Flight number record

DL 1398

Delta Air Lines · Boston to New Orleans

Route: BOS → MSY
Departs: 11:10
Flights: 364
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1398, check with Delta Air Lines.

DL 1398 lands a B, 6 points better than the national rate of 77.6%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 364 flights, with a median arrival 8 minutes early.

Set against the rest of the country, DL 1398's record is 6 points better than the US average of 77.6%. That gap is worth roughly 63 fewer late arrivals for every thousand flights.

On time

83.9%

Arrivals under 15 minutes late, of 355 completed flights

Avg delay

60 min

Across delayed arrivals only, not all flights

Cancelled

2.20%

National rate is 1.81%

1 hour+ late

3.4%

National rate is 8.1%

These figures cover 364 flights between July 2025 and June 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.

Schedule

When DL 1398 flies

DL 1398 flies BOS to MSY without a single fixed slot. Its most common scheduled departure was 11:10, used on 90 of 364 flights, with 11:20 (73 flights) and 11:07 (46 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 11:1090 flights24.7%
Departs 11:2073 flights20.1%
Departs 11:0746 flights12.6%

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 11:10 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and DL 1398 runs 5 points better at 83.9%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

DL 1398 next to BOS to MSY

Every carrier on BOS to MSY combined arrived on time 76.6% of the time across 855 flights, so DL 1398 is 7 points ahead of it. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 2 points.

DL 1398 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1398thin sample	364	83.9%	60 min	2.20%	B
All Delta Air Lines on BOS–MSY	374	84.1%	59 min	2.14%	B
All carriers on BOS–MSY	855	76.6%	76 min	1.52%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 1398 quarter by quarter

Quarter by quarter DL 1398 held fairly steady: 85.7% in Jul–Sep 2025, 82.0% in Oct–Dec 2025, 81.0% in Jan–Mar 2026 and 86.8% in Apr–Jun 2026. A spread of 6 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights85.7%
Oct–Dec 202591 flights82.0%
Jan–Mar 202690 flights81.0%
Apr–Jun 202691 flights86.8%

Scale runs 75% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1398 ranged from 80.4% on Thursday to 90.0% on Sunday. With about 52 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why DL 1398 runs late

One category carries most of the weight here. Carrier accounts for 45% of the 3,417 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%
National Airspace System
29%
Late-arriving aircraft
25%
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 1,544 of the 3,417 delay minutes reported here. The split is drawn from 3,417 delay minutes reported on DL 1398.

Cancellations sit at 2.20% 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 3.4% 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 1,367 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

The same number turns up on one other city pair in the data, including MSY to BOS (195), but none flew often enough under DL 1398 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to BOS to MSY only.

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 1398

For a booking, read DL 1398 as 83.9% on time with 2.20% 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures