United is offering a 20% discount on MileagePlus Saver Awards flights to Mexico City.
Saver Awards from the U.S. (excluding Hawaii & Guam) or Canada to Mexico City usually cost 35,000 miles. However, with this offer these same awards will only cost 28,000 miles.
I haven’t been to Mexico City and can’t say that I have the desire to visit any time in the near future but if you do, that’s a pretty nice savings
