$100 Cheap American Airlines flights Harlingen (HRL) to Denver (DEN)

Scoring cheap one-way American Airlines flights from HRL to DEN from $100 on Expedia is a breeze — just filter by “Price (lowest to highest).” Or check out our budget-friendly return fares from $198 for your next getaway.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

January is one of the cheapest months to fly to Denver with American Airlines. You could also find great deals on one-way and return fares in November.

For cheap American Airlines fares from Valley Intl. Airport (HRL) to Denver Intl. Airport (DEN), start searching one to three months before your intended departure. Securing domestic flights 34 to 86 days in advance could save you 25% compared to booking just 6 to 12 days ahead. The day you book can also impact the overall cost. Sunday tends to be the most affordable, while Monday is often the most expensive for domestic flights. You can save 6% on average by booking your journey on a Sunday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC’s global airline sales database.

To figure out if there’s a direct journey from HRL to DEN with American Airlines or any other carriers, check the “Nonstop” filter when looking for flights.

Sort your results by “Early Morning” and “Morning” to see the earliest departures from HRL to DEN. Heading off early means you’re less likely to experience cancellations.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.

American Airlines flights from Valley Intl. Airport (HRL) to Denver land at Denver Intl. Airport (DEN). This is the main entry point here.

Changes are often free within 24 hours of making your booking, but your airline may charge a fee after that time. For more information about altering your reservation, head to your “Trips,” select your flight and click on “Manage Booking.” If you’d like the freedom to change your itinerary without being charged, tick the “Changes included” or “No cancel fee” filter when planning your trip.