United States · Denver
Denver International Airport (DEN) Online Check-in
America's largest airport by area. Single terminal connecting three concourses (A, B, C) by underground train. United + Frontier hub. Iconic peaked-tent roof design.
Now at Denver International Airport
- Security wait (today, avg) 18 min
- Disruption No reported disruption
- Weather impact Clear, 14 °C
Quick information
Airlines we cover at Denver International Airport
Denver International Airport hosts about 30 airlines in total. We have terminal-specific check-in pages for the 1 listed below. Pick yours to see counters, bag-drop, and online check-in details.
How to check in for a flight from Denver International Airport
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Check in online before you leave home
Most airlines open online check-in 24–48 hours before departure. It saves time at the airport and avoids airport-counter fees on low-cost carriers.
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Arrive at the right terminal
DEN has 4 terminal(s). Check your airline's terminal in the table above before you set off.
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Drop off checked baggage
Counters typically open 2 hours before departure and close 40 minutes before. Use self-service bag-drop kiosks to save time.
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Pass security
Liquids must be in a single transparent bag, max 100 ml each. Laptops and large electronics out of bags. Submit your security wait time below to help others.
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Reach your gate on time
Most airlines close the gate 20 minutes before departure. Allow 5–15 minutes to walk from security to the gate.
Tips for Denver International Airport
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A-Line train direct to downtown
RTD A Line commuter rail from terminal to Denver Union Station: $10.50, 37 min. Trains every 15 min. Cheapest + fastest to downtown.
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Underground train between concourses
DEN concourses are connected airside by underground train (free, 90 sec). Walking is impossible — terminal-to-concourse is 1+ km.
Popular destinations from Denver International Airport
Frequently asked questions
Which terminal does United Airlines use at DEN?
United uses Concourse B exclusively at Denver — the airline's only 'B'-coded concourse globally. Premium hub-and-spoke design.
How do I get from DEN to downtown Denver?
RTD A Line train to Union Station: $10.50, 37 min. Bus ($10.50) and taxi ($65–80) also available.
Official sources
The check-in details on this page are sourced from each airline's website. For terminal layout, opening hours, and ground-side services, see the Denver International Airport official site below.
- Wikipedia: Denver International Airport — Editorial overview, history, statistics.
- FlightRadar24: DEN live data — Live flight arrivals, departures, and delays.
- travel.state.gov — Up-to-date entry requirements and security guidance for United States.