Frontier has round-trip flights from Houston (IAH) to Denver (DEN) for $56-$62, NONSTOP. Flights April to June. Departures on Monday, Tuesday, Wednesday, Thursday, and Saturday. Origin/Destination reversible.
Category: <span>Denver</span>
Image Credits: Larry Johnson, Creative Commons 2.0
Image Credits: Larry Johnson, Creative Commons 2.0
United and Southwest have round-trip flights from Houston (IAH/HOU) to Denver (DEN) for $143-$150, NONSTOP. Flights April to May. No Sunday departures. Origin/Destination reversible.
Yes we know that Frontier has $46 round-trips ($120 with bag/seat bundle). We covered Frontier in a separate post.
These will be more expensive than Frontier even considering bag/seat fees, but keep in mind that even if you do the bundle on Frontier, your seat pitch is still 28-inches max. On Southwest it’s 31-inches / United 30-inches.
United/Southwest calendar availability is better than Frontier’s. More weekends dates and more flights per day.
Image Credits: Larry Johnson, Creative Commons 2.0
Southwest and United have round-trip flights from Houston (HOU/IAH) to Denver (DEN) for $146-$157, NONSTOP. Flights April to May. Cheapest departures on Tuesday, Wednesday, and Saturday.
Yes we know that Frontier has $46 round-trips ($120 with bag/seat bundle). We covered Frontier in a separate post.
These will be more expensive than Frontier even considering bag/seat fees, but keep in mind that even if you do the bundle on Frontier, your seat pitch is still 28-inches max. On Southwest it’s 31-inches / United 30-inches.
Image Credits: Larry Johnson, Creative Commons 2.0
Frontier has round-trip flights from Houston (IAH) to Denver, Chicago, or Atlanta (DEN, ORD, ATL) for $46-$56, NONSTOP. $23-$33 each-way. Cheapest departures on Tuesday, Wednesday, and Saturday.
Denver and Chicago: Flights April to May.
Atlanta: March to May.
Image Credits: Larry Johnson, Creative Commons 2.0
Frontier has round-trip flights from Houston (IAH) to Denver (DEN) for $41-$46, NONSTOP. $21-$23 each-way. Flights April to May Departures on Tuesday, Wednesday, and Saturday. Limited calendar availability. Origin/Destination reversible.
Image Credits: yeowatzup, Creative Commons 2.0
Frontier has round-trip flights from Houston (IAH) to Denver, Orlando, Chicago, Los Angeles, Baltimore (DEN, MCO, ORD, LAX, BWI) for $49-$62, NONSTOP. $25-$31 each-way. Flights December to February. Origin/Destination reversible. No Christmas dates available.
Image Credits: Larry Johnson, Creative Commons 2.0
Frontier has round-trip flights from Houston (IAH) to Denver (DEN) for $58-$62, NONSTOP. Flights December to February. Weekends available. Origin/Destination reversible. No Christmas dates available.
Image Credits: Larry Johnson, Creative Commons 2.0
[07/25/2025 @ 4:55 PM CT] Deal is back on. Expect it to fluctuate at the whim of the airline, on/off whenever.
Frontier has round-trip flights from Houston (IAH) to Denver (DEN) for $60-$70, NONSTOP. Flights August to November. Weekends available. No Thanksgiving dates.
Frontier deals are usually limited in availability and sell out quickly.
Image Credits: Larry Johnson, Creative Commons 2.0
Southwest and United have round-trip flights from Houston (HOU/IAH) to Denver (DEN) for $135, NONSTOP. Flights May to November. Departures on Tuesday, Wednesday, and Saturday. Extended weekends available. Origin/Destination reversible. No Thanksgiving dates.
Image Credits: Larry Johnson, Creative Commons 2.0
Frontier has round-trip flights from Houston (IAH) to Denver or Orlando (DEN, MCO) for $58, NONSTOP. Flights March to June. Departures on Tuesday, Wednesday, and Saturday. Extended weekends available. Origin/Destination reversible.
Image Credits: Larry Johnson, Creative Commons 2.0
United has round-trip flights from Houston (IAH) to Denver (DEN) for $131, NONSTOP. Flights November to December. Very few extended weekends available. Holiday blackouts.
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).
Image Credits: Larry Johnson, Creative Commons 2.0
Southwest has round-trip flights from Houston (HOU) to Denver (DEN) for $122, NONSTOP. Flights August to November. Departures on Tuesday, Wednesday, and Saturday. Origin/Destination reversible. 7-day minimum stay required. No Thanksgiving dates.
Image Credits: Larry Johnson, Creative Commons 2.0
United has round-trip flights from Houston (IAH) to Denver (DEN) for $137, NONSTOP. Flights August to November. Departures on Tuesday, Wednesday, and Saturday. 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.
Image Credits: Larry Johnson, Creative Commons 2.0
Frontier has round-trip flights from Houston (IAH/HOU) to Denver (DEN) for $48-$58, NONSTOP. Flights April to May. Extended weekends available. Origin/Destination reversible.
Image Credits: Larry Johnson, Creative Commons 2.0
United has round-trip flights from Houston (IAH) to Denver (DEN) for $131-$147, NONSTOP. Flights February to May. Departures on Monday, Tuesday, Wednesday, Thursday, and Saturday. Extended weekends available. Origin/Destination reversible.
Southwest has competitive fares if you add the “SAVENOW” coupon-code. Keep in mind that while the coupon code at Southwest says 50% off, the base fares are about 50% higher than these. So once you do the math the Southwest fares are more expensive. You do get better bag allowance however.
Image Credits: Larry Johnson, Creative Commons 2.0
United has round-trip flights from Houston (IAH) to Denver (DEN) for $156, NONSTOP. Flights September to February. Weekends available. Origin/Destination reversible.
Image Credits: Larry Johnson, Creative Commons 2.0
American Airlines and United have round-trip flights from Houston (IAH/HOU) to Denver (DEN) for $177, NONSTOP or with connections. Flights July to November. Weekends available. Origin/Destination reversible. No Thanksgiving dates.
Image Credits: Larry Johnson, Creative Commons 2.0
United has round-trip flights from Houston (IAH) to Denver (DEN) for $158, NONSTOP. Flights April to May. No Monday departures. Very few weekends available.
Image Credits: yeowatzup, Creative Commons 2.0
Frontier has round-trip flights from Houston (HOU/IAH) to Denver or Orlando (DEN, MCO) for $38-$46, NONSTOP. Flights January to March. Departures on Tuesday, Wednesday, and Saturday. Extended weekends available. Origin/Destination reversible.
Image Credits: Larry Johnson, Creative Commons 2.0
Frontier and Spirit have round-trip flights from Houston (IAH) to Denver (DEN) for $47-$56, NONSTOP. Flights July to September. Extended weekends available. Origin/Destination reversible.