United Flight 3631 Deals & Information (2026/2027)

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United Flight 3631 Route Deals From $54

The cheapest prices found with in the last 7 days for return flights were $119 and $54 for one-way flights to Washington Dulles Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Sun, Feb 1 - Wed, Feb 4
LGA
LaGuardia
IAD
Washington Dulles Intl.
$119 Roundtrip, found 2 days ago
$119
Roundtrip
found 2 days ago
Select United flight, departing Sun, Feb 1 from LaGuardia to Washington Dulles Intl., returning Wed, Feb 4, priced at $119 found 2 days ago
Sun, Feb 1 - Wed, Feb 4
LGA
LaGuardia
IAD
Washington Dulles Intl.
$130 Roundtrip, found 2 days ago
$130
Roundtrip
found 2 days ago
Select United flight, departing Sun, Feb 1 from LaGuardia to Washington Dulles Intl., returning Wed, Feb 4, priced at $130 found 2 days ago
Thu, Feb 5 - Sun, Feb 8
LGA
LaGuardia
IAD
Washington Dulles Intl.
$135 Roundtrip, found 7 hours ago
$135
Roundtrip
found 7 hours ago
Select United flight, departing Thu, Feb 5 from LaGuardia to Washington Dulles Intl., returning Sun, Feb 8, priced at $135 found 7 hours ago
Thu, Feb 5 - Sun, Feb 8
LGA
LaGuardia
IAD
Washington Dulles Intl.
$141 Roundtrip, found 7 hours ago
$141
Roundtrip
found 7 hours ago
Select United flight, departing Thu, Feb 5 from LaGuardia to Washington Dulles Intl., returning Sun, Feb 8, priced at $141 found 7 hours ago
Mon, Feb 9 - Tue, Feb 10
LGA
LaGuardia
IAD
Washington Dulles Intl.
$159 Roundtrip, found 1 day ago
$159
Roundtrip
found 1 day ago
Select United flight, departing Mon, Feb 9 from LaGuardia to Washington Dulles Intl., returning Tue, Feb 10, priced at $159 found 1 day ago
Sun, Feb 1 - Mon, Feb 2
LGA
LaGuardia
IAD
Washington Dulles Intl.
$160 Roundtrip, found 2 days ago
$160
Roundtrip
found 2 days ago
Select United flight, departing Sun, Feb 1 from LaGuardia to Washington Dulles Intl., returning Mon, Feb 2, priced at $160 found 2 days ago
Mon, Feb 9 - Tue, Feb 10
LGA
LaGuardia
IAD
Washington Dulles Intl.
$176 Roundtrip, found 1 day ago
$176
Roundtrip
found 1 day ago
Select United flight, departing Mon, Feb 9 from LaGuardia to Washington Dulles Intl., returning Tue, Feb 10, priced at $176 found 1 day ago
Sat, Jan 17 - Sat, Jan 24
LGA
LaGuardia
IAD
Washington Dulles Intl.
$190 Roundtrip, found 5 days ago
$190
Roundtrip
found 5 days ago
Select United flight, departing Sat, Jan 17 from LaGuardia to Washington Dulles Intl., returning Sat, Jan 24, priced at $190 found 5 days ago
Thu, Feb 5 - Sun, Feb 8
LGA
LaGuardia
IAD
Washington Dulles Intl.
$192 Roundtrip, found 7 hours ago
$192
Roundtrip
found 7 hours ago
Select United flight, departing Thu, Feb 5 from LaGuardia to Washington Dulles Intl., returning Sun, Feb 8, priced at $192 found 7 hours ago
Sun, Feb 1 - Wed, Feb 4
LGA
LaGuardia
IAD
Washington Dulles Intl.
$196 Roundtrip, found 2 days ago
$196
Roundtrip
found 2 days ago
Select United flight, departing Sun, Feb 1 from LaGuardia to Washington Dulles Intl., returning Wed, Feb 4, priced at $196 found 2 days ago

Frequently asked questions

What route does flight number UA3631 take?
UA3631 serves multiple routes, but the most common is between Buffalo Niagara Intl. Airport (BUF) and ORD. If your flight goes direct, you'll arrive in 1 hour and 54 minutes. Multi-stop flights can also operate under this number, as can flights on other routes.
What kind of plane is on flight number UA3631?
If you're booked on flight UA3631 from Buffalo Niagara Intl. Airport (BUF) to O'Hare Intl. Airport (ORD), you'll most likely be on board an Embraer 170. Flight UA3631 serves multiple routes, but this is the busiest.
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 UA3631 flight with Travelocity, please visit our Customer Service Portal.