Drive or Fly: Caldwell, ID to Post Falls, ID?

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

Could go either way

Medium

This distance is a toss-up. Drive if you want flexibility and lower cost, fly if you value time. Connecting flights add time.

Passengers:

Vehicle:

Find Your Vehicle (EPA fuel economy data)

Drive

Door to Door

7h 42m

Distance

418.3 mi

Total Cost

$137

CO2

169 kg

Cost Breakdown

Diesel$102

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

− Driver fatigue on longer stretches

− Wear and tear on vehicle

− Fuel price fluctuations

Plan the drive

Fly

Door to Door

3h 52m

34m in the air

Air Distance

280 mi

Total Cost

$186

CO2

72 kg

Door-to-Door Timeline

Caldwell, ID → BOI 36m

Check-in & Security 90m

Flight 34m

Arrival & Baggage 30m

GEG → Post Falls, ID 42m

Cost Breakdown

Ticket (1 pax @ $131) $131

Rental car (1 day)$55

Airports

Caldwell, ID BOI — Boise Air Terminal/Gowen Field 24 mi, ~36m drive

Post Falls, ID GEG — Spokane International Airport 28 mi, ~42m drive

Flight Data

Service

Connecting only

On-Time

100.0%

+ Saves about 3h 50m compared to driving

+ Less physical fatigue

+ Predictable arrival time

− Airport security and check-in overhead

− May need a rental car at destination

− Luggage fees and restrictions

− Less flexibility for stops along the way

At a Glance

	Drive	Fly
Door-to-door time	7h 42m	3h 52m
Total cost (1 person)	$137	$186
Carbon footprint	169 kg CO₂	72 kg CO₂
Flexibility	High	Low
Luggage	Unlimited	Restricted
Reliability	Weather dependent	100% on-time

Drive data: OSRM routing, EIA fuel prices

Flight data: Statistical estimate

Airports: OurAirports

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 Oct 19, 2026.

Route Options

2 different routes between these cities.

Fastest

418.3 mi 7h 41m

via I 84; US 20; US 26; US 30, US 395, I 90; US 2; US 395

Shortest (+22 min)

391.7 mi 8h 4m

via US 95, US 95; ID 6, I 84; US 20; US 26; US 30

Decided to drive? See the full trip plan from Caldwell, ID to Post Falls, ID with stops, fuel costs, and turn-by-turn directions.