United has round-trip flights from Dallas (DFW/DAL) to Aspen (ASE) starting at $114 with a connection. $57 each-way. Flights March to June. No Sunday or Monday returns. Origin/Destination reversible.
Note: A checked bag will cost +$30 each-way in “Basic Economy”.
Note: “Basic Economy” fares do not include a free carry-on bag. Only a tiny personal item (like a laptop bag) is allowed for free. United’s personal item allowance of (9in x 10in x 17in) is smaller than most other airlines. Seats are randomly assigned prior to boarding. If you have the United MileagePlus credit-card, use the “free checked bag” perk.