Deal Brief
BOS to LIS is currently available as a round-trip redemption for 60,500 points plus $102.93 in taxes. This option prices in Economy through flyingblue+united, with strong seat availability.
Route: Best Round-Trip Deal: Boston to Lisbon
Route code: BOS -> LIS + LIS -> BOS
Program: Flying Blue / United MileagePlus (Mixed)
Airline: Delta Air Lines
Trip style: 4 days
Travel window: Multiple
Available dates:
August 2026 (2) cash price unavailable
- AUG-22 to AUG-26
- AUG-25 to AUG-29
November 2026 (2) cash price unavailable
- NOV-22 to NOV-26
- NOV-27 to DEC-1
December 2026 (2) cash price unavailable
- DEC-8 to DEC-12
- DEC-10 to DEC-14
Cash fares are approximate round-trip prices via Travelpayouts. Point value = (cash fare − taxes) ÷ points. flyingblue+united baseline: 1.3¢/pt.
Additional Deal Information
Data Last Refreshed
Quality Score Breakdown · 72/100
Absolute Cost
28 / 50
Seat Availability
10 / 10
Cabin Tier
0 / 10
Freshness
1 / 1
Destination Tier
0 / 8
Tax Efficiency 12% cash
15 / 18
Airline Product
0 / 7
Additional Flight Information
Outbound · BOS → LIS
Booked via Flying Blue
Airline: Delta Air Lines
Return · LIS → BOS
Booked via United MileagePlus
Mixed booking: This round trip uses two different loyalty programs for the best combined price.
The booking program is where you redeem points. Different programs may price the same flight differently.