DriveCosts

Road trip cost

How Much Does It Cost to Drive From St. George to Boise?

At 556 miles and roughly 9 hr of driving, the route from St. George, UT to Boise, ID is a long-haul trip. Budget for multiple fuel stops, food, and possibly an overnight stay — gas alone can run well over a hundred dollars depending on your vehicle.

Long-haulLong haul
  • Updated for 2026
  • US avg fuel prices
  • EPA-style MPG
  • EV rates vary by state
  • US units
Distance

556 mi

Driving time

9 hr

Fuel stops

1

EV charges

2

Route overview556 mi

1 suggested fuel stop

Key takeaway

Plan on about $69 in gas one-way in a 28 MPG sedan, with 1 fuel stop and roughly 9 hr behind the wheel.

Drive intensity

Long-haul

Consider an overnight stop.

Estimate your trip cost

Pre-filled with the St. George → Boise distance.

miles
mpg
$/gal

Estimated Trip Cost

$0.00

Per Person

$0.00

Gallons

0.00gal

Total miles: 556 (one way).

How we estimate this trip

Distance
Great-circle distance between city centers × 1.18 road factor, rounded to whole miles.
Fuel cost formula
(miles ÷ MPG) × price per gallon, computed one-way unless noted.
Gas price assumption
Recent US average retail regular gas (AAA-style baseline).
EV charging assumption
Combined MPGe with average US residential electricity rate.
Tolls & weather
Not included — add manually for I-95, I-90 and mountain routes.
Driving time
Estimated at typical highway average speeds; excludes long breaks.

Sources & assumptions

  • EPA fuel economy data — City / highway / combined MPG and MPGe baselines.
  • U.S. Department of Energy (fueleconomy.gov) — Vehicle efficiency and EV range references.
  • AAA gas price trends — Recent national and regional retail fuel averages.
  • EIA electricity rates — Average residential per-kWh prices used for EV charging.

We summarize publicly available data — no scraping, no external API calls. Figures are calibrated periodically; use the calculators above for your exact inputs.

Fuel cost by vehicle type

Estimated one-way fuel cost at $3.45/gal (US average). Adjust for your local price.

Compact car· 35 MPG · 15.9 gal$54.81
Sedan· 28 MPG · 19.9 gal$68.51
SUV· 22 MPG · 25.3 gal$87.19
Pickup truck· 18 MPG · 30.9 gal$106.57

Cost at different gas prices

Assuming a 28 MPG sedan over the 556-mile route.

Gas at $3.15/gal

$62.55

one way · ~19.9 gal

Gas at $3.45/gal

$68.51

one way · ~19.9 gal

Gas at $3.85/gal

$76.45

one way · ~19.9 gal

Fuel & charging stops

1 fuel stop one-way

A typical 28 MPG sedan with a 12.5-gallon tank covers about 350 miles per fill-up. Plan 1 stop along the way and fuel up before any remote stretches.

2 DC fast-charges for most EVs

Assuming a realistic 230-mile highway range, plan 2 DC fast-charging stops. Tesla Superchargers and Electrify America have strong coverage on most US corridors.

Halfway stop suggestion

Midpoint

Provo, UT

Roughly halfway between St. George and Boise. A natural place to fuel up, grab a meal, swap drivers, or stop overnight on longer drives.

Route personality

Long-distance interstate driveOvernight-friendly

Mountain West driving context

  • Mountain passes can require chains or AWD from November through April — check CDOT/UDOT before departure.
  • Elevation gain reduces gas MPG and EV range by 10–20% on climbs; you recover some on descents.
  • Cell coverage drops in canyons — download offline maps before you go.

City insights

St. George, UT

  • Limited shade and long distances between services around St. George — fuel up before leaving.

Boise, ID

  • Government and event-day closures around downtown Boise can reroute traffic.

Best stops along the way

  • Provo, UT sits near the midpoint — natural fuel, food and restroom stop.
  • Pick a sit-down meal stop around the 2.5-hour mark to reset focus and avoid drive-thru fatigue.
  • Truck-stop plazas (Pilot, Love's, TA) reliably have fuel, food and clean restrooms every 60–90 miles.
  • Mountain pass viewpoints make great photo stops — but check brakes before long descents.

Seasonal notes

Winter

Snow, ice and chain-control zones from late November through March — carry an emergency kit.

Summer

Desert highs over 110°F stress engines, tires and EV batteries — drive early or late, never midday.

Late summer / early fall

Western wildfire smoke can drop visibility and force I-5 / I-80 detours — check InciWeb.

Fall–Spring

Pacific Northwest rain is steady October–April; allow extra braking distance on I-5 and US-101.

Recommendations for this route

  • Hybrid or efficient sedan recommended — fewer fast chargers on this corridor.
  • AWD or all-terrain tires help in winter; check brake pads before long descents.
  • Split the drive across a meal stop or overnight — fatigue starts hurting reaction time after 5 hours.
  • Run tires at the door-jamb PSI and pre-cool the cabin with AC on low — both add 1–3 MPG.

Is it cheaper to fly or drive?

For one or two people, driving usually wins on cost. Solo travelers with no luggage may find a budget flight cheaper once you add parking and meals.

A one-way drive uses about $69 in gas (28 MPG, $3.45/gal). A typical short domestic flight costs $80–$220 per person plus $30–$60/day for airport parking and any baggage fees.

Weather & best time

October through April is most comfortable. Summer driving means extreme heat and higher AC fuel use.

  • • Summer highs over 100°F across the desert — drive early morning or after sunset and carry extra water.

Tolls

Mostly toll-free — you can drive this without a transponder.

Best vehicle

A mid-size sedan or hybrid is the sweet spot — comfortable for the distance with strong MPG.

Driving difficulty

Long-haul · 9 hr

High — swap drivers every 2–3 hours and consider splitting the drive over a meal stop.

Overnight stop recommended

At 9 hr of driving, splitting the trip across two days is safer and more enjoyable. Budget hotels along the route typically run $70–$130/night.

About the drive from St. George to Boise

This 556-mile route between St. George, UT and Boise, ID is a popular drive in the region. Expect roughly 9 hr behind the wheel under normal traffic conditions.

Fuel-saving tips

  • Keep your speed near 65 mph — fuel economy drops sharply above 70.
  • Fill up before mountain or desert stretches; remote stations charge a premium.
  • Use GasBuddy or AAA to spot cheap stations along your route before you leave.

Frequently asked questions

How long does it take to drive from St. George to Boise?

The drive is about 556 miles and takes roughly 9 hr under normal traffic. Add buffer for stops, construction, and rush hour around either city.

How much gas does the trip use?

In a 28 MPG sedan, expect about 19.9 gallons one way. A 22 MPG SUV would use roughly 25.3 gallons.

What's the typical fuel cost?

At the US average of $3.45/gal, a 28 MPG vehicle costs about $68.51 one way. Round trip roughly doubles that. Use the calculator above for your exact MPG and local gas price.

How many fuel or charging stops will I need?

A typical gas sedan needs about 1 fuel stop one way. A modern EV with ~230 miles of highway range needs about 2 DC fast-charges.

Is it cheaper to drive or fly from St. George to Boise?

For one or two people, driving usually wins on cost. Solo travelers with no luggage may find a budget flight cheaper once you add parking and meals.

What's the best time of year to drive this route?

October through April is most comfortable. Summer driving means extreme heat and higher AC fuel use.

Where's a good halfway stop?

Provo, UT is roughly halfway and makes a natural fuel, food, or overnight break.

Best vehicles for this route

Estimated 556-mile fuel cost for each pick at average US prices. Tap any vehicle for a full cost breakdown.

Cheapest to drive

Toyota Prius

57 MPG · hybrid

~$34

est. one-way fuel cost

See full breakdown

Best EV

Lucid Air

134 MPGe · ev

~$22

est. one-way charging cost

See full breakdown

Best sedan

Hyundai Elantra

37 MPG · sedan

~$52

est. one-way fuel cost

See full breakdown

Best SUV for comfort

Nissan Rogue

33 MPG · suv

~$58

est. one-way fuel cost

See full breakdown

Best truck for cargo

Ford Maverick

26 MPG · truck

~$74

est. one-way fuel cost

See full breakdown

Related routes

More routes like St. George to Boise

Reverse drives, connecting routes and regional alternatives — each with distance and driving cost at current US gas prices.

Reverse drive

Boise to St. George driving cost

556 mi · 9.0 h

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