Flight number record

DL 1033

Delta Air Lines · Raleigh to Boston

Route: RDU → BOS
Departs: 13:10
Flights: 263
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1033, check with Delta Air Lines.

DL 1033 sits in the middle of the pack with a C. Close to three flights in four arrive on time by the DOT's definition, 3 points worse than the national rate of 77.3%. The late ones land an hour and a half behind schedule. That rests on 263 flights, with a median arrival 7 minutes early.

On time

74.5%

Arrivals under 15 minutes late, of 259 completed flights

Avg delay

84 min

Across delayed arrivals only, not all flights

Cancelled

1.52%

National rate is 1.89%

1 hour+ late

12.0%

National rate is 8.3%

These figures cover 263 flights between September 2025 and August 2026. Beyond the headline rate, 12.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.

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Schedule

When DL 1033 flies

DL 1033 flies RDU to BOS without a single fixed slot. Its most common scheduled departure was 13:10, used on 62 of 263 flights, with 12:59 (54 flights) and 12:55 (45 flights) next.

Departs 13:1062 flights23.6%
Departs 12:5954 flights20.5%
Departs 12:5545 flights17.1%

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 13:10 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and DL 1033 runs 4 points worse at 74.5%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

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Against the route

DL 1033 next to RDU to BOS

Every carrier on RDU to BOS combined arrived on time 78.5% of the time across 2,847 flights, so DL 1033 is 4 points behind it. Delta flew 1,435 flights on the same city pair under all its flight numbers, including this one, and those ran 79.6% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 7 points.

DL 1033 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1033thin sample	263	74.5%	84 min	1.52%	C
All Delta Air Lines on RDU–BOS	1,435	79.6%	89 min	2.72%	B
All carriers on RDU–BOS	2,847	78.5%	83 min	2.95%	B
Delta Air Lines, whole network	1,039,517	81.1%	71 min	1.74%	B

Across the year

DL 1033 quarter by quarter

DL 1033 did not run the same all year. Its best quarter was Jan–Mar 2026 at 83.3% on time and its weakest Oct–Dec 2025 at 65.2%, a swing of 18 points on roughly 66 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 202526 flights—
Oct–Dec 202569 flights65.2%
Jan–Mar 202661 flights83.3%
Apr–Jun 202667 flights77.3%
Jul–Sep 202640 flights79.5%

Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1033 did best on Friday at 86.7% on time and worst on Monday at 62.5%. Each day rests on about 38 flights, so a gap of 24 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late DL 1033 runs when it is late

DL 1033 often beats the schedule: 84 of 259 completed flights, 32%, arrived 15 minutes or more early. The 66 late arrivals split 15 under half an hour, 20 between 30 and 60 minutes, and 31 an hour or more.

15+ min early84 flights32.4%
Within 15 min109 flights42.1%
15–29 min late15 flights5.8%
30–59 min late20 flights7.7%
1–2 hours late18 flights6.9%
2+ hours late13 flights5.0%

Scale runs 0% to 100%.

Share of 259 completed flights by arrival against schedule.

Time lost at the gate mostly stays lost. Of 63 departures that left 15 minutes late or more, only 4 made it up before arrival. 7 flights left on time and still arrived late.

The worst days

Worst days for DL 1033

The latest arrival of the period was on 17 November 2025, 6 hours 31 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.

The latest arrivals of DL 1033 in the period
Date	Arrived late by	Largest filed cause
17 November 2025	6 hours 31 minutes	Late-arriving aircraft
4 November 2025	6 hours 16 minutes	Late-arriving aircraft
11 September 2025	6 hours 1 minute	Late-arriving aircraft
6 September 2025	5 hours 44 minutes	National Airspace System
14 December 2025	4 hours 15 minutes	Carrier

Delay causes

Why DL 1033 runs late

National Airspace System accounts for 47% of the 5,540 delay minutes carriers reported here, and the remaining four split what is left.

National Airspace System
47%
Late-arriving aircraft
41%
Carrier
12%

41% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 5,540 reported delay minutes here, that single category outweighs weather by 41 to one. The split is drawn from 5,540 delay minutes reported on DL 1033.

Cancellations sit at 1.52% against a national 1.89%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

12.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.

The 612 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.

The same number turns up on three other city pairs in the data, including HOU to ATL (16), ATL to HOU (16) and ATL to MSP (1), but none flew often enough under DL 1033 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to RDU to BOS only.

One caution: this is a thin sample. 263 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 1033

For a booking, DL 1033 is a flight to put a long connection behind. 12.0% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.

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