Drive or Fly: Greeley, 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 DEN–DEN. At 93 miles, driving is the only practical option.

Passengers:

Vehicle:

Find Your Vehicle (EPA fuel economy data)

Drive

Door to Door

1h 47m

Distance

93.5 mi

Total Cost

$56

CO2

38 kg

Cost Breakdown

Diesel$21

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

4h 1m

9m in the air

Air Distance

73 mi

Total Cost

$123

CO2

19 kg

Door-to-Door Timeline

Greeley, CO → DEN 59m

Check-in & Security 90m

Flight 9m

Arrival & Baggage 30m

DEN → Castle Rock, CO 53m

Cost Breakdown

Ticket (1 pax @ $123) $123

Airports

Greeley, CO DEN — Denver International Airport 39 mi, ~59m drive

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

No scheduled flights found

No commercial flights between DEN 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

Bus

FlixBus

Door to Door

2h 36m

1h 5m on road

Total Cost

CO2

3 kg

Route

Greyhound US0560S

Door-to-Door Timeline

Greeley, CO → Harmony Transfer Centre (FON6) 25m

Boarding 15m

Bus ride 65m

Arrival 10m

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

Cost Breakdown

Ticket (1 pax @ $6) $6

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

Stations

From FON6 — Harmony Transfer Centre 17 mi, ~25m 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	Bus
Door-to-door time	1h 47m	4h 1m	2h 36m
Total cost (1 person)	$56	$123	$6
Carbon footprint	38 kg CO₂	19 kg CO₂	3 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: 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 15, 2026.

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