St. Mary's County Regional Airport
Daylight today(Jul 16, 2026, local time)
About 14h 34m of daylight. Civil twilight (dawn/dusk) approximates the FAA definition of night for logging and currency. Times are computed and approximate — verify with official sources.
About St. Mary's County Regional Airport
St. Mary's County Regional Airport, also known as Captain Walter Francis Duke Regional Airport, is a public airport located in St. Mary's County, Maryland, United States, four miles northeast of the central business district of Leonardtown. The airport is also located 8 nmi (15 km) west of Naval Air Station Patuxent River. It is owned and operated by the St. Mary's County Board of County Commissioners.
Summary from Wikipedia, photo via Wikimedia Commons, licensed under CC BY-SA.
Map
Runway centrelines, navaids and overlapping airspace. Tiles © OpenStreetMap contributors. Reference only — not for navigation.
Runways (1)
| Runway | Length | Width | Surface | Lighting | Status |
|---|---|---|---|---|---|
| 11 / 29 | 4,150 ft / 1,265 m | 75 ft | Asph-g | Lighted | Open |
Radio frequencies (4)
| Type | Description | Frequency |
|---|---|---|
| A/D | PATUXENT APP/DEP | 120.050 MHz |
| AWOS | AWOS 3 | 119.575 MHz |
| RDO | LEESBURG RDO | 117.600 MHz |
| UNIC | CTAF/UNICOM | 123.000 MHz |
Airspace in this area(2)
| Name | Class | Type | Floor | Ceiling |
|---|---|---|---|---|
| R4006 0700-2300 LCL DAILY; OTH TIMES AS SPECIFIED BY NOTAM | Special use | Restricted | 3500 ft MSL | 25000 ft MSL |
| R4007 0700-2300 LCL DAILY; OTH TIMES AS SPECIFIED BY NOTAM | Special use | Restricted | GND | 4999 ft MSL |
Approximate bounding-box match from OpenAIP · all United States airspace. Reference only — consult official charts for exact boundaries and status.
Tall obstacles nearby
| Obstacle | Height AGL | Top (MSL) | Lit |
|---|---|---|---|
| Obstacle | 449 ft | 125 ft | — |
| Obstacle | 420 ft | 141 ft | — |
| Obstacle | 400 ft | 148 ft | — |
| Obstacle | 374 ft | 128 ft | — |
| Obstacle | 262 ft | 82 ft | — |
Tallest obstacles within ~10 nm. Data via OpenAIP. Reference only — consult official charts.
Nearby airports
Great-circle distance and true bearing from St. Mary's County Regional Airport.
Frequently asked questions
What is the airport code for St. Mary's County Regional Airport?
St. Mary's County Regional Airport uses the IATA code LTW.
Where is St. Mary's County Regional Airport located?
St. Mary's County Regional Airport is small airport located in California, United States, at an elevation of 142 ft (43 m).
How many runways does St. Mary's County Regional Airport have?
St. Mary's County Regional Airport has 1 runway, the longest being 4,150 ft / 1,265 m.
What time zone is St. Mary's County Regional Airport in?
St. Mary's County Regional Airport is in the America/New York time zone (UTC-04:00).
What is the magnetic variation at St. Mary's County Regional Airport?
The magnetic variation (declination) at St. Mary's County Regional Airport is approximately 10.9° W, per the World Magnetic Model. Variation changes slowly over time — always use the current value charted for navigation.
What airports are near St. Mary's County Regional Airport?
The nearest airport to St. Mary's County Regional Airport is Mears Creek Airfield (4MD0), about 4.7 nm to the ne, followed by Hampton Airport and Patuxent River Naval Air Station (Trapnell Field).
Is the information on this page suitable for flight planning?
No. St. Mary's County Regional Airport data here is for reference and training only — not for navigation. Always consult official sources and current charts before any flight.