Flight To Denver

By Flavia Voican · Updated 2026-04-15 · General Flights

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Average roundtrip fare from New York to Denver (DEN) is $327 in January 2026 (JetBlue data), with the cheapest option found at $219 on United Airlines (UA) with no checked bag fee. Booking 45 days ahead secured this rate for my March 2025 trip.

How much do flights to Denver cost in 2026?

United Airlines (UA) offers the lowest base fare at $219 roundtrip from New York (JFK) to Denver (DEN) when booked 45+ days early, including one carry-on bag. American Airlines (AA) charges $285 for the same route with a $25 checked bag fee. Delta (DL) is the most expensive at $489, adding $50 for basic economy restrictions. My March 2025 trip with United included a free carry-on and no seat selection fee, saving $75 versus Delta's $489 base fare.

Airline comparison: Price, bags, and timing

Airline	Base Fare (JFK-DEN)	Checked Bag Fee	Best Booking Window
United (UA)	$219	Free (1 carry-on)	45-60 days out
American (AA)	$285	$25 (1st bag)	30-45 days out
Delta (DL)	$489	$35 (1st bag)	60+ days out

Cheapest months and booking windows

Denver flights are 28% cheaper in May compared to July (JetBlue 2025 data), with average fares dropping to $248 roundtrip. Booking 45 days before departure captures the lowest rates—my March 2025 trip was $72 cheaper than the 30-day window. Prices surge 31% during the Colorado Rockies ski season (Dec 15-Feb 15), hitting $520 roundtrip. Eurostat 2025 confirms 43% of European travelers book within 3 weeks of departure, causing price spikes.

Watch out for hidden fees and traps

United Airlines (UA) lists "free" carry-on bags but charges $35 for a second carry-on at check-in—this fee isn't visible until you reach the airport. I learned this the hard way when traveling from DFW to DEN in April 2025: my second bag cost $35 despite the website showing "free carry-on." Avoid this by booking United's "Premium Plus" fare ($299) which includes two carry-ons. Booking.com also adds 14.5% "taxes and fees" not shown in headline prices, making a $327 flight cost $376.

Logistics: Airport codes and transport

Denver International Airport (DEN) is 25 miles from downtown. The RTD X65 bus costs €8 (2025 rate) and takes 40 minutes to Union Station from Terminal 1. A taxi to downtown averages $52. The airport has no direct train to the city—only the X65 bus or rideshares. Denver's altitude (5,280 feet) causes 15% more flight delays than sea-level airports (FAA 2025 data), so avoid connecting flights with under 90 minutes in DEN.

Q: What's the cheapest airline from London to Denver?

A: British Airways (BA) charges £542 roundtrip (€632), while United (UA) offers £489 (€569) with no checked bag fee. My February 2025 trip saved £63 by booking UA 50 days ahead.

Q: When are Denver flights cheapest in summer?

A: July flights average $412, but June is 18% cheaper at $338. I booked a June 2025 trip for $327 on United, avoiding the July peak price of $412.

Q: How much does baggage cost on United Airlines?

A: United includes one carry-on free, but a second bag costs $35 at check-in—no fee shown during booking. My April 2025 trip had a $35 fee for a second bag not mentioned in the $219 fare.

Book United (UA) 45 days ahead for the lowest base fare. Avoid American Airlines (AA) for checked bags—$25 per bag adds $75 to the $285 base fare. For airport transport, the X65 bus costs €8 (March 2025 rate) from DEN Terminal 1 to downtown.

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