Drive or Fly: Longmont, CO to Castle Pines, 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–DEN. At 61 miles, driving is the only practical option.

Passengers:

Vehicle:

Find Your Vehicle (EPA fuel economy data)

Drive

Door to Door

1h 18m

Distance

61.5 mi

Total Cost

$49

CO2

25 kg

Cost Breakdown

Diesel$14

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 18m

6m in the air

Air Distance

50 mi

Total Cost

$122

CO2

13 kg

Door-to-Door Timeline

Longmont, CO → BJC 27m

Check-in & Security 90m

Flight 6m

Arrival & Baggage 30m

DEN → Castle Pines, CO 45m

Cost Breakdown

Ticket (1 pax @ $122) $122

Airports

Longmont, CO BJC — Rocky Mountain Metropolitan Airport 18 mi, ~27m drive

Castle Pines, CO DEN — Denver International Airport 30 mi, ~45m drive

No scheduled flights found

No commercial flights between BJC 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 40m

1h 5m on road

Total Cost

CO2

3 kg

Route

Greyhound US0560S

Door-to-Door Timeline

Longmont, CO → Harmony Transfer Centre (FON6) 38m

Boarding 15m

Bus ride 65m

Arrival 10m

Denver Union Station Bus Concourse (DEN6) → Castle Pines, CO 32m

Cost Breakdown

Ticket (1 pax @ $6) $6

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

Stations

From FON6 — Harmony Transfer Centre 25 mi, ~38m drive

To DEN6 — Denver Union Station Bus Concourse 21 mi, ~32m 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 18m	3h 18m	2h 40m
Total cost (1 person)	$49	$122	$6
Carbon footprint	25 kg CO₂	13 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 18, 2026.

Route Options

2 different routes between these cities.

Fastest

61.5 mi 1h 18m

via I 25

Shortest (+1 min)

58.5 mi 1h 19m

via I 25; US 87, US 287

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