Drive or Fly: Aspen, CO to Castle Rock, CO?

Side-by-side comparison of driving versus flying for this route. Costs, time, and trade-offs at a glance.

Driving wins

Medium

No scheduled commercial flights found for ASE–DEN. At 184 miles, driving is the only practical option.

Passengers:

Vehicle:

Drive

Door to Door

4h 38m

Distance

184.7 mi

Total Cost

$76

CO2

75 kg

Cost Breakdown

Diesel$41

Hotel (1 room, 0 nights) $0

Meals (1 pax, 1 day) $35

+ No luggage restrictions or TSA lines

+ Comfortable one-day drive

+ Stop anywhere along the route

+ Have your own car at the destination

+ Likely faster door-to-door than flying

− Wear and tear on vehicle

− Fuel price fluctuations

Plan the drive

Fly

Door to Door

3h 16m

13m in the air

Air Distance

106 mi

Total Cost

$124

CO2

27 kg

Door-to-Door Timeline

Aspen, CO → ASE 10m

Check-in & Security 90m

Flight 13m

Arrival & Baggage 30m

DEN → Castle Rock, CO 53m

Cost Breakdown

Ticket (1 pax @ $124) $124

Airports

Aspen, CO ASE — Aspen-Pitkin County Airport (Sardy Field) 4 mi, ~10m drive

Castle Rock, CO DEN — Denver International Airport 35 mi, ~53m drive

No scheduled flights found

No commercial flights between ASE and DEN. Flight estimates above are theoretical.

+ Less physical fatigue

+ Predictable arrival time

− Airport security and check-in overhead

− No scheduled commercial flights found for this route

− Luggage fees and restrictions

− Less flexibility for stops along the way

Train

Amtrak

Door to Door

9h 1m

6h 45m on rail

Total Cost

$25

CO2

7 kg

Route

California Zephyr

Door-to-Door Timeline

Aspen, CO → Glenwood Springs 55m

Boarding 30m

Train ride 405m

Arrival 10m

Denver → Castle Rock, CO 41m

Cost Breakdown

Ticket (1 pax @ $25) $25

Estimated based on distance. Check amtrak.com for current prices.

Stations

From Glenwood Springs 37 mi, ~55m drive

To Denver 27 mi, ~41m drive

Service

Direct

Frequency

~1/week

+ Spacious seating with legroom and power outlets

+ Walk around freely during the trip

+ No driving fatigue — relax or work en route

+ Much lower carbon footprint than driving or flying

− Limited schedule — about 1 trips per week

− Amtrak delays can be unpredictable

− Need transportation to/from station

− Less flexibility than driving

Bus

FlixBus

Door to Door

5h 54m

3h 50m on road

Total Cost

$14

CO2

7 kg

Route

Greyhound US1200

Door-to-Door Timeline

Aspen, CO → Glenwood Springs (W Glenwood Mall) (GWS6) 58m

Boarding 15m

Bus ride 230m

Arrival 10m

Denver Union Station Bus Concourse (DEN6) → Castle Rock, CO 41m

Cost Breakdown

Ticket (1 pax @ $14) $14

Estimated based on distance. Check flixbus.com for current prices.

Stations

From GWS6 — Glenwood Springs (W Glenwood Mall) 39 mi, ~58m drive

To DEN6 — Denver Union Station Bus Concourse 27 mi, ~41m drive

Service

Direct

Frequency

~7/week

+ Usually the cheapest option

+ Wi-Fi and power outlets on board

+ No driving fatigue — relax or work en route

+ Much lower carbon footprint than driving or flying

− Limited schedule — about 7 trips per week

− Travel time longer than driving

− Need transportation to/from station

− Less flexibility than driving

At a Glance

	Drive	Fly	Train	Bus
Door-to-door time	4h 38m	3h 16m	9h 1m	5h 54m
Total cost (1 person)	$76	$124	$25	$14
Carbon footprint	75 kg CO₂	27 kg CO₂	7 kg CO₂	7 kg CO₂
Flexibility	High	Low
Luggage	Unlimited	Restricted
Reliability	Weather dependent	Data unavailable

Drive data: OSRM routing, EIA fuel prices

Flight data: Statistical estimate

Airports: OurAirports

Transit: Amtrak GTFS, FlixBus GTFS — fares estimated

Confidence: Medium — airports identified, fares estimated

Costs are estimates. Actual flight prices vary by airline, date, and booking time. Drive costs based on OSRM routing, EIA fuel prices. Computed Apr 13, 2026.

Decided to drive? See the full trip plan from Aspen, CO to Castle Rock, CO with stops, fuel costs, and turn-by-turn directions.