Drive or Fly: Boulder, CO to Longmont, 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–BJC. At 15 miles, driving is the only practical option.

Passengers:

Vehicle:

Drive

Door to Door

26m

Distance

15.6 mi

Total Cost

$38

CO2

6 kg

Cost Breakdown

Diesel$3

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 46m

2m in the air

Air Distance

14 mi

Total Cost

$121

CO2

4 kg

Door-to-Door Timeline

Boulder, CO → BJC 17m

Check-in & Security 90m

Flight 2m

Arrival & Baggage 30m

BJC → Longmont, CO 27m

Cost Breakdown

Ticket (1 pax @ $121) $121

Airports

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

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

No scheduled flights found

No commercial flights between BJC and BJC. 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 43m

1h 5m on road

Total Cost

CO2

3 kg

Route

Greyhound US0560S

Door-to-Door Timeline

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

Boarding 15m

Bus ride 65m

Arrival 10m

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

Cost Breakdown

Ticket (1 pax @ $6) $6

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

Stations

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

To FON6 — Harmony Transfer Centre 25 mi, ~38m 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	26m	2h 46m	2h 43m
Total cost (1 person)	$38	$121	$6
Carbon footprint	6 kg CO₂	4 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 13, 2026.

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