The last few weeks have seen an onslaught of airfare sales and specials for fall travel. If you’ve already taken your summer vacation or it’s just not going to happen this year, start planning a trip for when the weather starts to cool (it will happen at some point, right?) and the leaves start to change.

Here’s a look at a few of the fall airfare sales and deals that are currently up and running:

Southwest Airlines Sale ($49+ one-way and Up)

Southwest Airlines kicked off a new airfare sale this week that features deals to/from cities across the country. Airfare on some routes starts as low as $49+ one-way.

Purchase your airline ticket by 11:59 PM PT on August 5, 2010 for Tuesday and Wednesday travel between September 7 – December 14, 2010.

Visit Southwest Airlines for more details.

Aer Lingus “Welcome to Ireland” Airfare Sale

This one actually features deals all the way through next March. You can find flights to Dublin and Shannon from Chicago, New York, and Boston. Prices vary significantly depending on departure date and city-pair.

Visit Aer Lingus for complete details and make sure to purchase your airline ticket by 7:00 PM ET on July 28, 2010.

Virgin America “Fares to Fly By”

The latest of Virgin America’s “Fares to Fly By” include deals on a range of their West Coast and cross-country routes. Airfare starts as low as $59+ one-way on some flights.

Grab your ticket by 11:59pm PDT on July 26 for travel between August 24 and November 17, 2010. Check out flights on Virgin America for their latest fall airfare deals.

United Airlines Hawaii Airfare Deals

Spend some time away from the stress of the Mainland and head to Hawaii. United Airlines has deals to Honolulu, Maui, and Kauai from select U.S. cities.

A 21-day advance purchase is required, and deals are good for Tuesday, Wednesday, and Saturday travel between August 17 and November 17, 2010.

Take a look at United Airlines Hawaii Flights for their latest fares from your hometown.