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Aviation APIs Great Circle Distance
x402
Aviation APIs Great Circle Distance is a paid API for AI agents from aviationapis.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Calculates the great circle distance and bearing between two geographic coordinates, optionally computing estimated time en route given a ground speed.
Price / call$0.01
Success—
StatusUnknown
How this service works
Calculates the shortest distance between two points on Earth using great-circle math.
Output
Returns a JSON object with the great circle distance in kilometers, nautical miles, and statute miles; initial and final bearings in degrees; and optionally estimated time en route in both HH:MM:SS format and decimal minutes if a ground speed was provided.
Example use cases
Example prompt
“What's the great circle distance and estimated flight time from SFO (lat 37.6188, lon -122.375) to JFK (lat 40.6398, lon -73.7789) at a ground speed of 450 knots, including the initial and final bearings?”
Technical details
Endpoint
POSThttps://aviationapis.com/great-circle-distanceWhen to prefer
Use this endpoint when you need aviation-grade great circle distance and bearing calculations between two geographic points, especially when nautical miles and estimated time en route at a given knot speed are required. Prefer over generic geodesic calculators when the output needs to include initial/final bearings and ETE in HMS format suitable for flight planning.
Side effects
- Missing required lat/lon fields returns a 400-level error
- Latitude out of range (-90 to 90) or longitude out of range (-180 to 180) causes validation failure
- Negative or zero ground speed may produce nonsensical ETE values
- Payment failure via x402 protocol returns 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | object | |
| from | object | |
| groundspeed_kt | number | Optional ground speed (kt) to compute estimated time en route |
Output
Schema · Response
{
"type": "json",
"example": {
"to": {
"lat": 40.6398,
"lon": -73.7789
},
"from": {
"lat": 37.6188,
"lon": -122.375
},
"ete_hms": "04:57:56",
"distance_km": 4138.3,
"distance_nm": 2234.5,
"distance_sm": 2571.5,
"ete_minutes": 297.9,
"groundspeed_kt": 450,
"final_bearing_deg": 119.6,
"initial_bearing_deg": 69.8
}
}Tags
x402
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