United Flight 378 Deals & Information (2025/2026)

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United Flight 378 Route Deals From $70

The cheapest prices found with in the last 7 days for return flights were $137 and $70 for one-way flights to O'Hare Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Sep 12 - Sun, Sep 14
BOS
Logan Intl.
ORD
O'Hare Intl.
$137 Roundtrip, just found
$137
Roundtrip
just found
Select United flight, departing Fri, Sep 12 from Logan Intl. to O'Hare Intl., returning Sun, Sep 14, priced at $137 just found
Fri, Sep 12 - Sun, Sep 14
BOS
Logan Intl.
ORD
O'Hare Intl.
$139 Roundtrip, just found
$139
Roundtrip
just found
Select United flight, departing Fri, Sep 12 from Logan Intl. to O'Hare Intl., returning Sun, Sep 14, priced at $139 just found
Fri, Sep 12 - Sun, Sep 14
BOS
Logan Intl.
ORD
O'Hare Intl.
$153 Roundtrip, just found
$153
Roundtrip
just found
Select United flight, departing Fri, Sep 12 from Logan Intl. to O'Hare Intl., returning Sun, Sep 14, priced at $153 just found
Thu, Sep 4 - Fri, Sep 5
BOS
Logan Intl.
ORD
O'Hare Intl.
$155 Roundtrip, found 15 hours ago
$155
Roundtrip
found 15 hours ago
Select United flight, departing Thu, Sep 4 from Logan Intl. to O'Hare Intl., returning Fri, Sep 5, priced at $155 found 15 hours ago
Thu, Aug 21 - Tue, Aug 26
BOS
Logan Intl.
ORD
O'Hare Intl.
$158 Roundtrip, found 2 hours ago
$158
Roundtrip
found 2 hours ago
Select United flight, departing Thu, Aug 21 from Logan Intl. to O'Hare Intl., returning Tue, Aug 26, priced at $158 found 2 hours ago
Fri, Sep 12 - Sun, Sep 14
BOS
Logan Intl.
ORD
O'Hare Intl.
$159 Roundtrip, just found
$159
Roundtrip
just found
Select United flight, departing Fri, Sep 12 from Logan Intl. to O'Hare Intl., returning Sun, Sep 14, priced at $159 just found
Fri, Sep 12 - Sun, Sep 14
BOS
Logan Intl.
ORD
O'Hare Intl.
$164 Roundtrip, just found
$164
Roundtrip
just found
Select United flight, departing Fri, Sep 12 from Logan Intl. to O'Hare Intl., returning Sun, Sep 14, priced at $164 just found
Tue, Sep 9 - Fri, Sep 12
BOS
Logan Intl.
ORD
O'Hare Intl.
$165 Roundtrip, found 1 day ago
$165
Roundtrip
found 1 day ago
Select United flight, departing Tue, Sep 9 from Logan Intl. to O'Hare Intl., returning Fri, Sep 12, priced at $165 found 1 day ago
Tue, Jul 15 - Thu, Jul 24
BOS
Logan Intl.
ORD
O'Hare Intl.
$167 Roundtrip, found 7 hours ago
$167
Roundtrip
found 7 hours ago
Select United flight, departing Tue, Jul 15 from Logan Intl. to O'Hare Intl., returning Thu, Jul 24, priced at $167 found 7 hours ago
Thu, Aug 21 - Tue, Aug 26
BOS
Logan Intl.
ORD
O'Hare Intl.
$170 Roundtrip, found 2 hours ago
$170
Roundtrip
found 2 hours ago
Select United flight, departing Thu, Aug 21 from Logan Intl. to O'Hare Intl., returning Tue, Aug 26, priced at $170 found 2 hours ago

Frequently asked questions

What route does flight number UA378 take?
UA378 travels between IAD and Sacramento Airport and flies direct. This service typically takes 5 hours and 53 minutes.
What kind of plane is on flight number UA378?
The route for UA378 is predominantly Washington Dulles Intl. Airport (IAD) to SMF, and the Boeing 737-900 is the type of plane you'll probably be flying on.
If I am not able to travel due to COVID-19, can I change my flight to a later date?
For more info about changing your UA378 flight with Travelocity, please visit our Customer Service Portal.