Least expensive Days to Fly and Best Time to Purchase Airline Tickets. For causes I never fairly understood, every time I attempted to book a domestic flight in a foreign country, the costs were all the time exorbitant. IATA introduced that as of June 1, 2008, IATA-member airways will no longer problem any paper tickets. In this new search, the most cost effective flight on Avianca is 116,280 COP and the most affordable flight on LAN is 173,820 COP.
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