Jetstar Japan vs Spring Japan: fleets and facts compared

Jetstar's Japan website gives the following allowances for Jetstar Japan (GK) flights. Sizes and weights only.

• Carry-on, Starter fare: two items (one main item plus one small item) with a combined weight of 7 kg. The main item must fit in the overhead locker and not exceed 56 cm (H) x 36 cm (W) x 23 cm (D); the small item, such as a handbag or thin laptop bag, must fit under the seat.
• Extra carry-on: on selected routes, an add-on or a fare bundle raises the allowance to 14 kg, still two items, with the main item no heavier than 10 kg.
• Checked baggage: not included in Starter fares; it can be bought, or comes with some bundles, up to 40 kg per passenger. No single item may weigh more than 32 kg, and items longer than one metre in any direction count as oversized.
• Infants under two on an adult's lap have no carry-on allowance of their own; some infant items can be checked in free.

Jetstar's page notes that carry-on rules change on Jetstar Airways (JQ) flights from 2 February 2027; the allowances above apply to GK flights. Source: Jetstar Japan website, "Carry-on baggage" and "Checked baggage", read on 24 October 2026.

Source: airline baggage page, read 2026-10-24.

Spring Japan's baggage pages for domestic (IJ) flights give the following allowances. Sizes and weights only.

• Cabin baggage: one personal item (such as a handbag, camera or umbrella) plus one carry-on bag, with a combined weight of 7 kg. The bag may measure up to 56 x 36 x 23 cm, and the three sides must add up to 115 cm or less. Laptops and tablets do not count towards the 7 kg.
• Checked baggage included by fare: Lucky Spring 0 kg; Spring 20 kg; Spring Plus 30 kg. There is no limit on the number of pieces.
• Maximum weight per piece: 30 kg.
• Maximum size per piece, flights up to 20 December 2026: three sides adding up to 203 cm or less.
• Maximum size per piece, flights from 21 December 2026: longest side 100 cm or less and three sides adding up to 203 cm or less.
• Baby items such as strollers, car seats and portable cradles are carried free, one per infant or child.

Source: Spring Japan, "機内持ち込み手荷物について" (carry-on baggage) and "お預けの手荷物について" (checked baggage), IJ domestic pages, read on 24 October 2026.

Source: airline baggage page, read 2026-10-24.