Denver is the capital of Colorado, set where the Great Plains meet the Rocky Mountain foothills. Its main airport is a large hub about 37 km from downtown, connected by a direct commuter rail line. The city has dry, sunny weather with warm summers and cold but often sunny winters, and many visitors use it as a base for trips into the mountains.
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23 miles (37 km) from the city centre. 82.4 million passengers in 2024
| How | Route | Time | Cost |
|---|---|---|---|
| Train | RTD A Line to Denver Union Station | about 37m | $10 Airport Day Pass |
No passport or visa is needed for domestic travel, but a REAL ID-compliant license or another accepted ID is required to fly within the US.
Since May 7, 2025, air travelers 18 and older need a REAL ID-compliant driver's license (marked with a star), a valid US passport, or another TSA-accepted ID such as a military ID or an enhanced driver's license. Children under 18 flying with a companion do not need ID.
Summer and early autumn bring the warmest, sunniest weather, with July and August highs near 88 to 90 F. Measurable snow can fall from mid-October to late April, so winter trips suit skiers more than sightseers.
Busiest: Jun–Aug. Quieter shoulder season: May, Sep–Oct.
| Month | Avg high | Avg low |
|---|---|---|
| Jan | 44.6°F (7°C) | 18.7°F (-7°C) |
| Feb | 45.7°F (8°C) | 19.7°F (-7°C) |
| Mar | 55.7°F (13°C) | 27.5°F (-2°C) |
| Apr | 61.7°F (17°C) | 33.9°F (1°C) |
| May | 71.2°F (22°C) | 43.6°F (6°C) |
| Jun | 83.4°F (29°C) | 53°F (12°C) |
| Jul | 89.9°F (32°C) | 60.2°F (16°C) |
| Aug | 87.5°F (31°C) | 58.3°F (15°C) |
| Sep | 79.6°F (26°C) | 50°F (10°C) |
| Oct | 65.3°F (19°C) | 37°F (3°C) |
| Nov | 52.9°F (12°C) | 26°F (-3°C) |
| Dec | 44°F (7°C) | 18.4°F (-8°C) |
Denver is served by Denver International Airport (DEN). Denver International Airport handled about 82.4 million passengers in 2024.
No passport or visa is needed for domestic travel, but a REAL ID-compliant license or another accepted ID is required to fly within the US. Since May 7, 2025, air travelers 18 and older need a REAL ID-compliant driver's license (marked with a star), a valid US passport, or another TSA-accepted ID such as a military ID or an enhanced driver's license. Children under 18 flying with a companion do not need ID.
Summer and early autumn bring the warmest, sunniest weather, with July and August highs near 88 to 90 F. Measurable snow can fall from mid-October to late April, so winter trips suit skiers more than sightseers.
RTD A Line to Denver Union Station, about 37 minutes, $10 Airport Day Pass.
Among the cities we cover, Atlanta (about 0m), Boston (about 0m), Charlotte (about 0m), Chicago (about 0m), Dallas (about 0m), Detroit (about 0m), Houston (about 0m), Los Angeles (about 0m), Miami (about 0m), Minneapolis–Saint Paul (about 0m), New York (about 0m), Philadelphia (about 0m), Phoenix (about 0m), San Francisco (about 0m), Seattle (about 0m) and Washington, D.C. (about 0m) have nonstop service to Denver as of October 2026.
Denver uses the US dollar (USD).
Flying out of Denver? See destinations from Denver
Information checked in October 2026. Schedules, fares and entry rules change, so confirm with the airline or the official source before you travel.