United MileagePlus is offering a 20% discount on roundtrip saver economy awards between the US (excluding Hawaii) or Canada and Mexico City if you book by April 29 and travel in May.

That’s a 7000 mile discount — 28,000 miles instead of the usual 35,000.

Of course travel must be booked less than 21 days out to qualify for this discount, so most members will have to pay United’s close-in booking fees ($75 for general members, $50 for Silver, $25 for Gold, waived for Platinum and above).

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