Airport month record
DENJUN
Denver International in June 2026
- Departures
- 28,634
- Month
- June 2026
- National, same month
- 74.3%
- Carriers
- 9
Historical statistics for June 2026, not live status or a forecast for this year’s June. For today’s conditions at DEN, see live FAA status.
DEN in June draws a C+. About one flight in three arrives at least 15 minutes late, and the typical late arrival is about an hour behind schedule. Build slack into anything you connect to. That rests on 28,634 flights, of which Delta Air Lines flew 1,049 at 81.2% on time.
Delta Air Lines is the most reliable of the six carriers covered here at 81.2% on time across 1,049 flights.
Key figures
On time
67.1%
Arrivals under 15 minutes late, of 28,420 completed departures
Avg delay
64 min
Across delayed arrivals only, not all flights
Cancelled
0.41%
Nationally in June: 1.65%
Whole year
76.6%
DEN across all twelve months
These figures cover 28,634 departures from Denver International in June 2026. On time means an arrival less than 15 minutes after the scheduled gate time, the DOT's threshold, and the national comparison uses every US departure in the same month rather than the whole year.
Against the year
June next to DEN's other months
Against DEN's own year, June ran 10 points worse than the twelve-month rate of 76.6%, which makes it number eleven of twelve months, best first. Cancellations were unusually low for DEN in June, at 0.41% against 0.78% across the year. Either side of it, May ran 76.4% on time and July 69.6%, so a trip moved by a few weeks would have landed in a better stretch.
| Month | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| September 2025 | 26,548 | 79.4% | 54 min | 0.12% | B+ |
| October 2025 | 27,763 | 80.8% | 52 min | 0.13% | B+ |
| November 2025 | 25,280 | 84.7% | 62 min | 1.44% | B |
| December 2025 | 26,026 | 74.3% | 68 min | 0.64% | C+ |
| January 2026 | 24,484 | 82.3% | 60 min | 1.69% | B |
| February 2026 | 23,046 | 82.4% | 69 min | 0.88% | B+ |
| March 2026 | 27,089 | 76.8% | 72 min | 1.50% | B |
| April 2026 | 25,345 | 82.5% | 56 min | 0.27% | B+ |
| May 2026 | 27,406 | 76.4% | 58 min | 0.28% | B+ |
| June 2026 (this page) | 28,634 | 67.1% | 64 min | 0.41% | C+ |
| July 2026 | 29,503 | 69.6% | 73 min | 0.81% | C+ |
| August 2026 | 28,557 | 67.1% | 80 min | 1.27% | C |
Departure window
The best time of day to leave DEN in June
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 38 points, against 27 points between the best and worst carrier.
- 5am–8am2,748 flights88.3%
- 8am–11am5,537 flights82.0%
- 11am–2pm5,926 flights71.1%
- 2pm–5pm4,463 flights64.4%
- 5pm–8pm6,156 flights50.0%
- 8pm–5am3,804 flights54.7%
Scale runs 40% to 95%.
The 5pm–8pm window is where this operation falls apart: 50.0% on time, against 88.3% for the 5am–8am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 5pm–8pm window is the busiest, with 6,156 flights scheduled in it.
Across the week, Tuesday is the strongest day at 73.1% on time and Sunday the weakest at 59.0%, a spread of 14 points.
Carrier by carrier
Which airlines ran best at DEN in June
The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 81.2% of the time; Southwest Airlines manages 54.3%. Sample sizes sit next to every figure, because a two-point gap across 8,029 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| United Airlines | 9,694 | 70.6% | 64 min | 0.11% | C+ |
| Southwest Airlines | 8,029 | 54.3% | 55 min | 0.46% | F+ |
| SkyWest Airlines | 6,396 | 72.8% | 73 min | 0.20% | C+ |
| Frontier Airlines | 2,150 | 74.6% | 71 min | 0.70% | C+ |
| Delta Air Lines | 1,049 | 81.2% | 71 min | 0.86% | B+ |
| American Airlines | 805 | 66.2% | 99 min | 2.73% | C |
| Alaska Airlinesthin sample | 311 | 76.4% | 66 min | 1.61% | B |
| JetBlue Airwaysthin sample | 137 | 59.7% | 86 min | 2.19% | D |
| Allegiant Airthin sample | 62 | 72.1% | 81 min | 1.61% | C |
The spread between Delta and Southwest is 27 points, wide enough that it should decide the booking. On a hundred trips that is 27 more arrivals inside the on-time window.
Route by route
Busiest routes out of DEN in June
| Route | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DEN to PHX · Phoenix | 683 | 66.1% | 67 min | 0.73% | C+ |
| DEN to SLC · Salt Lake City | 657 | 68.8% | 56 min | 0.15% | C+ |
| DEN to LAX · Los Angeles | 654 | 66.5% | 65 min | 0.46% | C+ |
| DEN to SEA · Seattle | 634 | 69.6% | 62 min | 1.26% | C |
| DEN to LAS · Las Vegas | 593 | 65.4% | 66 min | 0.84% | C+ |
| DEN to MSP · Minneapolis | 548 | 70.5% | 63 min | 0.55% | C+ |
| DEN to DFW · Dallas-Fort Worth | 539 | 63.1% | 88 min | 2.97% | D |
| DEN to ORD · Chicago | 537 | 66.5% | 97 min | 1.12% | C |
| DEN to SAN · San Diego | 525 | 65.0% | 54 min | 0.38% | C+ |
| DEN to ATL · Atlanta | 516 | 73.2% | 59 min | 0.19% | C+ |
| DEN to AUS · Austin | 502 | 64.5% | 57 min | 0.40% | D+ |
| DEN to SFO · San Francisco | 494 | 39.4% | 63 min | 0.40% | F+ |
| DEN to COS · Colorado Springs | 436 | 68.9% | 64 min | 0.23% | C+ |
| DEN to PDX · Portland | 435 | 60.4% | 51 min | 0.23% | D+ |
| DEN to IAH · Houston | 431 | 68.6% | 59 min | 0.00% | C+ |
| DEN to MCO · Orlando | 420 | 69.3% | 66 min | 0.24% | C+ |
| DEN to MCI · Kansas City | 419 | 68.3% | 64 min | 0.48% | C+ |
| DEN to LGA · New York | 394 | 61.3% | 62 min | 1.02% | D |
| DEN to SMF · Sacramento | 376 | 59.0% | 55 min | 0.00% | D+ |
| DEN to BOS · Boston | 374 | 66.4% | 70 min | 0.27% | C+ |
| DEN to STL · St. Louisthin sample | 358 | 69.3% | 53 min | 1.40% | C |
| DEN to BNA · Nashvillethin sample | 340 | 63.7% | 58 min | 0.29% | D+ |
| DEN to SNA · Santa Anathin sample | 327 | 66.7% | 45 min | 0.00% | C+ |
| DEN to OMA · Omahathin sample | 324 | 65.1% | 60 min | 0.00% | C+ |
| DEN to PHL · Philadelphiathin sample | 316 | 67.5% | 100 min | 0.63% | C+ |
Delay causes
What held DEN up in June
Late-arriving aircraft accounts for 45% of the 597,000 delay minutes carriers reported here, and the remaining four split what is left.
- 45%Late-arriving aircraft
- 30%Carrier
- 20%National Airspace System
- 6%Extreme weather
- 0%Security
45% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 597,000 reported delay minutes here, that single category outweighs weather by 8 to one. The split is drawn from 596,740 reported delay minutes.
Cancellations are rare at 0.41%, below the national 1.65% 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.
11.3% of arrivals land a full hour or more behind schedule, against 9.7% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
What to do with this
Flying from DEN in June
For a June trip through DEN: plan on this being one of the airport's harder months. The 5am–8am departures held up best at 88.3% on time, and with 11.3% of arrivals an hour or more late, a connection here deserves more slack than the same trip in November would.
Related
Where to go next
- Denver International (DEN), the whole year
- DEN in September79.4%
- DEN in October80.8%
- DEN in November84.7%
- DEN in December74.3%
- DEN in January82.3%
- DEN in February82.4%
- DEN in March76.8%
- DEN in April82.5%
- DEN in May76.4%
- DEN in July69.6%
- DEN in August67.1%
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.