Find cheap flights with ChatGPT or Claude

How an AI assistant finds you cheap flights

Connected to a2bflight, an AI assistant asks us whenever your question needs a fare and answers with the cheapest fares we have actually seen, on more than two thousand routes as of 26 October 2026. That gives it real, dated prices to work from, where on its own it could only guess or read whatever pages a web search turns up.

The connection is MCP (Model Context Protocol), a common way for AI assistants to reach outside services, a little like adding an app to your phone. Since 23 September 2026, a2bflight has had a public MCP server at https://mcp.a2bflight.com/mcp. It is free, needs no account and no key, and only looks up fares.

You ask the way you would ask a friend: "Find the cheapest flights from Vancouver next month with a2bflight", or "What does New York to Lisbon cost in November?" Your assistant does the looking up and hands you the fares, each dated and each with a link. To browse them yourself, open flights from Vancouver, flights from New York or the cheapest places to go from your city on a2bflight.

What your assistant can look up on a2bflight

Your assistant can look up three things on a2bflight: airports, the cheapest places to go from your city, and one route day by day.

Every fare is for one adult in economy, says whether it is one-way or a round trip, and shows the day we saw it, with a link to the route's page on a2bflight and, for a fare on a given day, a link to the seller's page for that fare. Where we have seen both, you get the one-way first and the round trip beside it.

1. Find the airport. Name a city and your assistant finds its airport codes, or lists the airports near one.
2. The cheapest places to go from your city. Up to twenty routes from one airport or city, or into one destination, cheapest one-way first, each with its cheapest round trip for a stay of 3 to 21 days where we've seen one. You can set a top price, or a month for trips from your city.
3. One route, day by day. For one pair of airports: the cheapest one-way and round trip, the cheapest days to leave, and the cheapest one-way in each month. If a2bflight has not seen a fare on that route yet, it may start looking and say so; ask again a minute later.

Two one-way tickets or one round trip?

On 26 October 2026, on the trips a2bflight measured, two one-way tickets cost less than one round trip about six times in ten, by a median of about 9%. A round trip is one ticket, out and back. Two one-way tickets can be on different airlines and different days, and on some routes they add up to less. Ask your assistant for the fares both ways and it sets the cheapest one-way in each direction beside the cheapest round trip.

We measured how often that pays. On 26 October 2026 we took every route where a2bflight had seen a round trip and a one-way fare in each direction, the same fares your assistant reads: about 200 routes between about 100 pairs of airports, every fare seen in the week before. On about 60 of those routes, the cheapest one-way out and the cheapest one-way back made a trip you could take, home again 3 to 21 days after leaving, the same stays our round trips cover.

On those trips, two one-ways cost less than the round trip about six times in ten, and the median saving was about 9%; half of the savings fell between about 5% and 17%. A handful saved 20% or more, and a few saved 30% or more. On the other four in ten, the round trip was the cheaper ticket. So a saving of 20 to 30% is real on a few routes, but most savings are smaller.

Counted across all of those routes without checking that the days fit together, two one-ways look cheaper on about two in three and save 20% or more on about one in five. That is not a trip you can book: on about half of those routes the cheapest flight back left before the cheapest flight out. Treat the numbers as a guide, not a guarantee, and remember that two one-ways are two separate bookings: changing or cancelling one does not change the other, and each ticket comes with its own rules, bags included.

1. Ask for both directions and the round trip, for example: "With a2bflight, compare two one-way tickets with a round trip from New York to Lisbon in November."
2. Check the days. Two one-ways only count if they are days you would fly and the flight back comes after the flight out; if they are not, ask for that month's fares day by day.
3. Check the sum, or add the two dated fares yourself, then open each fare's link. The seller's page shows today's price, and with two one-ways you book each ticket on its own.

How to add a2bflight to your AI assistant

Adding a2bflight to your AI assistant is free and needs no account. The server address is the same everywhere: https://mcp.a2bflight.com/mcp. On a2bflight's page for AI assistants you'll find a button or a command for each app named below, and the address to copy.

1. Claude: open a2bflight in Claude's connector directory (https://claude.ai/directory/0b17210a-5ae0-462c-8647-d987af5e997e), or use "Add to Claude" on a2bflight's AI page, which opens Claude with a2bflight filled in for you to confirm. It works on every plan; the free plan allows one custom connector.
2. ChatGPT takes three steps by hand. On the web, turn on Developer mode in Settings, create an app with the server address and no authentication, then pick it from the + menu in a chat. It needs a Plus, Pro, Business, Enterprise or Edu plan.
3. Gemini: in the Gemini app, open Settings, then Connected Apps, Custom apps, Add a custom app, and paste the server address. For now that is for personal accounts in the US; anywhere else, Gemini CLI takes one command.
4. VS Code, Cursor and LM Studio: one click on the AI page installs it. Claude Code and Gemini CLI take one command each, printed on the same page.
5. Any other MCP tool: since 2 October 2026 a2bflight has been listed in the official MCP Registry as com.a2bflight/fares, and it is on Glama's list of MCP connectors (https://glama.ai/mcp/connectors/com.a2bflight/fares). A tool that takes a remote MCP server address can use https://mcp.a2bflight.com/mcp.

Booking a fare your assistant found

Every fare your assistant gets from a2bflight shows the day we saw it, and a fare from last week may have moved. Your assistant writes the answer in its own words, so open the fare's link before you book: the seller's page is where you book, and it shows today's price.

There is nothing to sign up for: no account, and a2bflight keeps no address of yours. Fares are for one adult in economy, so for a group or business class what comes back is the one-adult economy fare. Planning a trip with friends from different cities? a2bflight's group search finds each person's own fare to one place, side by side.

Want to try it first, with no setup? Ask AI, the first link in a2bflight's menu, opens our own assistant on the site. It finds the same fares and shows them as cards; to set two one-ways against a round trip, ask the AI you connect, or add the two dated fares yourself.

What you helped change on a2bflight

If you found a2bflight through an AI assistant, thank you: visitors like you started two of its October 2026 changes. Prices in your currency began with visitors from Korea who found us through ChatGPT, and the group search that answers first began with the visitors ChatGPT sent to /meet.

Your assistant gets fares in US dollars. On a2bflight's own pages, since 26 October 2026, prices appear in your currency, and a fare's booking link, from our pages or from your AI, opens the seller's page in your currency wherever the seller offers it. The post on prices in your currency has the details, and what's new on a2bflight has the rest of this autumn's changes.