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Drive or Fly: Post Falls, ID to Eagle, 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

8h 6m

Distance

436.9 mi

Total Cost

$143

CO2

177 kg

Cost Breakdown

Diesel$108
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 33m

34m in the air

Air Distance

279 mi

Total Cost

$186

CO2

71 kg

Door-to-Door Timeline

Post Falls, ID → GEG 42m
Check-in & Security 90m
Flight 34m
Arrival & Baggage 30m
BOI → Eagle, ID 17m

Cost Breakdown

Ticket (1 pax @ $131) $131
Rental car (1 day)$55

Airports

Post Falls, ID GEG — Spokane International Airport 28 mi, ~42m drive
Eagle, ID BOI — Boise Air Terminal/Gowen Field 11 mi, ~17m drive

Flight Data

Service

Connecting only

On-Time

100.0%

+ Saves about 4h 33m 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 8h 6m 3h 33m
Total cost (1 person) $143 $186
Carbon footprint 177 kg CO2 71 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 23, 2026.

Route Options

2 different routes between these cities.

Fastest
436.9 mi 8h 5m

via I 84; US 30; US 395, US 395, I 90; US 395

Shortest (+5 min)
380.1 mi 8h 11m

via US 95, ID 55, I 90

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