Originally Posted by
jamespvg
I have both Avios and Mileage Plan miles. When the choice is between a flight that costs €450 or a 4,750 Avios + $35, I consider that a pretty good use of Avios. But YMMV, of course

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For LHR-AMS? Are you buying walk up fares or something? The standard one way fare on BA seems to be around $120 for economy or $220 for business. €450 is really expensive.