Cheap flights from Denver (DEN)

Mountain-state mega-hub with the largest airport land area in the US

Denver International sits 40 km northeast of downtown Denver and ranks among the busiest airports in the world by passenger volume. United operates one of its largest hubs here alongside a major Southwest base and a fast-growing Frontier headquarters. The airport is a key transcontinental connection point with nonstops to Tokyo, London, Frankfurt and Munich, plus dense domestic coverage across the Rockies and West Coast.

Why search this airport on Flightmussy

Airlines flying from Denver (DEN)

Major carriers: United, Southwest, Frontier, American Airlines, Delta. Low-cost carriers: Southwest, Frontier, Spirit, Sun Country.

Popular destinations from Denver (DEN)

Frequently asked questions

What is the cheapest month to fly from Denver?
Mid-January through February and the post-Labor Day window in September are typically the cheapest times to fly out of DEN, especially on Frontier and Southwest. Flightmussy's 12-month fare heatmap surfaces the exact week prices bottom out for the route you're searching.
Which airlines fly out of DEN?
United runs a major hub at Denver, joined by Southwest's large base, Frontier's headquarters, plus American, Delta, Spirit, Sun Country and Alaska. International service includes British Airways, Lufthansa and Edelweiss. Flightmussy compares every carrier without hiding LCC fares.
How far is DEN from downtown Denver?
Denver International sits about 40 km northeast of downtown — one of the longer airport-to-city distances in the US. The RTD A-Line commuter rail runs from the terminal to Union Station in 37 minutes, and rideshares typically take 30-45 minutes depending on traffic on Peña Boulevard.
Are there direct flights from DEN to Europe?
Yes, United operates daily nonstops to London, Frankfurt and Munich, while Lufthansa, British Airways and Edelweiss add their own services to FRA, LHR and ZRH. Flightmussy compares all transatlantic options side-by-side and the 12-month heatmap pinpoints the cheapest departure week.

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About Flightmussy

Flightmussy is a free flight meta-search built by one person in Oslo. No signup, no ads, no tracking, no email capture. Compare fares across airlines and see 12 months of prices at a glance — including low-cost carriers Google Flights often deprioritises (Widerøe, Wizz Air, Norwegian, Ryanair). Pay with a card at the airline, or use the Crypto button on any result to check out in BTC, ETH, USDT, BNB or AVA via Travala.

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