Flight Change vs Cancel & Rebook Calculator
Compare change charges against your net refund and a new ticket quote.
Find the additional cost, break-even fare and funding needed before the refund arrives.
Starting values are fictional. Replace them with actual quotes from your ticket seller.
Enter totals for the same travelers and unused segments in one currency. The refund is net of deductions. Unknown charges are not zero.
Comparison results
Comparison pending — amounts below are provisional
A · change additional net cost
KRW 300,000
Reference total including original payment: KRW 1,500,000
B · cancel and rebook additional net cost
KRW 230,000
Reference total including original payment: KRW 1,430,000
- Additional cost difference (B − A)
- KRW -70,000
- Break-even new ticket total
- KRW 1,170,000
- Entered net refund
- KRW 900,000
- Upfront funding for rebooking
- KRW 1,130,000
With other inputs unchanged, rebooking costs less below the break-even total; changing costs less above it. A negative B − A favors rebooking.
A negative net cost means refunds exceed new outlays. The original payment is not added again to the comparison difference. Reference totals also include already used segments.
Separate cancellation charges are assumed due before the refund, so fund at least those charges even with an early refund. For a later or unconfirmed refund, fund the new total and separate charges first. Verify actual card-limit restoration. Change net cost also differs from peak funding when charges and refunds settle at different times.
Next: verify the comparison with your seller before paying.
Before requesting a change or cancellation, confirm seats, quote expiry, deducted charges, net refund and card processing. This comparison does not determine airline disruption compensation or legal refund rights.
Sources checked: 2026-09-19 · No live fee or FX lookup
What does changing versus cancelling and rebooking compare?
A low cancellation fee does not guarantee that cancelling a ticket and buying another is cheaper.
The replacement fare may have increased, or baggage included in the original booking may now cost extra.
This calculator compares a quote to change an existing ticket with the net cost of cancelling it and purchasing a replacement on matching terms.
A decision for family travel
When rescheduling a trip for your parents or the whole family, obtain totals for everyone affected.
Separate money already paid from money that will leave or return from now on.
The comparison helps you decide which request to take to your ticket seller.
It does not calculate compensation for airline delays or cancellations, or determine legal refund rights.
Input meanings and avoiding double counting
Original payment and unused segments
Original payment means the entire amount already paid for the ticket and included extras.
Select wholly unused or partly used, and note the travelers and segments being compared.
This payment appears only in the reference lifetime totals.
It is not repeatedly added to the additional cost difference.
Change fee, fare difference and extra charges
Enter the change fee, fare and tax adjustment, and other change charges separately.
If the seller gives you only one combined additional payment, enter that total once in the difference field and set the other two to zero.
Entering the breakdown as well as the total counts the same cost twice.
Net refund and separate cancellation charges
The net refund is the cash or card amount actually returned after deductions.
Do not enter an already deducted cancellation fee again as a separate charge.
That field is only for amounts billed outside the refund, such as an additional agency charge.
Do not include miles or travel vouchers in the cash refund.
New ticket total and manual FX
The replacement total includes taxes, surcharges, required seats, baggage and booking fees.
Use one currency for every quote and enter KRW per one unit of that currency.
Divide an exchange quote per 100 yen by 100.
If you know actual KRW payment and refund values from different conversion dates, use those in KRW mode instead.
Additional net cost and break-even formulas
A: change the existing booking
A = F + D + O.
F is the change fee, D the fare and tax difference, and O other change charges.
A confirmed cash refund of the fare difference can be negative.
Finding a lower advertised fare does not establish that the seller will refund the difference.
B: cancel and buy a replacement
B = N + E − R.
N is the final replacement total, E cancellation charges outside the net refund, and R the confirmed net refund.
A and B measure additional net outlays from now on.
Neither includes the common original payment P.
The replacement price that reverses the result
N* = A + R − E.
Holding all other inputs constant, a replacement total below N* makes rebooking cheaper; a higher price makes changing cheaper.
A negative B − A favors rebooking, a positive value favors changing, and zero is a tie.
Reference total and rounding
Reference total outlays are P + A and P + B.
For partly used tickets these still include money paid for flown segments, so they are not the isolated cost of the remaining flight.
Each foreign-currency amount is converted and rounded to whole KRW before comparison.
The break-even price shown in quote currency is approximate because of this per-item rounding.
Step-by-step instructions
Ask your seller for a change quote and net refund quote for the same dates, travelers and unused segments.
Obtain the final checkout total for a replacement with matching seats and baggage.Enter the original payment, unused segments, currency and quote date.
Changing the selected currency does not automatically convert the numbers.
Check every amount and the exchange rate together.
The initial foreign FX value of 1 is not a live market rate.Enter the three change components and the three cancellation and replacement components.
A zero means a confirmed free or uncharged item.
Do not substitute zero for an unknown quote and treat the result as final.Set each option to confirmed available, unavailable or unknown.
Confirm matching conditions and verified quotes, then specify whether the refund is actually usable before the new purchase.
Editing an amount clears quote confirmation so that you can review it again.Compare additional net cost, break-even price and upfront funding, then save the TXT comparison.
Verify the amounts and quote expiry with the seller before making your request.
Saving the report does not book or cancel a ticket.
A worked example using fictional quotes
Assume an original payment of KRW 1,200,000, a change fee of 100,000, a fare and tax difference of 180,000 and other change charges of 20,000.
Cancelling returns a net refund of 900,000, incurs a separate charge of 30,000 and requires a replacement ticket costing 1,100,000.
These are fictional amounts for explaining the arithmetic, not an airline tariff.
| Comparison | A: change | B: cancel and rebook |
|---|---|---|
| Additional net cost | 300,000 | 230,000 |
| Total including original payment | 1,500,000 | 1,430,000 |
If both options are available and the quotes are confirmed, rebooking is KRW 70,000 cheaper.
The break-even replacement total is 1,170,000.
At that new price the two choices tie; above it changing costs less.
Editing only the original payment does not change the additional cost difference or break-even price.
Interpreting break-even prices and negative results
When refunds exceed new spending
A negative rebooking net cost means the refund exceeds the new ticket total and separate charges.
It does not erase money already paid or make the trip profitable.
Keep the negative value and check the reference total as well.
For example, a zero replacement price, KRW 900,000 net refund and 30,000 separate charge give B = −870,000.
When the break-even price is negative
A cash refund under the change option can make the break-even price negative.
With zero change fee and other charges, a fare difference of KRW −100,000, zero cancellation refund and a separate cancellation charge of 30,000, the break-even price is −130,000.
No nonnegative replacement price makes rebooking cheaper under those assumptions.
An unavailable cancellation and rebooking option is not recommended simply because its hypothetical cost is lower.
Net cost is different from funding needed now
In the example, rebooking has a net cost of KRW 230,000.
If the refund comes later, however, you must first fund the new ticket of 1,100,000 and separate charge of 30,000: KRW 1,130,000 in total.
If the 900,000 refund is actually usable before the new purchase, additional funding falls to 230,000.
Unknown timing is treated like a later refund.
Separate cancellation charges are assumed due before the refund.
With an early refund, funding is the greater of the separate cancellation charge and the additional net cost; even a negative net cost still requires the initial KRW 30,000 charge in this example.
Check the card limit and usable refund
Refund approval does not necessarily mean that your card limit has recovered or that cash is available in your account.
Select the before-purchase state only when the refund can actually fund the payment.
The funding estimate does not subtract your existing cash or card limit.
Likewise, if change fees are paid before a fare refund arrives, peak funding may exceed the displayed change net cost.
Ask the seller about the payment sequence.
Partly used tickets, family groups and foreign quotes
Changing only the return leg
After flying outbound, obtain a change quote for the remaining journey and the actual net refund.
Do not halve the round-trip payment or use a currently advertised one-way fare to value the flown segment yourself.
Keep the full original payment for reference and identify the unused segments in the note.
The ticket issuer must confirm the use history and settlement.
Different rules within a family
If parents and children have different fares or refund conditions, add their individually confirmed quotes.
When everyone must travel together, verify that enough replacement seats are available on matching terms.
If only part of the family can change, calculate the groups separately.
Check child fares, discounts and the scope of each fee before simply multiplying a per-person amount.
Converting a quote with one FX assumption
For a fictional USD example, use P = 1,000, F = 80, D = 150, O = 20, R = 750, E = 25, N = 900 and KRW 1,300 per USD.
The change net cost is KRW 325,000, rebooking 227,500, and B − A is −97,500.
Break-even is KRW 1,267,500 or USD 975, and funding before the refund is KRW 1,202,500.
The exchange rate is illustrative.
This does not forecast FX gains or losses between payment and refund dates.
Limits and practical cautions
Free-cancellation periods, waivers and change restrictions are not automatically determined.
Obtain a confirmed quote for the actual contract, including the route, origin, fare, issuer, ticketing date and request timing.Miles, coupons and vouchers are not cash.
This comparison includes actual cash or card refunds, not benefits that cannot be used as cash.Hotel cancellation costs, transport to another airport, time off work, the value of time and newly earned miles are not automatically included.
Match the travel conditions and consider these separately in your budget.A searched price may change before payment.
Even when the arithmetic favors rebooking, cancelling the old reservation before verifying replacement seats and refund terms can leave you unable to purchase the same itinerary.Each amount is limited to 100 million quote-currency units.
KRW inputs are whole won; foreign amounts allow two decimals and the FX rate four.
These are product input limits, not airline restrictions.
Cash refunds exceeding the original payment and invalid dates block results.
Frequently asked questions
Is the cancellation fee alone enough?
No.
You need the actual net refund and the final new ticket total.
The same cancellation fee can lead to different additional costs when the refundable amount or new fare changes.
Obtain the change quote too.
How do I enter a refund already net of fees?
Enter the quoted refund directly as R.
Do not add the deducted fee again under separate cancellation charges.
Enter only amounts you must pay outside the refund in that field.
Does a zero change fee always favor changing?
No.
Fare and tax adjustments may be larger.
Compare the complete change total A with cancellation and rebooking net cost B, including other charges.
Does it calculate refunds for partly used tickets?
No.
Obtain the seller’s confirmed net refund after the flown segments and contract rules are accounted for.
Do not halve the original round-trip payment.
Does a refund approval notification mean the money arrived first?
Check whether it can actually fund the replacement purchase.
Card processing and limit restoration can differ, so approval alone is not enough to select the before-purchase state.
Can I enter a negative difference for a cheaper replacement fare?
Only if the seller confirms a cash or card refund of that difference.
Do not enter a nonrefundable fare reduction or travel credit as a cash refund.
What happens if changing is prohibited or seats are unconfirmed?
Set the availability of each option.
Unknown options keep the comparison provisional.
If only one is available, the result states that limitation.
If neither is available, neither is recommended based on cost.
Do the English version and foreign quotes use the same math?
Yes.
Both languages share the same pure calculation function.
Quotes entered in one currency with the same FX rate produce the same KRW results using per-item rounding.
The TXT report includes currency, exchange rate and confirmation status.
Official sources and verification date
Sources were checked on 2026-09-19.
Korean Air describes refund penalties varying by fare, origin, currency and request timing.
Asiana explains seller-specific change rules, fare and tax adjustments, fees and differences in refund receipt timing.
Its online booking guide also describes settlement for partly used tickets.
- Korean Air international fares and service fees
- Asiana ticket changes and refunds
- Asiana online booking guide
This is quote arithmetic with results in KRW, not a Korean statutory refund or compensation calculation.
The source check date is not an effective tariff date or a live quote update.
Recheck contract terms, refund method, seat availability and charges with the ticket seller before requesting a change.
Save the comparison and confirm your request
Save your unused segments, quote date, change and rebooking costs, net refund and upfront funding as TXT.
Ask the seller what the change quote includes, whether the refund is the final amount you will receive, whether agency charges are separate, and whether the quoted seats are currently available.
If a price changes, recalculate before relying on an earlier report.
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