Flight Price Comparison

Flight Price Comparison runs the same search on Google Flights, KAYAK, Momondo and Ryanair at once and puts every answer in one dataset — plus a verdict row: which source was cheaper for that route, by how much, and where to book it.

Google Flights and KAYAK run by default; tick Momondo for a different partner mix, and Ryanair for the fares the metasearch engines miss — Ryanair sells direct only, so on European routes it regularly undercuts every engine that does not list it.

You pay only the row price of each source Actor it runs on your account — Google Flights $0.20, KAYAK and Momondo $0.70 per 1,000 rows, Ryanair $0.30 per 1,000 calendar days (it reads the rest of the month from your date). The comparison itself adds nothing on top: no comparison fee, no run fee, no proxy fee. Verdict rows and error rows are free.

Sources matter because they do not agree. Two real searches, both run on 21 September 2026:

Route	Google Flights	KAYAK	Momondo	Ryanair	Gap
DPS–SIN, 15 Mar	$55	$75	—	—	36%
STN–DUB, 15 Mar	€42	€47	€47	€35.99	31%

On the European route the winner is the one no metasearch lists properly. Checking a single source and calling it "the price" is how that money gets left on the table.

What a run returns

One row per itinerary from each source, tagged with where it came from:

Field	Notes
source	google-flights, kayak, momondo or ryanair
price / currency	Both sources priced in the same currency, so the comparison is apples to apples
airline / flightNumbers	Jetstar / ["JQ86"]
stops / layovers[]	Airport and minutes per layover
departAt / arriveAt / durationMinutes	Local times, as each site shows them
seller / sellersForThisFlight	Who sells the ticket — KAYAK names the agency or airline behind the fare
priceLevel / emissionsKg	Google's low / typical / high verdict and CO₂, where the source provides it
bookingUrl / sourceUrl	Straight to the booking, and back to the original search

And one verdict row per route:

{
  "type": "verdict",
  "cheapestBySource": { "google-flights": 55, "kayak": 75 },
  "cheaperSource": "google-flights",
  "gap": 20,
  "gapPercent": 36.4,
  "cheapestOverall": { "source": "google-flights", "price": 55, "airline": "Jetstar", "bookingUrl": "…" }
}

Verdict rows are not charged.

How to run it

1. Enter origin and destination as IATA codes (DPS, JFK, LHR) and a departure date.
2. Add a return date for a round trip, set passengers, cabin and currency.
3. Click Start. Rows from both sources land in one table, cheapest first.

Many routes in one run

{
  "routes": [
    { "origin": "JFK", "destination": "LHR", "departureDate": "2027-03-15", "returnDate": "2027-03-22" },
    { "origin": "DPS", "destination": "SIN", "departureDate": "2027-03-15" }
  ],
  "maxResultsPerSource": 30
}

from apify_client import ApifyClient
client = ApifyClient("<YOUR_API_TOKEN>")
run = client.actor("lergassy/flight-price-comparison").call(run_input={
    "origin": "JFK", "destination": "LHR", "departureDate": "2027-03-15",
    "maxResultsPerSource": 30, "currency": "USD",
})
for row in client.dataset(run["defaultDatasetId"]).iterate_items():
    if row.get("type") == "verdict":
        print("cheaper source:", row["cheaperSource"], row["cheapestBySource"])

What it is good for

• Fare arbitrage: the same seat is priced differently by source and seller — the verdict row finds the gap for you.
• Price monitoring with a sanity check: one source can go stale or lag; two disagreeing is a signal, not noise.
• Travel agencies: quote a client the real floor, not the first number you saw.
• Research and dashboards: source-tagged rows let you measure which metasearch is actually cheaper on your routes over time.

Bulk export: what it costs

Since 25 September 2026 this Actor adds no charge of its own: each source runs as its own Actor on your account and bills only its own rows (Free-plan prices: Google Flights $0.0002, KAYAK and Momondo $0.0007 per row, Ryanair $0.0003 per calendar day). Nothing is charged for runs, proxy, verdict rows or error rows. Totals below are for Google Flights + KAYAK, half the rows from each:

Job	Rows	Cost
One route, both sources, 30 each	60	$0.027
100 routes compared once	6,000	$2.70
20 routes compared daily for a month	36,000	$16.20
Big export	50,000	$22.50

Running the sources yourself means two to four integrations and datasets; here it is one call, one dataset and one row format — the source runs still appear on your account and in your bill. Compute and proxy are included in the row prices.

Inputs

Input	Notes
origin / destination / departureDate / returnDate	IATA codes and ISO dates
sources	Google Flights and KAYAK by default; add Momondo and Ryanair, or drop one to query a single source
adults / children / cabinClass	Up to 9 passengers, any cabin
maxResultsPerSource	Rows collected from each source per route
currency	Both sources priced in it
includeVerdict	The free comparison row, on by default
routes[]	Many routes in one run

Notes and limits

Fares move during the day and differ by point of sale, so a gap measured now is a gap now — schedule the run if you need a trend. A source that fails writes a free error row and the other sources still return, so a run is never all-or-nothing. Every source is a separate Actor run on your account: all four sources plus this Actor use five concurrent runs, the whole Free-plan allowance — if the account is at its limit, the Actor waits and retries that source. Round-trip prices are the total for both directions on both sources.

The Actor reads publicly displayed prices without logging in, bypassing access controls or collecting personal data. Both sites' terms restrict automated access, and the legality of scraping public data depends on your jurisdiction and use.

Need another source?

Open an issue on this Actor's page and say which one — sources get added on request.

Single-source Actors, if that is all you need: Google Flights Scraper · Kayak Flights Scraper · Momondo Flights Scraper · Ryanair Flights Scraper · Flight Price Tracker · Flight Price Calendar