
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 $129 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.
$129 Roundtrip, just found
$129
Roundtrip
just found
ORD
O'Hare Intl.
BOS
Logan Intl.
$137 Roundtrip, found 15 hours ago
$137
Roundtrip
found 15 hours ago
ORD
O'Hare Intl.
BOS
Logan Intl.
$143 Roundtrip, just found
$143
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.
$147 Roundtrip, found 4 days ago
$147
Roundtrip
found 4 days ago
ORD
O'Hare Intl.
BOS
Logan Intl.
$154 Roundtrip, found 2 hours ago
$154
Roundtrip
found 2 hours ago
ORD
O'Hare Intl.
BOS
Logan Intl.
$159 Roundtrip, just found
$159
Roundtrip
just found
ORD
O'Hare Intl.
BOS
Logan Intl.
$160 Roundtrip, found 5 hours ago
$160
Roundtrip
found 5 hours ago
ORD
O'Hare Intl.
BOS
Logan Intl.
$162 Roundtrip, found 2 hours ago
$162
Roundtrip
found 2 hours ago
ORD
O'Hare Intl.
BOS
Logan Intl.
$164 Roundtrip, just found
$164
Roundtrip
just found