Today’s No Frills of the Day goes to Iberia and their economy OW unbundled fares between Barcelona and Boston.
- Fare: Iberia (IB) ANLN0BGK BCN to BOS
- Booking class: A (economy class)
- Price: from 171 € (from 94 € Base Fare + Taxes & Surcharges).
- Day/Time restrictions: for travel on/after 28OCT 18 and on/before 29MAR 19 permitted TUE/FRI/SUN on each transatlantic sector.
- Seasonal restrictions: originating Spain and Canary Islands inbound – permitted 06JAN through 22MAR or 01APR through 15MAY or 26AUG through 16DEC for each transatlantic sector. Originating Spain and Canary Islands outbound – permitted 01JAN through 22MAR or 01APR through 25JUN or 16AUG through 14DEC or 26DEC through 31DEC for each transatlantic sector.
- Flight restrictions: the fare component must be on IB flights 2600 through 2699.
- Advanced reservation/Ticketing restrictions: reservations for all sectors and ticketing must be completed at the same time.
- Minimum stay requirements: do not apply.
- Maximum stay requirements: travel from last stopover must commence no later than 12 months after departure from fare origin.
- Stopovers: no stopovers permitted.
- Transfers: no transfers permitted.
- Blackout dates: do not apply.
- Travel restrictions: do not apply.
- Sales restrictions: tickets must be issued on IB.
- Cancellations: ticket is non-refundable.
- Changes: charge EUR 150.00 for reissue/revalidation.
I was able to find availability from October 2018 to January 2019 using Matrix (although listed for 190 €):
This fare can be booked through Google Flights
Fare construction (can be useful to travel agents):
The following accruals were estimated using wheretocredit calculator for BCN-BOS round trip travel on IB marketed and operated flights without considering any elite status bonuses or ongoing promotions.