Compiled and reviewed by the US Trip Planner planning team at COD Solutions Oy · Last reviewed Apr 21, 2026 · Editorial standards
Drive Time
42m
Distance
28.6 mi
46 km
Drive Score
6/10
Good drive
Same Day?
Yes, doable
Fuel Cost
$4
one way
EV Charging
Unknown
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Byrnes Mill, MO
Valeria Boltneva
If you are looking for a quick getaway from St. Louis, the 28.6-mile trip to Byrnes Mill is a straightforward drive that takes approximately 42 minutes. Because the distance is so manageable, you can easily complete this journey as a simple one-day trip without needing an overnight stay. You will primarily navigate a combination of I-55, I-270, and MO 30 to reach your destination. With a fuel budget of about $4, this trip is an economical option for those staying within the Midwest region. Whether you are heading out for a change of pace or a specific commitment, the route offers a direct transition from the city into the surrounding area.
| Road | Distance | Duration |
|---|---|---|
| MO 30 | 11.3 mi | 15m |
| I 55 | 9.7 mi | 12m |
| I 270 | 2.8 mi | 3m |
| Upper Byrnes Mill Road | 1.4 mi | 3m |
| South Tucker Boulevard | 1.3 mi | 3m |
| Gravois Avenue | 0.3 mi | <1m |
| Market Street | <0.1 mi | <1m |
Step-by-step road directions between St. Louis, MO and Byrnes Mill, MO.
Start on Market Street
Turn left onto South Tucker Boulevard
Turn straight onto Gravois Avenue
Take the ramp
Merge onto I 55
Take the exit
Keep slight right at fork
Keep slight right at fork
Merge onto I 270
Take the exit
Turn left onto MO 30
Take the exit
Turn slight right onto Upper Byrnes Mill Road
Arrive at destination
5 decision points cluster between mile 1.7 and 15.7 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
Take the ramp toward I 55 South: Memphis
Lane positioning matters here
Take the exit toward US 50, US 61, US 67, I 255, I 270: Lindbergh Boulevard, Chicago, Kansas City
Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one
Keep slight right at fork toward I 255, I 270: Chicago, Kansas City
Highway fork - watch signs carefully. Multiple destination signs - pick the right one
Keep slight right at fork toward I 270 West: Kansas City
Highway fork - watch signs carefully. Lane positioning matters here
Take the exit toward MO 30: Gravois Road
Exit ramp - move to the correct lane early. Lane positioning matters here
Regular Gas
$4.47 one way
$8.94 round trip
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.36 | $4.91 | $9.82 |
| premium | $4.89 | $5.50 | $11.01 |
| diesel | $5.61 | $6.31 | $12.63 |
No toll roads detected on this route.
Drive Cost (one way)
Fuel
$4
Estimated CO2 emission: 10 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $3 in charging · 0 stops · 70% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 8.6 | 0 | $3.00 | $1.37 |
| Efficient EV | 7.2 | 0 | $2.50 | $1.14 |
| EV Truck/SUV | 11.4 | 0 | $4.00 | $1.83 |
Gas CO2
10 kg
EV CO2
3 kg (70% less)
This trip is well within single-charge range for most EVs. No charging stops needed if you start fully charged.
DC fast charging avg $0.35/kWh. Home charging avg $0.16/kWh. US grid CO2: 0.39 kg/kWh.
Current conditions at both ends of the drive.
Origin
Morning in St. Louis on Tuesday
Local time
7:23 AM
CDT
Current temp
69°F
Partly Cloudy
Destination
Morning in Byrnes Mill on Tuesday
Local time
7:23 AM
CDT
Current temp
69°F
Unavailable
Time zone
Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.
Temperature spread
Both ends of the route are sitting at about the same temperature right now.
Road read
The weather snapshot is not static. If you are leaving later, give both cities one more quick forecast check before departure.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
Expect a highway-focused experience, as 83% of this route consists of high-speed travel. You will spend the bulk of your time on major interstates before transitioning onto MO 30, which features the longest uninterrupted stretch of 11.3 miles. The character of the drive shifts from the busy, multi-lane flow of I-270 and I-55 to the more standard pace of state highway travel. Because the drive is highly efficient, you won't encounter the fatigue associated with long-haul transit. Staying focused is key during the interstate portions, where traffic density may be higher than on the final approach to Byrnes Mill.
This is a straightforward highway drive that stays mostly on MO 30 and I 55. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 1.7 miles in.
Focused - lots of decisions in a short distance, but it is over quickly
Balances navigation complexity with total wheel time.
This is a short but busy drive. With 10 decision points packed into just 28.6 miles, you will need to pay attention to lane changes and exits — but the whole thing is over in 42m.
Where does it get tricky?
The main spots that need attention: at 1.7 miles: Lane positioning matters here; at 11.5 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 11.7 miles: Highway fork - watch signs carefully. Multiple destination signs - pick the right one.
Mostly flat terrain
Total Climb
579 ft
Total Descent
573 ft
Highest Point
867 ft
~24.6 mi in
Elevation Range
436 ft
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
Between St. Louis, MO and Byrnes Mill, MO, road signs point toward Chicago and Kansas City.
Chicago
Kansas City
The Gateway City of St. Louis is the epitome of the modern Midwestern metropolis. Missouri's second-largest city is vibrant but laid-back, populous but navigable, historic but still relevant. The city's planners have created an aesthetically beautiful city, with plenty of green space amidst buildings both old and new, framed by the majestic Mississippi and Missouri rivers. And capping it all is the world's tallest man-made monument, the beautiful and iconic Gateway Arch. St. Louis is a city of culture and surprisingly inexpensive. Among American cities, only Washington, D.C. has more free attractions for tourists and residents alike. Hotels, restaurants, and even parking garages avoid the premium pricing common in other big cities. Although often overlooked, St. Louis can be an affordable, educational, and fun family getaway.
City content from Wikivoyage (CC BY-SA 4.0) and Wikidata (CC0).
Weekend Trip
Doable as a same-day drive at 42m. Total distance: 28.6 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
42m drive, comfortable solo distance.
EV Driver
0 DC fast chargers along the route. Coverage: unknown.
First-Time Driver
Mostly highway driving (83%). Some complex stretches to watch for.
Compiled by the US Trip Planner planning team at COD Solutions Oy from open government datasets — OSRM over OpenStreetMap for geometry, EIA for fuel prices, USGS 3DEP for elevation, and NPS for national parks. See our methodology for refresh cadence and limitations.
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