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DIA is serviced by most major airline carriers, including non-stop flights between Denver and London, and Denver and Frankfurt. Travel time from DIA to Boulder is approximately 45 minutes.
| Airline | Phone Number |
| Air Canada | 888.247.2262 |
| America West | 800.235.9292 |
| American | 800.433.7300 |
| ATA | 800.435.9282 |
| British Airways | 800.247.9297 |
| Continental | 800.525.0280 |
| Delta | 800.221.1212 |
| Frontier (Based in Denver) | 800.432.1359 |
| Greeley, Colorado | 48.1 miles |
| Mexicana | 800.531.7921 |
| Midwest Express | 800.452.2022 |
| Northwest | 800.225.2525 |
| TWA | 800.221.2000 |
| United (Denver is a Hub City) | 800.241.6522 |
| US Air | 800.428.4322 |
| Vanguard | 800.826.4827 |
Exit DIA on Peña Boulevard. Continue until you reach I-70 west. Take I-70 west and keep right at the fork to continue onto I-270 (following signs for Fort Collins/Boulder). Continue on I-270 north, which will become U.S. Hwy 36 west and will take you straight into Boulder.
or
Take the toll road exit, E-470 north from Peña Boulevard to the Northwest Parkway towards Broomfield. Take the exit for Hwy 36 and continue west on Hwy. 36 into Boulder. Please be aware this route has tolls, but can save time at peak travel hours.
Boulder Municipal Airport is a small hub serving business, private, recreational and emergency aviation services to the City of Boulder and surrounding communities.
Rocky Mountain Metropolitan Airport is another smaller, regional airport situated between Boulder and Denver, just off Hwy. 36.
