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 1 day ago
$119
Roundtrip
found 1 day ago
Select United flight, departing Sun, Feb 1 from LaGuardia to Washington Dulles Intl., returning Wed, Feb 4, priced at $119 found 1 day ago
Sun, Feb 1 - Wed, Feb 4
LGA
LaGuardia
IAD
Washington Dulles Intl.
$130 Roundtrip, found 1 day ago
$130
Roundtrip
found 1 day ago
Select United flight, departing Sun, Feb 1 from LaGuardia to Washington Dulles Intl., returning Wed, Feb 4, priced at $130 found 1 day ago
Tue, Sep 15 - Sat, Sep 19
LGA
LaGuardia
IAD
Washington Dulles Intl.
$137 Roundtrip, found 6 days ago
$137
Roundtrip
found 6 days ago
Select United flight, departing Tue, Sep 15 from LaGuardia to Washington Dulles Intl., returning Sat, Sep 19, priced at $137 found 6 days ago
Sun, Feb 1 - Mon, Feb 2
LGA
LaGuardia
IAD
Washington Dulles Intl.
$160 Roundtrip, found 1 day ago
$160
Roundtrip
found 1 day ago
Select United flight, departing Sun, Feb 1 from LaGuardia to Washington Dulles Intl., returning Mon, Feb 2, priced at $160 found 1 day ago
Fri, Jan 16 - Fri, Jan 23
LGA
LaGuardia
IAD
Washington Dulles Intl.
$163 Roundtrip, found 6 days ago
$163
Roundtrip
found 6 days ago
Select United flight, departing Fri, Jan 16 from LaGuardia to Washington Dulles Intl., returning Fri, Jan 23, priced at $163 found 6 days ago
Fri, Jan 16 - Fri, Jan 23
LGA
LaGuardia
IAD
Washington Dulles Intl.
$165 Roundtrip, found 6 days ago
$165
Roundtrip
found 6 days ago
Select United flight, departing Fri, Jan 16 from LaGuardia to Washington Dulles Intl., returning Fri, Jan 23, priced at $165 found 6 days ago
Thu, Jan 29 - Fri, Jan 30
LGA
LaGuardia
IAD
Washington Dulles Intl.
$176 Roundtrip, found 4 days ago
$176
Roundtrip
found 4 days ago
Select United flight, departing Thu, Jan 29 from LaGuardia to Washington Dulles Intl., returning Fri, Jan 30, priced at $176 found 4 days ago
Sat, Jan 17 - Sun, Jan 18
LGA
LaGuardia
IAD
Washington Dulles Intl.
$178 Roundtrip, found 5 days ago
$178
Roundtrip
found 5 days ago
Select United flight, departing Sat, Jan 17 from LaGuardia to Washington Dulles Intl., returning Sun, Jan 18, priced at $178 found 5 days ago
Sun, Feb 1 - Wed, Feb 4
LGA
LaGuardia
IAD
Washington Dulles Intl.
$181 Roundtrip, found 1 day ago
$181
Roundtrip
found 1 day ago
Select United flight, departing Sun, Feb 1 from LaGuardia to Washington Dulles Intl., returning Wed, Feb 4, priced at $181 found 1 day ago
Sat, Jan 17 - Tue, Jan 20
LGA
LaGuardia
IAD
Washington Dulles Intl.
$184 Roundtrip, found 1 day ago
$184
Roundtrip
found 1 day ago
Select United flight, departing Sat, Jan 17 from LaGuardia to Washington Dulles Intl., returning Tue, Jan 20, priced at $184 found 1 day 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.