Flight number record

DL 1642

Delta Air Lines · Atlanta to Valparaiso

Route: ATL → VPS
Departs: 10:25
Flights: 307
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1642, check with Delta Air Lines.

DL 1642 earns an A. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 14 points better than the national rate of 77.6%. When something does go wrong the average delay runs about an hour. That rests on 307 flights, with a median arrival 11 minutes early.

Set against the rest of the country, DL 1642's record is 14 points better than the US average of 77.6%. That gap is worth roughly 137 fewer late arrivals for every thousand flights.

On time

91.3%

Arrivals under 15 minutes late, of 300 completed flights

Avg delay

65 min

Across delayed arrivals only, not all flights

Cancelled

1.95%

National rate is 1.81%

1 hour+ late

2.7%

National rate is 8.1%

These figures cover 307 flights between July 2025 and June 2026. The median arrival is 11 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 1642 flies

DL 1642 flies ATL to VPS without a single fixed slot. Its most common scheduled departure was 10:25, used on 54 of 307 flights, with 10:50 (42 flights) and 10:01 (33 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 10:2554 flights17.6%
Departs 10:5042 flights13.7%
Departs 10:0133 flights10.7%

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 10:25 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and DL 1642 runs 7 points better at 91.3%. 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 1642 next to ATL to VPS

Every carrier on ATL to VPS combined arrived on time 84.7% of the time across 2,387 flights, so DL 1642 is 7 points ahead of it. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 10 points.

DL 1642 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1642thin sample	307	91.3%	65 min	1.95%	A
All Delta Air Lines on ATL–VPS	2,387	84.7%	63 min	1.59%	B
All carriers on ATL–VPS	2,387	84.7%	63 min	1.59%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 1642 quarter by quarter

DL 1642 did not run the same all year. Its best quarter was Jul–Sep 2025 at 98.9% on time and its weakest Jan–Mar 2026 at 85.9%, a swing of 13 points on roughly 77 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 202592 flights98.9%
Oct–Dec 202590 flights89.8%
Jan–Mar 202689 flights85.9%
Apr–Jun 202636 flights88.6%

Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1642 did best on Wednesday at 97.8% on time and worst on Saturday at 85.0%. Each day rests on about 44 flights, so a gap of 13 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 1642 runs late

One category carries most of the weight here. Carrier accounts for 53% of the 1,698 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
53%
Late-arriving aircraft
37%
National Airspace System
7%
Extreme weather
4%

37% 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 1,698 reported delay minutes here, that single category outweighs weather by 10 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 1,698 delay minutes reported on DL 1642.

Cancellations sit at 1.95% against a national 1.81%, which is ordinary. Diversions add another 0.33%.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 2.7% 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.

The same number turns up on four other city pairs in the data, including VPS to ATL (247), TPA to JFK (31) and ATL to MCO (24), but none flew often enough under DL 1642 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ATL to VPS only.

One caution: this is a thin sample. 307 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 1642

For a booking, read DL 1642 as 91.3% on time with 1.95% cancelled over 307 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