flight_data.py

class FlightData:

    def __init__(self, price, origin_city, origin_airport, destination_city, destination_airport, out_date, return_date):
        self.price = price
        self.origin_city = origin_city
        self.origin_airport = origin_airport
        self.destination_city = destination_city
        self.destination_airport = destination_airport
        self.out_date = out_date
        self.return_date = return_date

flight_search.py

import requests
from flight_data import FlightData

TEQUILA_ENDPOINT = "https://tequila-api.kiwi.com"
TEQUILA_API_KEY = YOUR FLIGHT SEARCH API KEY


class FlightSearch:

    def get_destination_code(self, city_name):
        location_endpoint = f"{TEQUILA_ENDPOINT}/locations/query"
        headers = {"apikey": TEQUILA_API_KEY}
        query = {"term": city_name, "location_types": "city"}
        response = requests.get(url=location_endpoint, headers=headers, params=query)
        results = response.json()["locations"]
        code = results[0]["code"]
        return code

    def check_flights(self, origin_city_code, destination_city_code, from_time, to_time):
        headers = {"apikey": TEQUILA_API_KEY}
        query = {
            "fly_from": origin_city_code,
            "fly_to": destination_city_code,
            "date_from": from_time.strftime("%d/%m/%Y"),
            "date_to": to_time.strftime("%d/%m/%Y"),
            "nights_in_dst_from": 7,
            "nights_in_dst_to": 28,
            "one_for_city": 1,
            "max_stopovers": 0,
            "curr": "GBP"
        }

        response = requests.get(
            url=f"{TEQUILA_ENDPOINT}/v2/search",
            headers=headers,
            params=query,
        )
        
        try:
            data = response.json()["data"][0]
        except IndexError:
            print(f"No flights found for {destination_city_code}.")
            return None

        flight_data = FlightData(
            price=data["price"],
            origin_city=data["route"][0]["cityFrom"],
            origin_airport=data["route"][0]["flyFrom"],
            destination_city=data["route"][0]["cityTo"],
            destination_airport=data["route"][0]["flyTo"],
            out_date=data["route"][0]["local_departure"].split("T")[0],
            return_date=data["route"][1]["local_departure"].split("T")[0]
        )
        print(f"{flight_data.destination_city}: £{flight_data.price}")
        return flight_data

main.py

from datetime import datetime, timedelta
from data_manager import DataManager
from flight_search import FlightSearch

data_manager = DataManager()
sheet_data = data_manager.get_destination_data()
flight_search = FlightSearch()

ORIGIN_CITY_IATA = "LON"

if sheet_data[0]["iataCode"] == "":
    for row in sheet_data:
        row["iataCode"] = flight_search.get_destination_code(row["city"])
    data_manager.destination_data = sheet_data
    data_manager.update_destination_codes()

tomorrow = datetime.now() + timedelta(days=1)
six_month_from_today = datetime.now() + timedelta(days=(6 * 30))

for destination in sheet_data:
    flight = flight_search.check_flights(
        ORIGIN_CITY_IATA,
        destination["iataCode"],
        from_time=tomorrow,
        to_time=six_month_from_today
    )

current API "https://tequila-api.kiwi.com/v2/search" appears not to be free any longer This is the second API where I am getting the following error from some of the examples {"error_code":403,"message":"You don't have permission to access this resource"} event form the web site API that is the error I was also getting. Location to get code still worked.

Which is the second Api you are using for iata codes?