United Airlines has lower round trip fares at $318 for San Francisco SFO to Cancun, Mexico than American Airlines lowest fare at $355 round trip. These low fares are only for departures in June and July. One thing to know about United is most fares in the $330s round trip have a long layover from 7 to 12+ hours at Denver DEN or Houston IAD and some are overnight layovers. The same deal applies to American Airlines tickets, except mostly worse schedules. The lowest fares involve flights with 11 to 14 hour layovers, mostly overnight in either DFW or PHX. There are nonstop flights in July on United for $375 round trip.
This is a fare that is better to search in Google Flights one-way mode. There are also low one fares with Delta, Aeromexico and Spirit on some dates.
One of the few low fare dates on AA without a long layover is a flight on July 4 SFO-CUN.
American Airlines San Francisco SFO – Cancun CUN
$163.71 one way Monday July 4
71 minutes in DFW.
American charges $255 to fly back to SFO on Sunday July 10 with a 13 hour layover in DFW. United will fly you back to SFO nonstop for $249. That makes for a $413 round trip.
United Airlines has better itineraries
United Airlines is the better itinerary for this SFO-Cancun ticket at a lower price.
United Airlines San Francisco SFO – Cancun CUN
$336.98 round trip Tuesday July 5 – Monday July 11
Google Flights Fare Calendar June-July
SFO-CUN one-way filtered for Oneworld Alliance shows more than half the dates in June and July 2016 with $164 or $174 one way fares.
Google Flights Fare Calendar June-July
SFO-CUN one way filtered for Star Alliance shows more than half the dates in June and July 2016 with $160 or $164 one way fares.
Loyalty Traveler curated Airfare Deals and Google Flights and Kayak Explore tutorials.
Loyalty Traveler – Hotel Promotions Guide May 2016.
