It would go up yes, but probably not as much as you think. Carbon tax proposals generally range from $50-200/ton. The ICAO has a carbon emission estimating tool (https://www.icao.int/environmental-protection/CarbonOffset/P...) that says emissions from a Seattle-Orlando round trip flight are are about 1350 lbs/pp. That makes that (fairly long) trip cost $34 to $135 more per person.

That’s significant, but a ticket already generally costs $387 to $400/pp in moderate travel months if you take a bag.