The cheapest times to fly from IAH to GRK are

  • May 28th to July 22nd
  • October 8th to November 18th
  • December 3rd to February 25th

based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from IAH to GRK is early November. Prices can be as high as $491 for Sunday flights during early March, or as low as $264 for Wednesday flights around early November.


When to Fly to Killeen

Flying from Houston, TX (IAH) to Killeen, TX (GRK) will usually cost between $264 to $347 per person if booking more than four weeks in advance. On average the very cheapest time to fly is early November with an average ticket price of $274. Due to high demand the most expensive time to fly is early March, with an average price of $346. Planning your trip to low-cost times can easily save you $72 on economy flights and even more on first-class flights. Generally, any price below $299 can be considered a good price for a round-trip IAH to GRK flight.

See below for a graph of average weekly prices for the IAH to GRK route. All prices are for round-trip tickets in USD.

IAH to GRK Flight Prices

Compared to other flights, the IAH to GRK flight is much cheaper than the average and costs much less than the average flight leaving from Houston. The average price per mile (for a direct flight) is $1.12, which is above average.


Flight Prices by Day of the Week

Wednesday is usually the cheapest day to fly to GRK, and Tuesday the cheapest day to fly back into IAH. Sundays are the most expensive days to fly out or take a return trip. Selecting flights on the least expensive days could save you up to $23 (7%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Wednesday and returning a week later will cost an average of $289. Return trip prices are from the GRK to IAH flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

Departure Day Prices

Return Trip Prices by Day

Return Day Prices


Nonstop Flights and Layovers

Travelers looking to fly from IAH to GRK can generally find a 0-layover flight. Because there is a direct flight option the real-world direct flight time of 1 hour 17 minutes may be realistic.


Alternative Nearby Airports

Champion Traveler tells you which airports are nearby and whether tickets might be cheaper alternative airports nearby. Sometimes it’s worth it to fly into a closer airport and then commute to your destination. Remember that there is a nonstop flight from IAH to GRK while comparing.

Destination alternative #1: Dallas/Fort Worth International Airport (DFW) in Dallas/Fort Worth, TX

  • 135 miles (217 km) away from GRK
  • Usually 21.74% less expensive than GRK
  • Nonstop flights available

See IAH to DFW flights

Destination alternative #2: Austin – Bergstrom International Airport (AUS) in Austin, TX

  • 61 miles (98 km) away from GRK
  • Usually 13.21% less expensive than GRK
  • Nonstop flights available

See IAH to AUS flights

Destination alternative #3: San Antonio International Airport (SAT) in San Antonio, TX

  • 113 miles (182 km) away from GRK
  • Usually 12.88% less expensive than GRK
  • Nonstop flights available

See IAH to SAT flights

Destination alternative #4: Abilene Regional Airport (ABI) in Abilene, TX

  • 143 miles (230 km) away from GRK
  • Usually 4.35% less expensive than GRK
  • 1-layover flights available

See IAH to ABI flights


Flight Questions Answered

Still have questions about flying from IAH to GRK? We’ve got answers.

Which airlines fly this route?

You can find 3 major airlines flying this route most often: Alaska, American, United, and potentially more during busy seasons.

How far away is it from Robert Gray AAF Airport to George Bush Intercontinental/Houston Airport?

The distance between the two airports is roughly 166 miles or 267 kilometers.

How long does it take to fly from IAH to GRK?

The real-world flight time for a nonstop IAH to GRK flight is about 1 hour 17 minutes.

How many flights go between Houston, TX and Killeen, TX?

It depends on the day of the week and the date, but a typical day might have around 41 available flights from IAH to GRK.


Airport Location Info


Departing Airport

Origination code IAH
Origination airport name George Bush Intercontinental/Houston Airport
City Houston, TX
Country the United States
Latitude 30
Longitude -95.3

Return Airport

Destination code GRK
Destination airport name Robert Gray AAF Airport
City Killeen, TX
Country the United States
Latitude 31.1
Longitude -97.8


Late and Early Flight Data

Flights from IAH to GRK tend to depart late far less frequently than the average flight. According to our recently updated data, 20% of flights departed 5 or more minutes late, and 31% of flights left 5 or more minutes early. On average you can expect to leave GRK heading for IAH about 10 minutes late. This does significantly impact arrival time, as the average landing time in Killeen, TX is about 11 minutes late. The numbers below show a recent average of take-off times versus the scheduled departure flight:

  • ExpressJet: 10 minutes late
  • Some airlines not reporting


Other Resources

Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.