China Domestic Flight Seasonality 2026: When to Book and What the Fare Rules Say

There is no official answer to "which day, week or month is cheapest." None of the official pages reviewed for this guide (Air China, China Eastern, China Southern, Hainan Airlines and the Civil Aviation Administration of China, CAAC) publishes data on when China domestic fares are lowest, so any exact "best window" you see elsewhere has no official backing here. What the pages do publish matters more than timing. Every fare is tied to a fare class (a booking code), each class has its own change and refund conditions, and the price and conditions shown when you pay are the ones that apply. The useful question is therefore not "when" but "which fare class, with which conditions." The sections below cover what those conditions cost, plus baggage, delays and ID.

What the official pages say about timing

Very little, and it is worth reading closely.

• China Southern says prices and service conditions may differ by sales channel, purchase time and flight, and tells you to go by the search results shown at the time of purchase (China Southern, domestic booking notes).
• China Eastern's general conditions, effective July 1, 2026, say the fare is the price applicable to the flight when you buy. If the airline adjusts a fare after your ticket is sold, your ticket's fare stays as it was (China Eastern general conditions, article 3.2.1). That works in both directions: a later fare cut does not reprice a ticket you already hold.
• The same article says different fares carry different change and refund restrictions, and that you should pick the fare type that fits your needs.

Nothing in these pages names a best weekday, a best number of days ahead, or a time of day when fares are released. Rules of thumb like that circulate widely, but none of the five sources supports them, so this guide does not repeat them.

Does the season change fares, and what can you check yourself?

The official pages contain no seasonal price data, so this guide names no cheap or expensive months and gives no price multiples. One remark is common sense, not from any source: holiday periods tend to be busier, so waiting is riskier when your dates fall on one. For real prices, check the current official holiday schedule, then compare your exact dates on the airline's own booking page and fare calendar.

What you can verify before paying comes from CAAC's Regulation on the Management of Public Air Transportation Services for Passengers (in force September 1, 2021; the CAAC English page is marked "translation for reference only"). Article 15 says an online seller of tickets, whether the airline or its sales agent, must show you the main service information before you buy:

Article 16 adds that online sellers must include the full general conditions of carriage as a mandatory item for you to read and acknowledge before you complete the purchase (CAAC Regulation). On booking sites and apps in general, the Regulation says sales agents may not arbitrarily change the airline's service provisions (Article 9), and a voluntary change or refund is handled under the airline's general conditions and the ticket's conditions (Article 23). Airline rules apply whichever channel issued the ticket.

What changing or refunding costs

Fees depend on two things: the fare class letter, and how long before scheduled departure you act. Five classes (Y, C, M, K, H) from China Eastern's published schedule are quoted below.

China Eastern domestic flights. These rules apply to tickets sold on or after August 6, 2026, for travel on or after that date, on China Eastern domestic flights including codeshares, unless the ticket states other restrictions; earlier tickets follow the original conditions. Fees are percentages of the fare and fall into five bands, measured from the scheduled departure of each segment after the last change to the time the reservation is cancelled in the system, and calculated to the minute (14 days is 336 hours, 7 days is 168 hours). Selected classes, shown as change fee / refund fee:

Source: the appendix to China Eastern's domestic implementing rules, August 2026 version. The full table covers 23 class letters. Other points from the same rules:

• A change also brings any difference in fare, taxes or fuel surcharges. A change fee you already paid is not refunded if you refund later.
• Open tickets are allowed only for F/U/J/W/Y. Other classes cannot be issued open.
• Completely unused tickets are valid for one year. Refund requests are accepted up to one month after the ticket expires (general conditions, article 4.2.1.4).
• For a ticket marked non-refundable or with nothing left to refund, refundable taxes and fuel surcharges can still be refunded, with no refund fee.
• When downgrading cabin class, if the new fare is lower than or equal to the original fare, the ticket can be refunded and re-bought; if the new fare costs more, it is refunded and a new ticket is bought. Upgrading without changing the flight or date instead requires paying the fare difference.

China Southern domestic flights. The domestic booking notes give rules rather than a fee table:

• Domestic tickets are valid for one year. A voluntary refund must be requested within 13 months of the start of travel (or of issue, if the first segment is unused), and in principle at the original place of purchase.
• For discounted tickets outside classes F/J/W/Y, the new date must fall within 7 days before and after the original date. Beyond that, the ticket is handled as a full cancellation or a voluntary change. Full-price F/J/W/Y tickets have no date-change restriction; discounted tickets in those classes follow the stricter rule.
• If a change lowers the fare, it is handled as a voluntary refund and you can buy again. If the fare rises, you pay the difference plus a change service fee. The page does not give fee amounts.

Air China and Hainan Airlines. This guide does not quote Air China's full domestic fee schedule or Hainan's domestic change and refund fees.

Can you cancel for free right after booking?

Air China has a 2-hour policy, and the domestic and international versions differ (Air China rules).

Rules common to both:

• The 2 hours run from ticket issue to the moment you submit the request. A ticket issued at 16:10 qualifies until 18:10.
• A multi-segment ticket must be refunded as a whole. The domestic fee uses the first segment's departure time.
• You get one such refund per passenger per flight (domestic) or per flight and date (international). Re-buying the same flight and refunding again falls under the normal fee schedule.
• Tickets that were changed, checked in or partly used, and mileage, group and standby tickets, are excluded.

If you ask more than 2 hours after issue, or a domestic flight leaves within 4 hours of issue, the normal voluntary refund fees apply. The pages reviewed for China Eastern, China Southern and Hainan Airlines describe no equivalent free-cancellation window, and the CAAC text sets no general one. For those airlines, treat the change and refund conditions of your fare as final from the moment you pay.

If the airline delays or cancels

CAAC's Regulation separates the airline's fault from everything else. "Reasons attributable to the carrier" cover internal management such as aircraft maintenance, flight dispatching and crew deployment. Weather, emergencies, air traffic control, security checks and passenger factors are not attributable to the carrier.

• Change: if the carrier is at fault, it must reissue the ticket on another flight with seats, or endorse it to another airline with that airline's consent, without charging a change fee (Article 24). If the cause is not the carrier's, the airline's general conditions apply.
• Refund: an involuntary refund carries no fee (Article 25). The definition includes cancellation, delay, early departure, changed segments, a changed cabin class, or the carrier being unable to operate the flight.
• Speed: the carrier or its agent must finish the refund within 7 working days of receiving a valid request, not counting processing time at banks (Article 26). Working days start counting from the next day (Article 64).
• China Eastern: a departure delay of more than 15 minutes, cancellation, early departure, itinerary change, physical cabin downgrade, or inability to operate the original flight allows one free involuntary change or a free refund. The free change is onto a China Eastern flight within 3 days before or after the original flight; if no seat is available in that window, it may be changed to the nearest available China Eastern flight free of charge. A change fee already collected is not refunded.
• China Southern: if the delay or cancellation at the origin airport is the airline's own doing (for example aircraft maintenance, flight readjustment or aircrew), it provides services such as meals or accommodation. For weather, accidents or air traffic control, it helps you obtain meals or accommodation at your own expense.
• Delay compensation: China Eastern's general conditions (July 2026, Article 9.2.5) set a one-time payment when a delay or cancellation is the airline's own doing: RMB 200 for a delay of 4 hours to under 8 hours, and RMB 400 for 8 hours or more. Infant tickets get 10% of those rates. It is paid by agreement in cash, vouchers, travel expense certificates or Eastern Miles points. The other airline pages cited here give no fixed amount.

If you have a complaint, the Regulation says the seller or airline must offer a solution within 10 working days of receiving it (Article 52).

Baggage on domestic flights

Limits differ by airline, route, cabin and ticket. The booking page must show the free allowance for your flight (Article 15 of the CAAC Regulation), and that display governs. Air China's and China Eastern's domestic numbers are not listed here.

China Southern figures come from its domestic booking notes; on codeshare flights, the operating airline's baggage rules apply. Hainan's prepaid rules (prepaid baggage page, carry-on page):

• It covers domestic flights operated by Hainan Airlines (HU), and domestic connections where every segment is operated by HU, with an 880 e-ticket. Codeshare flights where Hainan is only the marketing carrier are excluded.
• Buy from ticket issue until 2 hours before departure, and always before check-in. The price and currency are whatever the system shows.
• A refund is free before check-in, through the channel where you bought. Prepaid baggage products must be refunded together and in full: if you bought two items, you must refund both; a 10 kg allowance cannot be partly refunded.

Buying a ticket as a foreign visitor, and child fares

Airlines sell only to the passenger named on the ticket, and tickets cannot be transferred. China Southern says foreign tourists must present valid travel documents when buying, and the document you use at purchase must be the one you check in with. China Eastern says the same about ID at purchase and boarding (article 3.3.1.2), and CAAC Articles 29 and 31 require a carrier to refuse a passenger whose ID at check-in does not match the one used at purchase. Enter your details exactly as they appear on the document.

For child and infant tickets, China Southern asks for valid certificates such as household registers and birth certificates. Neither airline's page says how taxes and airport charges apply to a child ticket, so read the total before you pay. This guide gives no visa or entry advice.

Which should you choose?

Route yourself by how sure your plans are. The class letters in the first three rows refer to China Eastern's table above; China Southern's date rule is described in the change and refund section.

If your dates are inflexible and fall on a holiday, do not wait for a cheaper day the official pages cannot promise. A fare you buy stays as sold.

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