United Flight 378 Deals & Information (2025/2026)

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United Flight 378 Route Deals From $69

The cheapest prices found with in the last 7 days for return flights were $137 and $69 for one-way flights to O'Hare Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Wed, Oct 1 - Mon, Oct 6
BOS
Logan Intl.
ORD
O'Hare Intl.
$137 Roundtrip, found 7 hours ago
$137
Roundtrip
found 7 hours ago
Select United flight, departing Wed, Oct 1 from Logan Intl. to O'Hare Intl., returning Mon, Oct 6, priced at $137 found 7 hours ago
Wed, Oct 1 - Sun, Oct 5
BOS
Logan Intl.
ORD
O'Hare Intl.
$155 Roundtrip, found 7 hours ago
$155
Roundtrip
found 7 hours ago
Select United flight, departing Wed, Oct 1 from Logan Intl. to O'Hare Intl., returning Sun, Oct 5, priced at $155 found 7 hours ago
Mon, Jul 14 - Thu, Jul 17
BOS
Logan Intl.
ORD
O'Hare Intl.
$158 Roundtrip, found 1 hour ago
$158
Roundtrip
found 1 hour ago
Select United flight, departing Mon, Jul 14 from Logan Intl. to O'Hare Intl., returning Thu, Jul 17, priced at $158 found 1 hour ago
Mon, Jul 14 - Thu, Jul 17
BOS
Logan Intl.
ORD
O'Hare Intl.
$160 Roundtrip, found 1 hour ago
$160
Roundtrip
found 1 hour ago
Select United flight, departing Mon, Jul 14 from Logan Intl. to O'Hare Intl., returning Thu, Jul 17, priced at $160 found 1 hour ago
Tue, Sep 9 - Fri, Sep 12
BOS
Logan Intl.
ORD
O'Hare Intl.
$165 Roundtrip, found 2 days ago
$165
Roundtrip
found 2 days ago
Select United flight, departing Tue, Sep 9 from Logan Intl. to O'Hare Intl., returning Fri, Sep 12, priced at $165 found 2 days 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.