Cheap Flights from Denver International (DEN) to Sioux City (SUX)

Compare Denver International to Sioux City flight deals

Find the cheapest month or even day of the year to fly to Sioux City

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Flight deals from Denver International to Sioux City

Looking for a cheap last-minute deal or the best return flight from Denver International to Sioux City? Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from Denver International to Sioux City

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Denver International to Sioux City flights are currently cheapest in April.

Direct flights from Denver International to Sioux City

Denver International to Sioux City: Alternative routes

Compare routes from Denver International to Sioux City below. You may find an airport to fly into that's cheaper, faster, or easier than Sioux City.

Denver to Sioux City: Flight information

The things to know before you go.
Cheapest flight found£158
Cheapest month to flyApril
Average flight time1 hr, 40 mins
Most popular airlineUnited
Average flights per week35

Finding cheap flights from Denver International to Sioux City: Frequently asked questions

The best price we found for a return flight from Denver International to Sioux City is £158. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
1 hour and 40 minutes is the average flight time from Denver International to Sioux City.
United and SkyWest Airlines fly direct from Denver International to Sioux City.
As of March 2026, there are 35 flights per week flying from Denver International to Sioux City.
The cheapest month to fly from Denver International to Sioux City is usually April.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Denver International Airport to Sioux City Airport on Friday, 3 April 2026.
Yes – the average flight time is 1 hour and 40 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Sioux City but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Sioux City is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, United offers the cheapest flight tickets to Sioux City.

Flying from Denver International Airport (DEN) to Sioux Gateway Airport (SUX): what you need to know

  • Get to the airport on time so you don't miss your DEN to SUX flight. Be there at least two hours ahead for international flights and an hour early for domestic departures to avoid a last-minute sprint to the gate.

  • Be prepared for bigger queues in popular months like July. Arriving up to four hours in advance for international flights and two hours for domestic departures is a smart move.

  • United Airlines is your gateway to discovering Sioux City (and perhaps some other great parts of United States!). Check out the direct flights from Denver International Airport to Sioux Gateway Airport offered by this popular carrier.

  • The airline that tops the list for bookings on this route is United Airlines.

  • United Airlines is the most punctual carrier operating DEN to SUX flights. A dependable 88.33% of its services on this route arrive on time.

  • Break up your flight or take a detour to a new city with a stopover. Just deselect 'Direct flights only' to see your options when searching for tickets from Denver International Airport to Sioux Gateway Airport. Many passengers pass through O'Hare International Airport on this route.

How to find the cheapest flights from Denver International Airport (DEN) to Sioux Gateway Airport (SUX)

  • £113 is the best price for a one-way Denver International Airport to Sioux Gateway Airport flight. Return flights start from £158. These prices can change depending on demand.

  • To pick up cheap tickets from DEN to SUX, book ahead. Airlines typically offer lower fares when flights are first released.

  • Getting cheap flights from Denver International Airport to Sioux Gateway Airport is easy if you can be flexible with your dates. Use the 'Whole month' function to see the lowest prices across every month and land a great deal.

  • Save time searching for cheap flights from DEN to SUX by creating a Price Alert. We'll send you an email or push notification on the app when a new low fare is offered.

  • Select your preferred departure and arrival times, airlines and number of stops with the filters. Or sort your results by 'Cheapest' to get the best deals on flights from Denver International Airport to Sioux Gateway Airport.

Handy information about Denver International Airport (DEN)

  • You'll find DEN at 8500 Pena Boulevard.

  • Denver International Airport maintains a strong on-time record, so you're unlikely to face delays. Departures from DEN land at their destination as scheduled 80.23% of the time.

  • To get to Denver International Airport from central Denver, it'll take about 35 minutes by car. This depends on traffic, however. It's approximately 25 miles from the airport to the city centre.

  • Expect a journey time of around 1 hour 30 minutes when using public transport.

  • Get your flight from Denver International Airport to Sioux Gateway Airport off to a relaxed start. Just a quick drive from DEN, book a night at Baymont by Wyndham Denver International Airport and you'll be well-rested for the trip ahead.

Arriving at Sioux Gateway Airport (SUX)

  • If you have a late Denver International Airport to Sioux Gateway Airport flight, few things top the convenience of staying close to the terminal. Pick up your bags from the carousel and then be showered and resting soon after at one of these accommodation options near SUX:

  • Grab a Sioux Gateway Airport rental car and discover Sioux City and beyond with your own wheels. Enterprise, Hertz and National are top providers you can book with here.

  • Reserve your vehicle from Sioux Gateway Airport several weeks ahead to secure the best deal. If you're travelling during a busy period, it's a good idea to book even earlier.

Getting from Sioux Gateway Airport (SUX) to central Sioux City

  • SUX is located at 2403 Odgen Road.

  • Sioux Gateway Airport to central Sioux City has a drive time of about 10 minutes. It's approximately 8 miles away.

  • It takes around 30 minutes if you're using public transport.

When to fly to Sioux Gateway Airport (SUX)

  • April is the busiest month for flights from Denver International Airport to Sioux Gateway Airport. To steer clear of the crowds, visit Sioux City in February.

  • The warmest month in Sioux City is July, with temperatures ranging between 15ºC (59ºF) and 33ºC (91ºF). Lock in your flights from Denver International Airport to Sioux Gateway Airport in this month if this is the type of weather you like.

  • Look for cheap tickets from DEN to SUX in January if you'd rather travel during cooler conditions. Temperatures are at their lowest then, ranging between -14ºC (7ºF) and 2ºC (36ºF) on average.

Explore more of United States

  • You've visited Sioux City, now it's time to explore other parts of United States. Journey about 250 miles south-east to Kansas City to check off its popular sights. From National WWI Museum and Memorial to Union Station Kansas City and The Irish Centre at Union Station, there's plenty to keep you busy.

  • If you're eager to discover another well-known destination in United States, consider Omaha, about 90 miles south of Sioux City. Old Market, Bob Kerrey Pedestrian Bridge and Heartland of America Park are key highlights.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.