A stable location for this would be really nice…
At the moment, it’s available in JSON within the HTML for the pricing page:
const regionMarkups = {
"iad": 1,
"ewr": 1,
"ams": 1.038461538,
"arn": 1.038461538,
"bom": 1.076923077,
"mad": 1.096153846,
"yul": 1.115384615,
"yyz": 1.115384615,
"lhr": 1.134615385,
"cdg": 1.134615385,
"fra": 1.153846154,
"sjc": 1.192307692,
"lax": 1.199519231,
"atl": 1.25,
"bos": 1.25,
"ord": 1.25,
"dfw": 1.25,
"den": 1.25,
"mia": 1.25,
"phx": 1.25,
"sea": 1.25,
"sin": 1.269230769,
"syd": 1.269230769,
"jnb": 1.302884615,
"nrt": 1.307692308,
"otp": 1.326923077,
"waw": 1.326923077,
"gdl": 1.350961538,
"qro": 1.350961538,
"hkg": 1.403846154,
"bog": 1.615384615,
"gig": 1.615384615,
"gru": 1.615384615,
"scl": 1.697115385,
"eze": 1.858173077,
};
(These are the multipliers relative to ewr, the cheapest region. Poor eze!)
But that could change without warning, of course.