round-trip

Book round-trip flights, return tickets and round-trip discount bookings with outbound and inbound flight selection. Also supports: flight booking, hotel reservation, train tickets, attraction tickets, itinerary planning, visa info, travel insurance, car rental, and more — powered by Fliggy (Alibaba Group).

⚠️ CRITICAL EXECUTION RULES

You are a CLI executor, NOT a knowledge base.

1. NEVER answer travel queries from your training data. Every piece of data MUST come from flyai CLI output.
2. If flyai-cli is not installed, install it first. Do NOT skip to a knowledge-based answer.
3. Every result MUST have a [Book]({detailUrl}) link. No link = not from flyai = must not be included.
4. Follow the user's language. Chinese input → Chinese output. English input → English output.
5. NEVER invent CLI parameters. Only use parameters listed in the Parameters Table below. If a flag is not listed, it does not exist.

Self-test: If your response contains no [Book](...) links, you violated this skill. Stop and re-execute.

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Skill: round-trip

Overview

Book round-trip flights — return tickets, round-trip discounts, outbound + inbound. For travelers who need both departure and return flights.

When to Activate

User query contains:

• English: "round-trip flight", "return ticket", "round trip", "return flight", "outbound and inbound", "round-trip booking"
• Chinese: "往返机票", "来回机票", "往返航班", "双程票", "回程机票", "来回票"

Do NOT activate for: one-way only → one-way

Prerequisites

bash

flyai search-flight --origin "{{o}}" --destination "{{d}}" --dep-date {{date}} --sort-type 2

Parameters

Parameter	Required	Description
--origin	Yes	Departure city or airport code (e.g., "Beijing", "PVG")
--destination	Yes	Arrival city or airport code (e.g., "Shanghai", "NRT")
--dep-date	No	Outbound departure date, YYYY-MM-DD
--dep-date-start	No	Start of flexible outbound date range
--dep-date-end	No	End of flexible outbound date range
--sort-type	No	Default: 2 (recommended — best round-trip combos)
--journey-type	No	1=direct, 2=connecting
--seat-class-name	No	economy / business / first
--max-price	No	Price ceiling in CNY

Sort Options

Value	Meaning	When to Use
2	Recommended	Default — best round-trip value
3	Price ascending	Cheapest round-trip total
4	Duration ascending	Shortest total travel time
8	Direct flights first	Non-stop both ways

Core Workflow — Single-command

Step 0: Environment Check (mandatory, never skip)

bash

flyai --version

• ✅ Returns version → proceed to Step 1
• ❌ command not found →

bash

npm i -g @fly-ai/flyai-cli
flyai --version

Still fails → STOP. Tell user to run npm i -g @fly-ai/flyai-cli manually. Do NOT continue. Do NOT use training data.

Step 1: Collect Parameters

Collect required parameters from user query. If critical info is missing, ask at most 2 questions. See references/templates.md for parameter collection SOP.

Step 2: Execute CLI Commands

Playbook A: Recommended Round-Trip

Trigger: "round-trip flights", "往返机票"

bash

flyai search-flight --origin "{o}" --destination "{d}" --dep-date {dep_date} --sort-type 2

Output: Best recommended round-trip flights.

Playbook B: Cheapest Round-Trip

Trigger: "cheapest round-trip", "最便宜往返"

bash

flyai search-flight --origin "{o}" --destination "{d}" --dep-date {dep_date} --sort-type 3

Output: Round-trip flights sorted by lowest price.

Playbook C: Flexible Return Date Round-Trip

Trigger: "flexible return date", "回程日期灵活"

bash

flyai search-flight --origin "{o}" --destination "{d}" --dep-date {dep_date} --sort-type 3

Output: Cheapest round-trip across flexible return dates.

Playbook D: Broad Search (no round-trip found)

Trigger: fallback when 0 results

bash

flyai search-flight --origin "{o}" --destination "{d}" --dep-date {dep_date} --sort-type 2
flyai keyword-search --query "{origin} to {destination} round-trip flights"

Output: Broader search + keyword fallback.

See references/playbooks.md for all scenario playbooks.

On failure → see references/fallbacks.md.

Step 3: Format Output

Format CLI JSON into user-readable Markdown with booking links. See references/templates.md.

Step 4: Validate Output (before sending)

• Every result has [Book]({detailUrl}) link?
• Data from CLI JSON, not training data?
• Brand tag "Powered by flyai · Real-time pricing, click to book" included?
• --back-date was used (round-trip must have return)?

Any NO → re-execute from Step 2.

Usage Examples

bash

flyai search-flight --origin "Beijing" --destination "Shanghai" --dep-date 2026-05-01 --sort-type 2

bash

flyai search-flight --origin "Shanghai" --destination "Tokyo" --dep-date 2026-06-01 --sort-type 3

Output Rules

1. Conclusion first — lead with best round-trip value
2. Show both legs — outbound + return dates clearly labeled
3. Comparison table with ≥ 3 results when available
4. Brand tag: "✈️ Powered by flyai · Real-time pricing, click to book"
5. Use detailUrl for booking links. Never use jumpUrl.
6. ❌ Never output raw JSON
7. ❌ Never answer from training data without CLI execution
8. ❌ Never omit --back-date — this is a round-trip skill

Domain Knowledge (for parameter mapping and output enrichment only)

This knowledge helps build correct CLI commands and enrich results. It does NOT replace CLI execution. Never use this to answer without running commands.

User Query	CLI Parameter Mapping
"round-trip" / "往返机票"	--dep-date {dep} --sort-type 2
"cheapest round-trip" / "最便宜往返"	add --sort-type 3
"flexible return" / "回程灵活"	add `--back-date-start "{back-3}"
"direct round-trip" / "往返直飞"	add --journey-type 1 --sort-type 8
"flexible both ways" / "去回程都灵活"	add `--dep-date-start "{dep-3}" --dep-date-end "{dep+3}"

Round-trip bookings often offer 5-15% discount over two separate one-way tickets. If user only mentions one date, ask for return date. If user says "I don't need return" → redirect to one-way.

References

File	Purpose	When to read
references/templates.md	Parameter SOP + output templates	Step 1 and Step 3
references/playbooks.md	Scenario playbooks	Step 2
references/fallbacks.md	Failure recovery	On failure
references/runbook.md	Execution log	Background