Route guide · 862 miles
Cheap Flights from Denver to Houston
DEN → IAH · Nonstop 2h 15m · Live round-trip fares
If Houston is next on your list, here's the honest picture on fares from Denver. The trip covers about 862 miles and takes roughly 2h 15m in the air. Prices on this route reward planners: booking 3–6 weeks ahead is the sweet spot, and the lowest fares tend to sell out fast.
Live fares for DEN → IAH are updating. Use the search below for real-time prices.
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Flight time
2h 15m
Nonstop, typical
Distance
862 mi
DEN → IAH
Book ahead
3–6 weeks
Best window, typically
Nonstop airlines
3
Frontier Airlines, Spirit Airlines & more
Nonstop flights from Denver to Houston
Want to skip the layover? Nonstops from Denver to Houston are flown by Frontier Airlines, Spirit Airlines, United Airlines, getting you there in about 2h 15m. For the lowest fares, book around 3–6 weeks before departure — last-minute nonstops on this route rarely come cheap.
Booking insights: Denver → Houston
- Distance: 862 miles · nonstop flight time: 2h 15m.
- Rule of thumb for this route: the sweet spot is usually 3–6 weeks before departure.
- If your dates flex by a day or two, shifting to a midweek departure is the easiest saving there is.
- Set a free Airfare Deal alert instead of checking daily — the best fares can sell out in hours.
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Flying from Denver to Houston: what you need to know
The flight
Denver to Houston covers 862 miles, and a nonstop gets it done in about 2h 15m. That's long enough to settle in with a coffee and a downloaded show, short enough that a connection rarely makes sense — a layover usually doubles your travel day to save very little.
Airlines on this route
Frontier Airlines, Spirit Airlines and United Airlines fly this route nonstop. That matters more than it sounds: the cheapest fare on one carrier is rarely the same product as the cheapest on another. Checked-bag fees, free seat selection and change rules all differ, so compare the full trip cost before you pick a winner. See our airline guides for exactly what each carrier charges — then send an enquiry and we'll confirm the all-in price for your dates.
Leaving from Denver (DEN)
Plan to be at the airport two hours before a domestic departure — ninety minutes can work at smaller airports outside peak times, but security lines are the one variable you can't control. If you're checking a bag, add time rather than cutting it close. Our Denver airport guide covers terminals, parking and ground transport so you can plan the trip to the airport, not just the flight.
Arriving in Houston (IAH)
Before you land, know how you're getting from the airport to where you're staying — it's the part of the trip people forget to plan. The Houston airport guide lays out your ground options, from transit and shuttles to rideshares and rental cars. Flying back the other way? Check Houston to Denver fares — prices on the return direction often move on a different rhythm.
When to book
For a trip of 862 miles, booking 3–6 weeks ahead typically lands you in the sweet spot. Leave it to the final two weeks and prices usually climb as the cheapest seats sell out. If your dates are flexible, midweek departures are where the lower fares hide on most domestic routes.
Good to know before you go
- Get to the airport two hours before departure; security, not the flight, is the part that runs late.
- If you're traveling with only a carry-on, you can skip the bag-drop line entirely with mobile check-in.
- Download the airline's app before you fly; gate changes and delays show up there first.
- Nonstop time on this route is about 2h 15m — a one-stop itinerary needs to be a lot cheaper to be worth the extra hours.
- Tuesday and Wednesday departures are typically the cheapest days on domestic routes.
Denver to Houston flight FAQs
How long is the flight from DEN to IAH?
A nonstop from DEN to IAH clocks in at around 2h 15m for the 862-mile trip. If you're connecting, budget an extra 2–4 hours depending on where you stop.
Are there nonstop flights from Denver to Houston?
Yes — look for Frontier Airlines, Spirit Airlines, United Airlines on this route. Nonstop seats are usually priced best 3–6 weeks before departure.
What is the cheapest month to fly from Denver to Houston?
There's no single magic month, but prices on this route generally soften in the shoulder season, when demand dips after the holidays and again in early fall. A free fare alert is the easiest way to catch those windows.
How much are last minute flights from DEN to IAH?
Book inside the final week and you'll usually pay a premium on DEN to IAH. Fares booked 3–6 weeks ahead are almost always kinder.
What is a good round-trip deal from Denver to Houston?
A good deal is anything at or below the recent fares shown above. Set a free Airfare Deal alert and we'll ping you the moment fares drop.
Which airlines fly from Denver to Houston?
The main carriers on this route are Frontier Airlines, Spirit Airlines, United Airlines. Comparing all of them on the live search below usually surfaces the lowest fare for your dates.
How early should I get to Denver airport for this flight?
Plan on two hours before departure for a domestic flight — ninety minutes can work at smaller airports outside peak times. If you're checking a bag, earlier is better; the bag-drop line, not the flight, is what runs late.
Do the cheapest fares on this route include a checked bag?
Usually not. Basic economy fares on most airlines include a carry-on but charge extra for checked bags, and seat selection can cost more too. Add up the real total before comparing — a slightly higher regular fare sometimes works out cheaper. Our team confirms the full breakdown with you before you pay.
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