United has round-trip flights from Dallas (DFW) to Denver (DEN) for $117-$126, NONSTOP. Flights September to December. Departures on Monday, Tuesday, Wednesday, Saturday, and Sunday. Extended weekends available. Origin/Destination reversible. No Christmas dates available.

United’s “Basic Economy” fares do not allow for a free carry-on bag. Only a personal item (like a small laptop bag) is free. Seats are randomly assigned for free prior to boarding.

The personal item size on United is smaller (9 x 10 x 17 inches) than Frontier or Spirit (8 x 13 x 18 inches).

Read More Nonstop Flights: Dallas to/from Denver $117-$126 r/t [September-December] (No Christmas) – United

Airfare Deals Denver Star Alliance United

Airfare Deals Denver Southwest

United has round-trip flights from Dallas (DFW) to Denver (DEN) for $117-$124, NONSTOP. Flights June to November. Extended weekends available. Origin/Destination reversible. No Thanksgiving dates.

United’s “Basic Economy” fares do not allow for a free carry-on bag. Only a personal item (like a small laptop bag) is free. Seats are randomly assigned for free prior to boarding.

The personal item size on United is smaller (9 x 10 x 17 inches) than Frontier or Spirit (8 x 13 x 18 inches).

Read More Nonstop Flights: Dallas to/from Denver $117-$124 r/t [June-November] (No Thanksgiving) – United

Airfare Deals Denver Star Alliance United

Airfare Deals Denver Frontier

Airfare Deals American Airlines Denver Oneworld Star Alliance United

Airfare Deals American Airlines Denver Oneworld Star Alliance United

Airfare Deals Denver Frontier

Airfare Deals Denver Star Alliance United

Airfare Deals Denver Star Alliance United

Frontier has round-trip flights from Dallas (DFW) to Denver (DEN) for $68-$95, NONSTOP. Flights August to October. Departures on Monday, Tuesday, Wednesday, Thursday, and Sunday. No Fridays or Saturdays. Very few extended weekends available. Origin/Destination reversible.

Frontier fares do not include a free carry-on bag. Only a small personal item, like a Jansport SuperBreak backpack is free. You can avoid paying for seat selection if you accept the randomly assigned seat prior to boarding.

Read More Nonstop Flights: Dallas to/from Denver $68-$95 r/t [August-October] – Frontier

Airfare Deals Denver Frontier

Frontier has round-trip flights from Dallas (DFW) to Denver (DEN) for $33-$47, NONSTOP. $18 each-way. Flights October to November. Departures on Tuesday, Wednesday, and Saturday. Extended weekends available. Origin/Destination reversible.

Note: Frontier fares do not include a free carry-on bag. Only a small personal item, like a Jansport City Scout backpack is free. You can avoid paying for seat selection if you accept the randomly assigned seat prior to boarding.

Note: Frontier seats only have 28-inches of pitch; 2-to-3 inches less space than most other airlines.

Read More Nonstop Flights: Dallas to/from Denver $33-$47 r/t [October-November] – Frontier

Airfare Deals Denver Frontier

Airfare Deals American Airlines Denver Oneworld