Route reliability record

DEN→MSP

Denver to Minneapolis

Flights: 5,835
Period: June 2025 to May 2026
Distance: 680 mi
Carriers: 5

This route lands a B+, level with the national rate of 77.4%. Roughly one flight in four arrive 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 5,835 flights, of which Delta Air Lines flew 1,805 at 81.3% on time.

Delta Air Lines is the most reliable of the four carriers covered here at 81.3% on time across 1,805 flights.

On time

77.6%

Arrivals under 15 minutes late, of 5,789 completed flights

Avg delay

65 min

Across delayed arrivals only, not all flights

Cancelled

0.69%

National rate is 1.80%

Best carrier

Delta

81.3% on time across 1,805 flights

These figures cover 5,835 flights between June 2025 and May 2026. Beyond the headline rate, 8.0% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Carrier by carrier

Which airline is most reliable on DEN to MSP

The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 81.3% of the time; Frontier Airlines manages 70.3%. Sample sizes sit next to every figure, because a two-point gap across 607 flights means less than a ten-point one.

On-time performance by carrier on DEN to MSP
Airline	Flights	On time	Avg delay	Cancelled	Grade
SkyWest Airlinesthin sample	245	88.7%	78 min	2.45%	A
Delta Air Lines	1,805	81.3%	74 min	0.83%	B+
United Airlines	1,434	79.9%	70 min	0.42%	B+
Southwest Airlines	1,744	73.0%	54 min	0.52%	C+
Frontier Airlines	607	70.3%	65 min	0.66%	C+

Delta leads Frontier by 11 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.

Departure window

The best time of day to leave

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 25 points, against 11 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am745 flights91.7%
8am–11am1,090 flights87.3%
11am–2pm827 flights78.9%
2pm–5pm1,202 flights77.4%
5pm–8pm1,222 flights66.7%
8pm–5am749 flights66.3%

Scale runs 60% to 95%. Rows with fewer than 30 flights show a dash.

Book the early departure. Flights leaving between 5am–8am arrive on time 91.7% of the time, against 66.3% for the overnight window. That is 25 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on.

Across the year

When delays peak on this route

This route's year swings by 25 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.

Darker means more delays. Figures are on-time percentages.April best, July worst

July is the worst month at 64.6% on time, 25 points below April, the best at 89.1%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck.

Across the week, Tuesday is the strongest day at 79.3% on time and Friday the weakest at 74.9%. 4 points is a smaller lever than departure hour, but it is free.

Delay causes

Why this route gets delayed

One category carries most of the weight here. Late-arriving aircraft accounts for 53% of the 84,000 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.

Late-arriving aircraft
53%
Carrier
32%
National Airspace System
13%
Extreme weather
2%
Security
0%

53% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 84,000 reported delay minutes here, that single category outweighs weather by 22 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit.

The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 91.7% on time here.

Cancellations are rare at 0.69%, below the national 1.80% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.

Connections and stage length

What a delay here actually costs

8.0% of arrivals land an hour or more late, close to the national 8.2%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route are the about an hour kind, which a normal layover absorbs.

The 680 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 return leg runs 77.5% on time across 5,835 flights, within half a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.

The sample behind these figures is 5,835 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.

What to do with this

Booking this route

Put together: the calendar is the biggest lever here, not the carrier or the hour. April runs 89.1% on time and July 64.6%, a swing of 25 points. If the dates move at all, move them out of July before you think about anything else.

Common questions

DEN to MSP questions

How often is DEN to MSP delayed?

Roughly one flight in four arrive at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 22.4% of the 5,835 flights in this analysis, against 22.6% nationally. Delayed flights are late by about an hour on average.

Which airline is most reliable on DEN to MSP?

Delta Air Lines leads at 81.3% on time across 1,805 flights. Frontier Airlines is at the other end on 70.3%, a gap of 11 points. Sample size matters as much as the percentage: a rate built from a few hundred flights moves around far more than one built from ten thousand.

What time of day has the fewest delays on DEN to MSP?

The 5am–8am departure window is the strongest at 91.7% on time. The 8pm–5am window is the weakest at 66.3%, 25 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.

How bad are July delays on DEN to MSP?

July is the weakest month at 64.6% on time, compared with 89.1% in April. Across the year that is 25 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.

Where to go next

Direction matters. DEN to MSP and MSP to DEN are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.

Source: US DOT Bureau of Transportation Statistics, on-time performance data, June 2025 to May 2026. Updated monthly. How this data is collected.

Key figures