The cheapest times to fly from SJU to GRK are

  • January 8th to February 4th
  • April 16th to April 29th
  • May 28th to June 17th
  • July 9th to November 11th (except the weeks of July 30th and October 1st)

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 SJU to GRK is mid to late September. Prices can be as high as $1162 for Sunday flights during early January, or as low as $433 for Wednesday flights around mid to late September.


When to Fly to Killeen

Flying from San Juan, PR (SJU) to Killeen, TX (GRK) will usually cost between $436 to $835 per person if booking more than four weeks in advance. On average the very cheapest time to fly is mid to late September with an average ticket price of $468. Due to high demand the most expensive time to fly is early January, with an average price of $775. Planning your trip to low-cost times can easily save you $306 on economy flights and even more on first-class flights. Generally, any price below $495 can be considered a good price for a round-trip SJU to GRK flight.

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

SJU to GRK Flight Prices

Compared to other flights, the SJU to GRK flight is much cheaper than the average and costs less than the average flight leaving from San Juan. The average price per mile (for a direct flight) is $0.14, which is far below 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 SJU. 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 $155 (24%) 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 $490. Return trip prices are from the GRK to SJU 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 SJU to GRK can generally find a 1-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 4 hour 53 minutes may not 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 not usually a nonstop flight from SJU to GRK while comparing.

Destination alternative #1: Austin – Bergstrom International Airport (AUS) in Austin, TX

  • 61 miles (98 km) away from GRK
  • Usually 16.68% less expensive than GRK
  • 1-layover flights available

See SJU to AUS flights

Destination alternative #2: Dallas/Fort Worth International Airport (DFW) in Dallas/Fort Worth, TX

  • 135 miles (217 km) away from GRK
  • Usually 11.53% less expensive than GRK
  • Nonstop flights available

See SJU to DFW flights


Flight Questions Answered

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

Which airlines fly this route?

You can find 5 major airlines flying this route most often: American, Cape Air, Delta, Seaborne Airlines, United, and potentially more during busy seasons.

How far away is it from Robert Gray AAF Airport to Luis Munoz Marin International Airport?

The distance between the two airports is roughly 2168 miles or 3489 kilometers.

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

The real-world flight time for a nonstop SJU to GRK flight is about 4 hour 53 minutes.

How many flights go between San Juan, PR and Killeen, TX?

It depends on the day of the week and the date, but a typical day might have around 64 available flights from SJU to GRK.


Airport Location Info


Departing Airport

Origination code SJU
Origination airport name Luis Munoz Marin International Airport
City San Juan, PR
Country the United States
Latitude 18.4
Longitude -66

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


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.