7 Low-Fare Airlines You've Probably Never Heard Of

Aer Lingus is the second largest airline in Ireland and flies out of 11 major US cities, including Chicago and Orlando. Travelers can get great deals to cities in Ireland, Northern Ireland, and other places in the United Kingdom.

Iberia is the flag carrier airline of Spain and offers affordable flights out of the US and Puerto Rico to Spain and Europe. Additional regions include the Middle East, Asia, and Africa.

Allegiant Air is a low-cost, domestic American airline with routes from 20 US airports. Flights from Los Angeles, Las Vegas, Phoenix, and Florida travel to the most cities.

WOW Air is a low-cost carrier stationed in Reykjavík, Iceland, that's quickly becoming a popular airline. Its truly wow-worthy fares to Iceland and Europe from seven major US cities justify its name.

Frontier Airlines is a low-cost airline based in Denver with over 65 flights within the US, Mexico, and the Caribbean. Some domestic flights begin at $29 during its sales.

According to its site, Spirit Airlines is the leading ultra low-cost carrier in the US, Caribbean, and Latin America. It flies to 59 destinations within those regions and offers impressive "Bare Fares."

Sun Country Airlines is a Minneapolis-based airline that operates in the US, Mexico, Costa Rica, and the Caribbean. Travelers can find some affordable domestic flights during its seasonal sales.