Denver is generally safe, but like any city, be aware of your surroundings in downtown areas.

You need a car if you plan to explore the mountains, but not for downtown.

How far is the airport?

The airport is about 25 miles from downtown Denver.

What is the best way to get to the mountains?

Renting a car is the most flexible way to reach the ski resorts.

Is the A-Line train reliable?

Yes, it is a very efficient way to travel from the airport to Union Station.

Portage

Denver

Flight Driving

Portage to Denver

Updated: 28 May 2026

The journey from Portage to Denver spans roughly 1,600 kilometers. Driving takes about 15 hours via I-80 W, crossing the flat plains of Illinois, Iowa, and Nebraska. Flying from Chicago O'Hare (ORD) to Denver International (DEN) is a popular alternative, taking just over 2 hours. Denver serves as the gateway to the Rocky Mountains, and the altitude change is significant. Prepare for rapid weather shifts once you reach the foothills.

Total Distance: 1,600 km driving distance; 1,500 km air distance.

Fastest Way

Flight from Chicago to Denver takes 2.5 hours.

Cheapest Way

Driving is the most economical for a group of travelers.

Compare Portage to Denver Routes

	Flight Direct	Driving Direct
Duration	2 hours 30 mins	15 hours
Avg Price	$150 - $350	$250 - $350 in fuel
Operator	United Airlines	Personal Vehicle
Route	ORD to DEN	I-80 W to I-76 W.
Tip	Denver International is far from downtown; use the A-Line train to get to the city.	The drive through Nebraska is very flat; watch your speed as police are active.

Travel Tips

Altitude
Denver is a mile high; drink twice as much water as usual to avoid altitude sickness.
Weather
Colorado weather changes rapidly; always dress in layers.
Transportation
The RTD light rail system is excellent for getting around the metro area.
Sun Protection
The sun is much stronger at high altitudes; wear sunscreen daily.
Driving
If heading into the mountains, ensure your car has good tires for potential snow.

Safety Tips

Altitude Sickness
Take it easy for the first 24 hours to allow your body to acclimate.
Mountain Driving
Use lower gears when descending steep mountain passes to save your brakes.
Emergency
Keep a winter emergency kit in your car if traveling between October and May.
Hydration
Carry a water bottle everywhere; the air is very dry.