Flights

The sale ends on Thursday.

For anyone considering a late summer or fall trip, Frontier Airlines is offering flights for as little as $19 this week, but travelers will need to act fast.

The Denver-based budget airline launched a fare sale on Tuesday for travel through Oct. 7, which ends at 11:59 p.m. ET on Thursday. Two million seats are up for sale, according to the airline.

Fares from Boston include $19 to Charlotte, Raleigh, Cincinnati and Philadelphia, $49 to Orlando, $69 to Dallas and $89 to San Juan.

The discounted fares apply to nonstop travel Monday through Thursday and Saturday. Tickets must be purchased at least seven days before travel and blackout dates are August 29 and September 2 and 3. There are exceptions for Las Vegas, Florida and international travel, which are listed on the company’s website.

In addition, travelers can enter a sweepstakes to win 1 million Frontier miles – enough for up to 100 flights, according to the airline. Travelers must register by Thursday and the winner will be chosen at random. Sweepstakes entrants must be members of the free Frontier miles program.

“These miles can be used for flights to destinations across the country, the Caribbean and beyond and will create countless memories for our lucky winner and their loved ones!” said Tyri Squyres, vice president of marketing for Frontier Airlines, in a statement.

In May, Frontier announced “The New Frontier,” with transparent pricing and no change or cancellation fees.

Tickets can be purchased at flyfrontier.com.