| Didcot to Mangualde | 821.01 mi (1,321.29 km) |
| Didcot to Marco de Canavezes | 790.97 mi (1,272.94 km) |
| Didcot to Marinha Grande | 898.21 mi (1,445.53 km) |
| Didcot to Massama | 968.78 mi (1,559.10 km) |
| Didcot to Matosinhos | 802.09 mi (1,290.83 km) |
| Didcot to Mealhada | 848.12 mi (1,364.92 km) |
| Didcot to Melgaco | 734.07 mi (1,181.37 km) |
| Didcot to Melres | 803.37 mi (1,292.90 km) |
| Didcot to Mira | 850.48 mi (1,368.71 km) |
| Didcot to Miranda do Corvo | 864.16 mi (1,390.74 km) |
| Didcot to Mirandela | 753.49 mi (1,212.62 km) |
| Didcot to Mogadouro | 755.56 mi (1,215.95 km) |
| Didcot to Moimenta da Beira | 794.00 mi (1,277.81 km) |
| Didcot to Moita | 970.16 mi (1,561.33 km) |
| Didcot to Moncao | 741.35 mi (1,193.08 km) |
