Flight number record

DL 3127

Delta Air Lines · Melbourne to Atlanta

Route: MLB → ATL
Departs: 14:29
Flights: 364
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 3127, check with Delta Air Lines.

DL 3127 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 a little over an hour on average. That is a workable record, not a spotless one. That rests on 364 flights, with a median arrival 11 minutes early.

On time

81.2%

Arrivals under 15 minutes late, of 362 completed flights

Avg delay

81 min

Across delayed arrivals only, not all flights

Cancelled

0.55%

National rate is 1.81%

1 hour+ late

7.7%

National rate is 8.1%

These figures cover 364 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 3127 flies

DL 3127 flies MLB to ATL without a single fixed slot. Its most common scheduled departure was 14:29, used on 63 of 364 flights, with 14:48 (41 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 14:2963 flights17.3%
Departs 14:4841 flights11.3%

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 14:29 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and DL 3127 runs 9 points better at 81.2%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

DL 3127 next to MLB to ATL

Every carrier on MLB to ATL combined arrived on time 87.9% of the time across 1,448 flights, so DL 3127 is 7 points behind it. Across its whole network Delta Air Lines managed 81.6%, close to this flight's figure.

DL 3127 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 3127thin sample	364	81.2%	81 min	0.55%	B+
All Delta Air Lines on MLB–ATL	1,448	87.9%	78 min	1.38%	A
All carriers on MLB–ATL	1,448	87.9%	78 min	1.38%	A
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 3127 quarter by quarter

DL 3127 did not run the same all year. Its best quarter was Jan–Mar 2026 at 86.4% on time and its weakest Jul–Sep 2025 at 73.9%, a swing of 13 points on roughly 91 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 flights73.9%
Oct–Dec 202591 flights82.4%
Jan–Mar 202690 flights86.4%
Apr–Jun 202691 flights82.4%

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

By weekday, DL 3127 did best on Thursday at 88.2% on time and worst on Sunday at 67.3%. Each day rests on about 52 flights, so a gap of 21 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 3127 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 47% of the 5,489 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.

Late-arriving aircraft
47%
Carrier
29%
National Airspace System
16%
Extreme weather
8%

47% 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 5,489 reported delay minutes here, that single category outweighs weather by 6 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 5,489 delay minutes reported on DL 3127.

Cancellations are rare at 0.55%, below the national 1.81% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.

Connections and routes

What a delay on this flight costs

7.7% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over an hour, which a normal layover absorbs.

DL 3127 is not only a MLB to ATL flight. It also flew ATL to MLB (364 flights, 84.8% 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. 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.

Other routes flown as DL 3127
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
ATL to MLBthin sample	364	84.8%	54 min	0.27%	B+

What to do with this

Booking DL 3127

For a booking, DL 3127 is one of the weaker ways to fly MLB to ATL: 7 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.

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