Best Flights starting from $330
from$330economy
St Louis (STL)
Sat, Feb 28
Roundtrip
Denver (DEN)
Sun, Mar 1
Fields updated — click View Prices to search ↑
Other Destinations
St Louis (STL) to Orlando (MCO) in February from $56
From $56
St Louis (STL) to Dallas (DFW) in February from $101
From $101
St Louis (STL) to Phoenix (Any) in February from $149
From $149
St Louis (STL) to San Diego (SAN) in February from $165
From $165
St Louis (STL) to Memphis (MEM) in February from $218
From $218
St Louis (STL) to Miami (MIA) in February from $235
From $235
Flights from Other Cities
Kansas City (MCI) to Denver (DEN) in February from $84
From $84
Chicago (ORD) to Denver (DEN) in February from $84
From $84
San Jose (SJC) to Denver (DEN) in February from $107
From $107
Cincinnati (CVG) to Denver (DEN) in February from $108
From $108
Sioux Falls (FSD) to Denver (DEN) in February from $124
From $124
Fargo (FAR) to Denver (DEN) in February from $139
From $139
✈️ Flight Guide: St Louis (STL) → Denver (DEN)
Complete travel information for your February journey
Departing from St Louis (STL) FAQs
To find the cheapest economy flights from Denver International Airport (DEN) this month, compare prices across low-cost carriers and major OTAs, set fare alerts, and be flexible with days and times — midweek red-eyes often cost less. Use filters for 'economy' and 'basic economy' and consider nearby airports such as Colorado Springs or Fort Collins for alternative low-cost departures. Book 3–8 weeks in advance for domestic travel and 2–4 months for international economy seats to maximize savings.
Baggage rules for economy class on flights departing Denver International Airport (DEN) vary by airline and fare type; many basic economy fares do not include a checked bag while standard economy often includes one checked bag on international carriers. Always check your airline’s carry-on and checked baggage allowances before you pack, and buy checked baggage online in advance for lower fees. For connections, confirm baggage transfer rules if you book separate tickets.
December often features seasonal sales and holiday deals on economy routes from Denver International Airport (DEN), especially for round-trip flights booked several weeks in advance and for January travel. Airlines and OTAs run promotions to fill seats after Thanksgiving and around Cyber Monday; monitor fare alerts and subscribe to airline newsletters to catch flash sales. Remember that holiday peak dates (mid-December to early January) usually command higher fares, so aim for travel in early December or late January for best economy prices.
Popular destinations with frequent budget-friendly economy flights from Denver International Airport (DEN) include Los Angeles, Las Vegas, Phoenix, Dallas-Fort Worth, Chicago, and Salt Lake City. These routes often feature multiple daily flights by legacy and low-cost carriers, driving competitive pricing and lower economy fares. For beach or international economy bargains, also check seasonal nonstop or one-stop routes to Mexico City, Cancun, and major hubs like Atlanta.
For economy class domestic flights departing Denver International Airport (DEN), arrive at least 90 minutes before departure to allow time for check-in, security, and potential lines; add more time during holiday seasons and early morning peaks. If you need to check bags or expect TSA PreCheck lines to be long, plan for 2 hours. For international economy departures, arrive 2.5–3 hours ahead to clear security and immigration procedures.
Yes — flying midweek in March often yields cheaper economy fares from Denver International Airport (DEN) because Tuesdays and Wednesdays tend to be lower-demand days outside spring-break windows. For March travel, avoid the week of spring break for major universities and consider late-March weekday departures to secure budget-friendly economy seats. Use fare comparison tools and set price alerts to lock in March deals as they appear.
Arriving at Denver (DEN) FAQs
Cheapest Economy Fare (ECO) indicates the lowest-cost economy class ticket available for your route and date, typically with more restrictions like no seat selection and limited or no checked baggage. When arriving, expect basic amenities and be prepared to pay ancillary fees for baggage, seat upgrades, or priority boarding. Always read the fare rules on your confirmation and check arrival transfer baggage policies if connecting.
Arrivals on cheapest economy fares into Denver International Airport (DEN) commonly connect travelers to major cities such as Boulder, Colorado Springs, Fort Collins, Aspen, Vail, and nearby regional hubs. Travelers often use ground transport or short connection flights to reach mountain resorts, ski towns, and urban centers in Colorado. Plan transfers in advance to avoid higher last-minute ground transportation costs.
In July, arrivals on the cheapest economy fares (ECO) may coincide with peak summer travel, so expect crowded baggage carousels and longer ground transportation waits at Denver International Airport (DEN). If arriving on a low-cost economy ticket, pre-book shuttle services or car rentals to lock in lower rates and consider public transit options like the A Line train for faster transfer to downtown Denver. Allow extra time for connections and pack essentials in your carry-on in case checked bags are delayed.
Yes, you can connect to other flights after arriving on a cheapest economy (ECO) ticket, but be mindful of tight connection times and luggage transfer rules — basic economy may not allow changes or rebooking options. If you have separate tickets, purchase adequate layover time and consider baggage recheck and terminal transfer times at Denver International Airport (DEN). For peace of mind, choose longer connection windows or consider travel insurance.
Cheapest ground transportation options from Denver International Airport (DEN) include the A Line commuter rail to downtown Denver, shared airport shuttles, public buses, and rideshare services that can be cheaper when shared or during off-peak hours. For mountain destinations, look for booked shuttle services that serve towns like Vail and Aspen; advance booking often secures the best price. Compare costs between car rentals and shuttles, and factor in parking or drop-off fees for the most economical choice.
To minimize fees when arriving with a cheapest economy (ECO) ticket in November, pre-pay checked baggage where possible, bring only carry-on-sized items that comply with airline rules, and avoid seat-change fees by accepting standard seat assignments. November offers some off-peak windows before Thanksgiving when fares and ancillary fees decrease, so traveling earlier in the month can lower costs. Also, enroll in loyalty or credit card programs that waive baggage fees to save on arrival expenses.
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Events & Festivals Near Denver That Impact Economy Fares at DEN
High-profile events near Denver International Airport (DEN) — such as the Great American Beer Festival (October), National Western Stock Show (January), Denver PrideFest (June), and fall college football weekends — can create localized fare spikes in economy class. Ski season weekends and music festivals also push prices for mountain-route flights. To avoid higher fares, travel outside event weekends, or book flights and transfers well in advance if attending. CTA: Check Denver’s event calendar before booking to avoid premium economy fares during popular festivals.
Best Time to Fly from Denver International Airport (DEN) for Cheap Economy Fares
The best time to fly from Denver International Airport (DEN) for cheap economy fares is during shoulder seasons (September–early November and January–early March). For domestic economy travel, book 3–8 weeks in advance; for international economy, aim for 2–4 months. Midweek departures (Tuesdays/Wednesdays) and overnight red-eyes often present the lowest fares. Avoid major holiday windows unless you book months ahead. CTA: Use fare calendars and sign up for DEN-specific alerts to identify the best time to fly for your route.
Direct vs Connecting Flights from Denver International Airport (DEN) — Economy Tradeoffs
Connecting flights from Denver International Airport (DEN) often offer cheaper economy fares than nonstop routes because they increase competition and fill smaller, less-popular segments. However, connecting itineraries add travel time and risk of missed connections — especially on basic economy fares that may not protect you across separate tickets. Direct nonstop flights are faster and often worth a modest premium for time-sensitive trips. To save on economy fares while minimizing risk, choose connections with 90+ minute layovers, preferably on the same ticket, and avoid tight banked schedules during winter months when weather delays are common. CTA: Compare direct and connecting DEN options to find the best economy balance for your trip.
Airline Comparison for Economy Fares from Denver International Airport (DEN)
Frontier and Southwest often provide the lowest headline economy fares from Denver International Airport (DEN); Frontier focuses on ultra-low-cost basic fares with many ancillaries, while Southwest offers two free checked bags but fewer change fees for flexible travelers. United, American, and Delta provide broader network options and more frequent international connections from DEN with variable economy pricing. For the cheapest overall price, compare basic economy vs standard economy and factor in baggage and seat fees. Use each airline’s fare calendar and loyalty benefits to choose the most cost-effective carrier for your route. CTA: Compare current economy fares across carriers from DEN to find the cheapest option.
Seasonal Travel Tips for Economy Travelers at Denver International Airport (DEN)
Winter at Denver International Airport (DEN) requires extra time for snowy conditions; arrive earlier and allow extended connection windows when flying cheapest economy fares. Summer sees peak leisure demand — book early and consider alternative airports for lower fares. Shoulder seasons (spring and fall) provide the best balance of price and availability for economy travelers. Always verify baggage rules, pre-book ground transfers during busy seasons, and use fare alerts to track seasonal drops. CTA: Prepare for season-specific conditions and sign up for DEN fare alerts to optimize your cheap economy travel plans.
Flight Times & Schedules from Denver International Airport (DEN) — Economy Class
Flight times from Denver International Airport (DEN) vary by destination: to the West Coast (Los Angeles, Las Vegas) expect 2–3 hours; to the East Coast (New York, Boston) expect 3.5–4.5 hours; to major southern hubs (Dallas, Atlanta) expect 2–3 hours. Late-night and red-eye economy flights can reduce fares and are commonly scheduled midweek, while weekend peak times show higher demand and fewer cheap economy seats. For international routes to Mexico or Central America, plan 4–6 hours depending on stops. Always check airline schedules for seasonal nonstop routes and use time-of-day modifiers when searching for the cheapest economy options.
Cheap Flights from Denver International Airport (DEN) — Economy Strategies
Finding cheap economy flights from Denver International Airport (DEN) requires a mix of flexibility, timing, and tool selection. Primary strategies include using fare alerts, searching flexible-date calendars, comparing low-cost carriers like Frontier and Southwest, and checking nearby airports (Colorado Springs, Eagle County, Grand Junction). Use location-based modifiers when searching (e.g., 'cheap flights from Denver to Los Angeles economy') and set alerts for price drops. For best results, book domestic economy 3–8 weeks out and international economy 2–4 months in advance. CTA: Start a fare alert for your DEN route today to lock in the lowest economy fare.