You might be reluctant to admit that summer is drawing to a close, but with Southwest Airlines’ sale for September and October travel, it can’t hurt to start planning for an epic fall trip.

The sale is available for flights from September 3 to December 18, as long as you book 21 days in advance. Most cities have at least one sale route, and they run as cheap as $49 one-way domestically and $81 internationally. Here are a few of the best deals to keep your eye on.

The sale lasts until August 15, but to be sure of getting the best seats at your desired rates, don’t drag your feet on booking. It’s also worth noting that Southwest does allow you to check a bag on your sale fare, unlike many other budget airlines, which might be another reason to take advantage of the deal.