Basic Economy Economy PER PASSENGER
On the plain
1 personal item (up to 43 × 25 × 22 cm) only on most domestic/short-haul routes. Transatlantic, transpacific and South America fares also include 1 full carry-on (56 × 35 × 23 cm).
Checked in
No free checked bag on most fares — first bag roughly $35–$40 prepaid online (confirm on united.com). Max 23 kg / 158 cm per bag.
Economy / Economy Plus Economy PER PASSENGER
On the plain
1 carry-on up to 56 × 35 × 23 cm plus 1 personal item up to 43 × 25 × 22 cm.
Checked in
Usually paid on domestic routes (first bag roughly $35–$40 prepaid); many international fares include 1 free bag. Max 23 kg / 158 cm.
Premium Plus / Business / First / Polaris Premium Economy / Business / First PER PASSENGER
On the plain
1 carry-on plus 1 personal item.
Checked in
Free checked bags included (typically up to 32 kg / 158 cm each) — number varies by cabin and route.