<human>:  What airlines offer the lowest fares for an upcoming flight?
<bot>: The best way to find airlines with the lowest fares for an upcoming flight is to compare prices across multiple airlines. There are various online search engines and travel websites that can help with this, such as Skyscanner, Expedia, and Kayak. These sites will search across many different airlines and present an overview of available flights and their respective fares, allowing you to find the lowest possible price.