Where was Once Upon a Time in the West filmed?

Filming locations

• Towns & cities Almería Spain Municipality and capital of the province of Almeria, Spain
• Studios & sets Cinecittà Italy Film studio in Rome, Italy

  “Interiors for the film were shot in Cinecittà studios, Rome.” Wikipedia

• Towns & cities La Calahorra Spain Municipality of Spain

  “Shooting for scenes at Cattle Corner Station, as the location was called in the story, was scheduled for four days and was filmed at the "ghost" railway station in the municipality of La Calahorra, near Guadix, in the Province of Granada, Spain, as were the scenes of Flagstone.” Wikipedia

Also per Wikipedia's article

The Wikipedia article names 10 more places. Each links to the sentence that says so.

Places whose own article says it was shot there

1 place says on its own Wikipedia page that this film was shot there. Not on the map: the quote is linked so you can check it.

• Landscapes & nature Monument Valley United States Basin of the Colorado Plateau on the Arizona–Utah border in the western United States

  “Many more recent movies, with other directors, were also filmed in Monument Valley, including Sergio Leone's Once Upon a Time in the West (1968), the first Spaghetti Western to be filmed (in 1967) outside Europe, and Gore Verbinski's The Lone Ranger (2013).” Wikipedia

Recorded only at country level

Also filmed in Arizona, Utah, but the exact places are not known, so they are not on the map.

Also shot in these places

Set in the same places

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