Southwest is having a fare sale to celebrate flying into LaGuardi starting June 28. Flights from many cities across the country into New York are $99 or less one way.

Don’t delay if you are considering a summer vacation that involves air travel. The best flights will be gone in a few hours.

These fares are good everyday but Friday and Sunday.

Caveats: purchase by April 20, 2009 and travel between June 29 through August 13, 2009. Blackout Dates Apply: July 2 – July 6, 2009. Fares are not combinable with Senior Fares.

UPDATE: Virgin America is having a fare sale, too.  Prices are for travel from April 14 to June 10, and Aug. 25 to Oct. 14. Purchase tickets by April 20. Samples fares include LA/SD/OC to Seattle for $59 to $69 and Boston to LA for $109. Expect higher fares are for travel on Mondays, Thursdays, Fridays and Sundays.