Flight number record

DL 432

Delta Air Lines · Washington to Salt Lake City

Route: IAD → SLC
Departs: 07:05
Flights: 364
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s DL 432, check with Delta Air Lines.

DL 432 earns an A. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 8 points better than the national rate of 77.3%. When something does go wrong the average delay runs an hour and a half. That rests on 364 flights, with a median arrival 6 minutes early.

Set against the rest of the country, DL 432's record is 8 points better than the US average of 77.3%. That gap is worth roughly 79 fewer late arrivals for every thousand flights.

On time

85.2%

Arrivals under 15 minutes late, of 358 completed flights

Avg delay

100 min

Across delayed arrivals only, not all flights

Cancelled

1.65%

National rate is 1.89%

1 hour+ late

5.6%

National rate is 8.3%

These figures cover 364 flights between September 2025 and August 2026. The median arrival is 6 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.

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Schedule

When DL 432 flies

DL 432 flies IAD to SLC without a single fixed slot. Its most common scheduled departure was 07:05, used on 121 of 364 flights, with 07:20 (60 flights) and 07:15 (49 flights) next.

Departs 07:05121 flights33.2%
Departs 07:2060 flights16.5%
Departs 07:1549 flights13.5%

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 07:05 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 432 runs 4 points worse at 85.2%. 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 432 next to IAD to SLC

Every carrier on IAD to SLC combined arrived on time 81.4% of the time across 701 flights, so DL 432 is 4 points ahead of it. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 4 points.

DL 432 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 432thin sample	364	85.2%	100 min	1.65%	A
All Delta Air Lines on IAD–SLCthin sample	364	85.2%	100 min	1.65%	A
All carriers on IAD–SLC	701	81.4%	103 min	1.43%	B
Delta Air Lines, whole network	1,039,517	81.1%	71 min	1.74%	B

Across the year

DL 432 quarter by quarter

DL 432 did not run the same all year. Its best quarter was Jul–Sep 2026 at 95.2% on time and its weakest Oct–Dec 2025 at 75.6%, a swing of 20 points on roughly 73 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 flights93.3%
Oct–Dec 202591 flights75.6%
Jan–Mar 202690 flights77.6%
Apr–Jun 202691 flights92.3%
Jul–Sep 202662 flights95.2%

Scale runs 65% to 100%.

By weekday, DL 432 ranged from 82.7% on Saturday to 88.5% on Wednesday. With about 52 flights behind each day, a spread of 6 points is inside normal variation, so the day you fly is not worth changing for this flight.

Arrival by arrival

How late DL 432 runs when it is late

DL 432 often beats the schedule: 94 of 358 completed flights, 26%, arrived 15 minutes or more early. The 53 late arrivals split 21 under half an hour, 12 between 30 and 60 minutes, and 20 an hour or more.

15+ min early94 flights26.3%
Within 15 min211 flights58.9%
15–29 min late21 flights5.9%
30–59 min late12 flights3.4%
1–2 hours late7 flights2.0%
2+ hours late13 flights3.6%

Scale runs 0% to 100%.

Share of 358 completed flights by arrival against schedule.

8 of 34 late departures made up the time and arrived on time, 24% of them. 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 SLC.

The worst days

Worst days for DL 432

The latest arrival of the period was on 3 February 2026, 13 hours 33 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.

The latest arrivals of DL 432 in the period
Date	Arrived late by	Largest filed cause
3 February 2026	13 hours 33 minutes	Carrier
21 January 2026	7 hours 43 minutes	Carrier
10 November 2025	7 hours 24 minutes	Carrier
20 November 2025	7 hours 15 minutes	Carrier
30 January 2026	6 hours 3 minutes	Carrier

Delay causes

Why DL 432 runs late

Carrier accounts for 82% of the 5,273 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
82%
National Airspace System
15%
Extreme weather
2%

The largest share of delay minutes, 82%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 4,330 of the 5,273 delay minutes reported here. The split is drawn from 5,273 delay minutes reported on DL 432.

Cancellations sit at 1.65% against a national 1.89%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

5.6% 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 1,827 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 364 flights under DL 432 in the data flew IAD 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. 364 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 432

For a booking, read DL 432 as 85.2% on time with 1.65% cancelled over 364 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