Flight number record

DL 937

Delta Air Lines · Atlanta to Tucson

Route: ATL → TUS
Departs: 11:15
Flights: 365
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 937, check with Delta Air Lines.

DL 937 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 9 points better than the national rate of 77.6%. When something does go wrong the average delay runs about 55 minutes. That rests on 365 flights, with a median arrival 5 minutes early.

Set against the rest of the country, DL 937's record is 9 points better than the US average of 77.6%. That gap is worth roughly 90 fewer late arrivals for every thousand flights.

On time

86.6%

Arrivals under 15 minutes late, of 358 completed flights

Avg delay

55 min

Across delayed arrivals only, not all flights

Cancelled

1.64%

National rate is 1.81%

1 hour+ late

3.9%

National rate is 8.1%

These figures cover 365 flights between July 2025 and June 2026. The median arrival is 5 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 937 flies

DL 937 flies ATL to TUS without a single fixed slot. Its most common scheduled departure was 11:15, used on 42 of 365 flights. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 11:1542 flights11.5%

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 11:15 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and DL 937 runs 8 points better at 86.6%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

DL 937 next to ATL to TUS

Every carrier on ATL to TUS combined arrived on time 83.1% of the time across 809 flights, so DL 937 is 4 points ahead of it. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 5 points.

DL 937 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 937	365	86.6%	55 min	1.64%	A
All Delta Air Lines on ATL–TUS	809	83.1%	56 min	1.98%	B
All carriers on ATL–TUS	809	83.1%	56 min	1.98%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 937 quarter by quarter

Quarter by quarter DL 937 held fairly steady: 90.1% in Jul–Sep 2025, 85.7% in Oct–Dec 2025, 80.2% in Jan–Mar 2026 and 90.0% in Apr–Jun 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 202592 flights90.1%
Oct–Dec 202592 flights85.7%
Jan–Mar 202690 flights80.2%
Apr–Jun 202691 flights90.0%

Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, DL 937 ranged from 80.4% on Friday to 92.3% on Thursday. With about 52 flights behind each day, a spread of 12 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why DL 937 runs late

One category carries most of the weight here. Carrier accounts for 45% of the 2,634 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
45%
Late-arriving aircraft
31%
National Airspace System
23%
Extreme weather
1%

The largest share of delay minutes, 45%, 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 1,173 of the 2,634 delay minutes reported here. The split is drawn from 2,634 delay minutes reported on DL 937.

Cancellations sit at 1.64% against a national 1.81%, which is ordinary. Diversions add another 0.27%.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 3.9% 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 1,541 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.

DL 937 is not only a ATL to TUS flight. It also flew TUS to ATL (365 flights, 87.2% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.

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.

Other routes flown as DL 937
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
TUS to ATL	365	87.2%	123 min	1.64%	A

What to do with this

Booking DL 937

For a booking, read DL 937 as 86.6% on time with 1.64% 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures