Check airline website for more info on travel fees. But I believe all airlines allow you to check car seats and strollers for free (per baby). With a child that age who can’t consistently follow directions, I would check the stroller at the gate so that you have the stroller up until you board and you can get it when you get off the plane. Are the kids going to be in your laps? We did a flight from California to Ohio with my son when he was 18 months. He was a lap baby for the flight. I had just enough leg room for him to stand between my knees. We didn’t have to walk around. He was entertained enough by the views outside the window, snacks, magazines they provided, a few shows/games on his tablet... but he mostly slept.
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