Average speed per stage
The average speed over all stages is 38.2727 km/hour. The average speed for the whole race is computed by dividing the total distance by the sum of stage times of the final GC winner. In the last column the average speed up to that stage is shown. This is the average speed for the leader in the race at that stage.
| Stage | KM | Avg. speed stage winner | Total avg. speed after stage | |
|---|---|---|---|---|
| Stage 1 | Esquipulas - Esquipulas | 175 | 42.064 | 42.064 | |
| Stage 2 | Teculutan - Puerto Barrios | 168 | 39.388 | 40.709 | |
| Stage 3 | Puerto Barrios - Zacapa | 169 | 38.888 | 40.09 | |
| Stage 4 | Teculutan - Coban | 176 | 37.238 | 39.319 | |
| Stage 5 | Posada del Quetzal - Jalapa | 150 | 39.503 | 39.283 | |
| Stage 6 | Jalapa - Don Justo | 140 | 35.709 | 38.714 | |
| Stage 7 | Guatemala City - Retalhuleu | 187 | 43.259 | 39.343 | |
| Stage 8 | Retalhuleu - Quetzaltenango | 105 | 36.57 | 39.098 | |
| Stage 9 | Quetzaltenango - Quetzaltenango | 113 | 33.361 | 38.539 | |
| Stage 10 | San Pedro - Huehuetenango | 135 | 38.172 | 38.487 | |
| Stage 11 | Huehuetenango - Solola (El Tablon) | 139 | 35.394 | 38.148 | |
| Stage 12 | Panajachel - Guatemala City | 144 | 41.911 | 38.417 | |
| Stage 13 | Guatemala City - Guatemala City | 120 | 36.738 | 38.273 | |
| 1921 |