Allegiant flights — Denver, CO

Last updated: September 24, 2026

What affects the price

Flight prices shift based on a few key factors. How far ahead you book is usually the biggest one, as seats tend to fill up and get more expensive as the departure date nears. Choosing mid-week travel instead of weekends can often save you money, and flying during off-peak hours helps too. Demand is a major driver, so big holidays or local events can push costs higher. We look at all the available options to find a deal that fits your needs. Exact pricing confirmed free on the call.

About this service

Allegiant focuses on connecting smaller cities to popular vacation destinations, often using a low-cost model. The base fare is usually lower, but extras like seat selection, carry-on bags, and checked luggage typically cost more. Because they often fly specific routes on limited days, flexibility with your travel dates can help you find a better value. We can help you weigh these extras against your total budget. Exact pricing confirmed free on the call.

Frequently asked in Denver

Also serving nearby: Aurora · Thornton · Centennial · Westminster · Lakewood

All cities in Colorado →

More on this: TSA travel tips — security screening and what to bring.

Service area details

Serving all of Denver — population 716,577; about 4,681 residents per square mile across 153.1 sq mi. ZIP codes covered include 80201, 80202, 80203, 80204, 80205, 80206, 80207, 80208.

Neighborhoods served in Denver: LoDo (Lower Downtown), Capitol Hill, Cherry Creek, RiNo (River North Art District), Highlands — and every surrounding area.