Duluth International in September 2025

83.3%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 September 2025, reporting carriers scheduled 216 domestic departures from Duluth International (DLH). 83.3% left less than 15 minutes late and 78.2% reached their destination on time; 0.9% were cancelled.

Nationally that month, 83.1% of flights departed on time and 82.8% arrived on time, so DLH departures were level with the national departure figure.

A year earlier, in September 2024, the airport had 230 departures with 90.4% leaving on time: a change of −7.1 points, with flights down 6%.

Flights arriving at DLH that month were on time 76.0% of the time (217 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 45%, extreme weather 36% and national aviation system 14%.

On time 78.2%
Arrived 15+ minutes late 20.4%
Cancelled 0.9%
Diverted 0.5%

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

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

Measure	Sep 2025	Sep 2024	DLH, 12 months to Jul 2026	All reported flights, Sep 2025
Departed on time	83.3%	90.4%	76.9%	83.1%
Arrived on time	78.2%	90.9%	72.7%	82.8%
Cancelled	0.9%	0.4%	3.6%	0.5%
Average departure delay (late minutes only)	15.5 min	6.4 min	24.5 min	12.2 min
Scheduled departures a day	7	8	7	18,748
Scheduled departures	216	230	2,429	562,439

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	216	100%	78.2%	6.1 min	0.9%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
DLH–ORD	Duluth to Chicago	119	75.6%	13.2 min	1.7%
DLH–MSP	Duluth to Minneapolis	97	81.4%	-2.3 min	0.0%

By scheduled departure hour

100

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

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

Delay causes

BTS cause category	Share of delay minutes	National, Sep 2025	Minutes
Air carrier	44.7%	34.3%	1,509
Late-arriving aircraft	5.4%	37.4%	184
National Aviation System	14.4%	22.6%	486
Extreme weather	35.5%	5.6%	1,198
Security	0.0%	0.1%	0

3,377 delay minutes on 44 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 September 2025?

83.3% of 216 scheduled domestic departures left less than 15 minutes late, and 78.2% reached their destination on time. The national figures that month were 83.1% and 82.8%.

How does that compare with a year earlier?

In September 2024, 90.4% of 230 departures left on time and 0.4% were cancelled, against 83.3% and 0.9% in September 2025.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for September 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.