Duluth International in August 2025

76.1%departed on time

BTS: A flight is counted as on time if it arrived less than 15 minutes after its scheduled time. Only carriers with at least 0.5 percent of domestic scheduled passenger revenue report.

In August 2025, reporting carriers scheduled 197 domestic departures from Duluth International (DLH). 76.1% left less than 15 minutes late and 72.6% reached their destination on time; 1.5% were cancelled.

Nationally that month, 76.8% of flights departed on time and 76.3% arrived on time, so DLH departures were 0.7 points below the national departure figure.

A year earlier, in August 2024, the airport had 236 departures with 80.5% leaving on time: a change of −4.4 points, with flights down 17%.

Flights arriving at DLH that month were on time 74.7% of the time (198 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 70%, late-arriving aircraft 15% and national aviation system 12%.

On time 72.6%
Arrived 15+ minutes late 25.9%
Cancelled 1.5%
Diverted 0.0%

Every scheduled departure from DLH in August 2025, judged by arrival at the destination.

August 2025 against a year earlier, the airport's year and the nation

Measure	Aug 2025	Aug 2024	DLH, 12 months to Jul 2026	All reported flights, Aug 2025
Departed on time	76.1%	80.5%	76.9%	76.8%
Arrived on time	72.6%	74.6%	72.7%	76.3%
Cancelled	1.5%	0.4%	3.6%	1.1%
Average departure delay (late minutes only)	20.4 min	12.9 min	24.5 min	17.6 min
Scheduled departures a day	7	8	7	20,079
Scheduled departures	197	236	2,429	602,378

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	195	99%	72.3%	12.5 min	1.5%
DL Delta Air Lines	2	1%	100.0%	-9.5 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
DLH–ORD	Duluth to Chicago	106	64.2%	14.8 min	2.8%
DLH–MSP	Duluth to Minneapolis	91	82.4%	9.4 min	0.0%

By scheduled departure hour

On-time share:under 62%6270768288% and over

Share of departures that left less than 15 minutes late, by scheduled hour (local time), August 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Aug 2025	Minutes
Air carrier	70.4%	33.1%	2,720
Late-arriving aircraft	14.5%	40.5%	559
National Aviation System	12.2%	19.2%	471
Extreme weather	3.0%	7.0%	116
Security	0.0%	0.1%	0

3,866 delay minutes on 51 flights that arrived 15 or more minutes late and carried a cause report. Carriers assign the categories; see what each category means.

Questions and answers

How many flights left DLH on time in August 2025?

76.1% of 197 scheduled domestic departures left less than 15 minutes late, and 72.6% reached their destination on time. The national figures that month were 76.8% and 76.3%.

How does that compare with a year earlier?

In August 2024, 80.5% of 236 departures left on time and 0.4% were cancelled, against 76.1% and 1.5% in August 2025.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for August 2025; public domain. Domestic scheduled flights by reporting carriers, totals and averages only. The site's data runs through July 2026. Full record for DLH · methodology · corrections.