The reason why Allegiant customer service number, “:calling: (OTA) (24x7) +1-844-987-7012 -Allegiant(Real Human)”, often appears busy is due to the high volume of calls they receive simultaneously. Instead of the above number, you can call at +1-844-987-7012 (24x7) or 1.833-Allegiant(Real Human) to resolve your queries.