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Need to fly soon? Last minute flights to Denver are available year-round, especially on high-frequency domestic routes. Carriers like Southwest, Frontier, and Spirit often release last-minute deals to fill remaining seats. Use flexible date search on Triwize to compare same-week fares and secure the best available price.

Nonstop flights from Dallas/Fort Worth (DFW) to Denver (DEN) take approximately 2 hours to 2 hours 15 minutes. American Airlines offers the most frequent nonstop service from DFW, with Southwest, Frontier, and United also operating this route. One-way fares from Dallas to Denver typically start from around $59-$110 when booked 3-5 weeks in advance. The cheapest months are May, September, and October.

Nonstop flights from Seattle-Tacoma International Airport (SEA) to Denver (DEN) take approximately 2 hours 30 minutes to 2 hours 45 minutes. Alaska Airlines, United, Southwest, Delta, and Frontier all serve this route, making it one of the most competitive West Coast corridors into Denver. Fares start from around $79-$130 one-way when booked in advance.

Washington DC is served by three airports offering flights to Denver. From Reagan National (DCA), American and Southwest offer nonstop service (~3h 20min). From Dulles (IAD), United operates nonstop flights (~3h 30min). From Baltimore/Washington (BWI), Southwest is the primary carrier. Fares from DC to Denver typically start from $89-$150 one-way when booked in advance.

American Airlines operates nonstop flights to Denver from Dallas (DFW), Charlotte (CLT), Miami (MIA), Philadelphia (PHL), New York (JFK), and other hubs. To find the cheapest American Airlines flights to Denver, search with flexible dates on Triwize or American's website, look for Basic Economy fares (restricted baggage applies), and book 3-5 weeks ahead domestically. AAdvantage members get access to exclusive sale fares — membership is free.

Southwest Airlines is one of the most active carriers at Denver International Airport, operating nonstop flights from dozens of US cities including Chicago Midway (MDW), Dallas Love Field (DAL), Los Angeles (LAX), Phoenix (PHX), Las Vegas (LAS), San Diego (SAN), Seattle (SEA), and Houston (HOU). Southwest fares do not always appear on third-party booking platforms, so check Southwest's website directly or use Triwize to compare available options.

Nonstop flights from Chicago O'Hare (ORD) to Denver (DEN) take approximately 2 hours 20 minutes to 2 hours 30 minutes. United and American operate nonstop service from ORD. From Chicago Midway (MDW), Southwest and Frontier offer competitive nonstop fares. Flights from Chicago to Denver are among the most frequent domestic routes into DEN, with multiple daily departures. Fares from Chicago to Denver start from around $69-$120 one-way.

Nonstop flights from Denver (DEN) to Chicago O'Hare (ORD) take approximately 2 hours 20 minutes to 2 hours 30 minutes, and to Midway (MDW) a similar time. United, American, Southwest, and Frontier all serve this route regularly. One-way fares from Denver to Chicago start from around $69-$120 when booked 3-5 weeks ahead. Midweek departures on Tuesdays and Wednesdays typically offer the lowest prices.

Nonstop flights from Denver (DEN) to Phoenix Sky Harbor (PHX) take approximately 1 hour 30 minutes, making it one of the shortest major routes out of Denver. Southwest, American, Frontier, and United all operate high-frequency service on this corridor. One-way fares from Denver to Phoenix start from around $49-$89 when booked in advance, making it one of the most affordable routes from Denver.

Nonstop flights from Minneapolis-Saint Paul International Airport (MSP) to Denver (DEN) take approximately 2 hours to 2 hours 15 minutes. Delta, United, and Sun Country Airlines all serve this route. Fares from Minneapolis to Denver typically start from around $69-$120 one-way. Delta operates the most frequent nonstop service given Minneapolis is a major Delta hub.

Both Chicago O'Hare (ORD) and Chicago Midway (MDW) offer nonstop flights to Denver. O'Hare provides more airline options (United, American, Frontier) and more daily departures. Midway is the better choice if flying Southwest for its two free checked bags and competitive fares. Total flight time is similar from both airports — approximately 2 hours 25 minutes. Choose based on which airport is more convenient to your location in Chicago.

Nonstop flights from Boston Logan International Airport (BOS) to Denver (DEN) take approximately 4 hours to 4 hours 15 minutes. United, JetBlue, Southwest, and Delta operate nonstop service on this route. JetBlue and Southwest typically offer the most competitive base fares from Boston. One-way prices start from around $89-$150 when booked 3-5 weeks in advance. The cheapest months are May, September, and October.

Nonstop flights from Denver (DEN) to Houston are available to both George Bush Intercontinental Airport (IAH) and William P. Hobby Airport (HOU). To IAH, United operates frequent nonstop service taking approximately 2 hours 30 minutes. To HOU, Southwest offers nonstop flights of a similar duration. One-way fares from Denver to Houston start from around $59-$110 when booked in advance.

Nonstop flights from Denver (DEN) to Los Angeles (LAX) take approximately 2 hours 20 minutes to 2 hours 30 minutes. United, Southwest, Delta, Frontier, and American all serve this popular route. Fares from Denver to Los Angeles start from around $59-$100 one-way when booked 3-5 weeks ahead. Frontier and Southwest often offer the lowest base fares, though Frontier charges for carry-on bags on lowest tiers.

Nonstop flights from Denver (DEN) to London Heathrow (LHR) are operated by United Airlines and British Airways, taking approximately 9 hours to 9 hours 30 minutes westbound and around 9 hours 30 minutes to 10 hours eastbound. Round-trip economy fares typically range from $600-$1,100 when booked 2-4 months in advance. Business class fares range from approximately $2,400-$5,000 round-trip.

Nonstop flights from Denver (DEN) to Portland International Airport (PDX) take approximately 2 hours 15 minutes to 2 hours 30 minutes. Alaska Airlines, Southwest, United, and Frontier all serve this route. Alaska Airlines offers the highest frequency from Denver to Portland. One-way fares typically start from around $69-$120 when booked 3-5 weeks ahead.

Nonstop flights from Denver (DEN) to Washington DC are available to Reagan National (DCA), Dulles (IAD), and Baltimore/Washington (BWI). To DCA, American and Southwest offer service (~3h 20min). To IAD, United operates nonstop flights (~3h 25min). To BWI, Southwest is the primary nonstop carrier. Fares from Denver to Washington DC start from around $89-$150 one-way when booked in advance.

Nonstop flights from Denver (DEN) to Detroit Metropolitan Airport (DTW) take approximately 2 hours 45 minutes to 3 hours. Delta, Southwest, and United operate service on this route. Delta, given its Detroit hub, offers the most frequent nonstop departures. One-way fares from Denver to Detroit start from around $79-$130 when booked 3-5 weeks in advance.

Nonstop flights from Denver (DEN) to Philadelphia International Airport (PHL) take approximately 3 hours 30 minutes to 3 hours 45 minutes. American Airlines operates the most frequent nonstop service, as Philadelphia is a major American hub. Southwest and Frontier also serve this route. One-way economy fares from Denver to Philadelphia typically start from around $79-$140 one-way when booked in advance.