We research all brands listed and may earn a fee from our partners. Research and financial considerations may influence how brands are displayed. Not all brands are included. Learn more.

Published: Oct 06, 2016 5 min read
Joe Raedle—Getty Images

Experienced travelers know that fall is the best season for bargain hunters. The "shoulder season" generally offers decent weather without the crowds—or high-prices—of summer or peak winter holidays.

To boost business during this slow period, airlines frequently resort to deep discounting. Often, airfare prices drop lower the longer you wait into the autumn. Such is the case right now, with terrific sales from JetBlue, Southwest, Frontier Airlines, and Spirit Airlines.

For example, about a month ago a JetBlue sale promoted routes such as Baltimore-Boston starting at $59. This week, that same route is priced from just $44 on JetBlue.

Here are the particulars, as well as a sampling of fares, all listed for one-way travel.

Frontier Airlines

Frontier is known for cheap airfare, but be careful: As with Spirit Airlines, Frontier passengers are prone to being riddled with fees for carry-on bags, seat reservations, and more. So the traveling experience may wind up costing much more than the sample sale prices below, which are generally valid for flights Monday to Thursday or Saturday, only over the next four to six weeks. Availability is very limited on some flights too.

Atlanta to St. Louis
Charlotte to Chicago
Chicago to Pittsburgh
Chicago to Nashville
Columbus to Philadelphia
Fort Myers to Indianapolis

Atlanta to Cleveland
Charlotte to Orlando
Dallas to Milwaukee
Denver to Kansas City

Chicago to Palm Beach
Cincinnati to Houston
Detroit to Orlando

Denver to Los Angeles
Orlando to Denver

Read Next: Why JetBlue Can Break Your Heart, but Comcast Never Will

JetBlue Airways

The cheapest fares with JetBlue's sale are available for flights from Monday to Thursday and Saturdays from October 20, 2016, to January 31, 2017. As usual, there are blackout dates around major holidays. Sale prices must be booked by Thursday, October 6. Here are some of the deals:

Las Vegas to San Francisco
Long Beach to Las Vegas

Fort Lauderdale to New Orleans
Long Beach to Sacramento
Long Beach to Reno

Baltimore to Boston
Boston to New York (LGA)
Buffalo to New York (JFK)
New York (JFK) to Portland

Boston to Richmond
Buffalo to Boston
Charleston to Washington, D.C. (DCA)
Fort Lauderdale to Nassau, Bahamas

Detroit to Fort Lauderdale
Fort Lauderdale to Baltimore

Albany to Fort Lauderdale
Cleveland to Fort Lauderdale

Boston to Barbados

Southwest Airlines

Book trips by October 6 for travel in the U.S. from November 30 to December 20, and from January 4 to February 15. The lowest prices are valid on all days except Fridays and Sundays, subject to availability.

Boise to Sacramento

Albany to Baltimore
Albuquerque to Los Angeles
Atlanta to Chicago
Atlanta to Orlando
Baltimore to Rochester
Burbank to San Jose
Chicago to New York (LGA or EWR)

Albuquerque to San Diego
Burbank to Portland

Baltimore to Grand Rapids
Birmingham to Chicago
Boston to Austin
Charleston to Chicago
Cleveland to Las Vegas

Baltimore to Seattle
Chicago to Los Angeles
Columbus to Oakland

Read Next: Thanks Brexit! Here’s How Much Cheaper It Is for Americans to Visit the UK Now

Spirit Airlines

On select dates over the next month or two, Spirit has some super cheap fares. Availability is extremely limited, and tickets need to be booked by October 6. And remember, Spirit is loaded with fees confronting passengers at every turn. The prices listed below are for non-members of Spirit's $9 Fare Club; members (who pay an annual fee of $60) can generally save about $10 per flight.

Atlanta to Atlantic City
Atlanta to Cleveland
Atlanta to New Orleans
Baltimore to Boston
Baltimore to Minneapolis
Baltimore to Orlando
Boston to Detroit
New Orleans to Chicago
Dallas to Denver
Detroit to Boston

Atlanta to Houston
Baltimore to Fort Lauderdale
Boston to Dallas
Chicago to Boston
Dallas to San Diego

Atlanta to Las Vegas
Chicago to Orlando
Dallas to Las Vegas
Dallas to Myrtle Beach
Fort Lauderdale to Philadelphia