Pop the hood, open the fuse box, then swap the Left and Right relays for the Low Beams. If the issue moves to the other side then it's the relay.
If not, swap the fuses Left to Right. If the issue moves it's the fuse.
If not, or if the issue is resolved, the connection at the relay and/or fuse may have been dirty.
If the issue is still at the same bulb, the wiring from the relay to the headlight is suspect. If you're willing to take apart part of your car you can get the headlight housing out without pulling the entire bumper off, but you'll certainly loosen a lot of it. Remove radiator cover then remove the single bolt inside the front wheel well. There's a hole in the fender liner to remove the bolt that holds the edge of the bumper cover securely. With that out remove the 3 "christmas tree" plastic trim fasteners. Next, up top, lift corner of bumper cover where it meets the fender to un-snap it, then do the same to the edge where it meets the wheel opening. Pull forward gently to reveal the 2 bolts holding the headlight housing (one on radiator support, one on side). Next, push down gently but firmly to "unlock" the housing from the car, then pull forward to remove. Make sure the 2 little "wings" on the bumper cover are no longer engaged with the bottom of the housing.
When reinstalling housing, I just put the front bolt in after getting it installed to the car. I also reinstalled the fender liner bolt to keep the bumper cover secured.
With the housing separated from the car there's a main harness plug clipped to the front inside of the housing. Unplugging it will be the final step to remove the housing from the car. Inspect the terminals and wires on the car harness as well as the housing wiring. Also check to be sure the light is fully plugged in.
To test, plug in the main harness and ensure all bulbs are plugged in, then turn on the low beams. Twist and remove the low beam from the housing (CAUTION! Don't touch the glass!!!) While holding it with one hand use the other to flick the base to introduce a "bump" to the bulb. If the light goes out or flickers the bulb is bad.
Reinsert the bulb into the housing. Now do the wiggle test. (No, don't wiggle your butt!
) Wiggle all the wiring, tap or flick the relays and the fuses.