Will flying cost less this Labor Day weekend?

Flying away for Labor Day weekend?

The online travel agency  CheapOair said last week that its data is pointing to a lower demand -- and possibly some lower prices -- for domestic destinations for Labor Day vacationers.

CheapOair says these are the most  popular U.S domestic fly-tos (Denver tops the list), what the average round-trip fare is for Labor Day weekend, and how the airfare price has changed from the same weekend in 2013 (the percentage of change is in parenthesis):

Denver: $268 (up 40 percent)

Orlando, Fla.: $269 (down 15 percent)

Tampa, Fla.: $276 (down 6 percent)

Washington, D.C.: $289 (down 16 percent)

Boston: $293 (down 32 percent)

Fort Lauderdale, Fla.: $310 (down 26 percent)

Miami: $336 (up 10 percent)

Los Angeles: $339 (down 19 percent)

San Francisco: $354 (down 19 percent)

Seattle: $369 (down 1 percent)

The devil, of course, is in the details: The farther you are from your destination, the more expensive it will be. And what kind of routing is involved? What about departure/arrival days and times go with it?

Consider a quick trip to San Francisco (the Golden Gate Bridge is shown above).

Checking CheapOair at 3:30 p.m. on Aug. 11, there were two round-trip fares between Charlotte (CLT) and San Francisco (SFO) at $436.70, including taxes -- one-stop flights via JetBlue. Both leave Charlotte at a reasonable time: 12:12 p.m. or 4:20 p.m. on Aug. 29; on the way back on Sept. 2, they leave San Francisco at 10 p.m. and 8:45 p.m.

The catch? Your one stop is in Boston, where there's a two-hour layover in either direction... making for an eight-hour flight either way.

That said, Labor Day is considered a "drive" holiday, and if airline demand is indeed down this year -- and you don't mind taking a longer, round-about, one-stop journey -- you may find deals out there from discounters or  airlines.