Allegiant adding flights from MT to Oakland CA Jan 24 02:25 PM US/Eastern (AP) - Allegiant Travel Co. is adding another destination for flights from Montana. The airline announced Tuesday it is adding nonstop flights from Billings, Bozeman, Kalispell and Missoula to the Oakland/San Francisco area starting in late April. Allegiant Air says it will have flights from Billings to Oakland International Airport on Thursdays and Sundays starting on April 26, while its Bozeman, Kalispell and Missoula flights will be on Fridays and Mondays, starting on April 27. Allegiant flies MD-80 jets that seat 150 passengers. Some initial seats will cost $39.99 each way, including taxes and airport fees.