Drive or Fly: Saint Peters, MO to Byrnes Mill, MO?

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 STL–STL. At 42 miles, driving is the only practical option.

Passengers:

Vehicle:

Drive

Door to Door

57m

Distance

42.8 mi

Total Cost

$45

CO2

17 kg

Cost Breakdown

Diesel$10

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

3m in the air

Air Distance

25 mi

Total Cost

$121

CO2

6 kg

Door-to-Door Timeline

Saint Peters, MO → STL 21m

Check-in & Security 90m

Flight 3m

Arrival & Baggage 30m

STL → Byrnes Mill, MO 36m

Cost Breakdown

Ticket (1 pax @ $121) $121

Airports

Saint Peters, MO STL — St. Louis Lambert International Airport 14 mi, ~21m drive

Byrnes Mill, MO STL — St. Louis Lambert International Airport 24 mi, ~36m drive

No scheduled flights found

No commercial flights between STL and STL. 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

At a Glance

	Drive	Fly
Door-to-door time	57m	3h
Total cost (1 person)	$45	$121
Carbon footprint	17 kg CO₂	6 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

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 12, 2026.

Decided to drive? See the full trip plan from Saint Peters, MO to Byrnes Mill, MO with stops, fuel costs, and turn-by-turn directions.