United, Southwest, and American Airlines have round-trip flights from Los Angeles (LAX) to Denver or Phoenix (DEN, PHX) for $97-$147, NONSTOP. Flights April to June. No Sunday departures. Origin/Destination reversible.
Phoenix fares start at $97 and are cheaper than Denver fares which start at $137.
Southwest, United, Alaska Airlines, and Delta have posted competing round-trip flights from Seattle (SEA) to Denver, Oakland, or Phoenix (DEN, OAK, PHX) for $91-$124, NONSTOP. Flights April to May. Weekends available. Origin/Destination reversible.
Carrier will depend on date and destination selected.
United, Southwest, and Delta have round-trip flights from New York/Newark (LGA/JFK/EWR) to Denver (DEN) for $147-$158, NONSTOP. Flights March to May. Cheapest departures on Tuesday, Wednesday, and Saturday. Origin/Destination reversible.
Alaska Airlines, United, and Southwest have round-trip flights from Portland (PDX) to Denver (DEN) for $137-$148, NONSTOP. Flights February to May. Origin/Destination reversible.
United, Delta, and Southwest have round-trip flights from New York/Newark (LGA/EWR) to Denver or Atlanta (DEN, ATL) for $121-$142, NONSTOP. Flights February to March. Origin/Destination reversible.
American Airlines and United have round-trip flights from Phoenix (PHX) to Denver, San Jose CA, or Newark/New York (DEN, SJC, EWR) for $119-$155, NONSTOP. Most flights January to May, except Newark which is January and February. Origin/Destination reversible.
Southwest, American Airlines, and United have round-trip flights from Phoenix (PHX) to Denver (DEN) for $137-$148, NONSTOP. Flights January to February. Origin/Destination reversible.
I’m aware that you can find “cheaper” Frontier fares for some of these dates, but we’re ignoring LCC fares for this post.
United has round-trip flights from Portland (PDX) to Denver (DEN) for $117-$127, NONSTOP. Flights January to March. Origin/Destination reversible.
JetBlue and United have round-trip flights from New York/Newark (JFK/EWR) to Denver (DEN) for $157, NONSTOP. Flights in February. Departures on Monday, Tuesday, and Saturday.
[11/19/2025 @ 09:11 AM CT] Deal time-stamp. To book: Use our updated link list. Or book with these sites: Priceline, Skyscanner, Expedia, Travelocity, Tripadvisor, Orbitz, CheapTickets, Kayak. United has round-trip…
Frontier has round-trip flights from Atlanta (ATL) to Denver, Dallas, or Chicago (DEN, DFW, ORD) for $54-$63, NONSTOP. Flights October to December. Origin/Destination reversible. No Christmas dates available.
Frontier has round-trip flights from Los Angeles (LAX) to Denver or Houston (DEN, IAH) for $54-$59, NONSTOP. Flights October to December. No Sunday departures. Very few weekends available. Origin/Destination reversible. No Christmas dates available.
Frontier has round-trip flights from Portland (PDX) to Denver (DEN) for $54-$62, NONSTOP. Flights October to November. Origin/Destination reversible. No Thanksgiving dates.
Frontier has round-trip flights from Phoenix (PHX) to Denver, Las Vegas, or San Diego (DEN, LAS, SAN) for $39-$47, NONSTOP. Flights October to December. Departures on Tuesday, Wednesday, and Saturday. Origin/Destination reversible. No Christmas dates available.
United has round-trip flights from Atlanta (ATL) to Denver (DEN) for $133, NONSTOP. Flights September to February. Departures on Tuesday, Wednesday, and Saturday. Origin/Destination reversible.
Frontier has round-trip flights from Portland (PDX) to Denver, Phoenix, or Salt Lake City (DEN, PHX, SLC) for $56-$62, NONSTOP. Flights are between September to December. A few weekends available. Origin/Destination reversible. No Christmas dates available.
Frontier has round-trip flights from Seattle (SEA) to Denver, Los Angeles, Phoenix, or Salt Lake City (DEN, SLC, PHX, SLC) for $51-$68, NONSTOP. Flights September to December. $26-$34 each-way. Some weekends available. Origin/Destination reversible. No Christmas dates available.
Southwest, Delta, United, JetBlue and various other airlines have round-trip flights from New York/Newark (LGA/JFK/EWR) to Denver (DEN) for $177, NONSTOP. Flights September to December. Departures on Monday, Tuesday, Wednesday, Thursday, and Saturday. Origin/Destination reversible. No Christmas dates available.
American Airlines, United, and Delta have round-trip flights from Los Angeles (LAX) to Denver (DEN) for $139-$148, NONSTOP. Flights August to December. Departures on Monday, Tuesday, Wednesday, Thursday, and Saturday. Extended weekends available. Origin/Destination reversible. No Christmas dates available.
Frontier has round-trip flights from Los Angeles (LAX) to Denver (DEN) for $38, NONSTOP. $19 each-way. Flights July to November. Departures on Tuesday, Wednesday, and Saturday. Extended weekends available. Origin/Destination reversible. No Thanksgiving dates.
