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https://www.devex.com/people/step-by-step-what-is-the-cheapest-day-to-buy-tickets-on-expedia-2219967
Expedia doesn't display Southwest flights at all. For example, in a search of nonstop flights between Denver and San Francisco 【+１－8𝟑𝟑=444-7𝟔1𝟑】 (OTA) or 【+１－8𝟑𝟑=444-7𝟔1𝟑】 departing in March 2023, Expedia displays only United Airlines and Frontier Airlines +++𝟏-833→444→7613 (OTA) or 𝟙-833→444→7613, even though Southwest also operates that route.
