| Merthyr Tudful to Nyon | 570.55 mi (918.21 km) |
| Merthyr Tudful to Oberriet | 654.85 mi (1,053.88 km) |
| Merthyr Tudful to Obersiggenthal | 598.52 mi (963.22 km) |
| Merthyr Tudful to Oberwil | 569.05 mi (915.80 km) |
| Merthyr Tudful to Oberwingert | 615.99 mi (991.34 km) |
| Merthyr Tudful to Oftringen | 590.72 mi (950.67 km) |
| Merthyr Tudful to Olten | 588.75 mi (947.51 km) |
| Merthyr Tudful to Onex | 575.72 mi (926.54 km) |
| Merthyr Tudful to Opfikon | 611.25 mi (983.71 km) |
| Merthyr Tudful to Ostermundigen | 589.57 mi (948.82 km) |
| Merthyr Tudful to Payerne | 575.20 mi (925.70 km) |
| Merthyr Tudful to Pfaffikon | 622.23 mi (1,001.38 km) |
| Merthyr Tudful to Plan-les-Ouates | 577.10 mi (928.76 km) |
| Merthyr Tudful to Pratteln | 574.50 mi (924.56 km) |
| Merthyr Tudful to Prilly | 576.20 mi (927.31 km) |
