There are three airlines offering flights to Dallas. The most direct route isn’t necessarily the cheapest – being flexible is key to finding the lowest airfare rates. For example, try searching by month to see the best time of the week to fly. The cheapest date is currently 12 / May / 2021.
You can use the filters on your search to see more flights and find cheaper rates – Dallas has more than one airport. So if you don't need to fly into Dallas/Fort Worth International Airport, it's worth checking your other options. The 7194 km flight usually takes about 13 hrs 25 mins.
If you're planning on going to Dallas during this time, you could take a look at other airport options. Or you could try to get a last-minute bargain.