27 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 LAS.

The worst days

Worst days for DL 497

The latest arrival of the period was on 19 February 2026, 8 hours 9 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.

The latest arrivals of DL 497 in the period
Date	Arrived late by	Largest filed cause
19 February 2026	8 hours 9 minutes	Carrier
8 March 2026	5 hours 55 minutes	Carrier
3 August 2026	4 hours 22 minutes	National Airspace System
24 January 2026	2 hours 46 minutes	Carrier
27 December 2025	1 hour 59 minutes	Extreme weather

Delay causes

Why DL 497 runs late

Carrier accounts for 49% of the 3,805 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
49%
National Airspace System
35%
Late-arriving aircraft
13%
Extreme weather
3%

The largest share of delay minutes, 49%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,880 of the 3,805 delay minutes reported here. The split is drawn from 3,805 delay minutes reported on DL 497.

Cancellations sit at 1.10% against a national 1.89%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

5.0% 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 about an hour, which a normal layover absorbs.

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 (80), 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. 365 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 1.10% cancelled over 365 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