[Edited 2:00pm PDT: And zap… it’s gone. This fare was pulled in the last hour or so from all cities. Hope you got in on the deal while it lasted!]
Here’s a pretty amazing 2.58 CPM mileage run on United. Availability is rather limited for the routing in my example below, but other connection city options are available at a higher CPM.
I wouldn’t expect this $78 Seattle-Miami one-way base fare to last beyond Thursday (at the latest), so act fast. [Edited 11:15am PDT: After reading BucketList’s comment, I re-checked the base fare and it’s dropped to $68 one-way… even better now! If you booked at the higher fare, you can always make a new reservation at the lower fare, then cancel the first one since you’re likely still within the 24-hours of booking.]
The fare is also available from San Diego and Dallas. One example itinerary from San Diego at an even better 2.44 CPM (7,680 PQMs for $187.40) is below. The routing rules for SAN are as follows: SAN-SFO/LAX/DEN-WAS/HOU/DEN/CLT/CLE/CHI-MIA.
Here’s the nitty-gritty and an example itinerary for the Seattle-Miami fare.
Routing: Seattle to Newark to Miami r/t
Routing rules: SEA-WAS/SFO/LAX/HOU/EWR/DEN/CLE/CHI-MIA
Travel period: Now through end-of-schedule (but not worth it in 2014 given United’s new PQD requirement).
Dates I found available: 9/10; 10/15; 11/19; 12/3 for 0-nighters – 9/17; 9/24 for 1-nighters with a very tight connection, or 11/12 for a 1-nighter with a decent connection. A 12/7 departure is also available with 2-nights in Miami.
Minimum stay requirement: None
Day of week restrictions: Tuesdays, Wednesdays and Saturdays only
Fare basis: NAK21KS, 21-day advance purchase
Fare: $179.60 all-in roundtrip
Premier Qualifying Miles earned: 6,974
Cents-per-mile (CPM): 2.58
It’s valid originating out of either city and one date I found available out of Miami with a 0-night stay is September 28 (a Saturday, returning to Miami on Sunday via a redeye through Newark).
The above itinerary was found using ITA’s Matrix Airfare Search, but can be booked on United directly or with greater ease using Hipmunk.