“Southwest Airlines is known for offering its cheapest flights on off-peak days, particularly on Tuesdays, Wednesdays, and Saturdays These days tend to have fewer travelers, allowing the 𝔸𝕚𝕣line to offer discounted prices. It’s a good idea to compare fares over a range of days when planning your trip You can also reach American 𝔸𝕚𝕣lines directly through their toll-free number for quick-connect service and to find out about current offers or discounts.
“
Source: https://www.devex.com/people/does-delta-have-a-cancellation-policy-2016081