United Flight 678 Deals & Information (2026/2027)

Wander Wisely with exceptional service, 24/7 supportOpens in a new window

Feel at ease with free flight cancellations within 24 hours of booking

Change your flight without a fee on select flights

United Flight 678 Route Deals From $254

The cheapest prices found with in the last 7 days for return flights were $334 and $254 for one-way flights to George Bush Intercontinental for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Sep 18 - Mon, Sep 21
MFE
Miller Intl.
IAH
George Bush Intercontinental
$334 Roundtrip, found 6 hours ago
$334
Roundtrip
found 6 hours ago
Select United flight, departing Fri, Sep 18 from Miller Intl. to George Bush Intercontinental, returning Mon, Sep 21, priced at $334 found 6 hours ago
Fri, Sep 18 - Mon, Sep 21
MFE
Miller Intl.
IAH
George Bush Intercontinental
$348 Roundtrip, found 6 hours ago
$348
Roundtrip
found 6 hours ago
Select United flight, departing Fri, Sep 18 from Miller Intl. to George Bush Intercontinental, returning Mon, Sep 21, priced at $348 found 6 hours ago
Fri, Sep 18 - Mon, Sep 21
MFE
Miller Intl.
IAH
George Bush Intercontinental
$362 Roundtrip, found 6 hours ago
$362
Roundtrip
found 6 hours ago
Select United flight, departing Fri, Sep 18 from Miller Intl. to George Bush Intercontinental, returning Mon, Sep 21, priced at $362 found 6 hours ago
Fri, Sep 18 - Mon, Sep 21
MFE
Miller Intl.
IAH
George Bush Intercontinental
$397 Roundtrip, found 6 hours ago
$397
Roundtrip
found 6 hours ago
Select United flight, departing Fri, Sep 18 from Miller Intl. to George Bush Intercontinental, returning Mon, Sep 21, priced at $397 found 6 hours ago
Fri, Sep 18 - Mon, Sep 21
MFE
Miller Intl.
IAH
George Bush Intercontinental
$399 Roundtrip, found 6 hours ago
$399
Roundtrip
found 6 hours ago
Select United flight, departing Fri, Sep 18 from Miller Intl. to George Bush Intercontinental, returning Mon, Sep 21, priced at $399 found 6 hours ago
Fri, Sep 18 - Mon, Sep 21
MFE
Miller Intl.
IAH
George Bush Intercontinental
$404 Roundtrip, found 6 hours ago
$404
Roundtrip
found 6 hours ago
Select United flight, departing Fri, Sep 18 from Miller Intl. to George Bush Intercontinental, returning Mon, Sep 21, priced at $404 found 6 hours ago
Fri, Sep 18 - Mon, Sep 21
MFE
Miller Intl.
IAH
George Bush Intercontinental
$411 Roundtrip, found 6 hours ago
$411
Roundtrip
found 6 hours ago
Select United flight, departing Fri, Sep 18 from Miller Intl. to George Bush Intercontinental, returning Mon, Sep 21, priced at $411 found 6 hours ago
Fri, Sep 18 - Mon, Sep 21
MFE
Miller Intl.
IAH
George Bush Intercontinental
$414 Roundtrip, found 6 hours ago
$414
Roundtrip
found 6 hours ago
Select United flight, departing Fri, Sep 18 from Miller Intl. to George Bush Intercontinental, returning Mon, Sep 21, priced at $414 found 6 hours ago
Fri, Sep 18 - Mon, Sep 21
MFE
Miller Intl.
IAH
George Bush Intercontinental
$419 Roundtrip, found 6 hours ago
$419
Roundtrip
found 6 hours ago
Select United flight, departing Fri, Sep 18 from Miller Intl. to George Bush Intercontinental, returning Mon, Sep 21, priced at $419 found 6 hours ago
Fri, Sep 18 - Mon, Sep 21
MFE
Miller Intl.
IAH
George Bush Intercontinental
$433 Roundtrip, found 6 hours ago
$433
Roundtrip
found 6 hours ago
Select United flight, departing Fri, Sep 18 from Miller Intl. to George Bush Intercontinental, returning Mon, Sep 21, priced at $433 found 6 hours ago
Thu, Sep 10 - Sun, Sep 13
MFE
Miller Intl.
IAH
George Bush Intercontinental
$434 Roundtrip, found 8 hours ago
$434
Roundtrip
found 8 hours ago
Select United flight, departing Thu, Sep 10 from Miller Intl. to George Bush Intercontinental, returning Sun, Sep 13, priced at $434 found 8 hours ago
Fri, Sep 18 - Mon, Sep 21
MFE
Miller Intl.
IAH
George Bush Intercontinental
$463 Roundtrip, found 6 hours ago
$463
Roundtrip
found 6 hours ago
Select United flight, departing Fri, Sep 18 from Miller Intl. to George Bush Intercontinental, returning Mon, Sep 21, priced at $463 found 6 hours ago
Thu, Sep 10 - Sun, Sep 13
MFE
Miller Intl.
IAH
George Bush Intercontinental
$465 Roundtrip, found 8 hours ago
$465
Roundtrip
found 8 hours ago
Select United flight, departing Thu, Sep 10 from Miller Intl. to George Bush Intercontinental, returning Sun, Sep 13, priced at $465 found 8 hours ago

Frequently asked questions

What route does flight number UA678 take?
Flight number UA678 operates directly from Washington, DC Airport (IAD-Washington Dulles Intl.) to MIA. During this trip, you'll be in the air for 2 hours and 40 minutes. Consider booking ahead to secure your favorite seat.
What kind of plane is on flight number UA678?
The route for UA678 is generally Washington, DC Airport (IAD-Washington Dulles Intl.) to MIA, and the Airbus A319 is the type of aircraft you'll probably be heading off 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 UA678 flight with Travelocity, please visit our Customer Service Portal.