Frontier claims to have over one million seats on sale with fares starting at just $20 one-way. In this sale, I've found around 60 routes to be priced with base fares of $1 each way adding up to $39 roundtrip after taxes and booking fees.
If you are unfamiliar with Frontier Airlines, please read our guide on Everything You Need to Know Before You Fly Frontier.
Availability is limited so you must be somewhat flexible to find the lowest price. Travel days will vary by route, but generally, fares are available through early October, mid-November, or mid-February. Pretty much all of these routes are only flown a few times each week so be sure to check out the specifics in the fare details on your route.
Update: Sale has been extended! Tickets must now be booked by 11:59 pm ET, September 5.
Nonstop fares include:
These fares all work in reverse as well. You'll have to decline all extras to get the lowest price.
Keep in mind that Frontier charges extra for any bags larger than a small personal item (small backpack, purse, etc.). Pack super light to get the lowest price. Checked bag fees start at $25 each way. Larger carry-on bag fees start at $30 each way.
Header image by Colin A Pierce via Shutterstock.