Update: this popular deal may have sold out. See more deals >

The Ireland-based budget carrier is currently offering discount fares on over 20 transatlantic routes, good for travel throughout February. Round-trip flights are advertised from $649, subject to the following rules:

– Flights must originate in the U.S., not in Europe.

– You can fly February 1 through February 28 (blackout dates apply on individual routes).

– The cheapest fares are available Mondays through Thursdays.

– Round-trip purchase required.

– No advance purchase required.

– Book flights no later than January 10.

Compare cheap flights to Europe here.

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