Dl/ua/aa BOS/WAS-MEX, ~$650, 8k EQM
 

Delta
G and Z fares
out of BWI
$629 on a lot of dates
looks like wide open availability until December

United
P fares, nonstop
out of BWI and IAD
$648 on with availability April/May

American
I fares
out of BWI, $100 more for IAD
$663 with April/May availability

You'll get around 7000-8000 EQM/PQM

Same day turns are available too - but it's a loooong day. This could be very helpful towards the end of the year. Nice find OP!

Hi, how are you getting 8000 EQM?

One way distance is 2152 miles, so assuming you are calculating AS EQM, that's 2152*2*1.5 = 6456 EQM.

United and American give 2x EQM on their own metal.

If you route through JFK on Delta, on certain days they are showing lay flats.

https://goo.gl/flights/yP4H

Fares also available from JFK on AA for ~100 more. Unfortunately it looks like AA only flies 737s and A320s into MEX, so no options for lie flats for OW.

Looks like Boston has same fares on American, into the summer, Delta year round.

FYI, I was looking recently on Aeromexico and found that flights IAD-MEX-TIJ fall into a similar price range for business class and will yield the 150% DL MQM for someone traveling to the San Diego area. Just an overnight red eye outbound, layover, and the second connection back north. Return appears possible same-day. Definitely cheaper and more MQM rich than flying coast-to-coast in domestic first class to San Diego.