
United Flight AA399 Deals & Information (2025/2026)
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United Flight 399 Route Deals From $60
The cheapest prices found with in the last 7 days for return flights were $119 and $60 for one-way flights to Logan Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.
ORD
O'Hare Intl.
BOS
Logan Intl.
$119 Roundtrip, found 2 hours ago
$119
Roundtrip
found 2 hours ago
ORD
O'Hare Intl.
BOS
Logan Intl.
$119 Roundtrip, just found
$119
Roundtrip
just found
ORD
O'Hare Intl.
BOS
Logan Intl.
$127 Roundtrip, found 12 hours ago
$127
Roundtrip
found 12 hours ago
ORD
O'Hare Intl.
BOS
Logan Intl.
$134 Roundtrip, found 2 hours ago
$134
Roundtrip
found 2 hours ago
ORD
O'Hare Intl.
BOS
Logan Intl.
$135 Roundtrip, just found
$135
Roundtrip
just found
ORD
O'Hare Intl.
BOS
Logan Intl.
$145 Roundtrip, just found
$145
Roundtrip
just found
ORD
O'Hare Intl.
BOS
Logan Intl.
$145 Roundtrip, found 17 hours ago
$145
Roundtrip
found 17 hours ago
ORD
O'Hare Intl.
BOS
Logan Intl.
$152 Roundtrip, just found
$152
Roundtrip
just found
ORD
O'Hare Intl.
BOS
Logan Intl.
$154 Roundtrip, just found
$154
Roundtrip
just found
ORD
O'Hare Intl.
BOS
Logan Intl.
$156 Roundtrip, just found
$156
Roundtrip
just found
ORD
O'Hare Intl.
BOS
Logan Intl.
$159 Roundtrip, found 9 hours ago
$159
Roundtrip
found 9 hours ago