Drive or Fly: Boulder, CO to Aspen, 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 BJC–ASE. At 170 miles, driving is the only practical option.

Passengers:

Vehicle:

Drive

Door to Door

4h 28m

Distance

170.3 mi

Total Cost

$73

CO2

69 kg

Cost Breakdown

Diesel$38

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

2h 39m

12m in the air

Air Distance

100 mi

Total Cost

$124

CO2

26 kg

Door-to-Door Timeline

Boulder, CO → BJC 17m

Check-in & Security 90m

Flight 12m

Arrival & Baggage 30m

ASE → Aspen, CO 10m

Cost Breakdown

Ticket (1 pax @ $124) $124

Airports

Boulder, CO BJC — Rocky Mountain Metropolitan Airport 11 mi, ~17m drive

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

No scheduled flights found

No commercial flights between BJC and ASE. 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

5h 50m on rail

Total Cost

$25

CO2

7 kg

Route

California Zephyr

Door-to-Door Timeline

Boulder, CO → Denver 35m

Boarding 30m

Train ride 350m

Arrival 10m

Glenwood Springs → Aspen, CO 55m

Cost Breakdown

Ticket (1 pax @ $25) $25

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

Stations

From Denver 23 mi, ~35m drive

To Glenwood Springs 37 mi, ~55m 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 43m

3h 45m on road

Total Cost

$14

CO2

7 kg

Route

Greyhound US1200

Door-to-Door Timeline

Boulder, CO → Denver Union Station Bus Concourse (DEN6) 35m

Boarding 15m

Bus ride 225m

Arrival 10m

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

Cost Breakdown

Ticket (1 pax @ $14) $14

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

Stations

From DEN6 — Denver Union Station Bus Concourse 23 mi, ~35m drive

To GWS6 — Glenwood Springs (W Glenwood Mall) 39 mi, ~58m 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 28m	2h 39m	8h	5h 43m
Total cost (1 person)	$73	$124	$25	$14
Carbon footprint	69 kg CO₂	26 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 12, 2026.

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