Duluth International in December 2025

61.6%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 December 2025, reporting carriers scheduled 172 domestic departures from Duluth International (DLH). 61.6% left less than 15 minutes late and 61.0% reached their destination on time; 5.2% were cancelled.

Nationally that month, 72.0% of flights departed on time and 71.9% arrived on time, so DLH departures were 10.4 points below the national departure figure.

A year earlier, in December 2024, the airport had 170 departures with 69.4% leaving on time: a change of −7.8 points, with flights up 1%.

Flights arriving at DLH that month were on time 50.3% of the time (171 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 51%, late-arriving aircraft 24% and national aviation system 13%.

On time 61.0%
Arrived 15+ minutes late 33.7%
Cancelled 5.2%
Diverted 0.0%

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

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

Measure	Dec 2025	Dec 2024	DLH, 12 months to Jul 2026	All reported flights, Dec 2025
Departed on time	61.6%	69.4%	76.9%	72.0%
Arrived on time	61.0%	71.2%	72.7%	71.9%
Cancelled	5.2%	3.5%	3.6%	1.5%
Average departure delay (late minutes only)	50.7 min	27.7 min	24.5 min	21.2 min
Scheduled departures a day	6	6	7	19,410
Scheduled departures	172	170	2,429	582,304

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	172	100%	61.0%	41.8 min	5.2%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
DLH–MSP	Duluth to Minneapolis	109	66.1%	25.8 min	3.7%
DLH–ORD	Duluth to Chicago	63	52.4%	70.8 min	7.9%

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), December 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Dec 2025	Minutes
Air carrier	51.0%	33.3%	4,176
Late-arriving aircraft	23.5%	41.1%	1,923
National Aviation System	13.1%	19.1%	1,075
Extreme weather	12.3%	6.4%	1,007
Security	0.0%	0.2%	0

8,181 delay minutes on 58 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 December 2025?

61.6% of 172 scheduled domestic departures left less than 15 minutes late, and 61.0% reached their destination on time. The national figures that month were 72.0% and 71.9%.

How does that compare with a year earlier?

In December 2024, 69.4% of 170 departures left on time and 3.5% were cancelled, against 61.6% and 5.2% in December 2025.

Provenance

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