Add round-trip date validation and 12-month booking window

- Return date picker constrained to >= departure date, auto-adjusts if departure moves past it
- Return flights filtered to depart at least 1 hour after outbound arrival
- Both date pickers capped at 12 months from today
- Backend validates return date >= departure date and 12-month max window

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/api/search.py

@@ -2,6 +2,8 @@
 
 from __future__ import annotations
 
+from datetime import date, timedelta
+
 from fastapi import APIRouter, HTTPException
 
 from ..config import (
@@ -15,7 +17,7 @@ from ..config import (
 from ..data_loader import get_route_graph
 from ..flight_generator import generate_flights_for_route
 from ..hub_detector import compute_hub_scores
-from ..models import FlightOffer, SearchRequest, SearchResponse, SortBy
+from ..models import FlightOffer, SearchRequest, SearchResponse, SortBy, TripType
 from ..route_finder import find_routes
 from ..seed_utils import make_seed
 
@@ -137,6 +139,23 @@ async def search_flights(req: SearchRequest):
         if leg.destination.upper() not in graph.airports:
             raise HTTPException(status_code=404, detail=f"Airport {leg.destination} not found")
 
+    # Validate booking window: flights can only be booked up to 12 months in advance
+    max_date = date.today() + timedelta(days=365)
+    for leg in req.legs:
+        if leg.date > max_date:
+            raise HTTPException(
+                status_code=400,
+                detail="Flights can only be booked up to 12 months in advance",
+            )
+
+    # Validate round-trip date order: return date must be >= departure date
+    if req.trip_type == TripType.round_trip and len(req.legs) >= 2:
+        if req.legs[1].date < req.legs[0].date:
+            raise HTTPException(
+                status_code=400,
+                detail="Return date must be on or after the departure date",
+            )
+
     # Generate outbound flights
     outbound_leg = req.legs[0]
     origin = outbound_leg.origin.upper()

frontend/dist/assets/index-C3NB9eo7.css

@@ -0,0 +1 @@
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frontend/dist/index.html

@@ -0,0 +1,14 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <link rel="icon" type="image/svg+xml" href="/vite.svg" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Flight Search</title>
+    <script type="module" crossorigin src="/assets/index-BxpJmc2v.js"></script>
+    <link rel="stylesheet" crossorigin href="/assets/index-C3NB9eo7.css">
+  </head>
+  <body>
+    <div id="root"></div>
+  </body>
+</html>

frontend/src/components/search/DatePicker.tsx

@@ -2,16 +2,20 @@ interface Props {
   label: string;
   value: string; // YYYY-MM-DD
   onChange: (v: string) => void;
+  min?: string; // YYYY-MM-DD
+  max?: string; // YYYY-MM-DD
   testId?: string;
 }
 
-export default function DatePicker({ label, value, onChange, testId }: Props) {
+export default function DatePicker({ label, value, onChange, min, max, testId }: Props) {
   return (
     <div className="relative min-w-[150px]" data-testid={testId}>
       <label className="absolute -top-2 left-3 bg-white px-1 text-xs text-gray-500 z-10">{label}</label>
       <input
         type="date"
         value={value}
+        min={min}
+        max={max}
         onChange={e => onChange(e.target.value)}
         className="w-full rounded-md border border-gray-300 px-3 py-3 text-sm text-gray-900 hover:border-gray-400 focus:border-[#1a73e8] focus:outline-none cursor-pointer"
         aria-label={label}

frontend/src/components/search/SearchForm.tsx

@@ -1,6 +1,6 @@
 import { useState } from 'react';
 import type { CabinClass, Passengers, TripType } from '../../api/types';
-import { getDefaultDepartureDate, getDefaultReturnDate } from '../../utils/date';
+import { getDefaultDepartureDate, getDefaultReturnDate, getMaxBookingDate } from '../../utils/date';
 import AirportInput from './AirportInput';
 import ClassSelector from './ClassSelector';
 import DatePicker from './DatePicker';
@@ -34,6 +34,15 @@ export default function SearchForm({ initial, onSearch, compact }: Props) {
   const [destinationDisplay, setDestinationDisplay] = useState(initial?.destinationDisplay || '');
   const [departureDate, setDepartureDate] = useState(initial?.departureDate || getDefaultDepartureDate());
   const [returnDate, setReturnDate] = useState(initial?.returnDate || getDefaultReturnDate());
+  const maxDate = getMaxBookingDate();
+
+  // Auto-adjust return date if it falls before departure date
+  function handleDepartureDateChange(newDate: string) {
+    setDepartureDate(newDate);
+    if (returnDate < newDate) {
+      setReturnDate(newDate);
+    }
+  }
   const [passengers, setPassengers] = useState<Passengers>(initial?.passengers || { adults: 1, children: 0, infants: 0 });
   const [cabinClass, setCabinClass] = useState<CabinClass>(initial?.cabinClass || 'economy');
 
@@ -87,7 +96,8 @@ export default function SearchForm({ initial, onSearch, compact }: Props) {
         <DatePicker
           label="Departure"
           value={departureDate}
-          onChange={setDepartureDate}
+          onChange={handleDepartureDateChange}
+          max={maxDate}
           testId="departure-date"
         />
 
@@ -96,6 +106,8 @@ export default function SearchForm({ initial, onSearch, compact }: Props) {
             label="Return"
             value={returnDate}
             onChange={setReturnDate}
+            min={departureDate}
+            max={maxDate}
             testId="return-date"
           />
         )}

frontend/src/pages/ResultsPage.tsx

@@ -70,19 +70,27 @@ export default function ResultsPage() {
     return map;
   }, [outboundFlights, returnFlights, sameAirlineDiscount, isRoundTrip]);
 
+  // Filter return flights: must depart at least 1 hour after outbound arrival
+  const eligibleReturnFlights = useMemo(() => {
+    if (!selectedOutbound) return returnFlights;
+    const outboundArrival = new Date(selectedOutbound.arrival).getTime();
+    const minDepartureTime = outboundArrival + 60 * 60 * 1000; // +1 hour
+    return returnFlights.filter(f => new Date(f.departure).getTime() >= minDepartureTime);
+  }, [returnFlights, selectedOutbound]);
+
   // Memoized: round-trip total for each return flight (given selected outbound)
   const returnRoundTripPrices = useMemo(() => {
     if (!selectedOutbound) return new Map<string, number>();
     const map = new Map<string, number>();
-    for (const ret of returnFlights) {
+    for (const ret of eligibleReturnFlights) {
       map.set(ret.id, roundTripTotal(selectedOutbound, ret, sameAirlineDiscount));
     }
     return map;
-  }, [returnFlights, selectedOutbound, sameAirlineDiscount]);
+  }, [eligibleReturnFlights, selectedOutbound, sameAirlineDiscount]);
 
   // Client-side filter + sort the results
   const filteredFlights = useMemo(() => {
-    let flights = showingReturn ? returnFlights : outboundFlights;
+    let flights = showingReturn ? eligibleReturnFlights : outboundFlights;
 
     if (filters.max_stops !== null && filters.max_stops !== undefined) {
       flights = flights.filter(f => f.stops <= filters.max_stops!);
@@ -130,7 +138,7 @@ export default function ResultsPage() {
     }
 
     return flights;
-  }, [outboundFlights, returnFlights, showingReturn, isRoundTrip, selectedOutbound, outboundMinPrices, returnRoundTripPrices, filters, sortBy]);
+  }, [outboundFlights, eligibleReturnFlights, showingReturn, isRoundTrip, selectedOutbound, outboundMinPrices, returnRoundTripPrices, filters, sortBy]);
 
   // Split into "best" and "other" flights
   const bestFlights = useMemo(() => filteredFlights.filter(f => f.is_best), [filteredFlights]);
@@ -231,7 +239,7 @@ export default function ResultsPage() {
             <aside className="hidden lg:block w-64 flex-shrink-0">
               <div className="sticky top-4 rounded-lg bg-white p-4 shadow-sm">
                 <FilterPanel
-                  flights={showingReturn ? returnFlights : outboundFlights}
+                  flights={showingReturn ? eligibleReturnFlights : outboundFlights}
                   filters={filters}
                   onChange={setFilters}
                 />

frontend/src/utils/date.ts

@@ -16,6 +16,12 @@ export function getDefaultReturnDate(): string {
   return toDateString(addDays(new Date(), 21));
 }
 
+export function getMaxBookingDate(): string {
+  const d = new Date();
+  d.setMonth(d.getMonth() + 12);
+  return toDateString(d);
+}
+
 export function getDaysInMonth(year: number, month: number): number {
   return new Date(year, month, 0).getDate();
 }