Avelo Airlines promotes 65% airfare discounts for fall travel from New Haven. But travel plans will have to come together in a hurry.

Low-cost Avelo Airlines is making it even less expensive to fly out of Tweed New Haven Airport this fall, with an offer to slash airfares by 65% between Sept. 1 and Nov. 9.

But travel plans will have to come together in a hurry because the flights must be booked by 2:59 a.m. on Thursday.

“The fall period is traditionally for the travel industry a softer period for bookings simply because you have folks ramping back up to the school year and people going back to work,” Jim Olson, an Avelo spokesman, said.

“We think this 65% off fare will give some folks some inspiration to book a trip during that traditionally soft leisure travel period.” he said.

To qualify for the discount, flights must be booked through the airline’s website, aveloair.com using the promotional code “FLYLATER.”

Olson said Avelo bookings out of Tweed and along East Coast airports have been strong this summer. The airline, which launched its first flight out of Tweed in November, said it is using the sale to be “proactive” about the anticipated lull in the fall.

The 65% discount announced Monday follows 30% and 50% discounts earlier this year as inflation pushed up the cost of summer travel amid strong passenger demand and higher fuel costs.

[ Low-cost Avelo Airlines offers sale to stand out from competitors as the cost of summer air fares rise ]

Low fares are just one part of Avelo’s strategy, balanced by a menu of fees that gets tacked on to the cost of flying on the airline. There are fees for, among others, priority seating, checked bags, carry-on overhead bags and bringing a pet into the cabin.

Avelo serves 14 destinations from Tweed on Boeing 737 jetliners: Charleston, Myrtle Beach and Hilton Head, South Carolina; Fort Lauderdale, Fort Myers, Orlando, Sarasota/Bradenton, Tampa and West Palm Beach, Florida; Nashville, Tennessee; Raleigh/Durham and Wilmington, North Carolina; Savannah, Georgia; Washington D.C.; and Baltimore, Maryland.

Kenneth R. Gosselin can be reached at kgosselin@courant.com