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You can use a numeric stepper. The user may enter the value with the keyboard, or use the up/down arrows. The default value should be empty (no distance filter). EDIT : See comment by @FodderZone download bmml source – Wireframes created with Balsamiq Mockups
I think a slider that has stepped values should work reasonably well on a mobile device too, especially if you don't have to be very precise with the distance. The end points can be a minimum distance, and the maximal value can be everywhere.
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