United and Alaska Airlines have round-trip flights from Seattle (SEA) to Denver (DEN) for $157-$176, NONSTOP. Flights in May. Departures on Tuesday, Wednesday, and Saturday. Very few extended weekends available. Origin/Destination reversible.
Category: <span>Denver</span>
Frontier has round-trip flights from Phoenix (PHX) to Denver, Las Vegas, Salt Lake City, San Diego, or San Francisco (DEN, LAS, SLC, SAN, SFO) for $48-$58, NONSTOP. Flights March to June. Departures on Tuesday, Wednesday, and Saturday. Extended weekends available. Origin/Destination reversible.
Southwest has round-trip flights from Los Angeles (LAX) to Denver (DEN) for $127-$136, NONSTOP. Flights March to May. Weekends available.
United, Delta, and Southwest have round-trip flights from New York/Newark (EWR/LGA) to Denver, Grand Rapids, Seattle, or Portland Oregon (DEN, GRR, SEA, PDX) for $151-$177, NONSTOP. Most flights between January and March. Grand Rapids flights between January and October. Weekends 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).
United has round-trip flights from Portland (PDX) to Denver, Chicago, Newark/New York (DEN, ORD, EWR) for $139-$187, NONSTOP. Flights January to February. Weekends available.
Denver is the cheapest fare at $139. New York is the most expensive at $177.
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).
United has round-trip flights from Seattle (SEA) to Denver, Houston, or New York (DEN, IAH, EWR) for $139-$177, NONSTOP. Flights January to February. Weekends available.
Denver is the cheapest fare at $139. New York is the Most expensive fare at $177.
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).
Frontier has round-trip flights from Chicago (MDW) to Denver (DEN) for $38-$55, NONSTOP. Flights December to March. Departures on Monday, Tuesday, Wednesday, Thursday, and Saturday. Extended weekends available. No Christmas dates available.
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.
United has round-trip flights from Portland (PDX) to Denver (DEN) for $137, NONSTOP. Flights January to March. Departures on Tuesday, Wednesday, and Saturday. Extended weekends 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).
Frontier has round-trip flights from Los Angeles (LAX) to Denver (DEN) for $38-$45, NONSTOP. Flights December to February. Departures on Tuesday, Wednesday, and Saturday. Extended weekends available. No Christmas dates available.
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.
Frontier seats only have 28-inches of pitch; 2-to-3 inches less space than most other airlines.
JetBlue has round-trip flights from New York (JFK) to Denver (DEN) for $177, NONSTOP. Flights December to March. Departures on Monday, Tuesday, Wednesday, Thursday, and Saturday. Extended weekends available. No Christmas dates available.
JetBlue’s “Basic” fares allow for a carry-on bag and a small personal item (17 x 13 x 8 inches), like a Jansport SuperBreak backpack without a fee. You can avoid seat selection fees by accepting the randomly assigned seat at the gate.
Southwest has round-trip flights from Seattle (SEA) to Denver (DEN) for $112, NONSTOP. Flights November to December. No Tuesday departures. Weekends available. Origin/Destination reversible. No Christmas dates available.
Southwest has round-trip flights from Portland (PDX) to Denver, Sacramento, Oakland, or San Jose (DEN, SMF, OAK, SJC) for $108-$148, NONSTOP. Flights November to December. Weekends available. Origin/Destination reversible. Holiday blackouts.
Southwest has round-trip flights from Seattle, Portland, or Phoenix (SEA, PDX, PHX) to Denver (DEN) for $108-$132, NONSTOP. Flights October to December. Weekends available. Origin/Destination reversible. No Christmas dates available.
United has round-trip flights from Portland (PDX) to Denver (DEN) for $137-$144, NONSTOP. Flights September to December. Departures on Tuesday, Wednesday, and Saturday. 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).
United has round-trip flights from Seattle (SEA) to Denver (DEN) for $137, NONSTOP. Flights September to December. Departures on Monday, Tuesday, Wednesday, Thursday, and Saturday. 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).
Delta has round-trip flights from New York (LGA) to Denver (DEN) for $149, NONSTOP. Flights August to December. Departures on Tuesday, Wednesday, and Saturday. Extended weekends available. Origin/Destination reversible. No Christmas dates available.
A Carry-on bag and also a personal item is allowed for free on Delta. You can avoid paying for seat selection by accepting the randomly assigned seat at the gate.
Delta has round-trip flights from Seattle (SEA) to Denver (DEN) for $121, NONSTOP. Flights August to December. Departures on Tuesday, Wednesday, and Saturday. Extended weekends available. Origin/Destination reversible. No Christmas dates available.
A Carry-on bag and also a personal item is allowed for free on Delta. You can avoid paying for seat selection by accepting the randomly assigned seat at the gate.
United has round-trip flights from Portland (PDX) to Denver or Chicago (DEN, ORD) for $121-$163, NONSTOP. Flights August to December. Departures on Tuesday, Wednesday, and Saturday. 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).
American Airlines and United have round-trip flights from Phoenix (PHX) to Denver (DEN) for $117-$125, NONSTOP. Flights July to November. Very few weekends available. Origin/Destination reversible. No Thanksgiving dates.
A Carry-on bag and also a personal item is allowed for free on American. You can avoid paying for seat selection by accepting the randomly assigned seat at the gate.
United has round-trip flights from Chicago or Milwaukee (ORD, MKE) to Denver (DEN) for $137-$146, NONSTOP. Flights August to December. Very few 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.


