Email me when a flight fare drops below my target

Once a day, your fare provider's search endpoint is asked what one route costs on the date you want to fly, and the cheapest offer that comes back is compared with the price you would actually book at.

You are emailed on the change, not the state. The first day the fare sits at or below your target you get one alert with the price, plus the airline and a booking link where the provider supplies them. While it stays there you hear nothing more, and when it climbs back above your target you get a single note saying the watch is armed again. It knows what it has already told you by searching your own mailbox for the newest alert about this route, so nothing is repeated. If that search fails, nothing is sent rather than risk a duplicate, and once your departure date has passed the checks stop on their own.

You need a fare search endpoint and key from a travel data provider, answering with a list of offers that each carry a price.

Run every day.Run every day.

Set fareApiUrl to blank.Set fareApiUrl to blank.

Set fareApiToken to blank.Set fareApiToken to blank.

Set originAirport to blank.Set originAirport to blank.

Set destinationAirport to blank.Set destinationAirport to blank.

Set departureDate to blank.Set departureDate to blank.

Set returnDate to blank.Set returnDate to blank.

Set targetPrice to 0.Set targetPrice to 0.

Set currencyCode to USD.Set currencyCode to USD.

Set alertEmailAddress to blank.Set alertEmailAddress to blank.

Set priceTarget to 0.Set priceTarget to 0.

If a step below fails, save the error as targetPriceErrorIf a step below fails, save the error as targetPriceError

Try

Round targetPrice to 2 decimal places and save it as priceTarget.Round targetPrice to 2 decimal places and save it as priceTarget.

On error

Stop and report a problem: Put the most you are willing to pay into the 'targetPrice' step as a plain number - 450, not $450 or 1,450 - then run it again.Stop and report a problem: Put the most you are willing to pay into the 'targetPrice' step as a plain number - 450, not $450 or 1,450 - then run it again.

If priceTarget is less than or equal to 0If priceTarget is less than or equal to 0

Yes

Stop and report a problem: The 'targetPrice' step is still 0, so no fare could ever count as a drop. Set it to the most you are willing to pay, then run it again.Stop and report a problem: The 'targetPrice' step is still 0, so no fare could ever count as a drop. Set it to the most you are willing to pay, then run it again.

No

No steps

Set daysUntilDeparture to 0.Set daysUntilDeparture to 0.

If a step below fails, save the error as departureDateErrorIf a step below fails, save the error as departureDateError

Try

Count the days from today's date to departureDate and save it as daysUntilDeparture.Count the days from today's date to departureDate and save it as daysUntilDeparture.

On error

Stop and report a problem: The 'departureDate' step is not a date this workflow can read. Write it as 2026-11-14, then run it again.Stop and report a problem: The 'departureDate' step is not a date this workflow can read. Write it as 2026-11-14, then run it again.

If daysUntilDeparture is less than 0If daysUntilDeparture is less than 0

Yes

Finish the run: The date in the 'departureDate' step has already passed, so there is nothing left to watch on this route. Set a new date to start watching again.Finish the run: The date in the 'departureDate' step has already passed, so there is nothing left to watch on this route. Set a new date to start watching again.

No

No steps

Set routeLabel to originAirport to destinationAirport.Set routeLabel to originAirport to destinationAirport.

Set watchTag to Fare watch originAirport-destinationAirport departureDate.Set watchTag to Fare watch originAirport-destinationAirport departureDate.

Set underTargetMarker to fare is under your target.Set underTargetMarker to fare is under your target.

Set aboveTargetMarker to fare is back above your target.Set aboveTargetMarker to fare is back above your target.

Set fareSearch to a record of origin, destination, departure date, and currency.Set fareSearch to a record of origin, destination, departure date, and currency.

Set returnLine to blank.Set returnLine to blank.

If returnDate isn't blankIf returnDate isn't blank

Yes

Change fareSearch to a record of origin, destination, departure date, and 2 more.Change fareSearch to a record of origin, destination, departure date, and 2 more.

Change returnLine to Returning: returnDateChange returnLine to Returning: returnDate .

No

No steps

Set fareResponse to an empty record.Set fareResponse to an empty record.

If a step below fails, save the error as fareApiErrorIf a step below fails, save the error as fareApiError

Try

Fetch fareApiUrl and save it as fareResponse.Fetch fareApiUrl and save it as fareResponse.

On error

Stop and report a problem: The fare search did not answer, so no fare was checked. Check the address in the 'fareApiUrl' step and the key in the 'fareApiToken' step. The endpoint said: fareApiError as text.Stop and report a problem: The fare search did not answer, so no fare was checked. Check the address in the 'fareApiUrl' step and the key in the 'fareApiToken' step. The endpoint said: fareApiError as text.

Set offers to fareResponse.body.offers.Set offers to fareResponse.body.offers.

Set offerCount to 0.Set offerCount to 0.

If a step below fails, save the error as fareShapeErrorIf a step below fails, save the error as fareShapeError

Try

Count the items in offers and save it as offerCount.Count the items in offers and save it as offerCount.

On error

Stop and report a problem: The fare search answered in a shape this workflow cannot read. The endpoint in the 'fareApiUrl' step has to answer with a JSON object holding a list called 'offers', and each offer needs a number in 'price'.Stop and report a problem: The fare search answered in a shape this workflow cannot read. The endpoint in the 'fareApiUrl' step has to answer with a JSON object holding a list called 'offers', and each offer needs a number in 'price'.

If offerCount is 0If offerCount is 0

Yes

Finish the run: No fares came back for routeLabel on departureDate, so there was nothing to compare with your target.Finish the run: No fares came back for routeLabel on departureDate, so there was nothing to compare with your target.

No

No steps

Set bestPrice to 0.Set bestPrice to 0.

Set bestOffer to an empty record.Set bestOffer to an empty record.

Set pricedOffers to 0.Set pricedOffers to 0.

Set skippedOffers to 0.Set skippedOffers to 0.

For each offer in offers:For each offer in offers:

Set offerPrice to 0.Set offerPrice to 0.

Set offerHasPrice to false.Set offerHasPrice to false.

If a step below fails, save the error as offerPriceErrorIf a step below fails, save the error as offerPriceError

Try

Round offer.price to 2 decimal places and save it as offerPrice.Round offer.price to 2 decimal places and save it as offerPrice.

Change offerHasPrice to true.Change offerHasPrice to true.

On error

Add 1 to skippedOffers.Add 1 to skippedOffers.

If offerHasPrice is yesIf offerHasPrice is yes

Yes

If pricedOffers is 0 or offerPrice is less than bestPriceIf pricedOffers is 0 or offerPrice is less than bestPrice

Yes

Change bestPrice to offerPrice.Change bestPrice to offerPrice.

Change bestOffer to offer.Change bestOffer to offer.

No

No steps

Add 1 to pricedOffers.Add 1 to pricedOffers.

No

No steps

If skippedOffers is greater than 0If skippedOffers is greater than 0

Yes

Show in the output: Skipped skippedOffers offer(s) that carried no usable price. Each offer needs a number in 'price'.Show in the output: Skipped skippedOffers offer(s) that carried no usable price. Each offer needs a number in 'price'.

No

No steps

If pricedOffers is 0If pricedOffers is 0

Yes

Stop and report a problem: The fare search returned offerCount offer(s) but none of them carried a number in 'price', so no fare could be compared with your target.Stop and report a problem: The fare search returned offerCount offer(s) but none of them carried a number in 'price', so no fare could be compared with your target.

No

No steps

Set airlineLine to blank.Set airlineLine to blank.

If a step below fails, save the error as airlineErrorIf a step below fails, save the error as airlineError

Try

Trim bestOffer.airline and save it as airlineText.Trim bestOffer.airline and save it as airlineText.

If airlineText isn't emptyIf airlineText isn't empty

Yes

Change airlineLine to Airline: airlineTextChange airlineLine to Airline: airlineText .

No

No steps

On error

Change airlineLine to blank.Change airlineLine to blank.

Set bookingLine to blank.Set bookingLine to blank.

If a step below fails, save the error as bookingLinkErrorIf a step below fails, save the error as bookingLinkError

Try

Trim bestOffer.link and save it as linkText.Trim bestOffer.link and save it as linkText.

If linkText isn't emptyIf linkText isn't empty

Yes

Change bookingLine to Book here: linkTextChange bookingLine to Book here: linkText .

No

No steps

On error

Change bookingLine to blank.Change bookingLine to blank.

GmailList emails matching 'subject:@watchTag'. Save it as priorAlerts.List emails matching 'subject:@watchTag'. Save it as priorAlerts.

Set priorMessages to priorAlerts.emails.Set priorMessages to priorAlerts.emails.

Set priorAlertCount to 0.Set priorAlertCount to 0.

If a step below fails, save the error as alertHistoryErrorIf a step below fails, save the error as alertHistoryError

Try

Count the items in priorMessages and save it as priorAlertCount.Count the items in priorMessages and save it as priorAlertCount.

On error

Stop and report a problem: Could not read your mailbox to see what this watch has already reported, so nothing was sent rather than risk repeating an alert. Reconnect Gmail and run it again.Stop and report a problem: Could not read your mailbox to see what this watch has already reported, so nothing was sent rather than risk repeating an alert. Reconnect Gmail and run it again.

Set newestAlertSubject to blank.Set newestAlertSubject to blank.

If priorAlertCount is greater than 0If priorAlertCount is greater than 0

Yes

If a step below fails, save the error as alertSubjectErrorIf a step below fails, save the error as alertSubjectError

Try

Trim the first item of priorMessages.subject and save it as newestAlertSubject.Trim the first item of priorMessages.subject and save it as newestAlertSubject.

On error

Change newestAlertSubject to blank.Change newestAlertSubject to blank.

No

No steps

Check whether newestAlertSubject contains underTargetMarker and save it as alreadyReported.Check whether newestAlertSubject contains underTargetMarker and save it as alreadyReported.

Set fareIsUnderTarget to bestPrice is less than or equal to priceTarget.Set fareIsUnderTarget to bestPrice is less than or equal to priceTarget.

If fareIsUnderTarget is yes and alreadyReported is noIf fareIsUnderTarget is yes and alreadyReported is no

Yes

GmailSend an email to alertEmailAddress.Send an email to alertEmailAddress. Subject: watchTag - underTargetMarkerA fare on this route has dropped below your target. Route: routeLabel Leaving: departureDate returnLineCheapest fare found: currencyCode bestPrice formatted as a number with thousands separators with 2 decimal places Your target: currencyCode priceTarget formatted as a n...

Else if @alreadyReported is yes and @fareIsUnderTarget is no

GmailSend an email to alertEmailAddress.Send an email to alertEmailAddress. Subject: watchTag - aboveTargetMarkerThe fare you were told about has gone back above your target. Route: routeLabel Leaving: departureDate returnLineCheapest fare now: currencyCode bestPrice formatted as a number with thousands separators with 2 decimal places Your target: currencyCode priceTarget formatte...

Otherwise

Show in the output: Cheapest fare for routeLabel on departureDate is currencyCode bestPrice formatted as a number with thousands separators with 2 decimal places against a target of currencyCode priceTarget formatted as a number with thousands separators with 2 decimal places. Nothing has changed since the last email, so none was sent.Show in the output: Cheapest fare for routeLabel on departureDate is currencyCode bestPrice formatted as a number with thousands separators with 2 decimal places against a target of currencyCode priceTarget formatted as a number with thousands separators with 2 decimal places. Nothing has changed since the last email, so none was sent.