United Flight 4390 Deals & Information (2025/2026)

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United Flight 4390 Route Deals From $92

The cheapest prices found with in the last 7 days for return flights were $137 and $92 for one-way flights to Washington Dulles Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, Sep 11 - Tue, Sep 16
BUF
Buffalo Niagara Intl.
IAD
Washington Dulles Intl.
$137 Roundtrip, found 6 hours ago
$137
Roundtrip
found 6 hours ago
Select United flight, departing Thu, Sep 11 from Buffalo Niagara Intl. to Washington Dulles Intl., returning Tue, Sep 16, priced at $137 found 6 hours ago
Thu, Sep 11 - Tue, Sep 16
BUF
Buffalo Niagara Intl.
IAD
Washington Dulles Intl.
$159 Roundtrip, found 6 hours ago
$159
Roundtrip
found 6 hours ago
Select United flight, departing Thu, Sep 11 from Buffalo Niagara Intl. to Washington Dulles Intl., returning Tue, Sep 16, priced at $159 found 6 hours ago
Thu, Aug 7 - Sun, Aug 10
BUF
Buffalo Niagara Intl.
IAD
Washington Dulles Intl.
$161 Roundtrip, found 19 hours ago
$161
Roundtrip
found 19 hours ago
Select United flight, departing Thu, Aug 7 from Buffalo Niagara Intl. to Washington Dulles Intl., returning Sun, Aug 10, priced at $161 found 19 hours ago
Thu, Sep 11 - Tue, Sep 16
BUF
Buffalo Niagara Intl.
IAD
Washington Dulles Intl.
$172 Roundtrip, found 6 hours ago
$172
Roundtrip
found 6 hours ago
Select United flight, departing Thu, Sep 11 from Buffalo Niagara Intl. to Washington Dulles Intl., returning Tue, Sep 16, priced at $172 found 6 hours ago
Thu, Jul 17 - Mon, Jul 21
BUF
Buffalo Niagara Intl.
IAD
Washington Dulles Intl.
$183 Roundtrip, found 3 days ago
$183
Roundtrip
found 3 days ago
Select United flight, departing Thu, Jul 17 from Buffalo Niagara Intl. to Washington Dulles Intl., returning Mon, Jul 21, priced at $183 found 3 days ago
Thu, Aug 7 - Sun, Aug 10
BUF
Buffalo Niagara Intl.
IAD
Washington Dulles Intl.
$183 Roundtrip, found 19 hours ago
$183
Roundtrip
found 19 hours ago
Select United flight, departing Thu, Aug 7 from Buffalo Niagara Intl. to Washington Dulles Intl., returning Sun, Aug 10, priced at $183 found 19 hours ago
Fri, Jul 4 - Mon, Jul 7
BUF
Buffalo Niagara Intl.
IAD
Washington Dulles Intl.
$188 Roundtrip, found 9 hours ago
$188
Roundtrip
found 9 hours ago
Select United flight, departing Fri, Jul 4 from Buffalo Niagara Intl. to Washington Dulles Intl., returning Mon, Jul 7, priced at $188 found 9 hours ago
Mon, Nov 17 - Wed, Dec 3
BUF
Buffalo Niagara Intl.
IAD
Washington Dulles Intl.
$190 Roundtrip, found 1 day ago
$190
Roundtrip
found 1 day ago
Select United flight, departing Mon, Nov 17 from Buffalo Niagara Intl. to Washington Dulles Intl., returning Wed, Dec 3, priced at $190 found 1 day ago
Thu, Sep 11 - Tue, Sep 16
BUF
Buffalo Niagara Intl.
IAD
Washington Dulles Intl.
$197 Roundtrip, found 6 hours ago
$197
Roundtrip
found 6 hours ago
Select United flight, departing Thu, Sep 11 from Buffalo Niagara Intl. to Washington Dulles Intl., returning Tue, Sep 16, priced at $197 found 6 hours ago
Thu, Aug 7 - Sun, Aug 10
BUF
Buffalo Niagara Intl.
IAD
Washington Dulles Intl.
$198 Roundtrip, found 19 hours ago
$198
Roundtrip
found 19 hours ago
Select United flight, departing Thu, Aug 7 from Buffalo Niagara Intl. to Washington Dulles Intl., returning Sun, Aug 10, priced at $198 found 19 hours ago

Frequently asked questions

What route does flight number UA4390 take?
UA4390 is used on a number of routes. Typically, UA4390 flies directly from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to O'Hare Intl. Airport (ORD). If this is your route, you'll be up above the clouds for about 2 hours and 2 minutes.
What kind of plane is on flight number UA4390?
It's likely you'll be setting off on a Canadair (Bombardier) Regional Jet 550 if you've booked a fare from BWI to Chicago, IL Airport (ORD-O'Hare Intl.), a common route for flight UA4390.
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 UA4390 flight with Travelocity, please visit our Customer Service Portal.