Flying from Denver: what you need to know
Denver International is the third-busiest airport in the U.S. by passenger traffic, and that volume drives serious fare competition. United runs a hub here, Southwest has a large operation, and Frontier — headquartered in Denver — uses DEN as its primary base. Three-way competition on most domestic routes keeps prices honest.
The domestic fare landscape from Denver is genuinely excellent. Frontier often launches routes at $29-49 one-way to mid-tier cities, which forces United and Southwest to match or come close. Phoenix, Las Vegas, Los Angeles, and Dallas are all competitively priced year-round.
International options have expanded significantly. United added nonstops to London, Frankfurt, Munich, and Tokyo. British Airways and Lufthansa also serve DEN. The London route is the standout — it regularly dips below $500 roundtrip, which is impressive for a mid-continent departure.
Mexico is an increasingly strong market. Aeromexico, United, Southwest, and Frontier all compete on routes to Cancún, Cabo, and Mexico City. Roundtrips to Cancún regularly break $200.
DEN's unique challenge is the ski season spike. December through March, every inbound flight from the coasts is packed (and priced accordingly), but outbound international flights from Denver get cheaper during this window because locals are skiing, not traveling abroad. If you're a Denver resident looking at Europe or Asia, January-February is when to strike.
The airport itself is massive — budget 45 minutes from security to gate if you're in the international terminal.