Best Flights starting from $80
from$80economy
Ontario (ONT)
Sat, May 2
Roundtrip
Denver (DEN)
Sat, May 9
from$90economy
Ontario (ONT)
Wed, May 27
Roundtrip
Denver (DEN)
Wed, Jun 3
Fields updated — click View Prices to search ↑
Other Options for This Route
Other Destinations
Ontario (ONT) to Las Vegas (Any) in May from $29
From $29
Ontario (ONT) to Las Vegas (LAS) in May from $88
From $88
Ontario (ONT) to Las Vegas (Any) in May from $88
From $88
Ontario (ONT) to Houston (IAH) in May from $106
From $106
Ontario (ONT) to Atlanta (ATL) in May from $160
From $160
Ontario (ONT) to Orlando (MCO) in May from $160
From $160
Flights from Other Cities
San Diego (Any) to Denver (DEN) in May from $51
From $51
Dallas (DFW) to Denver (DEN) in May from $58
From $58
Portland (PDX) to Denver (DEN) in May from $77
From $77
Miami (MIA) to Denver (DEN) in May from $88
From $88
Tampa (Any) to Denver (DEN) in May from $102
From $102
Kansas City (MCI) to Denver (DEN) in May from $112
From $112
✈️ Flight Guide: Ontario (ONT) → Denver (DEN)
Complete travel information for your May journey
Departing from Ontario (ONT) FAQs
To find the cheapest economy flights from Denver International Airport (DEN) this month, compare fares across low-cost carriers (Frontier, Southwest) and major airlines (United, Delta) using fare comparison tools and flexible dates. Book 21–60 days in advance for domestic U.S. routes, sign up for price alerts, and check midweek departures (Tuesdays/Wednesdays) to score the best deals. Consider nearby departure times and secondary airports like Colorado Springs when searching budget routes.
Denver International Airport (DEN) is a hub for low-cost carriers such as Frontier and Southwest, with consistently cheap economy fares to destinations like Las Vegas, Phoenix, Los Angeles, and Dallas. Routes to leisure hubs (Orlando, Miami) and West Coast cities frequently offer the best deals, especially if you travel during shoulder seasons. Always compare checked baggage and change fees when evaluating economy prices to ensure you get the true cheapest fare.
Yes, Denver International Airport (DEN) often sees seasonal deals tied to ski season (December–March) and summer travel (June–August), with discounted economy fares to ski gateways like Aspen and Vail, and popular summer vacation cities like Los Angeles and Seattle. Airlines frequently run promotions in late fall and early spring—subscribe to newsletters and set alerts for mountain-resort and beach-route sales. For ski trips, consider arriving midweek to save on flights and rental cars.
During peak travel months such as July, expect longer security and check-in lines at Denver International Airport (DEN), typically 30–60 minutes for TSA security during busy periods and up to 90 minutes at peak times like holidays. To avoid stress, arrive 2 hours before domestic flights and 3 hours for international departures; use TSA PreCheck or CLEAR where available to shorten wait times. Monitor real-time airport updates and check airline advisories on busy travel days.
Yes, Denver International Airport (DEN) offers frequent nonstop economy flights to major U.S. cities like Los Angeles (LAX), Las Vegas (LAS), Chicago (ORD/MDW), and New York (JFK/EWR) on both legacy and low-cost carriers. Nonstop fares can be very competitive, especially when airlines discount routes during off-peak days and shoulder seasons. If price is your priority, compare nonstop prices with one-stop itineraries—sometimes a short connection yields significant savings.
From Denver International Airport (DEN), cheap economy fares commonly serve nearby major and popular destinations including Colorado Springs, Boulder, Fort Collins, Aspen, Vail, Salt Lake City, Albuquerque, Phoenix, and Kansas City. These cities are often accessible via short nonstop flights or affordable connecting itineraries, making DEN a convenient gateway for mountain getaways and Western U.S. trips. Use multi-city or open-jaw search options to combine destinations affordably.
Arriving at Denver (DEN) FAQs
'Economy Class - Cheapest Fares (ECON)' refers to the lowest-priced economy fare bucket offered by airlines, typically with restrictions on changes, cancellations, and seat selection. These fares are ideal for budget-conscious travelers looking for the lowest upfront price, but you should account for additional fees like baggage, seat assignments, and in-flight services when comparing total costs.
Expect fees for checked baggage, priority boarding, seat selection, and sometimes carry-on bags depending on the carrier, especially with ultra-low-cost carriers. Always review the fare rules before booking and compare the all-in cost across airlines to ensure the cheapest headline fare remains the best value.
In June, the cheapest economy fares can be found by booking at least 30–60 days in advance for domestic U.S. routes, avoiding peak holiday weekends, and being flexible with departure days and times. Monitor airline flash sales and sign up for fare alerts—June demand for summer travel is high but early planners often find discounted ECON seats.
Travelers arriving on the cheapest economy fares should prepare for potential baggage fees and limited transfer flexibility, especially on itineraries involving different carriers. If you have a tight connection, consider paying for priority services or choosing a slightly higher fare class that includes protected connections and baggage to reduce risk of missed flights.
Major U.S. hubs and popular leisure destinations—Los Angeles, Las Vegas, New York, Orlando, Chicago, San Francisco, and Seattle—often have competitive cheapest economy fares due to high competition and frequent flights. Use multi-airport searches and check both legacy and low-cost carriers to compare true door-to-door costs.
Avoid the cheapest economy fares when traveling during peak holidays, when you require flexible changes or cancellations, need checked baggage included, or have tight connections—upgrading to a refundable or standard economy fare often provides better value and protection. For complex itineraries, buying a fare that includes baggage and flexible rebooking is typically wiser than risking fees and missed connections.
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Events & Festivals Affecting DEN Airfares — Plan Economy Travel Around Major Dates
Major events and festivals can significantly increase economy fares from Denver International Airport (DEN). Locally, Denver’s Great American Beer Festival (October), National Western Stock Show (January), and Denver Film Festival (November) drive demand. Popular destination events—such as South by Southwest in Austin (March), Lollapalooza in Chicago (July), and New Year’s in New York (December)—also push up fares and reduce availability of cheap economy seats. For budget travelers, avoid peak-event weekends or book several months in advance.
Best Time to Fly from Denver International Airport (DEN) in Economy — Seasonality Guide
The best time to fly from Denver International Airport (DEN) in economy is during shoulder seasons—late April to early June and September to early November—when demand drops and airlines offer lower fares. For ski trips, January and February midweeks can yield deals; for beach and family travel, book well in advance for summer months (June–August). Avoid peak holiday windows (Thanksgiving, Christmas-New Year) unless you book early; use flexible-date searches to identify the lowest-priced days to fly.
Direct vs Connecting Flights from DEN — Economy Traveler Considerations
For economy travelers departing Denver International Airport (DEN), nonstop flights provide convenience and reduce the risk of missed connections but can sometimes be pricier than connecting itineraries. Connecting flights often lower upfront fares—especially on long-haul routes—yet may introduce baggage transfer risks and longer total travel time. Evaluate the true cost by adding baggage or change fees, and for tight schedules or winter travel, prefer nonstops or allow longer connection times.
Airline Comparison for Economy Travel from DEN — United, Southwest, Frontier, Delta, American
When choosing airlines for economy travel from Denver International Airport (DEN), consider both the base fare and ancillary fees. United offers extensive hub connections and frequent nonstop options, while Southwest is known for free two-checked-bags on many fares and flexible change policies. Frontier and Spirit provide ultra-low base fares but add fees for carry-ons and seat assignments—making them ideal for travelers who travel very light. Delta and American provide wide network coverage and loyalty benefits but may be pricier unless booked in advance or during sales.
Seasonal Travel Tips for Economy Flyers from DEN — Ski, Summer, Shoulder Seasons
Seasonal planning helps economy travelers get the best value when flying from Denver International Airport (DEN). In winter (Dec–Feb), allow extra time for de-icing and winter delays, and consider refundable or flexible economy fares for weather-prone travel. For spring shoulder seasons (April–May, September–October), take advantage of lower demand and cheaper economy seats while packing layers. Summer (June–Aug) demands early booking for economy fares; for ski season plan for ground transfers to mountain resorts and factor equipment transport into baggage allowances.
Flight Time and Schedules from Denver International Airport (DEN) — Economy Route Durations
Flight durations from Denver International Airport (DEN) vary by destination: West Coast flights to Los Angeles and San Francisco average 2.5–3 hours, Las Vegas is about 1.5–2 hours, Chicago 2.5–3 hours, and New York 3.5–4 hours. Low-cost carriers and legacy airlines often run multiple daily frequencies on popular economy routes, with early-morning and late-evening flights offering the most budget-friendly fares. For tight connections, allow at least 90–120 minutes for domestic transfers at DEN; use airline minimum connection time guidance for itineraries.
How to Find Cheap Flights from Denver International Airport (DEN) — Economy Tips
To secure cheap flights from Denver International Airport (DEN) in economy class, combine flexibility, fare alerts, and cross-carrier comparisons. Use flexible-date calendars, sign up for airline newsletters, and check both low-cost carriers (Frontier, Southwest) and legacy airlines (United, Delta) for overlapping routes. Search alternative nearby airports like Colorado Springs or combine one-ways for lower round-trip pricing. Always compare the total price including baggage and seat fees to identify the true cheapest fare.